Merge back preview (#185)

Paged and Split now page like the week and day views; Split keeps its
vertical expand drag, now vertical-only beside the pager, and the pane
follows the grid's row count mid-swipe. The old trigger swipe and slide
transition are gone with their last callers.

Closes #336

CHANGELOG.md

@@ -5,6 +5,19 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+
+### Added
+- **Pages can open the split agenda.** Swipe up from a full month to reveal the compact grid and month agenda; tap a day to filter it, then swipe down to return. The transition gives haptic feedback ([#111]).
+- **Week numbers open their week.** Tap a week number in the month grid to open Week at that row; Back returns to Month ([#197]).
+
+### Changed
+- **Split view opens with the month's agenda.** It starts at today in the current month; tapping a day filters the list, and the filter chip restores the full month. Swiping the list moves by day when filtered and by month otherwise ([#142]).
+- **Today stands out in the month grid.** Its whole cell has a distinct background; tapping Today briefly expands that cell and nudges its neighbours aside ([#241]).
+
+### Fixed
+- **Multi-day events stay above shorter events.** Month and Week bars, Split day lists, and Agenda now place multi-day events before one-day all-day events, then timed events; declined events remain last ([#291]).
+
 ## [2.21.0] — 2026-09-23
 
 ### Added

app/src/main/java/de/jeanlucmakiola/calendula/MainActivity.kt

@@ -32,6 +32,7 @@ import de.jeanlucmakiola.calendula.domain.EventForm
 import de.jeanlucmakiola.calendula.domain.buildInsertEventForm
 import de.jeanlucmakiola.calendula.ui.RootScreen
 import de.jeanlucmakiola.calendula.ui.common.LocalShowHourGrid
+import de.jeanlucmakiola.calendula.ui.common.LocalMultiDayCount
 import de.jeanlucmakiola.calendula.ui.common.LocalTimelineZoom
 import de.jeanlucmakiola.calendula.ui.common.rememberTimelineZoom
 import de.jeanlucmakiola.calendula.ui.common.LocalSoftenColors
@@ -169,6 +170,7 @@ class MainActivity : AppCompatActivity() {
             // weeks and switching between the week and day view.
             val timelineZoom = rememberTimelineZoom(
                 stored = settings.timelineScale,
+                hours = settings.timelineHours,
                 onPersist = settingsViewModel::setTimelineScale,
             )
             val fonts by settingsViewModel.fontState.collectAsStateWithLifecycle()
@@ -188,6 +190,7 @@ class MainActivity : AppCompatActivity() {
                         LocalUse24HourFormat provides use24Hour,
                         LocalShowHourGrid provides settings.showHourGrid,
                         LocalTimelineZoom provides timelineZoom,
+                        LocalMultiDayCount provides settings.multiDayCount,
                         LocalSoftenColors provides settings.softenColors,
                     ) {
                         RootScreen(

app/src/main/java/de/jeanlucmakiola/calendula/data/prefs/SettingsPrefs.kt

@@ -21,6 +21,7 @@ import de.jeanlucmakiola.calendula.ui.agenda.storageValue
 import de.jeanlucmakiola.calendula.ui.common.CalendarView
 import de.jeanlucmakiola.calendula.ui.common.IMPLEMENTED_VIEWS
 import de.jeanlucmakiola.calendula.ui.common.QuickSwitchConfig
+import de.jeanlucmakiola.calendula.ui.common.TimelineHours
 import de.jeanlucmakiola.calendula.ui.common.TimelineScale
 import de.jeanlucmakiola.calendula.ui.common.parseTimelineScale
 import de.jeanlucmakiola.calendula.ui.common.storageValue
@@ -287,6 +288,36 @@ class SettingsPrefs @Inject constructor(
         store.edit { it[TIMELINE_SCALE_KEY] = scale.storageValue() }
     }
 
+    /** How many days the multi-day view shows side by side (#193). */
+    val multiDayCount: Flow<Int> = store.data.map { prefs ->
+        (prefs[MULTI_DAY_COUNT_KEY] ?: DEFAULT_MULTI_DAY_COUNT).coerceIn(MULTI_DAY_COUNTS)
+    }
+
+    suspend fun setMultiDayCount(count: Int) {
+        store.edit { it[MULTI_DAY_COUNT_KEY] = count.coerceIn(MULTI_DAY_COUNTS) }
+    }
+
+    /**
+     * The hours the day, week and multi-day timelines fit to the screen when they
+     * open (#322). Off by default; the hours survive switching it off.
+     */
+    val timelineHours: Flow<TimelineHours> = store.data.map { prefs ->
+        TimelineHours.of(
+            enabled = prefs[TIMELINE_HOURS_ENABLED_KEY] ?: false,
+            startHour = prefs[TIMELINE_HOURS_START_KEY] ?: TimelineHours.DEFAULT_START_HOUR,
+            endHour = prefs[TIMELINE_HOURS_END_KEY] ?: TimelineHours.DEFAULT_END_HOUR,
+        )
+    }
+
+    suspend fun setTimelineHours(hours: TimelineHours) {
+        val valid = TimelineHours.of(hours.enabled, hours.startHour, hours.endHour)
+        store.edit {
+            it[TIMELINE_HOURS_ENABLED_KEY] = valid.enabled
+            it[TIMELINE_HOURS_START_KEY] = valid.startHour
+            it[TIMELINE_HOURS_END_KEY] = valid.endHour
+        }
+    }
+
     /**
      * Where the jump-to-today control lives (issue #60). Default OFF — the
      * historical layout, where it's an extended FAB that fades in above the "+"
@@ -948,10 +979,20 @@ class SettingsPrefs @Inject constructor(
             if (view in config.enabled) view.name else "!${view.name}"
         }
 
-    /** Keep the given order (de-duplicated), then append any views it omits. */
+    /** Keep stored order; insert the new multi-day view after Week on upgrades. */
     private fun completeViewOrder(seen: List<CalendarView>): List<CalendarView> {
-        val ordered = seen.distinct()
+        val ordered = seen.distinct().toMutableList()
-        return ordered + IMPLEMENTED_VIEWS.filterNot { it in ordered }
+        IMPLEMENTED_VIEWS.forEach { view ->
+            if (view !in ordered) {
+                val index = if (view == CalendarView.MultiDay && CalendarView.Week in ordered) {
+                    ordered.indexOf(CalendarView.Week) + 1
+                } else {
+                    ordered.size
+                }
+                ordered.add(index, view)
+            }
+        }
+        return ordered
     }
 
     companion object {
@@ -1017,8 +1058,14 @@ class SettingsPrefs @Inject constructor(
         internal const val DEFAULT_ALLDAY_REMINDER_TIME = 540
         private const val MINUTES_PER_DAY = 1_440
         internal val SNOOZE_MINUTES_KEY = intPreferencesKey("snooze_minutes")
+        internal val MULTI_DAY_COUNT_KEY = intPreferencesKey("multi_day_count")
+        internal val TIMELINE_HOURS_ENABLED_KEY = booleanPreferencesKey("timeline_hours_enabled")
+        internal val TIMELINE_HOURS_START_KEY = intPreferencesKey("timeline_hours_start")
+        internal val TIMELINE_HOURS_END_KEY = intPreferencesKey("timeline_hours_end")
         /** Default snooze delay for the notification "Snooze" action. */
         const val DEFAULT_SNOOZE_MINUTES = 10
+        const val DEFAULT_MULTI_DAY_COUNT = 3
+        val MULTI_DAY_COUNTS = 3..6
         internal val CALENDAR_REMINDER_OVERRIDE_KEY =
             stringPreferencesKey("per_calendar_reminder_override")
         internal val CALENDAR_ALLDAY_REMINDER_OVERRIDE_KEY =

app/src/main/java/de/jeanlucmakiola/calendula/data/reminders/ReminderNotifier.kt

@@ -88,6 +88,7 @@ class ReminderNotifier @Inject constructor(
             is24Hour = is24Hour,
             today = Instant.now().atZone(zone).toLocalDate(),
             firstDayOfWeek = firstDayOfWeek,
+            todayLabel = context.getString(R.string.reminder_day_today),
             tomorrowLabel = context.getString(R.string.reminder_day_tomorrow),
             yesterdayLabel = context.getString(R.string.reminder_day_yesterday),
         )

app/src/main/java/de/jeanlucmakiola/calendula/data/reminders/ReminderTimeText.kt

@@ -27,12 +27,12 @@ import java.util.Locale
  *                                                          alone would be ambiguous)
  * - timed, crossing days: "11 Jun, 23:30 – 12 Jun, 00:30" (medium date + short time,
  *                                                          already unambiguous)
- * - all-day, one day:     "11 Jun 2026"
+ * - all-day, one day:     "Tomorrow" / "Thu" / "11 Jun 2026" (same relative rules,
- * - all-day, multi-day:   "11 Jun 2026 – 12 Jun 2026"
+ *                                                          plus [todayLabel] — no time range to lean on)
+ * - all-day, multi-day:   "Tomorrow – 12 Jun 2026"        (relative start, explicit end)
  *
- * All-day instances already carry an explicit date, so they never gain a
+ * All-day instances store UTC midnights with an exclusive end, so they are read
- * relative prefix. They store UTC midnights with an exclusive end, so they are
+ * in UTC and the end day is the last *covered* day (issue #308).
- * read in UTC and the end day is the last *covered* day.
  */
 fun reminderTimeText(
     beginMillis: Long,
@@ -43,6 +43,7 @@ fun reminderTimeText(
     is24Hour: Boolean,
     today: LocalDate,
     firstDayOfWeek: DayOfWeek,
+    todayLabel: String,
     tomorrowLabel: String,
     yesterdayLabel: String,
 ): String {
@@ -53,11 +54,16 @@ fun reminderTimeText(
         val lastDay = Instant.ofEpochMilli(endMillis).atZone(ZoneOffset.UTC).toLocalDate()
             .minusDays(1)
             .coerceAtLeast(firstDay)
-        return if (lastDay == firstDay) {
+        val start = relativeDayPrefix(
-            dateFormat.format(firstDay)
+            day = firstDay,
-        } else {
+            today = today,
-            dateFormat.format(firstDay) + RANGE + dateFormat.format(lastDay)
+            firstDayOfWeek = firstDayOfWeek,
-        }
+            locale = locale,
+            dateFormat = dateFormat,
+            tomorrowLabel = tomorrowLabel,
+            yesterdayLabel = yesterdayLabel,
+        ) ?: todayLabel
+        return if (lastDay == firstDay) start else start + RANGE + dateFormat.format(lastDay)
     }
 
     val timeFormat = timeOfDayFormatter(is24Hour, locale)

app/src/main/java/de/jeanlucmakiola/calendula/domain/EventDisplayOrder.kt

@@ -0,0 +1,18 @@
+package de.jeanlucmakiola.calendula.domain
+
+import kotlinx.datetime.TimeZone
+
+/** Lower values appear first in lists and get the upper visible lanes in grids. */
+fun EventInstance.displayPriority(zone: TimeZone): Int = when {
+    isDeclined -> 3
+    spansMultipleDays(zone) -> 0
+    isAllDay -> 1
+    else -> 2
+}
+
+/** Shared order for agenda and split day lists. Grid bars add their lane geometry. */
+fun eventDisplayComparator(zone: TimeZone): Comparator<EventInstance> =
+    compareBy<EventInstance> { it.displayPriority(zone) }
+        .thenBy { it.start }
+        .thenBy { it.title }
+        .thenBy { it.instanceId }

app/src/main/java/de/jeanlucmakiola/calendula/ui/CalendarHost.kt

@@ -1,24 +1,40 @@
 package de.jeanlucmakiola.calendula.ui
 
 import androidx.activity.compose.BackHandler
+import androidx.activity.compose.PredictiveBackHandler
 import androidx.compose.animation.AnimatedContent
 import androidx.compose.animation.AnimatedVisibility
+import androidx.compose.animation.ExperimentalSharedTransitionApi
+import androidx.compose.animation.SharedTransitionLayout
+import androidx.compose.animation.core.SeekableTransitionState
+import androidx.compose.animation.core.rememberTransition
 import androidx.compose.animation.fadeIn
-import androidx.compose.animation.fadeOut
 import androidx.compose.animation.slideInHorizontally
-import androidx.compose.animation.slideOutHorizontally
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.padding
+import androidx.compose.material3.DrawerValue
+import androidx.compose.material3.ModalNavigationDrawer
+import androidx.compose.material3.Scaffold
+import androidx.compose.material3.TopAppBarDefaults
+import androidx.compose.material3.rememberDrawerState
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.setValue
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.CompositionLocalProvider
 import androidx.compose.runtime.LaunchedEffect
-import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.mutableIntStateOf
 import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.runtime.saveable.listSaver
 import androidx.compose.runtime.saveable.rememberSaveable
-import androidx.compose.runtime.setValue
 import androidx.compose.ui.Modifier
+import de.jeanlucmakiola.calendula.ui.common.screen
+import de.jeanlucmakiola.calendula.ui.common.ViewScreen
+import androidx.compose.ui.layout.onGloballyPositioned
+import androidx.compose.ui.layout.positionInWindow
+import androidx.compose.ui.platform.LocalDensity
 import androidx.hilt.navigation.compose.hiltViewModel
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import de.jeanlucmakiola.calendula.domain.EventForm
@@ -26,18 +42,38 @@ import de.jeanlucmakiola.calendula.domain.EventInstance
 import de.jeanlucmakiola.calendula.ui.agenda.AgendaScreen
 import de.jeanlucmakiola.calendula.ui.calendars.BackupScreen
 import de.jeanlucmakiola.calendula.ui.calendars.CalendarsScreen
+import de.jeanlucmakiola.calendula.ui.common.BelowTopBarClip
+import de.jeanlucmakiola.calendula.ui.common.StayingPut
+import de.jeanlucmakiola.calendula.ui.common.CalendarDrawer
+import de.jeanlucmakiola.calendula.ui.common.CalendarFab
+import de.jeanlucmakiola.calendula.ui.common.CalendarTopBar
+import de.jeanlucmakiola.calendula.ui.common.ChromeHost
+import de.jeanlucmakiola.calendula.ui.common.ChromeSlot
+import de.jeanlucmakiola.calendula.ui.common.LocalChromeSlot
+import de.jeanlucmakiola.calendula.ui.common.next
 import de.jeanlucmakiola.floret.identity.fadeThrough
+import de.jeanlucmakiola.floret.identity.predictiveBackExit
+import de.jeanlucmakiola.floret.identity.rememberReduceMotion
 import de.jeanlucmakiola.calendula.ui.common.CalendarView
 import de.jeanlucmakiola.calendula.ui.common.EventMoveHost
 import de.jeanlucmakiola.calendula.ui.common.EventMoveScope
 import de.jeanlucmakiola.calendula.ui.common.LocalEventMove
 import de.jeanlucmakiola.calendula.ui.common.LocalManageCalendars
+import de.jeanlucmakiola.calendula.ui.common.LocalTimelineScroll
+import de.jeanlucmakiola.calendula.ui.common.LocalViewFocus
+import de.jeanlucmakiola.calendula.ui.common.ViewFocus
+import de.jeanlucmakiola.calendula.ui.common.ViewFocusSaver
+import de.jeanlucmakiola.calendula.ui.common.LocalViewMorph
 import de.jeanlucmakiola.calendula.ui.common.RescheduleViewModel
+import de.jeanlucmakiola.calendula.ui.common.TimelineScrollMemory
+import de.jeanlucmakiola.calendula.ui.common.ViewMorphScope
+import de.jeanlucmakiola.calendula.ui.common.rememberCalendarFadeSpec
+import de.jeanlucmakiola.calendula.ui.common.rememberViewMorphBoundsTransform
 import de.jeanlucmakiola.calendula.ui.common.drillToDay
+import de.jeanlucmakiola.calendula.ui.common.drillToWeek
 import de.jeanlucmakiola.calendula.ui.common.rememberCalendarSlideSpec
 import de.jeanlucmakiola.calendula.ui.common.selectView
 import de.jeanlucmakiola.calendula.ui.common.viewBaseStack
-import de.jeanlucmakiola.calendula.ui.day.DayScreen
 import de.jeanlucmakiola.calendula.ui.detail.EventDetailScreen
 import de.jeanlucmakiola.calendula.ui.edit.EventEditScreen
 import de.jeanlucmakiola.calendula.ui.edit.ImportSource
@@ -45,16 +81,21 @@ import de.jeanlucmakiola.calendula.ui.imports.ImportScreen
 import de.jeanlucmakiola.calendula.ui.month.MonthScreen
 import de.jeanlucmakiola.calendula.ui.search.SearchScreen
 import de.jeanlucmakiola.calendula.ui.settings.SettingsScreen
-import de.jeanlucmakiola.calendula.ui.week.WeekScreen
+import de.jeanlucmakiola.calendula.ui.week.TimelineScreen
+import kotlinx.coroutines.NonCancellable
+import kotlinx.coroutines.withContext
+import kotlinx.coroutines.launch
 import kotlinx.datetime.LocalDate
 import kotlinx.datetime.TimeZone
 import kotlinx.datetime.toLocalDateTime
+import kotlin.coroutines.cancellation.CancellationException
 import kotlin.time.Clock
 
 /**
  * Holds the top-level view back stack (spec M1) and swaps between the calendar
- * screens. Each screen owns its own ViewModel and date anchor; the view-switcher
+ * screens. Each screen owns its own ViewModel; they all open on the one focused
- * pill in their top bars writes back here via [onSelectView].
+ * date held here ([ViewFocus]), and the view-switcher pill in their top bars
+ * writes back here via [onSelectView].
  *
  * The stack's bottom is the user's [CalendarHostViewModel.defaultView] home view.
  * A lateral switch (pill / drawer) builds a visit history so back retraces it
@@ -71,6 +112,7 @@ import kotlin.time.Clock
  * as [WidgetNavRequest.OpenEvent], which also roots the back stack in the
  * widget's view.)
  */
+@OptIn(ExperimentalSharedTransitionApi::class)
 @Composable
 fun CalendarHost(
     modifier: Modifier = Modifier,
@@ -102,14 +144,25 @@ fun CalendarHost(
     var viewStack by rememberSaveable(stateSaver = viewStackSaver) {
         mutableStateOf(listOf(defaultView))
     }
+    var navigationVersion by remember { mutableIntStateOf(0) }
     val view = viewStack.last()
-    val onSelectView: (CalendarView) -> Unit = { viewStack = viewStack.selectView(it) }
+    // The date every view opens on and carries along (#184); tapping a day
+    // anywhere focuses it and opens the day view there.
+    val focus = rememberSaveable(saver = ViewFocusSaver) { ViewFocus(localToday()) }
 
-    // Tapping a day in the month grid opens the day view anchored to that date.
+    val switchScope = rememberCoroutineScope()
-    var pendingDayIso by rememberSaveable { mutableStateOf<String?>(null) }
+    val switchTo: ((List<CalendarView>) -> List<CalendarView>) -> Unit = { move ->
+        navigationVersion++
+        viewStack = move(viewStack)
+    }
+    val onSelectView: (CalendarView) -> Unit = { target -> switchTo { it.selectView(target) } }
     val onOpenDay: (LocalDate) -> Unit = { date ->
-        pendingDayIso = date.toString()
+        focus.navigateTo(date)
-        viewStack = viewStack.drillToDay()
+        switchTo { it.drillToDay() }
+    }
+    val onOpenWeek: (LocalDate) -> Unit = { date ->
+        focus.navigateTo(date)
+        switchTo { it.drillToWeek() }
     }
 
     // The event-detail screen (S4) is a full-screen destination hoisted here so
@@ -259,13 +312,14 @@ fun CalendarHost(
     // [requestedDetailKey]. Date/event opens root the stack in the widget's own
     // view so backing out returns there (then home), not to the default.
     LaunchedEffect(widgetNavRequest) {
+        if (widgetNavRequest != null) navigationVersion++
         when (val req = widgetNavRequest) {
             is WidgetNavRequest.OpenDate -> {
                 // Drill the day view in over the widget's view: drop any overlay
                 // that would cover it, so the open doesn't land under Settings/form.
                 dismissCoveringOverlays()
                 createDateIso = null
-                pendingDayIso = req.dateIso
+                focus.navigateTo(LocalDate.parse(req.dateIso))
                 // No widget source (an external date tap) roots over the default
                 // home view, so backing out of the day returns home then exits.
                 viewStack = viewBaseStack(defaultView, req.source ?: defaultView).drillToDay()
@@ -289,7 +343,7 @@ fun CalendarHost(
                 // default home — so backing out returns to the default, then exits.
                 dismissCoveringOverlays()
                 createDateIso = null
-                pendingDayIso = null
+                focus.navigateTo(localToday())
                 viewStack = viewBaseStack(defaultView, req.view ?: defaultView)
                 onWidgetNavConsumed()
             }
@@ -340,6 +394,9 @@ fun CalendarHost(
     }
 
     val slideSpec = rememberCalendarSlideSpec()
+    // Overlays leave from the predictive-back preview (#184): shrinking on from
+    // where the gesture let go instead of snapping back and sliding off.
+    val overlayExit = predictiveBackExit()
 
     // Base-level back: pop the view stack while no overlay covers it (each overlay
     // owns its own BackHandler and takes precedence). Disabled at the home view,
@@ -347,76 +404,150 @@ fun CalendarHost(
     val anyOverlayVisible = showSearch || detailKey != null || createDateIso != null ||
         editKey != null || showSettings || showCalendars || showBackup ||
         importUri != null || importForm != null
-    BackHandler(enabled = !anyOverlayVisible && viewStack.size > 1) {
+    // The view switch runs on a seekable transition, so a back gesture can scrub
-        viewStack = viewStack.dropLast(1)
+    // it (#185): the previous view morphs in under the finger, releasing finishes
+    // the pop and cancelling springs back. Reduced motion keeps a plain back.
+    val viewTransition = remember { SeekableTransitionState(view) }
+    LaunchedEffect(view) { viewTransition.animateTo(view) }
+    val reduceMotion = rememberReduceMotion()
+    val viewBackEnabled = !anyOverlayVisible && viewStack.size > 1
+    if (reduceMotion) {
+        BackHandler(enabled = viewBackEnabled) {
+            navigationVersion++
+            viewStack = viewStack.dropLast(1)
+        }
+    } else {
+        PredictiveBackHandler(enabled = viewBackEnabled) { events ->
+            val previous = viewStack[viewStack.size - 2]
+            try {
+                events.collect { viewTransition.seekTo(it.progress, targetState = previous) }
+                navigationVersion++
+                viewStack = viewStack.dropLast(1)
+            } catch (e: CancellationException) {
+                withContext(NonCancellable) { viewTransition.animateTo(viewTransition.currentState) }
+                throw e
+            }
+        }
     }
 
     Box(modifier = modifier.fillMaxSize()) {
-        // Switching between the peer views (month/week/day/agenda) is lateral
+        // Switching between the month, timeline and agenda screens is lateral
         // navigation, so it fades through rather than sliding — paging *within* a
-        // view keeps the directional slide. AnimatedContent keyed on the view type.
+        // view keeps the directional slide. What both views show morphs across
+        // (#184): see [ViewMorphKey]. Reduced motion keeps the plain fade.
         val viewSwitch = fadeThrough()
+        val morphBounds = rememberViewMorphBoundsTransform()
+        val morphFade = rememberCalendarFadeSpec()
+        val morphClip = remember { BelowTopBarClip() }
+        val stayingPut = remember { StayingPut() }
+        val chromeHost = remember { ChromeHost() }
+        val drawerState = rememberDrawerState(DrawerValue.Closed)
+        val density = LocalDensity.current
+        val topBarBottom = TopAppBarDefaults.windowInsets.getTop(density) +
+            with(density) { TopAppBarDefaults.TopAppBarExpandedHeight.toPx() }
+        val timelineScroll = remember { TimelineScrollMemory() }
         CompositionLocalProvider(
             LocalEventMove provides moveScope,
+            LocalTimelineScroll provides timelineScroll,
+            LocalViewFocus provides focus,
             // The failure state's way out when every calendar is switched off
             // (#239); nothing else in the calendar surfaces navigates here.
-            LocalManageCalendars provides { showCalendars = true },
+            LocalManageCalendars provides remember { { showCalendars = true } },
         ) {
-        AnimatedContent(
+        // One drawer, top bar and FAB for every screen (#184): a switch changes
-            targetState = view,
+        // what they say, from what the screen on show publishes, rather than
+        // swapping them for another screen's.
+        ModalNavigationDrawer(
+            drawerState = drawerState,
+            // Open only via the menu button where edge-swipe would fight paging;
+            // the agenda has no paging to fight.
+            gesturesEnabled = drawerState.isOpen || view.screen == ViewScreen.Agenda,
+            drawerContent = {
+                CalendarDrawer(
+                    currentView = view,
+                    currentDate = chromeHost.chrome?.drawerDate ?: focus.date,
+                    drawerState = drawerState,
+                    viewOrder = drawerViewOrder,
+                    onSelectView = { target ->
+                        // Once the drawer is out of the way, so the switch is seen whole.
+                        val requestVersion = ++navigationVersion
+                        switchScope.launch {
+                            drawerState.close()
+                            if (navigationVersion == requestVersion) onSelectView(target)
+                        }
+                    },
+                    onJumpToDate = { target ->
+                        chromeHost.actions?.onJumpToDate?.invoke(target)
+                        switchScope.launch { drawerState.close() }
+                    },
+                    onSettings = {
+                        onOpenSettings()
+                        switchScope.launch { drawerState.close() }
+                    },
+                )
+            },
+        ) {
+        Scaffold(
+            topBar = {
+                CalendarTopBar(
+                    host = chromeHost,
+                    selectedView = view,
+                    quickSwitchViews = quickSwitchViews,
+                    onCycleView = { onSelectView(viewStack.last().next(quickSwitchViews)) },
+                    onOpenDrawer = { switchScope.launch { drawerState.open() } },
+                    onOpenSearch = onOpenSearch,
+                    showTodayButton = todayInToolbar,
+                )
+            },
+            floatingActionButton = { CalendarFab(chromeHost, todayInToolbar) },
+        ) { innerPadding ->
+        SharedTransitionLayout(
+            Modifier
+                .padding(innerPadding)
+                .fillMaxSize()
+.onGloballyPositioned { morphClip.top = topBarBottom - it.positionInWindow().y },
+        ) {
+        // Keyed on the screen, not the view: the day, multi-day and week views
+        // are one timeline that resizes between them itself (#184), so switching
+        // among them must not replay this transition.
+        rememberTransition(viewTransition, label = "view-switch").AnimatedContent(
             transitionSpec = { viewSwitch },
-            label = "view-switch",
+            contentKey = { it.screen },
         ) { currentView ->
-            when (currentView) {
+            val screen = currentView.screen
-                CalendarView.Week -> WeekScreen(
+            val sharedScope = this@SharedTransitionLayout
-                    selectedView = currentView,
+            val visibilityScope = this@AnimatedContent
-                    onSelectView = onSelectView,
+            val viewMorph = remember(reduceMotion, sharedScope, visibilityScope, morphBounds, morphFade, morphClip, stayingPut) {
+                if (reduceMotion) null else ViewMorphScope(sharedScope, visibilityScope, morphBounds, morphFade, morphClip, stayingPut)
+            }
+            CompositionLocalProvider(
+                LocalViewMorph provides viewMorph,
+                LocalChromeSlot provides ChromeSlot(chromeHost, current = screen == view.screen),
+            ) {
+            when (screen) {
+                ViewScreen.Timeline -> TimelineScreen(
+                    view = currentView,
                     onOpenDay = onOpenDay,
                     onEventClick = onEventClick,
-                    onOpenSettings = onOpenSettings,
-                    onOpenSearch = onOpenSearch,
                     onCreateEvent = onCreateEvent,
-                    quickSwitchViews = quickSwitchViews,
-                    drawerViewOrder = drawerViewOrder,
-                    todayInToolbar = todayInToolbar,
                 )
-                CalendarView.Day -> DayScreen(
+                ViewScreen.Month -> MonthScreen(
-                    selectedView = currentView,
+                    onOpenDay = onOpenDay,
-                    onSelectView = onSelectView,
+                    onOpenWeek = onOpenWeek,
                     onEventClick = onEventClick,
-                    onOpenSettings = onOpenSettings,
-                    onOpenSearch = onOpenSearch,
                     onCreateEvent = onCreateEvent,
-                    initialDateIso = pendingDayIso,
-                    quickSwitchViews = quickSwitchViews,
-                    drawerViewOrder = drawerViewOrder,
-                    todayInToolbar = todayInToolbar,
                 )
-                CalendarView.Month -> MonthScreen(
+                ViewScreen.Agenda -> AgendaScreen(
-                    selectedView = currentView,
-                    onSelectView = onSelectView,
                     onOpenDay = onOpenDay,
                     onEventClick = onEventClick,
-                    onOpenSettings = onOpenSettings,
-                    onOpenSearch = onOpenSearch,
                     onCreateEvent = onCreateEvent,
                     quickSwitchViews = quickSwitchViews,
-                    drawerViewOrder = drawerViewOrder,
-                    todayInToolbar = todayInToolbar,
-                )
-                CalendarView.Agenda -> AgendaScreen(
-                    selectedView = currentView,
-                    onSelectView = onSelectView,
-                    onOpenDay = onOpenDay,
-                    onEventClick = onEventClick,
-                    onOpenSettings = onOpenSettings,
-                    onOpenSearch = onOpenSearch,
-                    onCreateEvent = onCreateEvent,
-                    quickSwitchViews = quickSwitchViews,
-                    drawerViewOrder = drawerViewOrder,
-                    todayInToolbar = todayInToolbar,
                 )
             }
+            }
+        }
+        }
+        }
         }
         }
 
@@ -429,11 +560,12 @@ fun CalendarHost(
         AnimatedVisibility(
             visible = showSearch,
             enter = slideInHorizontally(slideSpec) { it } + fadeIn(),
-            exit = slideOutHorizontally(slideSpec) { it } + fadeOut(),
+            exit = overlayExit,
         ) {
             SearchScreen(
                 onBack = { showSearch = false },
                 onEventClick = onEventClick,
+                visible = showSearch,
             )
         }
 
@@ -442,7 +574,7 @@ fun CalendarHost(
         AnimatedVisibility(
             visible = detailKey != null,
             enter = slideInHorizontally(slideSpec) { it } + fadeIn(),
-            exit = slideOutHorizontally(slideSpec) { it } + fadeOut(),
+            exit = overlayExit,
         ) {
             activeKey?.let { key ->
                 EventDetailScreen(
@@ -462,6 +594,7 @@ fun CalendarHost(
                         importForm = form
                         detailKey = null
                     },
+                    visible = detailKey != null,
                 )
             }
         }
@@ -470,7 +603,7 @@ fun CalendarHost(
         AnimatedVisibility(
             visible = createDateIso != null,
             enter = slideInHorizontally(slideSpec) { it } + fadeIn(),
-            exit = slideOutHorizontally(slideSpec) { it } + fadeOut(),
+            exit = overlayExit,
         ) {
             (createDateIso ?: heldCreateIso)?.let { iso ->
                 EventEditScreen(
@@ -479,6 +612,7 @@ fun CalendarHost(
                     onClose = { createDateIso = null },
                     onSaved = { createDateIso = null },
                     onManageCalendars = { showCalendars = true },
+                    visible = createDateIso != null,
                 )
             }
         }
@@ -487,7 +621,7 @@ fun CalendarHost(
         AnimatedVisibility(
             visible = editKey != null,
             enter = slideInHorizontally(slideSpec) { it } + fadeIn(),
-            exit = slideOutHorizontally(slideSpec) { it } + fadeOut(),
+            exit = overlayExit,
         ) {
             (editKey ?: heldEditKey)?.let { key ->
                 EventEditScreen(
@@ -499,6 +633,7 @@ fun CalendarHost(
                         detailKey = null
                     },
                     onManageCalendars = { showCalendars = true },
+                    visible = editKey != null,
                 )
             }
         }
@@ -507,12 +642,13 @@ fun CalendarHost(
         AnimatedVisibility(
             visible = showSettings,
             enter = slideInHorizontally(slideSpec) { it } + fadeIn(),
-            exit = slideOutHorizontally(slideSpec) { it } + fadeOut(),
+            exit = overlayExit,
         ) {
             SettingsScreen(
                 onBack = { showSettings = false },
                 onManageCalendars = { showCalendars = true },
                 onOpenBackup = { showBackup = true },
+                visible = showSettings,
             )
         }
 
@@ -564,11 +700,12 @@ fun CalendarHost(
         AnimatedVisibility(
             visible = showCalendars,
             enter = slideInHorizontally(slideSpec) { it } + fadeIn(),
-            exit = slideOutHorizontally(slideSpec) { it } + fadeOut(),
+            exit = overlayExit,
         ) {
             CalendarsScreen(
                 onBack = { showCalendars = false },
                 onOpenBackup = { showBackup = true },
+                visible = showCalendars,
             )
         }
 
@@ -576,7 +713,7 @@ fun CalendarHost(
         AnimatedVisibility(
             visible = showBackup,
             enter = slideInHorizontally(slideSpec) { it } + fadeIn(),
-            exit = slideOutHorizontally(slideSpec) { it } + fadeOut(),
+            exit = overlayExit,
         ) {
             // Settings can open this screen without the manager underneath, so
             // its failure states' "Manage calendars" way out has to open the
@@ -603,6 +740,7 @@ fun CalendarHost(
                         showBackup = false
                         showCalendars = false
                     },
+                    visible = showBackup,
                 )
             }
         }
@@ -614,3 +752,6 @@ private val viewStackSaver = listSaver<List<CalendarView>, Int>(
     save = { stack -> stack.map(CalendarView::ordinal) },
     restore = { ordinals -> ordinals.map { CalendarView.entries[it] } },
 )
+
+private fun localToday(): LocalDate =
+    Clock.System.now().toLocalDateTime(TimeZone.currentSystemDefault()).date

app/src/main/java/de/jeanlucmakiola/calendula/ui/agenda/AgendaScreen.kt

@@ -1,5 +1,18 @@
 package de.jeanlucmakiola.calendula.ui.agenda
 
+import de.jeanlucmakiola.calendula.ui.common.PublishChrome
+import de.jeanlucmakiola.calendula.ui.common.ScreenActions
+import de.jeanlucmakiola.calendula.ui.common.ScreenBody
+import de.jeanlucmakiola.calendula.ui.common.ScreenChrome
+import de.jeanlucmakiola.calendula.ui.common.LocalViewFocus
+import de.jeanlucmakiola.calendula.ui.common.EnterOnFocus
+import kotlinx.coroutines.flow.drop
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.setValue
+import androidx.compose.runtime.snapshotFlow
+import androidx.compose.runtime.rememberUpdatedState
+import de.jeanlucmakiola.calendula.ui.common.ViewMorphKey
+import de.jeanlucmakiola.calendula.ui.common.morphEvent
 import androidx.compose.foundation.ExperimentalFoundationApi
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
@@ -18,34 +31,22 @@ import androidx.compose.foundation.lazy.itemsIndexed
 import androidx.compose.foundation.lazy.rememberLazyListState
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.Coffee
-import androidx.compose.material.icons.filled.Menu
-import androidx.compose.material.icons.filled.Search
 import androidx.compose.material3.ButtonDefaults
-import androidx.compose.material3.DrawerValue
 import androidx.compose.material3.FilledTonalButton
 import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.Icon
-import androidx.compose.material3.IconButton
 import androidx.compose.material3.MaterialTheme
-import androidx.compose.material3.ModalNavigationDrawer
-import androidx.compose.material3.Scaffold
 import androidx.compose.material3.Text
-import androidx.compose.material3.TopAppBar
-import androidx.compose.material3.TopAppBarDefaults
-import androidx.compose.material3.rememberDrawerState
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.derivedStateOf
-import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.rememberCoroutineScope
-import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.style.TextAlign
-import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
 import androidx.hilt.navigation.compose.hiltViewModel
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
@@ -58,14 +59,9 @@ import de.jeanlucmakiola.calendula.ui.common.AppBarSpacing
 import de.jeanlucmakiola.calendula.ui.common.QuickSwitchConfig
 import de.jeanlucmakiola.calendula.ui.common.agendaRangeLabel
 import de.jeanlucmakiola.floret.identity.animateItemMotion
-import de.jeanlucmakiola.calendula.ui.common.CalendarDrawer
-import de.jeanlucmakiola.calendula.ui.common.CalendarFabColumn
-import de.jeanlucmakiola.calendula.ui.common.TodayAction
 import de.jeanlucmakiola.calendula.ui.common.CalendarFailure
 import de.jeanlucmakiola.calendula.ui.common.CalendarView
 import de.jeanlucmakiola.calendula.ui.common.IMPLEMENTED_VIEWS
-import de.jeanlucmakiola.calendula.ui.common.ViewSwitcherPill
-import de.jeanlucmakiola.calendula.ui.common.next
 import de.jeanlucmakiola.floret.components.positionOf
 import de.jeanlucmakiola.calendula.ui.common.rememberCurrentMinute
 import de.jeanlucmakiola.floret.locale.currentLocale
@@ -81,26 +77,22 @@ import kotlin.time.Instant
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable
 fun AgendaScreen(
-    selectedView: CalendarView,
-    onSelectView: (CalendarView) -> Unit,
     onOpenDay: (LocalDate) -> Unit,
     onEventClick: (EventInstance) -> Unit,
-    onOpenSettings: () -> Unit,
-    onOpenSearch: () -> Unit,
     onCreateEvent: (LocalDate, Int?) -> Unit,
     quickSwitchViews: List<CalendarView> = IMPLEMENTED_VIEWS,
-    drawerViewOrder: List<CalendarView> = IMPLEMENTED_VIEWS,
-    todayInToolbar: Boolean = false,
     modifier: Modifier = Modifier,
     viewModel: AgendaViewModel = hiltViewModel(),
 ) {
+    // Opens on the focused date and hands back the day scrolled to the top.
+    val focus = LocalViewFocus.current
+    EnterOnFocus(viewModel) { if (it != viewModel.anchor.value) viewModel.goToDate(it) }
     val state by viewModel.state.collectAsStateWithLifecycle()
     val anchor by viewModel.anchor.collectAsStateWithLifecycle()
     val pastDisplay by viewModel.pastEventDisplay.collectAsStateWithLifecycle()
     val showToday by viewModel.showToday.collectAsStateWithLifecycle()
     val weekStart by viewModel.weekStart.collectAsStateWithLifecycle()
 
-    val drawerState = rememberDrawerState(DrawerValue.Closed)
     val scope = rememberCoroutineScope()
     var showRangePicker by remember { mutableStateOf(false) }
 
@@ -124,112 +116,88 @@ fun AgendaScreen(
     // requested: scrolling before the new rows compose leaves the list keyed to
     // a row that reappears further down, and it follows it there.
     LaunchedEffect(successState?.anchor) { listState.scrollToItem(0) }
-    val jumpToToday = {
+    val jumpToToday: () -> Unit = {
         // Off today, moving the anchor is what resets the list (above); on today
         // the window doesn't change, so the scroll back is the whole action.
         if (isOnToday) scope.launch { listState.animateScrollToItem(0) }
         viewModel.goToToday()
+        (state as? AgendaUiState.Success)?.today?.let { focus?.date = it }
     }
 
-    ModalNavigationDrawer(
+    PublishChrome(
-        drawerState = drawerState,
+        ScreenChrome(
-        drawerContent = {
+            title = stringResource(R.string.view_agenda),
-            CalendarDrawer(
+            titleDate = null,
-                currentView = selectedView,
+            drawerDate = anchor,
-                currentDate = anchor,
+            awayFromToday = !isOnToday || (scrolledAway && successState != null),
-                drawerState = drawerState,
+            todayText = stringResource(R.string.agenda_today_action),
-                viewOrder = drawerViewOrder,
+        ),
-                onSelectView = { view ->
+        ScreenActions(
-                    onSelectView(view)
+            onToday = jumpToToday,
-                    scope.launch { drawerState.close() }
+            onJumpToDate = { target ->
-                },
+                focus?.date = target
-                onJumpToDate = { target ->
+                viewModel.goToDate(target)
-                    viewModel.goToDate(target)
-                    scope.launch { drawerState.close() }
-                },
-                onSettings = {
-                    onOpenSettings()
-                    scope.launch { drawerState.close() }
-                },
-            )
-        },
-    ) {
-        Scaffold(
-            modifier = modifier,
-            topBar = {
-                AgendaTopBar(
-                    selectedView = selectedView,
-                    onCycleView = { onSelectView(selectedView.next(quickSwitchViews)) },
-                    quickSwitchViews = quickSwitchViews,
-                    onOpenDrawer = { scope.launch { drawerState.open() } },
-                    onOpenSearch = onOpenSearch,
-                    showTodayButton = todayInToolbar,
-                    onToday = jumpToToday,
-                )
             },
-            floatingActionButton = {
+            onCreate = { onCreateEvent(anchor, null) },
-                CalendarFabColumn(
+        ),
-                    todayVisible = (!isOnToday || (scrolledAway && successState != null)) &&
+    )
-                        !todayInToolbar,
+
-                    todayText = stringResource(R.string.agenda_today_action),
+    ScreenBody(modifier = modifier) { innerPadding ->
-                    onToday = jumpToToday,
+        Column(
-                    onCreate = { onCreateEvent(anchor, null) },
+            modifier = Modifier
-                )
+                .fillMaxSize()
-            },
+                .padding(innerPadding),
-        ) { innerPadding ->
+        ) {
-            Column(
+            // One bar at the top: the "showing …" header on the left and the
-                modifier = Modifier
+            // session range switcher on the right (one settings toggle).
-                    .fillMaxSize()
+            successState?.takeIf { it.showRangeBar }?.let { s ->
-                    .padding(innerPadding),
+                // end lines the selector up with whatever ends the top bar:
-            ) {
+                // the view switcher's background, or — once #150 hides it —
-                // One bar at the top: the "showing …" header on the left and the
+                // the search icon's glyph.
-                // session range switcher on the right (one settings toggle).
+                val selectorEnd = if (quickSwitchViews.size >= QuickSwitchConfig.MIN_CYCLE) {
-                successState?.takeIf { it.showRangeBar }?.let { s ->
+                    AppBarSpacing.Inset
-                    // end lines the selector up with whatever ends the top bar:
+                } else {
-                    // the view switcher's background, or — once #150 hides it —
+                    AppBarSpacing.IconTrailingInset
-                    // the search icon's glyph.
-                    val selectorEnd = if (quickSwitchViews.size >= QuickSwitchConfig.MIN_CYCLE) {
-                        AppBarSpacing.Inset
-                    } else {
-                        AppBarSpacing.IconTrailingInset
-                    }
-                    Row(
-                        verticalAlignment = Alignment.CenterVertically,
-                        modifier = Modifier
-                            .fillMaxWidth()
-                            .padding(
-                                start = RANGE_BAR_TEXT_INSET,
-                                end = selectorEnd,
-                                top = 8.dp,
-                                bottom = 8.dp,
-                            ),
-                    ) {
-                        AgendaRangeBanner(
-                            range = s.range,
-                            start = s.anchor,
-                            end = s.rangeEnd,
-                            modifier = Modifier.weight(1f),
-                        )
-                        AgendaRangePill(
-                            range = s.range,
-                            isOverride = s.rangeIsOverride,
-                            onClick = { showRangePicker = true },
-                        )
-                    }
                 }
-                AgendaContent(
+                Row(
-                    state = state,
+                    verticalAlignment = Alignment.CenterVertically,
-                    pastDisplay = pastDisplay,
-                    showToday = showToday,
-                    listState = listState,
-                    onRetry = viewModel::goToToday,
-                    onEventClick = onEventClick,
-                    onOpenDay = onOpenDay,
                     modifier = Modifier
-                        .weight(1f)
+                        .fillMaxWidth()
-                        .fillMaxWidth(),
+                        .padding(
-                )
+                            start = RANGE_BAR_TEXT_INSET,
+                            end = selectorEnd,
+                            top = 8.dp,
+                            bottom = 8.dp,
+                        ),
+                ) {
+                    AgendaRangeBanner(
+                        range = s.range,
+                        start = s.anchor,
+                        end = s.rangeEnd,
+                        modifier = Modifier.weight(1f),
+                    )
+                    AgendaRangePill(
+                        range = s.range,
+                        isOverride = s.rangeIsOverride,
+                        onClick = { showRangePicker = true },
+                    )
+                }
             }
+            AgendaContent(
+                state = state,
+                pastDisplay = pastDisplay,
+                showToday = showToday,
+                listState = listState,
+                onRetry = viewModel::goToToday,
+                onEventClick = onEventClick,
+                onOpenDay = onOpenDay,
+                onTopDay = if (successState?.anchor == anchor) {
+                    { focus?.date = it }
+                } else null,
+                modifier = Modifier
+                    .weight(1f)
+                    .fillMaxWidth(),
+            )
         }
     }
 
@@ -326,6 +294,7 @@ internal fun AgendaContent(
     onOpenDay: (LocalDate) -> Unit,
     modifier: Modifier = Modifier,
     listState: LazyListState = rememberLazyListState(),
+    onTopDay: ((LocalDate) -> Unit)? = null,
 ) {
     when (state) {
         AgendaUiState.Loading -> Box(modifier)
@@ -368,6 +337,7 @@ internal fun AgendaContent(
                     now = now,
                     onEventClick = onEventClick,
                     onOpenDay = onOpenDay,
+                    onTopDay = onTopDay,
                     modifier = modifier,
                 )
             }
@@ -386,8 +356,20 @@ private fun AgendaList(
     now: Instant,
     onEventClick: (EventInstance) -> Unit,
     onOpenDay: (LocalDate) -> Unit,
+    onTopDay: ((LocalDate) -> Unit)?,
     modifier: Modifier = Modifier,
 ) {
+    if (onTopDay != null) {
+        val itemDates by rememberUpdatedState(agendaItemDates(days))
+        val currentOnTopDay by rememberUpdatedState(onTopDay)
+        // The day the list opened on is where the view already is; only a
+        // scroll moves it on.
+        LaunchedEffect(listState) {
+            snapshotFlow { listState.firstVisibleItemIndex }
+                .drop(1)
+                .collect { index -> itemDates.getOrNull(index)?.let(currentOnTopDay) }
+        }
+    }
     LazyColumn(
         modifier = modifier,
         state = listState,
@@ -420,7 +402,7 @@ private fun AgendaList(
                         zone = zone,
                         position = positionOf(index, day.events.size),
                         dimmed = dimPast && event.hasEnded(now),
-                        modifier = animateItemMotion(),
+                        modifier = animateItemMotion().morphEvent(ViewMorphKey.event(event, day.date)),
                         onClick = { onEventClick(event) },
                     )
                 }
@@ -430,6 +412,13 @@ private fun AgendaList(
     }
 }
 
+/** The day of each item [AgendaList] lays out for [days], in its order. */
+internal fun agendaItemDates(days: List<AgendaDay>): List<LocalDate> =
+    days.flatMap { day ->
+        // Header, the placeholder or the events, then the gap.
+        List(2 + day.events.size.coerceAtLeast(1)) { day.date }
+    }
+
 @Composable
 private fun AgendaEmpty(modifier: Modifier = Modifier) {
     Column(
@@ -451,58 +440,3 @@ private fun AgendaEmpty(modifier: Modifier = Modifier) {
         )
     }
 }
-
-@OptIn(ExperimentalMaterial3Api::class)
-@Composable
-private fun AgendaTopBar(
-    selectedView: CalendarView,
-    onCycleView: () -> Unit,
-    quickSwitchViews: List<CalendarView>,
-    onOpenDrawer: () -> Unit,
-    onOpenSearch: () -> Unit,
-    showTodayButton: Boolean,
-    onToday: () -> Unit,
-) {
-    TopAppBar(
-        title = {
-            // A plain label rather than a CalendarTitleButton, so it takes that
-            // one's inset and one-line clamp itself.
-            Text(
-                text = stringResource(R.string.view_agenda),
-                style = MaterialTheme.typography.titleLarge,
-                maxLines = 1,
-                overflow = TextOverflow.Ellipsis,
-                modifier = Modifier.padding(start = AppBarSpacing.TitleInset),
-            )
-        },
-        navigationIcon = {
-            IconButton(onClick = onOpenDrawer) {
-                Icon(
-                    imageVector = Icons.Default.Menu,
-                    contentDescription = stringResource(R.string.month_open_menu),
-                )
-            }
-        },
-        actions = {
-            TodayAction(show = showTodayButton, onToday = onToday)
-            IconButton(onClick = onOpenSearch) {
-                Icon(
-                    imageVector = Icons.Default.Search,
-                    contentDescription = stringResource(R.string.search_action),
-                )
-            }
-            ViewSwitcherPill(
-                current = selectedView,
-                cycle = quickSwitchViews,
-                onCycle = onCycleView,
-            )
-        },
-        // Deliberately flat: M3 lifts the bar to mark content scrolling under
-        // it, but here the bar meets the header on the same surface and the
-        // tint is what makes that seam look like a separate block (#186).
-        colors = TopAppBarDefaults.topAppBarColors(
-            containerColor = MaterialTheme.colorScheme.surface,
-            scrolledContainerColor = MaterialTheme.colorScheme.surface,
-        ),
-    )
-}

app/src/main/java/de/jeanlucmakiola/calendula/ui/agenda/AgendaUiState.kt

@@ -1,6 +1,7 @@
 package de.jeanlucmakiola.calendula.ui.agenda
 
 import de.jeanlucmakiola.calendula.domain.EventInstance
+import de.jeanlucmakiola.calendula.domain.eventDisplayComparator
 import de.jeanlucmakiola.calendula.domain.FailureReason
 import de.jeanlucmakiola.calendula.domain.spanFirstDay
 import de.jeanlucmakiola.calendula.domain.spanLastDay
@@ -86,11 +87,7 @@ fun groupAgendaDays(
     return byDay.map { (date, dayEvents) ->
         AgendaDay(
             date = date,
-            events = dayEvents.sortedWith(
+            events = dayEvents.sortedWith(eventDisplayComparator(zone)),
-                compareByDescending<EventInstance> { it.isAllDay }
-                    .thenBy { it.start }
-                    .thenBy { it.title },
-            ),
         )
     }
 }

app/src/main/java/de/jeanlucmakiola/calendula/ui/calendars/BackupScreen.kt

@@ -82,6 +82,7 @@ private val RESTORE_MIME_TYPES = arrayOf(
 fun BackupScreen(
     onBack: () -> Unit,
     onImport: (Uri) -> Unit,
+    visible: Boolean = true,
     viewModel: CalendarsViewModel = hiltViewModel(),
 ) {
     val state by viewModel.backupState.collectAsStateWithLifecycle()
@@ -137,6 +138,7 @@ fun BackupScreen(
         scrollable = state is BackupUiState.Ready,
         snackbarHost = { SnackbarHost(snackbarHostState) },
         predictiveBack = true,
+        visible = visible,
     ) {
         when (val s = state) {
             BackupUiState.Loading -> BackupLoading()

app/src/main/java/de/jeanlucmakiola/calendula/ui/calendars/CalendarsScreen.kt

@@ -133,6 +133,7 @@ private const val NEW_CALENDAR_ID = Long.MIN_VALUE
 fun CalendarsScreen(
     onBack: () -> Unit,
     onOpenBackup: () -> Unit,
+    visible: Boolean = true,
     viewModel: CalendarsViewModel = hiltViewModel(),
 ) {
     val calendars by viewModel.calendars.collectAsStateWithLifecycle()
@@ -177,6 +178,7 @@ fun CalendarsScreen(
             onConsumeError = viewModel::consumeError,
             onOpenBackup = onOpenBackup,
             onBack = onBack,
+            visible = visible,
             onAdd = { editorSession++; editorId = NEW_CALENDAR_ID },
             onEdit = { calendar -> editorSession++; editorId = calendar.id },
             onSetVisible = viewModel::setCalendarVisible,
@@ -193,6 +195,7 @@ private fun CalendarsList(
     onConsumeError: () -> Unit,
     onOpenBackup: () -> Unit,
     onBack: () -> Unit,
+    visible: Boolean,
     onAdd: () -> Unit,
     onEdit: (CalendarSource) -> Unit,
     onSetVisible: (Long, Boolean) -> Unit,
@@ -218,6 +221,7 @@ private fun CalendarsList(
         onBack = onBack,
         snackbarHost = { SnackbarHost(snackbarHostState) },
         predictiveBack = true,
+        visible = visible,
     ) {
         // What the per-calendar / per-account switches below actually do.
         HintText(stringResource(R.string.calendars_visibility_hint))

app/src/main/java/de/jeanlucmakiola/calendula/ui/common/BlockPlacement.kt

@@ -3,6 +3,7 @@ package de.jeanlucmakiola.calendula.ui.common
 import androidx.compose.animation.Crossfade
 import androidx.compose.animation.core.FiniteAnimationSpec
 import androidx.compose.animation.core.animateDpAsState
+import androidx.compose.animation.core.animateFloatAsState
 import androidx.compose.animation.core.snap
 import androidx.compose.material3.ExperimentalMaterial3ExpressiveApi
 import androidx.compose.material3.MaterialTheme
@@ -13,15 +14,19 @@ import androidx.compose.runtime.getValue
 import androidx.compose.runtime.remember
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.layout.Layout
+import androidx.compose.ui.layout.ParentDataModifier
 import androidx.compose.ui.platform.LocalDensity
 import androidx.compose.ui.text.TextStyle
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.rememberTextMeasurer
 import androidx.compose.ui.text.style.TextDecoration
 import androidx.compose.ui.unit.Constraints
+import androidx.compose.ui.unit.Density
 import androidx.compose.ui.unit.Dp
 import androidx.compose.ui.unit.dp
 import de.jeanlucmakiola.floret.identity.rememberReduceMotion
+import kotlin.math.roundToInt
 
 /** Gap a timed block leaves to its neighbours in the column. */
 val BLOCK_OUTER_INSET = 1.dp
@@ -224,9 +229,13 @@ fun BlockTimeLabel(
     }
 }
 
-/** Where a timed block sits in its column, after tweening. */
+/**
+ * Where a timed block sits in its column, after tweening: across as shares of
+ * the column's width, so a column resizing carries its blocks with it (#184),
+ * down in the timeline's own units.
+ */
 @Immutable
-data class BlockPlacement(val x: Dp, val y: Dp, val width: Dp, val height: Dp)
+data class BlockPlacement(val xFraction: Float, val widthFraction: Float, val y: Dp, val height: Dp)
 
 /**
  * A timed block's placement, tweened rather than jumped. Continuity comes from
@@ -239,17 +248,49 @@ data class BlockPlacement(val x: Dp, val y: Dp, val width: Dp, val height: Dp)
  */
 @OptIn(ExperimentalMaterial3ExpressiveApi::class)
 @Composable
-fun animatedBlockPlacement(x: Dp, y: Dp, width: Dp, height: Dp): BlockPlacement {
+fun animatedBlockPlacement(xFraction: Float, widthFraction: Float, y: Dp, height: Dp): BlockPlacement {
-    val spec: FiniteAnimationSpec<Dp> = if (rememberReduceMotion() ||
+    val still = rememberReduceMotion() || LocalTimelineZoom.current.isPinching
-        LocalTimelineZoom.current.isPinching
+    val dpSpec: FiniteAnimationSpec<Dp> = if (still) snap() else MaterialTheme.motionScheme.fastSpatialSpec()
-    ) {
+    val shareSpec: FiniteAnimationSpec<Float> = if (still) snap() else MaterialTheme.motionScheme.fastSpatialSpec()
-        snap()
+    val animatedX by animateFloatAsState(xFraction, shareSpec, label = "block-x")
-    } else {
+    val animatedWidth by animateFloatAsState(widthFraction, shareSpec, label = "block-width")
-        MaterialTheme.motionScheme.fastSpatialSpec()
+    val animatedY by animateDpAsState(y, dpSpec, label = "block-y")
+    val animatedHeight by animateDpAsState(height, dpSpec, label = "block-height")
+    return BlockPlacement(animatedX, animatedWidth, animatedY, animatedHeight)
+}
+
+/** Seats a block across its [placement]'s share of a [LaneColumn]. */
+fun Modifier.laneSlot(placement: BlockPlacement): Modifier =
+    then(LaneSlot(placement.xFraction, placement.widthFraction))
+
+private data class LaneSlot(val x: Float, val width: Float) : ParentDataModifier {
+    override fun Density.modifyParentData(parentData: Any?): Any = this@LaneSlot
+}
+
+/**
+ * A day column's blocks, each measured across the share of the column its
+ * [laneSlot] gives it; anything else fills the column. The shares are applied
+ * at layout time, so the column can change width every frame without its
+ * blocks recomposing.
+ */
+@Composable
+fun LaneColumn(modifier: Modifier = Modifier, content: @Composable () -> Unit) {
+    Layout(content = content, modifier = modifier) { measurables, constraints ->
+        val width = constraints.maxWidth
+        val loose = constraints.copy(minWidth = 0, minHeight = 0)
+        val placed = measurables.map { measurable ->
+            val slot = measurable.parentData as? LaneSlot
+            if (slot == null) {
+                measurable.measure(loose) to 0
+            } else {
+                val left = (slot.x * width).roundToInt()
+                val right = ((slot.x + slot.width) * width).roundToInt()
+                val laneWidth = (right - left).coerceAtLeast(0)
+                measurable.measure(loose.copy(minWidth = laneWidth, maxWidth = laneWidth)) to left
+            }
+        }
+        layout(width, constraints.maxHeight) {
+            placed.forEach { (placeable, x) -> placeable.placeRelative(x, 0) }
+        }
     }
-    val animatedX by animateDpAsState(x, spec, label = "block-x")
-    val animatedY by animateDpAsState(y, spec, label = "block-y")
-    val animatedWidth by animateDpAsState(width, spec, label = "block-width")
-    val animatedHeight by animateDpAsState(height, spec, label = "block-height")
-    return BlockPlacement(animatedX, animatedY, animatedWidth, animatedHeight)
 }

app/src/main/java/de/jeanlucmakiola/calendula/ui/common/CalendarChrome.kt

@@ -0,0 +1,161 @@
+package de.jeanlucmakiola.calendula.ui.common
+
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.PaddingValues
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.Menu
+import androidx.compose.material.icons.filled.Search
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.TopAppBar
+import androidx.compose.material3.TopAppBarDefaults
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.setValue
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.Immutable
+import androidx.compose.runtime.SideEffect
+import androidx.compose.runtime.Stable
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.staticCompositionLocalOf
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.res.stringResource
+import de.jeanlucmakiola.calendula.R
+import kotlinx.datetime.LocalDate
+
+/**
+ * What a calendar screen shows in the top bar, the FAB and the drawer, which the
+ * host draws once for all of them (#184): switching screens changes what they
+ * say rather than swapping one bar for another.
+ *
+ * @param titleDate the date the title's picker opens on, or null for a title
+ *   that is only a label.
+ * @param drawerDate the date the drawer's picker opens on.
+ * @param awayFromToday whether "today" is worth offering.
+ */
+@Immutable
+data class ScreenChrome(
+    val title: String,
+    val shortTitle: String = title,
+    val titleDate: LocalDate?,
+    val drawerDate: LocalDate,
+    val awayFromToday: Boolean,
+    val todayText: String,
+)
+
+/** What the chrome does for the screen on show; read when used, so not observed. */
+class ScreenActions(
+    val onToday: () -> Unit,
+    val onJumpToDate: (LocalDate) -> Unit,
+    val onCreate: () -> Unit,
+)
+
+/** The screen on show's [ScreenChrome] and [ScreenActions], for the host to draw. */
+@Stable
+class ChromeHost {
+    var chrome by mutableStateOf<ScreenChrome?>(null)
+        private set
+
+    var actions: ScreenActions? = null
+        private set
+
+    internal fun publish(chrome: ScreenChrome, actions: ScreenActions) {
+        this.chrome = chrome
+        this.actions = actions
+    }
+}
+
+/** The host's chrome, and whether the screen reading it is the one on show rather than one leaving. */
+class ChromeSlot(val host: ChromeHost, val current: Boolean)
+
+val LocalChromeSlot = staticCompositionLocalOf<ChromeSlot?> { null }
+
+/** Hands [chrome] and [actions] to the host, while this screen is the one on show. */
+@Composable
+fun PublishChrome(chrome: ScreenChrome, actions: ScreenActions) {
+    val slot = LocalChromeSlot.current ?: return
+    if (slot.current) SideEffect { slot.host.publish(chrome, actions) }
+}
+
+/** The top bar every calendar screen shares. */
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun CalendarTopBar(
+    host: ChromeHost,
+    selectedView: CalendarView,
+    quickSwitchViews: List<CalendarView>,
+    onCycleView: () -> Unit,
+    onOpenDrawer: () -> Unit,
+    onOpenSearch: () -> Unit,
+    showTodayButton: Boolean,
+) {
+    val chrome = host.chrome
+    TopAppBar(
+        title = {
+            if (chrome != null) {
+                CalendarTitleButton(
+                    title = chrome.title,
+                    currentDate = chrome.titleDate,
+                    onJumpToDate = { host.actions?.onJumpToDate?.invoke(it) },
+                    shortTitle = chrome.shortTitle,
+                )
+            }
+        },
+        navigationIcon = {
+            IconButton(onClick = onOpenDrawer) {
+                Icon(
+                    imageVector = Icons.Default.Menu,
+                    contentDescription = stringResource(R.string.month_open_menu),
+                )
+            }
+        },
+        actions = {
+            TodayAction(show = showTodayButton, onToday = { host.actions?.onToday?.invoke() })
+            IconButton(onClick = onOpenSearch) {
+                Icon(
+                    imageVector = Icons.Default.Search,
+                    contentDescription = stringResource(R.string.search_action),
+                )
+            }
+            ViewSwitcherPill(
+                current = selectedView,
+                cycle = quickSwitchViews,
+                onCycle = onCycleView,
+            )
+        },
+        // Deliberately flat: M3 lifts the bar to mark content scrolling under
+        // it, but here the bar meets the header on the same surface and the
+        // tint is what makes that seam look like a separate block (#186).
+        colors = TopAppBarDefaults.topAppBarColors(
+            containerColor = MaterialTheme.colorScheme.surface,
+            scrolledContainerColor = MaterialTheme.colorScheme.surface,
+        ),
+    )
+}
+
+/** The FAB column every calendar screen shares. */
+@Composable
+fun CalendarFab(host: ChromeHost, todayInToolbar: Boolean) {
+    val chrome = host.chrome ?: return
+    CalendarFabColumn(
+        todayVisible = chrome.awayFromToday && !todayInToolbar,
+        todayText = chrome.todayText,
+        onToday = { host.actions?.onToday?.invoke() },
+        onCreate = { host.actions?.onCreate?.invoke() },
+    )
+}
+
+/**
+ * A calendar screen's body under the shared chrome, on the ground the screen's
+ * own Scaffold used to give it; the host's Scaffold has already made room for
+ * the bars, so [content] gets no padding of its own.
+ */
+@Composable
+fun ScreenBody(modifier: Modifier = Modifier, content: @Composable (PaddingValues) -> Unit) {
+    Box(modifier.fillMaxSize().background(MaterialTheme.colorScheme.background)) {
+        content(PaddingValues())
+    }
+}

app/src/main/java/de/jeanlucmakiola/calendula/ui/common/CalendarDrawer.kt

@@ -91,7 +91,7 @@ fun CalendarDrawer(
             DrawerSectionHeader(stringResource(R.string.view_section))
             viewOrder.forEachIndexed { index, view ->
                 GroupedRow(
-                    title = stringResource(view.labelRes),
+                    title = view.label(),
                     position = positionOf(index, viewOrder.size),
                     selected = view == currentView,
                     minHeight = 56.dp,

app/src/main/java/de/jeanlucmakiola/calendula/ui/common/CalendarPager.kt

@@ -0,0 +1,57 @@
+package de.jeanlucmakiola.calendula.ui.common
+
+import androidx.compose.animation.core.Animatable
+import androidx.compose.animation.core.FiniteAnimationSpec
+import androidx.compose.animation.core.VectorConverter
+import androidx.compose.foundation.pager.PagerState
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.derivedStateOf
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberUpdatedState
+import androidx.compose.runtime.snapshotFlow
+import androidx.compose.ui.unit.Dp
+import androidx.compose.ui.unit.lerp
+import kotlinx.coroutines.flow.collectLatest
+import kotlin.math.floor
+
+/**
+ * One height for every page of something that varies from page to page — the
+ * timelines' all-day strip, the split grid's rows — blended between the two
+ * pages a swipe sits between, so what sits below it moves with the finger rather
+ * than jumping on settle. It follows the swipe directly and only springs when a
+ * page's own height changes at rest. [fallback] stands in until the pages have
+ * reported theirs, so it doesn't open from zero.
+ *
+ * @param heights each composed page's own height, by page index.
+ */
+@Composable
+fun pagedHeight(pagerState: PagerState, heights: Map<Int, Dp>, fallback: Dp): Dp {
+    val currentFallback by rememberUpdatedState(fallback)
+    val target by remember(pagerState, heights) {
+        derivedStateOf {
+            val position = pagerState.currentPage + pagerState.currentPageOffsetFraction
+            val from = floor(position).toInt()
+            val a = heights[from]
+            val b = heights[from + 1]
+            lerp(a ?: b ?: currentFallback, b ?: a ?: currentFallback, position - from)
+        }
+    }
+    val height = remember { Animatable(target, Dp.VectorConverter) }
+    LaunchedEffect(height) {
+        snapshotFlow { target to pagerState.isScrollInProgress }.collectLatest { (h, scrolling) ->
+            if (scrolling) height.snapTo(h) else height.animateTo(h)
+        }
+    }
+    return height.value
+}
+
+/** A deliberate jump (Today, jump-to-date): animated, or snapped under reduced motion. */
+suspend fun PagerState.jumpToPage(
+    page: Int,
+    reduceMotion: Boolean,
+    spec: FiniteAnimationSpec<Float>,
+) {
+    if (reduceMotion) scrollToPage(page) else animateScrollToPage(page, animationSpec = spec)
+}

app/src/main/java/de/jeanlucmakiola/calendula/ui/common/CalendarSwipe.kt

@@ -1,79 +0,0 @@
-package de.jeanlucmakiola.calendula.ui.common
-
-import androidx.compose.foundation.gestures.detectHorizontalDragGestures
-import androidx.compose.runtime.Composable
-import androidx.compose.ui.Modifier
-import androidx.compose.ui.input.pointer.pointerInput
-import androidx.compose.ui.platform.LocalDensity
-import androidx.compose.ui.unit.dp
-
-/**
- * Drag distance that turns a calendar page, shared by the month, week and day
- * views so all three answer a swipe at the same point.
- *
- * It was 6dp once, which is inside the distance a tap wanders: brushing the grid
- * changed the month, and a page that turns on an unintended gesture reads as the
- * animation misfiring rather than as the gesture being over-eager.
- */
-val CALENDAR_SWIPE_THRESHOLD = 24.dp
-
-/**
- * The whole-page horizontal swipe: one page per gesture, committed **the moment
- * the drag clears [CALENDAR_SWIPE_THRESHOLD]** rather than when the finger lifts.
- *
- * Waiting for the lift meant the page sat still under a finger that had already
- * travelled far enough to ask for it, and the answer only arrived once you let
- * go — which reads as the view being slow rather than as a deliberate commit.
- * Firing on the threshold is what makes the gesture feel like it is being
- * followed. The trade is that a drag can no longer be taken back by dragging the
- * other way; in practice, once you have moved 24dp deliberately you meant it, and
- * the page you land on is one swipe back.
- *
- * Deliberately **horizontal-only**. The week and day timelines scroll vertically
- * underneath this, and a two-dimensional detector here would claim those drags
- * before the inner scroll ever saw them. As it is, a horizontal drag crosses this
- * detector's slop while a vertical one is consumed below, and the two coexist.
- * (The month view's split style needs a vertical axis as well, so it keeps its
- * own axis-locking detector rather than using this.)
- */
-@Composable
-fun rememberCalendarPageSwipe(
-    onSwipeNext: () -> Unit,
-    onSwipePrev: () -> Unit,
-): Modifier {
-    val threshold = with(LocalDensity.current) { CALENDAR_SWIPE_THRESHOLD.toPx() }
-    return Modifier.pointerInput(onSwipeNext, onSwipePrev) {
-        var accum = 0f
-        // One page per gesture: without this a long drag would keep re-firing
-        // every time the accumulator crossed the threshold again.
-        var fired = false
-        detectHorizontalDragGestures(
-            onDragStart = {
-                accum = 0f
-                fired = false
-            },
-            onDragEnd = {
-                accum = 0f
-                fired = false
-            },
-            onDragCancel = {
-                accum = 0f
-                fired = false
-            },
-            onHorizontalDrag = { _, drag ->
-                accum += drag
-                if (!fired) {
-                    val commit = when {
-                        accum < -threshold -> onSwipeNext
-                        accum > threshold -> onSwipePrev
-                        else -> null
-                    }
-                    if (commit != null) {
-                        fired = true
-                        commit()
-                    }
-                }
-            },
-        )
-    }
-}

app/src/main/java/de/jeanlucmakiola/calendula/ui/common/CalendarTitleButton.kt

@@ -1,5 +1,13 @@
 package de.jeanlucmakiola.calendula.ui.common
 
+import androidx.compose.animation.AnimatedContent
+import androidx.compose.animation.AnimatedVisibility
+import androidx.compose.animation.expandHorizontally
+import androidx.compose.animation.shrinkHorizontally
+import androidx.compose.animation.SizeTransform
+import androidx.compose.animation.fadeIn
+import androidx.compose.animation.fadeOut
+import androidx.compose.animation.togetherWith
 import androidx.compose.foundation.clickable
 import androidx.compose.foundation.layout.BoxWithConstraints
 import androidx.compose.foundation.layout.Row
@@ -10,12 +18,12 @@ import androidx.compose.material.icons.filled.ArrowDropDown
 import androidx.compose.material3.Icon
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Text
-import androidx.compose.runtime.Composable
 import androidx.compose.runtime.getValue
+import androidx.compose.runtime.setValue
+import androidx.compose.runtime.Composable
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.saveable.rememberSaveable
-import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
@@ -33,7 +41,8 @@ import kotlinx.datetime.LocalDate
  * drawer uses and reporting the chosen day through [onJumpToDate].
  *
  * [currentDate] seeds the picker with whatever the bar is currently naming (the
- * visible day, week start or month anchor).
+ * visible day, week start or month anchor); null makes the title a plain label,
+ * as the agenda's is, and the caret folds away.
  *
  * [shortTitle] replaces [title] when the full one does not fit the width the app
  * bar hands the title slot (#165). Either way the line clamps to one and
@@ -42,7 +51,7 @@ import kotlinx.datetime.LocalDate
 @Composable
 fun CalendarTitleButton(
     title: String,
-    currentDate: LocalDate,
+    currentDate: LocalDate?,
     onJumpToDate: (LocalDate) -> Unit,
     modifier: Modifier = Modifier,
     shortTitle: String = title,
@@ -54,6 +63,7 @@ fun CalendarTitleButton(
             .heightIn(min = 48.dp)
             .clip(MaterialTheme.shapes.large)
             .clickable(
+                enabled = currentDate != null,
                 onClickLabel = stringResource(R.string.drawer_jump_to_date),
                 role = Role.Button,
             ) { showDatePicker = true }
@@ -71,21 +81,38 @@ fun CalendarTitleButton(
                     availableWidth = constraints.maxWidth,
                 )
             }
-            Text(
+            // Cross-fades, so switching views or paging turns the title over
-                text = shown,
+            // rather than snapping it (#184).
-                style = style,
+            val fadeSpec = rememberCalendarFadeSpec()
-                maxLines = 1,
+            AnimatedContent(
-                overflow = TextOverflow.Ellipsis,
+                targetState = shown,
+                transitionSpec = {
+                    (fadeIn(fadeSpec) togetherWith fadeOut(fadeSpec)).using(SizeTransform(clip = false))
+                },
+                contentAlignment = Alignment.CenterStart,
+            ) { text ->
+                Text(
+                    text = text,
+                    style = style,
+                    maxLines = 1,
+                    overflow = TextOverflow.Ellipsis,
+                )
+            }
+        }
+        AnimatedVisibility(
+            visible = currentDate != null,
+            enter = fadeIn(rememberCalendarFadeSpec()) + expandHorizontally(),
+            exit = fadeOut(rememberCalendarFadeSpec()) + shrinkHorizontally(),
+        ) {
+            Icon(
+                imageVector = Icons.Default.ArrowDropDown,
+                contentDescription = null,
+                tint = MaterialTheme.colorScheme.onSurfaceVariant,
             )
         }
-        Icon(
-            imageVector = Icons.Default.ArrowDropDown,
-            contentDescription = null,
-            tint = MaterialTheme.colorScheme.onSurfaceVariant,
-        )
     }
 
-    if (showDatePicker) {
+    if (showDatePicker && currentDate != null) {
         CalendarDatePickerDialog(
             initial = currentDate,
             onConfirm = {

app/src/main/java/de/jeanlucmakiola/calendula/ui/common/CalendarTransitions.kt

@@ -1,13 +1,7 @@
 package de.jeanlucmakiola.calendula.ui.common
 
-import androidx.compose.animation.ContentTransform
-import androidx.compose.animation.SizeTransform
 import androidx.compose.animation.core.FiniteAnimationSpec
-import androidx.compose.animation.fadeIn
+import androidx.compose.animation.core.spring
-import androidx.compose.animation.fadeOut
-import androidx.compose.animation.slideInHorizontally
-import androidx.compose.animation.slideOutHorizontally
-import androidx.compose.animation.togetherWith
 import androidx.compose.material3.ExperimentalMaterial3ExpressiveApi
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.runtime.Composable
@@ -19,12 +13,12 @@ import androidx.compose.ui.unit.IntOffset
  * the reduce-motion check — now live in floret-kit's identity module
  * (`expandEnter`, `collapseExit`, `itemEnter`, `animateItemMotion`,
  * `fadeThrough`, `Modifier.predictiveBack`, `rememberReduceMotion`). What stays
- * here is only what's specific to paging the calendar grid: the directional
+ * here is only what's specific to paging the calendar grid: the specs its
- * month/week/day slide and the specs that feed it.
+ * pagers settle with, and that the view switch reuses.
  */
 
 /**
- * The M3 Expressive spatial spring used for the month/week/day slide: the
+ * The M3 Expressive spatial spring the calendar's motion is built on: the
  * *default* spring-physics spec from the active motion scheme, rather than a
  * fixed easing curve.
  *
@@ -40,6 +34,12 @@ import androidx.compose.ui.unit.IntOffset
 fun rememberCalendarSlideSpec(): FiniteAnimationSpec<IntOffset> =
     MaterialTheme.motionScheme.defaultSpatialSpec()
 
+/** The same spring as [rememberCalendarSlideSpec], for a pager settling onto its page. */
+@OptIn(ExperimentalMaterial3ExpressiveApi::class)
+@Composable
+fun rememberCalendarPageSpec(): FiniteAnimationSpec<Float> =
+    MaterialTheme.motionScheme.defaultSpatialSpec()
+
 /**
  * The effects spec from the active motion scheme, for the opacity half of the
  * transition. Captured in composable scope alongside [rememberCalendarSlideSpec]
@@ -55,50 +55,17 @@ fun rememberCalendarFadeSpec(): FiniteAnimationSpec<Float> =
     MaterialTheme.motionScheme.defaultEffectsSpec()
 
 /**
- * Navigating between adjacent months/weeks/days, as M3's shared-axis X: the
+ * A switch between views (#184): the default spatial spring, a little softer, as
- * outgoing page slides and fades one way while the incoming one arrives from the
+ * the whole screen reshapes rather than a page sliding by; softer still when
- * other, position on a spring and opacity on an easing curve.
+ * [long], for a change the eye has further to follow.
- *
- * @param slideDir     +1 = forward (incoming from the right), -1 = back, 0 = jump
- *                     (e.g. "today"); a jump reuses the forward direction.
- * @param spec         spatial animation spec, typically [rememberCalendarSlideSpec].
- * @param fadeSpec     effects spec for the opacity half, and for the whole
- *                     transition under reduced motion; typically
- *                     [rememberCalendarFadeSpec].
- * @param reduceMotion when true, drop the movement and cross-fade alone.
  */
-fun calendarSlideTransition(
+@Composable
-    slideDir: Int,
+fun <T> rememberViewSwitchSpec(long: Boolean = false): FiniteAnimationSpec<T> =
-    spec: FiniteAnimationSpec<IntOffset>,
+    spring(
-    fadeSpec: FiniteAnimationSpec<Float>,
+        dampingRatio = VIEW_SWITCH_DAMPING,
-    reduceMotion: Boolean,
+        stiffness = if (long) LONG_VIEW_SWITCH_STIFFNESS else VIEW_SWITCH_STIFFNESS,
-): ContentTransform {
-    if (reduceMotion) {
-        return fadeIn(fadeSpec).togetherWith(fadeOut(fadeSpec))
-    }
-    val dir = if (slideDir == 0) 1 else slideDir
-    return ContentTransform(
-        targetContentEnter =
-            slideInHorizontally(spec) { w -> dir * w / SLIDE_TRAVEL_DIVISOR } + fadeIn(fadeSpec),
-        initialContentExit =
-            slideOutHorizontally(spec) { w -> -dir * w / SLIDE_TRAVEL_DIVISOR } + fadeOut(fadeSpec),
-        // AnimatedContent clips to the animating container by default, which
-        // shears the pages against the viewport edge as they pass. Left off even
-        // where the two pages differ in height — the split grid stands as many
-        // rows as its month spans (#162) — since a page sliding out over the row
-        // below it reads as travel, and the shear reads as a fault.
-        sizeTransform = SizeTransform(clip = false),
     )
-}
 
-/**
+private const val VIEW_SWITCH_DAMPING = 0.9f
- * How far a page travels, as a fraction of the container width.
+private const val VIEW_SWITCH_STIFFNESS = 450f
- *
+private const val LONG_VIEW_SWITCH_STIFFNESS = 340f
- * A full width was the obvious reading of "paging", but the two pages are
- * stacked and both opaque, so a full-width slide showed one grid racing across
- * another — the movement carried the whole transition and had a long way to go.
- * Under M3's shared-axis pattern the offset only has to *hint* the direction
- * while the cross-fade does the swapping, so a fifth of the width is plenty and
- * leaves nothing skating past.
- */
-private const val SLIDE_TRAVEL_DIVISOR = 5

app/src/main/java/de/jeanlucmakiola/calendula/ui/common/CalendarView.kt

@@ -1,37 +1,53 @@
 package de.jeanlucmakiola.calendula.ui.common
 
-import androidx.annotation.StringRes
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.CalendarViewDay
 import androidx.compose.material.icons.filled.CalendarViewMonth
 import androidx.compose.material.icons.filled.CalendarViewWeek
 import androidx.compose.material.icons.filled.ViewAgenda
+import androidx.compose.material.icons.filled.ViewColumn
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.staticCompositionLocalOf
 import androidx.compose.ui.graphics.vector.ImageVector
+import androidx.compose.ui.res.pluralStringResource
+import androidx.compose.ui.res.stringResource
 import de.jeanlucmakiola.calendula.R
+import de.jeanlucmakiola.calendula.data.prefs.SettingsPrefs
 
 /** The top-level calendar views the user can switch between (spec M1). */
 enum class CalendarView {
     Month,
     Week,
+    MultiDay,
     Day,
     Agenda,
 }
 
-/** Switcher label, shared by the top-bar pill and the drawer's View section. */
+/** How many days the multi-day view shows (#193), provided once at the app root. */
-@get:StringRes
+val LocalMultiDayCount = staticCompositionLocalOf { SettingsPrefs.DEFAULT_MULTI_DAY_COUNT }
-val CalendarView.labelRes: Int
+
-    get() = when (this) {
+/**
-        CalendarView.Month -> R.string.view_month
+ * The view's name, shared by the top-bar pill, the drawer and Settings. The
-        CalendarView.Week -> R.string.view_week
+ * multi-day view is named after its day count ("3 days").
-        CalendarView.Day -> R.string.view_day
+ */
-        CalendarView.Agenda -> R.string.view_agenda
+@Composable
+fun CalendarView.label(): String = when (this) {
+    CalendarView.Month -> stringResource(R.string.view_month)
+    CalendarView.Week -> stringResource(R.string.view_week)
+    CalendarView.MultiDay -> {
+        val count = LocalMultiDayCount.current
+        pluralStringResource(R.plurals.view_multi_day, count, count)
     }
+    CalendarView.Day -> stringResource(R.string.view_day)
+    CalendarView.Agenda -> stringResource(R.string.view_agenda)
+}
 
 /** Leading icon for the view in the drawer's View section. */
 val CalendarView.icon: ImageVector
     get() = when (this) {
         CalendarView.Month -> Icons.Filled.CalendarViewMonth
         CalendarView.Week -> Icons.Filled.CalendarViewWeek
+        CalendarView.MultiDay -> Icons.Filled.ViewColumn
         CalendarView.Day -> Icons.Filled.CalendarViewDay
         CalendarView.Agenda -> Icons.Filled.ViewAgenda
     }
@@ -41,7 +57,13 @@ val CalendarView.icon: ImageVector
  * through these in order.
  */
 val IMPLEMENTED_VIEWS: List<CalendarView> =
-    listOf(CalendarView.Month, CalendarView.Week, CalendarView.Day, CalendarView.Agenda)
+    listOf(
+        CalendarView.Month,
+        CalendarView.Week,
+        CalendarView.MultiDay,
+        CalendarView.Day,
+        CalendarView.Agenda,
+    )
 
 /** Next view in [available], wrapping around. Falls back to Month if absent. */
 fun CalendarView.next(available: List<CalendarView> = IMPLEMENTED_VIEWS): CalendarView {
@@ -107,3 +129,16 @@ fun viewBaseStack(default: CalendarView, source: CalendarView): List<CalendarVie
 /** Push the day view as a drill-in over the current stack (no-op if already on it). */
 fun List<CalendarView>.drillToDay(): List<CalendarView> =
     if (lastOrNull() == CalendarView.Day) this else this + CalendarView.Day
+
+/** The screens the views are drawn by: the day, multi-day and week views share one timeline (#184). */
+enum class ViewScreen { Month, Timeline, Agenda }
+
+val CalendarView.screen: ViewScreen
+    get() = when (this) {
+        CalendarView.Month -> ViewScreen.Month
+        CalendarView.Agenda -> ViewScreen.Agenda
+        CalendarView.Week, CalendarView.MultiDay, CalendarView.Day -> ViewScreen.Timeline
+    }
+/** Push the week view over the month after a week-number tap. */
+fun List<CalendarView>.drillToWeek(): List<CalendarView> =
+    if (lastOrNull() == CalendarView.Week) this else this + CalendarView.Week

app/src/main/java/de/jeanlucmakiola/calendula/ui/common/HourGrid.kt

@@ -59,7 +59,11 @@ internal fun hourCellRadiusPx(cellHeight: Float, cellWidth: Float, maxRadius: Fl
  * coordinate space and keep spanning cells. [hourHeightPx] is one hour's pixel
  * height; [color] is resolved by the caller from the theme.
  */
-fun Modifier.hourGridCells(show: Boolean, hourHeightPx: Float, color: Color): Modifier =
+fun Modifier.hourGridCells(
+    show: Boolean,
+    hourHeightPx: Float,
+    color: Color,
+): Modifier =
     if (!show) {
         this
     } else {
@@ -71,10 +75,11 @@ fun Modifier.hourGridCells(show: Boolean, hourHeightPx: Float, color: Color): Mo
                 hourCellRadiusPx(cellHeight, size.width, HOUR_CELL_CORNER.toPx()),
             )
             val cellSize = Size(size.width, cellHeight)
+            val top = inset
             for (hour in 0 until 24) {
                 drawRoundRect(
                     color = color,
-                    topLeft = Offset(0f, hour * hourHeightPx + inset),
+                    topLeft = Offset(0f, hour * hourHeightPx + top),
                     size = cellSize,
                     cornerRadius = radius,
                 )

app/src/main/java/de/jeanlucmakiola/calendula/ui/common/OutOfViewEdges.kt

@@ -0,0 +1,328 @@
+package de.jeanlucmakiola.calendula.ui.common
+
+import androidx.compose.animation.core.FiniteAnimationSpec
+import androidx.compose.foundation.ScrollState
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.BoxScope
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.offset
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.shape.CircleShape
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.Immutable
+import androidx.compose.runtime.Stable
+import androidx.compose.runtime.SideEffect
+import androidx.compose.runtime.derivedStateOf
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableFloatStateOf
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberCoroutineScope
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.graphicsLayer
+import androidx.compose.ui.platform.LocalDensity
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.semantics.Role
+import androidx.compose.ui.semantics.contentDescription
+import androidx.compose.ui.semantics.onClick
+import androidx.compose.ui.semantics.role
+import androidx.compose.ui.semantics.semantics
+import androidx.compose.ui.unit.IntOffset
+import androidx.compose.ui.unit.dp
+import de.jeanlucmakiola.calendula.R
+import de.jeanlucmakiola.calendula.ui.week.TimedBlock
+import de.jeanlucmakiola.floret.identity.rememberReduceMotion
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.launch
+import kotlin.math.roundToInt
+
+/** Thickness of the out-of-view edge bar. */
+private val EDGE_BAR_THICKNESS = 3.dp
+
+/** Band the bar sits in, and the room a revealed event keeps from the edge. */
+private val EDGE_TOUCH_HEIGHT = 24.dp
+
+/** How far from the viewport's edge a tap on empty column still hits the bar. */
+private val EDGE_TAP_REACH = 16.dp
+
+/**
+ * How far the bar sits in from the viewport's edges — enough to clear the
+ * timeline's rounded 16dp corners on the outer columns.
+ */
+private val EDGE_BAR_VERTICAL_INSET = 4.dp
+private val EDGE_BAR_HORIZONTAL_INSET = 6.dp
+
+/** Distance outside the viewport over which a bar fades before its event appears. */
+private val EDGE_FADE_LEAD = 24.dp
+
+/** The nearest timed blocks wholly above and below a column's viewport. */
+@Immutable
+data class OutOfViewEvents(val above: TimedBlock?, val below: TimedBlock?) {
+    companion object {
+        val None = OutOfViewEvents(null, null)
+    }
+}
+
+/** Which edge of the viewport a hidden event sits past. */
+enum class ViewportEdge { Top, Bottom }
+
+/** Where [block]'s rendered bottom lands, in minutes — short blocks keep a floor. */
+internal fun renderedEndMin(block: TimedBlock): Float =
+    maxOf(block.endMin.toFloat(), block.startMin + MIN_EVENT_FRACTION * 60f)
+
+/**
+ * The blocks of one column lying out of a viewport spanning [topMin]..[bottomMin]
+ * (minutes of the day), nearest first. A block leaves this set as soon as any
+ * part of its rendered height enters the viewport.
+ */
+fun outOfViewEvents(
+    blocks: List<TimedBlock>,
+    topMin: Float,
+    bottomMin: Float,
+): OutOfViewEvents {
+    val above = blocks
+        .filter { renderedEndMin(it) <= topMin }
+        .maxWithOrNull(compareBy<TimedBlock>({ renderedEndMin(it) }, { it.startMin }))
+    val below = blocks
+        .filter { it.startMin >= bottomMin }
+        .minWithOrNull(compareBy<TimedBlock>({ it.startMin }, { -renderedEndMin(it) }))
+    return OutOfViewEvents(above, below)
+}
+
+/**
+ * The scroll offset that brings [block] into a [viewportPx]-tall viewport from
+ * past [edge], with [marginPx] of room so it clears the edge bar. An event above
+ * lands with its start at the top; one below lands whole at the bottom when it
+ * fits, and with its start at the top when it does not.
+ */
+fun revealScrollTarget(
+    block: TimedBlock,
+    edge: ViewportEdge,
+    hourPx: Float,
+    viewportPx: Int,
+    marginPx: Float,
+    maxScroll: Int,
+): Int {
+    val startPx = block.startMin / 60f * hourPx
+    val endPx = renderedEndMin(block) / 60f * hourPx
+    val target = when (edge) {
+        ViewportEdge.Top -> startPx - marginPx
+        ViewportEdge.Bottom -> minOf(endPx + marginPx - viewportPx, startPx - marginPx)
+    }
+    return target.roundToInt().coerceIn(0, maxOf(maxScroll, 0))
+}
+
+/**
+ * The edge whose bar a tap at [y] (content px) lands on, if that bar is showing
+ * and the tap is within [reachPx] of the viewport's edge.
+ */
+fun tappedEdge(
+    events: OutOfViewEvents,
+    y: Float,
+    viewportTop: Float,
+    viewportPx: Int,
+    reachPx: Float,
+): ViewportEdge? = when {
+    events.above != null && y - viewportTop <= reachPx -> ViewportEdge.Top
+    events.below != null && viewportTop + viewportPx - y <= reachPx -> ViewportEdge.Bottom
+    else -> null
+}
+
+/** Fade while the event is still outside; never draw its bar at the boundary. */
+internal fun edgeBarAlpha(gapPx: Float, fadeLeadPx: Float): Float = when {
+    gapPx <= 0f -> 0f
+    fadeLeadPx <= 0f -> 1f
+    else -> (gapPx / fadeLeadPx).coerceIn(0f, 1f)
+}
+
+/**
+ * The out-of-view state of one day column (#188): which events hide past its
+ * edges, and the scroll that reveals them.
+ *
+ * The bars take no touches themselves, so event blocks under them keep their
+ * taps and drags; the column's own tap handler offers taps to [tap] first.
+ */
+@Stable
+class OutOfViewEdges internal constructor(
+    private val scrollState: ScrollState,
+    private val scope: CoroutineScope,
+) {
+    internal var blocks by mutableStateOf(emptyList<TimedBlock>())
+    internal var hourPx by mutableFloatStateOf(0f)
+    internal var fadeLeadPx by mutableFloatStateOf(0f)
+    internal var marginPx by mutableFloatStateOf(0f)
+    internal var reachPx by mutableFloatStateOf(0f)
+    internal var reduceMotion = false
+    internal var revealSpec: FiniteAnimationSpec<Float>? = null
+
+    val events: OutOfViewEvents by derivedStateOf {
+        val viewport = scrollState.viewportSize
+        if (viewport <= 0 || hourPx <= 0f) {
+            OutOfViewEvents.None
+        } else {
+            val top = scrollState.value.toFloat()
+            outOfViewEvents(
+                blocks = blocks,
+                topMin = top / hourPx * 60f,
+                bottomMin = (top + viewport) / hourPx * 60f,
+            )
+        }
+    }
+
+    /** Scrolls the event hidden past [edge] into view, if there is one. */
+    fun reveal(edge: ViewportEdge) {
+        val block = if (edge == ViewportEdge.Top) events.above else events.below
+        block ?: return
+        val target = revealScrollTarget(
+            block = block,
+            edge = edge,
+            hourPx = hourPx,
+            viewportPx = scrollState.viewportSize,
+            marginPx = marginPx,
+            maxScroll = scrollState.maxValue,
+        )
+        val spec = revealSpec
+        scope.launch {
+            if (reduceMotion || spec == null) {
+                scrollState.scrollTo(target)
+            } else {
+                scrollState.animateScrollTo(target, spec)
+            }
+        }
+    }
+
+    /** Reveals the hidden event if a tap at [y] (content px) lands on a bar. */
+    fun tap(y: Float): Boolean {
+        val edge = tappedEdge(
+            events = events,
+            y = y,
+            viewportTop = scrollState.value.toFloat(),
+            viewportPx = scrollState.viewportSize,
+            reachPx = reachPx,
+        ) ?: return false
+        reveal(edge)
+        return true
+    }
+}
+
+@Composable
+fun rememberOutOfViewEdges(
+    blocks: List<TimedBlock>,
+    scrollState: ScrollState,
+    hourPx: Float,
+): OutOfViewEdges {
+    val scope = rememberCoroutineScope()
+    val edges = remember(scrollState, scope) { OutOfViewEdges(scrollState, scope) }
+    val density = LocalDensity.current
+    val reduceMotion = rememberReduceMotion()
+    val revealSpec = rememberCalendarPageSpec()
+    SideEffect {
+        edges.blocks = blocks
+        edges.hourPx = hourPx
+        edges.fadeLeadPx = with(density) { EDGE_FADE_LEAD.toPx() }
+        edges.marginPx = with(density) { EDGE_TOUCH_HEIGHT.roundToPx().toFloat() }
+        edges.reachPx = with(density) { EDGE_TAP_REACH.toPx() }
+        edges.reduceMotion = reduceMotion
+        edges.revealSpec = revealSpec
+    }
+    return edges
+}
+
+/**
+ * Thin bars at the top and bottom of a day column's visible viewport, tinted in
+ * the colour of the nearest timed event hidden past that edge (#188).
+ *
+ * Lives inside the column's scrolling content and follows the viewport by
+ * offsetting against [scrollState] at placement rather than recomposing every
+ * frame. Opacity follows the gap to the hidden event and reaches zero before
+ * the event enters view. Taps reach it through [OutOfViewEdges.tap]; screen
+ * readers get a button.
+ */
+@Composable
+fun BoxScope.OutOfViewEdgeBars(
+    edges: OutOfViewEdges,
+    scrollState: ScrollState,
+    dark: Boolean,
+) {
+    val touchPx = with(LocalDensity.current) { EDGE_TOUCH_HEIGHT.roundToPx() }
+    val events = edges.events
+    EdgeBar(
+        block = events.above,
+        edge = ViewportEdge.Top,
+        dark = dark,
+        onReveal = edges::reveal,
+        scrollState = scrollState,
+        hourPx = edges.hourPx,
+        fadeLeadPx = edges.fadeLeadPx,
+        modifier = Modifier
+            .align(Alignment.TopStart)
+            .offset { IntOffset(0, scrollState.value) },
+    )
+    EdgeBar(
+        block = events.below,
+        edge = ViewportEdge.Bottom,
+        dark = dark,
+        onReveal = edges::reveal,
+        scrollState = scrollState,
+        hourPx = edges.hourPx,
+        fadeLeadPx = edges.fadeLeadPx,
+        modifier = Modifier
+            .align(Alignment.TopStart)
+            .offset { IntOffset(0, scrollState.value + scrollState.viewportSize - touchPx) },
+    )
+}
+
+@Composable
+private fun EdgeBar(
+    block: TimedBlock?,
+    edge: ViewportEdge,
+    dark: Boolean,
+    onReveal: (ViewportEdge) -> Unit,
+    scrollState: ScrollState,
+    hourPx: Float,
+    fadeLeadPx: Float,
+    modifier: Modifier = Modifier,
+) {
+    block ?: return
+    val color = eventFill(block.event.color, dark, LocalSoftenColors.current)
+    val label = stringResource(
+        if (edge == ViewportEdge.Top) R.string.timeline_earlier_events else R.string.timeline_later_events,
+    )
+    Box(
+        modifier = modifier
+            .fillMaxWidth()
+            .height(EDGE_TOUCH_HEIGHT)
+            .graphicsLayer {
+                val gapPx = when (edge) {
+                    ViewportEdge.Top -> scrollState.value - renderedEndMin(block) / 60f * hourPx
+                    ViewportEdge.Bottom -> block.startMin / 60f * hourPx -
+                        (scrollState.value + scrollState.viewportSize)
+                }
+                alpha = edgeBarAlpha(gapPx, fadeLeadPx)
+            }
+            .semantics {
+                role = Role.Button
+                contentDescription = label
+                onClick {
+                    onReveal(edge)
+                    true
+                }
+            },
+        contentAlignment = if (edge == ViewportEdge.Top) Alignment.TopCenter else Alignment.BottomCenter,
+    ) {
+        Box(
+            modifier = Modifier
+                .fillMaxWidth()
+                .padding(
+                    horizontal = EDGE_BAR_HORIZONTAL_INSET,
+                    vertical = EDGE_BAR_VERTICAL_INSET,
+                )
+                .height(EDGE_BAR_THICKNESS)
+                .background(color, CircleShape),
+        )
+    }
+}

app/src/main/java/de/jeanlucmakiola/calendula/ui/common/PageStateCache.kt

@@ -0,0 +1,53 @@
+package de.jeanlucmakiola.calendula.ui.common
+
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.SupervisorJob
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.SharingStarted
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.stateIn
+import kotlinx.coroutines.plus
+
+/**
+ * One shared state per pager page — a week, a day, a month — so a page and the
+ * screen's anchor read the same query, and the pages either side stay loaded
+ * across a swipe.
+ *
+ * Every entry shares on its own job, cancelled when [keep] lets it go: a
+ * `stateIn` on the ViewModel's scope would stay running, holding its last state,
+ * until the ViewModel itself was cleared. Main thread only.
+ *
+ * @param keep whether a cached key is still worth holding once [get] asks for another.
+ */
+class PageStateCache<K, S>(
+    private val scope: CoroutineScope,
+    private val initial: S,
+    private val keep: (cached: K, requested: K) -> Boolean,
+    private val load: (K) -> Flow<S>,
+) {
+    private class Entry<S>(val state: StateFlow<S>, val job: Job)
+
+    private val entries = HashMap<K, Entry<S>>()
+
+    /** The number of entries held, for tests. */
+    internal val size: Int get() = entries.size
+
+    fun get(key: K): StateFlow<S> {
+        val iterator = entries.iterator()
+        while (iterator.hasNext()) {
+            val (cached, entry) = iterator.next()
+            if (cached != key && !keep(cached, key)) {
+                entry.job.cancel()
+                iterator.remove()
+            }
+        }
+        return entries.getOrPut(key) {
+            val job = SupervisorJob(scope.coroutineContext[Job])
+            Entry(
+                state = load(key).stateIn(scope + job, SharingStarted.WhileSubscribed(5_000L), initial),
+                job = job,
+            )
+        }.state
+    }
+}

app/src/main/java/de/jeanlucmakiola/calendula/ui/common/TimelineDrag.kt

@@ -284,8 +284,8 @@ class TimelineGeometry {
 }
 
 /**
- * Hoisted drag state for one timeline (#68). It lives above the per-page
+ * Hoisted drag state for one timeline (#68). It lives above the pager, so a
- * `AnimatedContent`, so a page change mid-drag can't strand a ghost, and the
+ * page change mid-drag can't strand a ghost, and the
  * block it renders is drawn in an overlay, clear of the day column's clip.
  */
 @Stable

app/src/main/java/de/jeanlucmakiola/calendula/ui/common/TimelineHours.kt

@@ -0,0 +1,58 @@
+package de.jeanlucmakiola.calendula.ui.common
+
+import kotlin.math.abs
+import kotlin.math.roundToInt
+
+/**
+ * The hours the week and day timelines fit to the screen when they open (#322).
+ *
+ * Nothing outside the range is hidden: [TimelineScale.FitHours] only sizes the
+ * hour so that [startHour]..[endHour] fills the viewport, and the timeline opens
+ * scrolled to [startHour]. The hours are kept when [enabled] is switched off, so
+ * switching it back on restores the chosen range.
+ */
+data class TimelineHours(
+    val enabled: Boolean = false,
+    val startHour: Int = DEFAULT_START_HOUR,
+    val endHour: Int = DEFAULT_END_HOUR,
+) {
+    val span: Int get() = endHour - startHour
+
+    companion object {
+        const val DEFAULT_START_HOUR = 7
+        const val DEFAULT_END_HOUR = 22
+
+        /** Shortest range that can be chosen, in hours. */
+        const val MIN_SPAN = 2
+
+        /**
+         * A range with [startHour] and [endHour] held to the day and at least
+         * [MIN_SPAN] apart; the start gives way when the two collide.
+         */
+        fun of(enabled: Boolean, startHour: Int, endHour: Int): TimelineHours {
+            val end = endHour.coerceIn(MIN_SPAN, 24)
+            val start = startHour.coerceIn(0, end - MIN_SPAN)
+            return TimelineHours(enabled, start, end)
+        }
+
+        /** Start hours that still leave [MIN_SPAN] before [endHour]. */
+        fun startOptions(endHour: Int): List<Int> = (0..endHour - MIN_SPAN).toList()
+
+        /** End hours at least [MIN_SPAN] after [startHour]; 24 is midnight. */
+        fun endOptions(startHour: Int): List<Int> = (startHour + MIN_SPAN..24).toList()
+    }
+}
+
+/**
+ * The scroll offset that puts [startHour] at the top of a timeline laid out
+ * with [maxValue] scroll range over a [viewportPx] viewport, or null while that
+ * layout is not yet at [hourPx] per hour — the scale changes a frame before the
+ * content grows to match it, and scrolling against the old layout would land on
+ * the wrong hour.
+ */
+internal fun startHourScroll(maxValue: Int, viewportPx: Int, startHour: Int, hourPx: Float): Int? {
+    if (viewportPx <= 0 || maxValue < 0 || maxValue == Int.MAX_VALUE) return null
+    val laidOutHourPx = (maxValue + viewportPx) / 24f
+    if (abs(laidOutHourPx - hourPx) > 1f) return null
+    return (startHour * laidOutHourPx).roundToInt().coerceIn(0, maxValue)
+}

app/src/main/java/de/jeanlucmakiola/calendula/ui/common/TimelineScale.kt

@@ -38,6 +38,12 @@ sealed interface TimelineScale {
     /** A height the user pinched to. Build it through [custom], which clamps. */
     data class Custom(val hourHeight: Dp) : TimelineScale
 
+    /**
+     * [startHour]..[endHour] fills the viewport (#322). Applied when a timeline
+     * opens with [TimelineHours] on, never picked from the preset list.
+     */
+    data class FitHours(val startHour: Int, val endHour: Int) : TimelineScale
+
     companion object {
         /** The named steps the settings picker offers, coarse to roomy. */
         val presets: List<TimelineScale> = listOf(FitDay, Compact, Regular, Comfortable)
@@ -74,6 +80,9 @@ fun TimelineScale.hourHeight(viewportHeight: Dp): Dp = when (this) {
     is TimelineScale.Custom -> this.hourHeight
         .coerceAtMost(MAX_PINCH_HOUR_HEIGHT)
         .coerceAtLeast(fillHourHeight(viewportHeight))
+    is TimelineScale.FitHours -> (viewportHeight / (endHour - startHour).coerceIn(1, 24).toFloat())
+        .coerceAtMost(MAX_PINCH_HOUR_HEIGHT)
+        .coerceAtLeast(fillHourHeight(viewportHeight))
 }
 
 /**
@@ -134,6 +143,7 @@ val TimelineScale.labelRes: Int
         TimelineScale.Regular -> R.string.timeline_scale_regular
         TimelineScale.Comfortable -> R.string.timeline_scale_comfortable
         is TimelineScale.Custom -> R.string.timeline_scale_custom
+        is TimelineScale.FitHours -> R.string.settings_visible_hours
     }
 
 @get:StringRes
@@ -144,11 +154,15 @@ val TimelineScale.descriptionRes: Int
         TimelineScale.Regular -> R.string.timeline_scale_regular_summary
         TimelineScale.Comfortable -> R.string.timeline_scale_comfortable_summary
         is TimelineScale.Custom -> R.string.timeline_scale_custom_summary
+        is TimelineScale.FitHours -> R.string.settings_visible_hours_summary
     }
 
 /** Marks a stored custom height; the rest of the value is its dp. */
 private const val CUSTOM_PREFIX = "custom:"
 
+/** Marks a stored hour range, as `start-end`. */
+private const val HOURS_PREFIX = "hours:"
+
 /**
  * Stored names for the presets. Spelled out rather than taken from `toString()`
  * so R8 can't rename them out from under an existing install — and they match
@@ -171,6 +185,7 @@ private val PRESET_NAMES: Map<TimelineScale, String> = mapOf(
  */
 fun TimelineScale.storageValue(): String = when (this) {
     is TimelineScale.Custom -> CUSTOM_PREFIX + hourHeight.value
+    is TimelineScale.FitHours -> "$HOURS_PREFIX$startHour-$endHour"
     TimelineScale.FitDay,
     TimelineScale.Compact,
     TimelineScale.Regular,
@@ -188,5 +203,11 @@ fun parseTimelineScale(stored: String?): TimelineScale = when {
     stored.startsWith(CUSTOM_PREFIX) -> stored.removePrefix(CUSTOM_PREFIX).toFloatOrNull()
         ?.let { TimelineScale.custom(it.dp) }
         ?: TimelineScale.Regular
+    stored.startsWith(HOURS_PREFIX) -> stored.removePrefix(HOURS_PREFIX).split('-')
+        .mapNotNull { it.toIntOrNull() }
+        .takeIf { it.size == 2 }
+        ?.let { (start, end) -> TimelineHours.of(enabled = true, start, end) }
+        ?.let { TimelineScale.FitHours(it.startHour, it.endHour) }
+        ?: TimelineScale.Regular
     else -> PRESET_NAMES.entries.firstOrNull { it.value == stored }?.key ?: TimelineScale.Regular
 }

app/src/main/java/de/jeanlucmakiola/calendula/ui/common/TimelineScroll.kt

@@ -0,0 +1,101 @@
+package de.jeanlucmakiola.calendula.ui.common
+
+import androidx.compose.foundation.ScrollState
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.setValue
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.Stable
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberUpdatedState
+import androidx.compose.runtime.snapshotFlow
+import androidx.compose.runtime.staticCompositionLocalOf
+import androidx.compose.ui.platform.LocalDensity
+import androidx.compose.ui.unit.Dp
+import kotlinx.coroutines.flow.filterNotNull
+import kotlinx.coroutines.flow.first
+import kotlin.math.roundToInt
+
+/**
+ * Where 00:00 sat in the last timeline shown, measured from the top of its
+ * view's content, so the next timeline view opens on the same hours (#184): an
+ * event in both keeps its place and only grows sideways.
+ */
+class TimelineScrollMemory {
+    var midnightY: Float? = null
+}
+
+val LocalTimelineScroll = staticCompositionLocalOf<TimelineScrollMemory?> { null }
+
+/** A timeline's scroll, and where it opens before it can scroll there. */
+@Stable
+class TimelineScroll(val state: ScrollState, noonPending: Boolean, private val openingHour: Int?) {
+    /** Whether it is still to be put on noon, which it only can be once laid out. */
+    var noonPending by mutableStateOf(noonPending)
+        internal set
+
+    /** The top of what it shows, or will once open, over [content] pixels in a [viewport] pixels high. */
+    fun top(viewport: Float, content: Float): Float =
+        if (noonPending) {
+            (openingHour?.let { it * content / 24f } ?: (content - viewport) / 2f)
+                .coerceIn(0f, (content - viewport).coerceAtLeast(0f))
+        } else state.value.toFloat()
+}
+
+val LocalOpeningTimeline = staticCompositionLocalOf<TimelineScroll?> { null }
+
+/**
+ * The scroll state of a timeline whose scrolling area starts [timelineTop] below
+ * its view's content top. Opens where the last timeline left off, or on noon the
+ * first time.
+ */
+@Composable
+fun rememberTimelineScrollState(timelineTop: Dp): TimelineScroll {
+    val memory = LocalTimelineScroll.current
+    val density = LocalDensity.current
+    val zoom = LocalTimelineZoom.current
+    val topPx = with(density) { timelineTop.toPx() }
+    val remembered = memory?.midnightY
+    val scrollState = rememberScrollState(
+        initial = remembered?.let { (topPx - it).roundToInt().coerceAtLeast(0) } ?: 0,
+    )
+    val scroll = remember(scrollState) {
+        TimelineScroll(
+            scrollState,
+            noonPending = remembered == null,
+            openingHour = zoom.hours.takeIf { it.enabled }?.startHour,
+        )
+    }
+    val currentTop by rememberUpdatedState(topPx)
+    var firstOpen by remember(scrollState) { mutableStateOf(true) }
+    LaunchedEffect(scrollState, zoom, zoom.hours) {
+        if (firstOpen && remembered != null) {
+            firstOpen = false
+            return@LaunchedEffect
+        }
+        firstOpen = false
+        val startHour = zoom.open()
+        if (startHour == null) {
+            snapshotFlow { scrollState.maxValue }.first { it > 0 }
+            scrollState.scrollTo(scrollState.maxValue / 2)
+        } else {
+            val (target, hourHeight) = snapshotFlow {
+                val viewport = scrollState.viewportSize
+                val hourHeight = zoom.scale.hourHeight(with(density) { viewport.toDp() })
+                val hourPx = with(density) { hourHeight.toPx() }
+                startHourScroll(scrollState.maxValue, viewport, startHour, hourPx)?.let { it to hourHeight }
+            }.filterNotNull().first()
+            scrollState.scrollTo(target)
+            zoom.holdFit(hourHeight)
+        }
+        scroll.noonPending = false
+    }
+    if (memory != null) {
+        LaunchedEffect(scrollState, memory) {
+            snapshotFlow { currentTop - scrollState.value }.collect { memory.midnightY = it }
+        }
+    }
+    return scroll
+}

app/src/main/java/de/jeanlucmakiola/calendula/ui/common/TimelineZoom.kt

@@ -49,13 +49,49 @@ class TimelineZoom(
     var isPinching: Boolean by mutableStateOf(false)
         private set
 
+    /** The visible-hours preference (#322); a timeline re-fits when it changes. */
+    var hours: TimelineHours by mutableStateOf(TimelineHours())
+        private set
+
+    private var stored: TimelineScale = initial
+
     /**
      * Take a value that came from the preference. Ignored mid-pinch: the stored
      * value is a frame or two behind the fingers there, and letting it land would
-     * snap the timeline back while the user is still pinching.
+     * snap the timeline back while the user is still pinching. With visible
+     * hours on it is only remembered, so a late-arriving preference can't undo
+     * the fit a timeline just opened with.
      */
     fun adopt(stored: TimelineScale) {
-        if (!isPinching) scale = stored
+        this.stored = stored
+        if (!isPinching && !hours.enabled) scale = stored
+    }
+
+    /** Take the visible-hours preference; switching it off hands back the stored scale. */
+    fun adoptHours(hours: TimelineHours) {
+        val wasEnabled = this.hours.enabled
+        this.hours = hours
+        if (wasEnabled && !hours.enabled && !isPinching) scale = stored
+    }
+
+    /**
+     * A timeline is opening. With visible hours on, the range replaces whatever
+     * scale is in force — a stored preset and a pinch alike — and its start hour
+     * is returned for the timeline to scroll to; otherwise null.
+     */
+    fun open(): Int? {
+        val hours = hours
+        if (!hours.enabled) return null
+        if (!isPinching) scale = TimelineScale.FitHours(hours.startHour, hours.endHour)
+        return hours.startHour
+    }
+
+    /**
+     * Holds the height [open] fitted, so a viewport that changes afterwards (the
+     * all-day strip following a swipe) doesn't rescale the hours under the scroll.
+     */
+    fun holdFit(hourHeight: Dp) {
+        if (!isPinching && scale is TimelineScale.FitHours) scale = TimelineScale.Custom(hourHeight)
     }
 
     fun beginPinch() {
@@ -66,9 +102,10 @@ class TimelineZoom(
         scale = TimelineScale.custom(hourHeight)
     }
 
+    /** Settles the pinch. With visible hours on it only lasts until the next [open]. */
     fun endPinch() {
         isPinching = false
-        persist(scale)
+        if (!hours.enabled) persist(scale)
     }
 }
 
@@ -82,16 +119,18 @@ private val DetachedTimelineZoom by lazy { TimelineZoom(TimelineScale.Regular) {
 val LocalTimelineZoom = staticCompositionLocalOf { DetachedTimelineZoom }
 
 /**
- * The app-wide [TimelineZoom], seeded from [stored] and writing settled pinches
+ * The app-wide [TimelineZoom], seeded from [stored] and [hours] and writing
- * back through [onPersist].
+ * settled pinches back through [onPersist].
  */
 @Composable
 fun rememberTimelineZoom(
     stored: TimelineScale,
+    hours: TimelineHours,
     onPersist: (TimelineScale) -> Unit,
 ): TimelineZoom {
     val persist by rememberUpdatedState(onPersist)
     val zoom = remember { TimelineZoom(stored) { persist(it) } }
+    LaunchedEffect(hours) { zoom.adoptHours(hours) }
     // Picking a preset in Settings has to reach the timelines, and so does the
     // stored value arriving after the first frame.
     LaunchedEffect(stored) { zoom.adopt(stored) }

app/src/main/java/de/jeanlucmakiola/calendula/ui/common/TodayAction.kt

@@ -7,9 +7,9 @@ import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material3.IconButton
 import androidx.compose.material3.LocalContentColor
 import androidx.compose.material3.Text
+import androidx.compose.runtime.getValue
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.derivedStateOf
-import androidx.compose.runtime.getValue
 import androidx.compose.runtime.remember
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
@@ -59,7 +59,8 @@ fun TodayAction(show: Boolean, onToday: () -> Unit) {
     val description = stringResource(R.string.today_jump_action)
     IconButton(
         onClick = onToday,
-        modifier = Modifier.semantics { contentDescription = description },
+        modifier = Modifier
+            .semantics { contentDescription = description },
     ) {
         val textSize = with(LocalDensity.current) { GlyphTextHeight.toSp() }
         Box(

app/src/main/java/de/jeanlucmakiola/calendula/ui/common/ViewFocus.kt

@@ -0,0 +1,49 @@
+package de.jeanlucmakiola.calendula.ui.common
+
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.Stable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.saveable.Saver
+import androidx.compose.runtime.setValue
+import androidx.compose.runtime.staticCompositionLocalOf
+import kotlinx.datetime.LocalDate
+
+/**
+ * The date every calendar view is looking at (#184), so switching views keeps
+ * the same days on screen and what is shown in both can travel between them.
+ *
+ * A view reads it once, as it comes on screen, and writes it back only when the
+ * user moves: a view settling where it opened must not nudge it, or switching
+ * back and forth would drift.
+ */
+@Stable
+class ViewFocus(initial: LocalDate) {
+    var date by mutableStateOf(initial)
+    /** Explicit navigation, including a request for the view already on screen. */
+    var navigationVersion by mutableStateOf(0)
+        private set
+
+    fun navigateTo(target: LocalDate) {
+        date = target
+        navigationVersion++
+    }
+}
+
+val ViewFocusSaver: Saver<ViewFocus, String> = Saver(
+    save = { it.date.toString() },
+    restore = { ViewFocus(LocalDate.parse(it)) },
+)
+
+val LocalViewFocus = staticCompositionLocalOf<ViewFocus?> { null }
+
+/**
+ * Runs [enter] with the focused date once, as the view comes on screen, before
+ * it reads its own position: its first frame is then already on that date.
+ */
+@Composable
+fun <T : Any> EnterOnFocus(key: T, enter: (LocalDate) -> Unit) {
+    val focus = LocalViewFocus.current
+    remember(key) { focus?.date?.also(enter) }
+}

app/src/main/java/de/jeanlucmakiola/calendula/ui/common/ViewMorph.kt

@@ -0,0 +1,166 @@
+package de.jeanlucmakiola.calendula.ui.common
+
+import androidx.compose.animation.AnimatedVisibilityScope
+import androidx.compose.animation.BoundsTransform
+import androidx.compose.animation.ExperimentalSharedTransitionApi
+import androidx.compose.animation.SharedTransitionScope
+import androidx.compose.animation.core.FiniteAnimationSpec
+import androidx.compose.animation.fadeIn
+import androidx.compose.animation.fadeOut
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.CompositionLocalProvider
+import androidx.compose.runtime.compositionLocalOf
+import androidx.compose.runtime.DisposableEffect
+import androidx.compose.runtime.mutableStateSetOf
+import androidx.compose.runtime.remember
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.geometry.Rect
+import androidx.compose.ui.graphics.Path
+import androidx.compose.ui.unit.Density
+import androidx.compose.ui.unit.LayoutDirection
+import de.jeanlucmakiola.calendula.domain.EventInstance
+import kotlinx.datetime.LocalDate
+
+/**
+ * What the views share when switching between them (#184): an event visible in
+ * both grows from where it sat into where it lands, a date label travels to its
+ * new seat, and everything else fades through.
+ *
+ * An element is tagged with the day it is drawn *from*, not just its instance: a
+ * multi-day event is drawn once per day, per week row or per timeline column,
+ * and only one element per key may take part. The segment that starts on the
+ * same day in both views is the one that travels; the rest fade where they are.
+ */
+sealed interface ViewMorphKey {
+    data class Event(val eventId: Long, val beginMillis: Long, val day: LocalDate) : ViewMorphKey
+
+    data class Day(val date: LocalDate) : ViewMorphKey
+
+
+    companion object {
+        /** [event]'s occurrence as drawn from [day]. */
+        fun event(event: EventInstance, day: LocalDate): Event =
+            Event(event.eventId, event.start.toEpochMilliseconds(), day)
+    }
+}
+
+/** The view switch's scopes and specs, captured where they exist. Null under reduced motion. */
+@OptIn(ExperimentalSharedTransitionApi::class)
+class ViewMorphScope(
+    val shared: SharedTransitionScope,
+    val visibility: AnimatedVisibilityScope,
+    val boundsTransform: BoundsTransform,
+    val fadeSpec: FiniteAnimationSpec<Float>,
+    val clip: BelowTopBarClip,
+    val stayingPut: StayingPut,
+)
+
+/**
+ * The events a view has but keeps out of the switch, being scrolled out of
+ * sight: the other view leaves them untagged too, or its half would travel to
+ * nowhere and snap into place at the end.
+ */
+class StayingPut {
+    val keys = mutableStateSetOf<ViewMorphKey.Event>()
+}
+
+/** Marks [key] as staying put while [stays], for as long as it is composed. */
+@Composable
+fun StayPut(key: ViewMorphKey.Event, stays: Boolean) {
+    val stayingPut = LocalViewMorph.current?.stayingPut ?: return
+    if (!stays) return
+    DisposableEffect(stayingPut, key) {
+        stayingPut.keys += key
+        onDispose { stayingPut.keys -= key }
+    }
+}
+
+/**
+ * Keeps what travels below the top bar, which every view has at the same height:
+ * the overlay draws above the whole screen, so an event scrolled under the bar
+ * would otherwise cross it. [top] is the bar's bottom edge in the shared layout.
+ */
+@OptIn(ExperimentalSharedTransitionApi::class)
+class BelowTopBarClip : SharedTransitionScope.OverlayClip {
+    var top = 0f
+
+    override fun getClipPath(
+        sharedContentState: SharedTransitionScope.SharedContentState,
+        bounds: Rect,
+        layoutDirection: LayoutDirection,
+        density: Density,
+    ): Path = Path().apply { addRect(Rect(-FAR, top, FAR, FAR)) }
+
+    private companion object {
+        const val FAR = 1e6f
+    }
+}
+
+val LocalViewMorph = compositionLocalOf<ViewMorphScope?> { null }
+
+/**
+ * Whether a pager page may carry the morph tags: only the settled one. Its
+ * neighbours are composed ahead and repeat some of its dates, which would both
+ * claim its keys and fly in from off screen.
+ */
+fun morphPageActive(page: Int, settledPage: Int): Boolean = page == settledPage
+
+/** Provides the view morph to [content] only while [active] — see [morphPageActive]. */
+@Composable
+fun ViewMorphPage(active: Boolean, content: @Composable () -> Unit) {
+    val morph = LocalViewMorph.current
+    CompositionLocalProvider(LocalViewMorph provides morph.takeIf { active }, content = content)
+}
+
+/**
+ * Tags an event chip, bar, block or row. Its bounds are shared and the two faces
+ * cross-fade inside them; remeasured rather than scaled, so a title keeps its
+ * real size and is clipped while there is no room, instead of smearing.
+ *
+ * Goes after the element's offset and before its size, so the travelling bounds
+ * drive the measurement.
+ */
+@OptIn(ExperimentalSharedTransitionApi::class)
+@Composable
+fun Modifier.morphEvent(key: ViewMorphKey.Event): Modifier {
+    val morph = LocalViewMorph.current ?: return this
+    if (key in morph.stayingPut.keys) return this
+    return with(morph.shared) {
+        this@morphEvent.sharedBounds(
+            sharedContentState = rememberSharedContentState(key),
+            animatedVisibilityScope = morph.visibility,
+            enter = fadeIn(morph.fadeSpec),
+            exit = fadeOut(morph.fadeSpec),
+            boundsTransform = morph.boundsTransform,
+            clipInOverlayDuringTransition = morph.clip,
+            resizeMode = SharedTransitionScope.ResizeMode.RemeasureToBounds,
+            zIndexInOverlay = 1f,
+        )
+    }
+}
+
+/** Tags a day's number, which is small on both sides, so it scales on its way. */
+@OptIn(ExperimentalSharedTransitionApi::class)
+@Composable
+fun Modifier.morphDay(date: LocalDate): Modifier {
+    val morph = LocalViewMorph.current ?: return this
+    return with(morph.shared) {
+        this@morphDay.sharedBounds(
+            sharedContentState = rememberSharedContentState(ViewMorphKey.Day(date)),
+            animatedVisibilityScope = morph.visibility,
+            enter = fadeIn(morph.fadeSpec),
+            exit = fadeOut(morph.fadeSpec),
+            boundsTransform = morph.boundsTransform,
+            clipInOverlayDuringTransition = morph.clip,
+            zIndexInOverlay = 1f,
+        )
+    }
+}
+
+/** The view switch's travel, on the same spring as the timeline's columns resizing. */
+@OptIn(ExperimentalSharedTransitionApi::class)
+@Composable
+fun rememberViewMorphBoundsTransform(): BoundsTransform {
+    val spec = rememberViewSwitchSpec<Rect>()
+    return remember(spec) { BoundsTransform { _, _ -> spec } }
+}

app/src/main/java/de/jeanlucmakiola/calendula/ui/common/ViewSwitcherPill.kt

@@ -1,12 +1,17 @@
 package de.jeanlucmakiola.calendula.ui.common
 
+import androidx.compose.animation.AnimatedContent
+import androidx.compose.animation.SizeTransform
+import androidx.compose.animation.fadeIn
+import androidx.compose.animation.fadeOut
+import androidx.compose.animation.togetherWith
 import androidx.compose.foundation.layout.padding
 import androidx.compose.material3.FilledTonalButton
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
-import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.unit.Dp
 
 /**
@@ -30,11 +35,23 @@ fun ViewSwitcherPill(
     trailingInset: Dp = AppBarSpacing.ContainerTrailingInset,
 ) {
     if (cycle.size < QuickSwitchConfig.MIN_CYCLE) return
+    val fadeSpec = rememberCalendarFadeSpec()
     FilledTonalButton(
         onClick = onCycle,
         shape = MaterialTheme.shapes.large,
-        modifier = modifier.padding(end = trailingInset),
+        modifier = modifier
+            .padding(end = trailingInset),
     ) {
-        Text(stringResource(current.labelRes))
+        // The label cross-fades and the pill eases to its width, so cycling
+        // views turns it over rather than snapping it (#184).
+        AnimatedContent(
+            targetState = current.label(),
+            transitionSpec = {
+                (fadeIn(fadeSpec) togetherWith fadeOut(fadeSpec)).using(SizeTransform(clip = false))
+            },
+            contentAlignment = Alignment.Center,
+        ) { label ->
+            Text(label)
+        }
     }
 }

app/src/main/java/de/jeanlucmakiola/calendula/ui/day/DayPaging.kt

@@ -0,0 +1,22 @@
+package de.jeanlucmakiola.calendula.ui.day
+
+import kotlinx.datetime.DateTimeUnit
+import kotlinx.datetime.LocalDate
+import kotlinx.datetime.daysUntil
+import kotlinx.datetime.plus
+
+/** Pages the day pager spans — a little under four centuries, centred on [PAGE_EPOCH]. */
+internal const val DAY_PAGE_COUNT: Int = 140_000
+
+private const val EPOCH_PAGE = DAY_PAGE_COUNT / 2
+
+/** The day at [EPOCH_PAGE]; any date works, it only has to stay fixed. */
+private val PAGE_EPOCH = LocalDate(2000, 1, 1)
+
+/** The day shown on pager [page]. */
+internal fun dayForPage(page: Int): LocalDate =
+    PAGE_EPOCH.plus(page - EPOCH_PAGE, DateTimeUnit.DAY)
+
+/** The pager page showing [date]. */
+internal fun dayPageFor(date: LocalDate): Int =
+    (EPOCH_PAGE + PAGE_EPOCH.daysUntil(date)).coerceIn(0, DAY_PAGE_COUNT - 1)

app/src/main/java/de/jeanlucmakiola/calendula/ui/day/DayScreen.kt

@@ -1,903 +0,0 @@
-package de.jeanlucmakiola.calendula.ui.day
-
-import androidx.compose.animation.AnimatedContent
-import androidx.compose.animation.core.animateDpAsState
-import androidx.compose.foundation.background
-import androidx.compose.foundation.clickable
-import androidx.compose.foundation.gestures.detectTapGestures
-import androidx.compose.foundation.isSystemInDarkTheme
-import androidx.compose.foundation.layout.Box
-import androidx.compose.foundation.layout.BoxWithConstraints
-import androidx.compose.foundation.layout.Column
-import androidx.compose.foundation.layout.Row
-import androidx.compose.foundation.layout.Spacer
-import androidx.compose.foundation.layout.fillMaxHeight
-import androidx.compose.foundation.layout.fillMaxSize
-import androidx.compose.foundation.layout.fillMaxWidth
-import androidx.compose.foundation.layout.height
-import androidx.compose.foundation.layout.offset
-import androidx.compose.foundation.layout.padding
-import androidx.compose.foundation.layout.width
-import androidx.compose.foundation.ScrollState
-import androidx.compose.foundation.rememberScrollState
-import androidx.compose.foundation.shape.RoundedCornerShape
-import androidx.compose.foundation.verticalScroll
-import androidx.compose.material.icons.Icons
-import androidx.compose.material.icons.filled.Menu
-import androidx.compose.material.icons.filled.Search
-import androidx.compose.material3.Card
-import androidx.compose.material3.CardDefaults
-import androidx.compose.material3.DrawerValue
-import androidx.compose.material3.ExperimentalMaterial3Api
-import androidx.compose.material3.Icon
-import androidx.compose.material3.IconButton
-import androidx.compose.material3.MaterialTheme
-import androidx.compose.material3.ModalNavigationDrawer
-import androidx.compose.material3.Scaffold
-import androidx.compose.material3.Text
-import androidx.compose.material3.TopAppBar
-import androidx.compose.material3.TopAppBarDefaults
-import androidx.compose.material3.rememberDrawerState
-import androidx.compose.runtime.Composable
-import androidx.compose.runtime.CompositionLocalProvider
-import androidx.compose.runtime.LaunchedEffect
-import androidx.compose.runtime.getValue
-import androidx.compose.runtime.key
-import androidx.compose.runtime.mutableIntStateOf
-import androidx.compose.runtime.remember
-import androidx.compose.runtime.rememberCoroutineScope
-import androidx.compose.runtime.rememberUpdatedState
-import androidx.compose.runtime.snapshotFlow
-import androidx.compose.runtime.setValue
-import androidx.compose.ui.Alignment
-import androidx.compose.ui.Modifier
-import androidx.compose.ui.draw.clip
-import androidx.compose.ui.draw.clipToBounds
-import androidx.compose.ui.graphics.RectangleShape
-import androidx.compose.ui.draw.alpha
-import androidx.compose.ui.input.pointer.pointerInput
-import androidx.compose.ui.layout.onGloballyPositioned
-import androidx.compose.ui.platform.LocalDensity
-import androidx.compose.ui.platform.LocalLayoutDirection
-import androidx.compose.ui.res.stringResource
-import androidx.compose.ui.semantics.contentDescription
-import androidx.compose.ui.semantics.customActions
-import androidx.compose.ui.semantics.semantics
-import androidx.compose.ui.unit.Dp
-import androidx.compose.ui.unit.LayoutDirection
-import androidx.compose.ui.unit.dp
-import androidx.hilt.navigation.compose.hiltViewModel
-import androidx.lifecycle.compose.collectAsStateWithLifecycle
-import de.jeanlucmakiola.calendula.R
-import de.jeanlucmakiola.calendula.domain.EventInstance
-import de.jeanlucmakiola.calendula.ui.common.LocalChipGround
-import de.jeanlucmakiola.calendula.ui.common.eventPaint
-import de.jeanlucmakiola.calendula.ui.common.eventSurface
-import de.jeanlucmakiola.calendula.ui.common.formatCalendarTitle
-import de.jeanlucmakiola.calendula.ui.common.CalendarDrawer
-import de.jeanlucmakiola.calendula.ui.common.CalendarTitleButton
-import de.jeanlucmakiola.calendula.ui.common.CalendarFabColumn
-import de.jeanlucmakiola.calendula.ui.common.TodayAction
-import de.jeanlucmakiola.calendula.ui.common.CalendarFailure
-import de.jeanlucmakiola.calendula.ui.common.CalendarView
-import de.jeanlucmakiola.calendula.ui.common.IMPLEMENTED_VIEWS
-import de.jeanlucmakiola.calendula.ui.common.BLOCK_OUTER_INSET
-import de.jeanlucmakiola.calendula.ui.common.BLOCK_TEXT_PADDING
-import de.jeanlucmakiola.calendula.ui.common.BlockTimeLabel
-import de.jeanlucmakiola.calendula.ui.common.BlockTitle
-import de.jeanlucmakiola.calendula.ui.common.rememberBlockTextMetrics
-import de.jeanlucmakiola.calendula.ui.common.blockTimeLines
-import de.jeanlucmakiola.calendula.ui.common.animatedBlockPlacement
-import de.jeanlucmakiola.calendula.ui.common.ghostAlpha
-import de.jeanlucmakiola.calendula.ui.common.LocalEventMove
-import de.jeanlucmakiola.calendula.ui.common.MoveRequest
-import de.jeanlucmakiola.calendula.ui.common.MoveTarget
-import de.jeanlucmakiola.calendula.ui.common.NowLine
-import de.jeanlucmakiola.calendula.ui.common.TimelineDragController
-import de.jeanlucmakiola.calendula.ui.common.TimelineDragOverlay
-import de.jeanlucmakiola.calendula.ui.common.TimelineDrop
-import de.jeanlucmakiola.calendula.ui.common.clipOffsetMinutes
-import de.jeanlucmakiola.calendula.ui.common.continuesAfter
-import de.jeanlucmakiola.calendula.ui.common.continuesBefore
-import de.jeanlucmakiola.calendula.ui.common.ChipCuts
-import de.jeanlucmakiola.calendula.ui.common.timedBlockCuts
-import de.jeanlucmakiola.calendula.ui.common.timedBlockShape
-import de.jeanlucmakiola.calendula.ui.common.eventDragAllowed
-import de.jeanlucmakiola.calendula.ui.common.eventMoveAction
-import de.jeanlucmakiola.calendula.ui.common.eventTitleOverflow
-import de.jeanlucmakiola.calendula.ui.common.rememberEventDragSource
-import de.jeanlucmakiola.calendula.ui.common.rememberTimelineDragController
-import de.jeanlucmakiola.calendula.ui.common.startInstant
-import de.jeanlucmakiola.calendula.ui.common.ViewSwitcherPill
-import de.jeanlucmakiola.calendula.ui.common.calendarSlideTransition
-import de.jeanlucmakiola.calendula.ui.common.rememberCalendarFadeSpec
-import de.jeanlucmakiola.calendula.ui.common.rememberCalendarPageSwipe
-import de.jeanlucmakiola.floret.identity.rememberReduceMotion
-import de.jeanlucmakiola.calendula.ui.common.next
-import de.jeanlucmakiola.calendula.ui.common.EventChipShape
-import de.jeanlucmakiola.calendula.ui.common.trimmedLines
-import de.jeanlucmakiola.calendula.ui.common.rememberCalendarSlideSpec
-import de.jeanlucmakiola.floret.locale.currentLocale
-import de.jeanlucmakiola.calendula.ui.common.LocalUse24HourFormat
-import de.jeanlucmakiola.calendula.ui.common.LocalShowHourGrid
-import de.jeanlucmakiola.calendula.ui.common.LocalTimelineZoom
-import de.jeanlucmakiola.calendula.ui.common.MIN_EVENT_FRACTION
-import de.jeanlucmakiola.calendula.ui.common.hourHeight
-import de.jeanlucmakiola.calendula.ui.common.rememberTimelinePinchZoom
-import de.jeanlucmakiola.calendula.ui.common.formatMinuteOfDay
-import de.jeanlucmakiola.calendula.ui.common.GUTTER_WIDTH
-import de.jeanlucmakiola.calendula.ui.common.HourGutter
-import de.jeanlucmakiola.calendula.ui.common.TIMELINE_CONTENT_END_INSET
-import de.jeanlucmakiola.calendula.ui.common.hourCellBlockInset
-import de.jeanlucmakiola.calendula.ui.common.hourGridCells
-import de.jeanlucmakiola.calendula.ui.common.tappedMinuteOfDay
-import de.jeanlucmakiola.calendula.ui.week.TimedBlock
-import kotlinx.coroutines.flow.first
-import kotlinx.coroutines.launch
-import kotlinx.datetime.LocalDate
-import kotlinx.datetime.TimeZone
-import kotlinx.datetime.toLocalDateTime
-import kotlin.time.Clock
-import java.util.Locale
-import kotlin.math.roundToInt
-
-/** One lane of the all-day strip, sized to a trimmed bar line (#190). */
-private val ALL_DAY_ROW_HEIGHT = 20.dp
-private val ALL_DAY_VERTICAL_PADDING = 6.dp
-
-/** Total all-day strip height for the day (0 when there are no all-day events). */
-internal fun DayUiState.Success.allDayStripHeight(): Dp {
-    if (allDay.isEmpty()) return 0.dp
-    val lanes = allDay.maxOf { it.lane } + 1
-    return ALL_DAY_ROW_HEIGHT * lanes + ALL_DAY_VERTICAL_PADDING * 2
-}
-
-@OptIn(ExperimentalMaterial3Api::class)
-@Composable
-fun DayScreen(
-    selectedView: CalendarView,
-    onSelectView: (CalendarView) -> Unit,
-    onEventClick: (EventInstance) -> Unit,
-    onOpenSettings: () -> Unit,
-    onOpenSearch: () -> Unit,
-    onCreateEvent: (LocalDate, Int?) -> Unit,
-    quickSwitchViews: List<CalendarView> = IMPLEMENTED_VIEWS,
-    drawerViewOrder: List<CalendarView> = IMPLEMENTED_VIEWS,
-    todayInToolbar: Boolean = false,
-    modifier: Modifier = Modifier,
-    initialDateIso: String? = null,
-    viewModel: DayViewModel = hiltViewModel(),
-) {
-    val state by viewModel.state.collectAsStateWithLifecycle()
-    val date by viewModel.date.collectAsStateWithLifecycle()
-
-    // When opened from the month grid, anchor to the tapped date.
-    LaunchedEffect(initialDateIso) {
-        initialDateIso?.let { viewModel.goToDate(LocalDate.parse(it)) }
-    }
-
-    val drawerState = rememberDrawerState(DrawerValue.Closed)
-    val scope = rememberCoroutineScope()
-
-    val isOnToday = when (val s = state) {
-        is DayUiState.Success -> s.date == s.today
-        else -> true
-    }
-
-    // Drives whether the title carries the year. Falls back to the clock only
-    // while the first load is in flight, when there is no state to read today from.
-    val currentYear = when (val s = state) {
-        is DayUiState.Success -> s.today.year
-        else -> Clock.System.now().toLocalDateTime(TimeZone.currentSystemDefault()).date.year
-    }
-
-    // Slide direction for the day transition: +1 = next, -1 = prev, 0 = jump.
-    var slideDir by remember { mutableIntStateOf(0) }
-    val goNext = { slideDir = 1; viewModel.goToNext() }
-    val goPrev = { slideDir = -1; viewModel.goToPrev() }
-    // Slide toward today: viewing the future → today comes in from the left
-    // (back), viewing the past → from the right (forward).
-    val jumpToToday = {
-        slideDir = when (val s = state) {
-            is DayUiState.Success -> if (s.today < s.date) -1 else 1
-            else -> 0
-        }
-        viewModel.goToToday()
-    }
-    // Drawer jump-to-date: slide from the side the target lies on.
-    val jumpToDate: (LocalDate) -> Unit = { target ->
-        slideDir = if (target < date) -1 else 1
-        viewModel.goToDate(target)
-    }
-
-    ModalNavigationDrawer(
-        drawerState = drawerState,
-        // Open only via the menu button — edge-swipe would fight the day swipe.
-        gesturesEnabled = drawerState.isOpen,
-        drawerContent = {
-            CalendarDrawer(
-                currentView = selectedView,
-                currentDate = date,
-                drawerState = drawerState,
-                viewOrder = drawerViewOrder,
-                onSelectView = { view ->
-                    onSelectView(view)
-                    scope.launch { drawerState.close() }
-                },
-                onJumpToDate = { target ->
-                    jumpToDate(target)
-                    scope.launch { drawerState.close() }
-                },
-                onSettings = {
-                    onOpenSettings()
-                    scope.launch { drawerState.close() }
-                },
-            )
-        },
-    ) {
-        Scaffold(
-            modifier = modifier,
-            topBar = {
-                DayTopBar(
-                    date = date,
-                    currentYear = currentYear,
-                    selectedView = selectedView,
-                    onCycleView = { onSelectView(selectedView.next(quickSwitchViews)) },
-                    quickSwitchViews = quickSwitchViews,
-                    onOpenDrawer = { scope.launch { drawerState.open() } },
-                    onOpenSearch = onOpenSearch,
-                    onJumpToDate = jumpToDate,
-                    showTodayButton = todayInToolbar,
-                    onToday = jumpToToday,
-                )
-            },
-            floatingActionButton = {
-                CalendarFabColumn(
-                    todayVisible = !isOnToday && !todayInToolbar,
-                    todayText = stringResource(R.string.day_today_action),
-                    onToday = jumpToToday,
-                    onCreate = { onCreateEvent(date, null) },
-                )
-            },
-        ) { innerPadding ->
-            DayContent(
-                state = state,
-                slideDir = slideDir,
-                onSwipeNext = goNext,
-                onSwipePrev = goPrev,
-                onRetry = jumpToToday,
-                onEventClick = onEventClick,
-                onCreateAt = { d, minutes -> onCreateEvent(d, minutes) },
-                modifier = Modifier
-                    .padding(innerPadding)
-                    .fillMaxSize(),
-            )
-        }
-    }
-}
-
-@Composable
-private fun DayContent(
-    state: DayUiState,
-    slideDir: Int,
-    onSwipeNext: () -> Unit,
-    onSwipePrev: () -> Unit,
-    onRetry: () -> Unit,
-    onEventClick: (EventInstance) -> Unit,
-    onCreateAt: (LocalDate, Int) -> Unit,
-    modifier: Modifier = Modifier,
-) {
-    val slideSpec = rememberCalendarSlideSpec()
-    val fadeSpec = rememberCalendarFadeSpec()
-    val reduceMotion = rememberReduceMotion()
-
-    // Hoisted above the per-day AnimatedContent so the vertical scroll position
-    // survives day-to-day swipes. We only centre on noon once, on first entry
-    // into the day view (i.e. when arriving from the month/week view).
-    val scrollState = rememberScrollState()
-    LaunchedEffect(Unit) {
-        snapshotFlow { scrollState.maxValue }.first { it > 0 }
-        // Half the scroll range *is* noon: the content spans a full 24 hours, so
-        // centring the range centres midday at whatever hour height is in force.
-        scrollState.scrollTo(scrollState.maxValue / 2)
-    }
-
-    // Single, hoisted all-day strip height — shared by the outgoing and incoming
-    // day during a swipe, so the strip slides along but never jumps in height.
-    val targetAllDayHeight = (state as? DayUiState.Success)?.allDayStripHeight() ?: 0.dp
-    val allDayHeight by animateDpAsState(
-        targetValue = targetAllDayHeight,
-        label = "day-all-day-strip-height",
-    )
-
-    // Whole-page horizontal swipe, one level above the timeline's vertical
-    // scroll: a horizontal drag crosses this detector's slop, while a vertical
-    // drag is consumed by the inner scroll first — the two gestures coexist.
-    val swipeModifier = rememberCalendarPageSwipe(onSwipeNext, onSwipePrev)
-
-    // Above the AnimatedContent: a page change mid-drag would strand the
-    // floating block inside the outgoing page.
-    val dragController = rememberTimelineDragController()
-    val move = LocalEventMove.current
-    val zone = remember { TimeZone.currentSystemDefault() }
-
-    Box(modifier = modifier) {
-        AnimatedContent(
-            targetState = state,
-            modifier = Modifier.fillMaxSize().then(swipeModifier),
-            contentKey = { s ->
-                when (s) {
-                    is DayUiState.Success -> "success-${s.date}"
-                    is DayUiState.Failure -> "failure-${s.reason}"
-                    DayUiState.Loading -> "loading"
-                }
-            },
-            transitionSpec = { calendarSlideTransition(slideDir, slideSpec, fadeSpec, reduceMotion) },
-            label = "day-transition",
-        ) { s ->
-            when (s) {
-                DayUiState.Loading -> DayLoading()
-                is DayUiState.Failure -> CalendarFailure(reason = s.reason, onRetry = onRetry)
-                is DayUiState.Success -> DaySuccess(
-                    state = s,
-                    scrollState = scrollState,
-                    allDayHeight = allDayHeight,
-                    dragController = dragController,
-                    onEventClick = onEventClick,
-                    onCreateAt = onCreateAt,
-                    onDrop = { drop ->
-                        move?.move(
-                            MoveRequest(
-                                eventId = drop.event.eventId,
-                                beginMillis = drop.event.start.toEpochMilliseconds(),
-                                endMillis = drop.event.end.toEpochMilliseconds(),
-                                target = MoveTarget.Start(drop.startInstant(zone)),
-                            ),
-                        )
-                    },
-                )
-            }
-        }
-        TimelineDragOverlay(dragController)
-    }
-}
-
-@Composable
-internal fun DaySuccess(
-    state: DayUiState.Success,
-    scrollState: ScrollState,
-    allDayHeight: Dp,
-    dragController: TimelineDragController,
-    onEventClick: (EventInstance) -> Unit,
-    onCreateAt: (LocalDate, Int) -> Unit,
-    onDrop: (TimelineDrop) -> Unit,
-) {
-    Column(modifier = Modifier.fillMaxSize()) {
-        // All-day strip collapses to nothing when the day has no all-day events,
-        // so the timeline sits directly under the app bar.
-        // This strip is painted on `surface`, so an outlined chip has to fill
-        // with that and not with the column's container (#230).
-        CompositionLocalProvider(
-            LocalChipGround provides MaterialTheme.colorScheme.surface,
-        ) {
-            AllDayStrip(
-                state = state,
-                height = allDayHeight,
-                onEventClick = onEventClick,
-                modifier = Modifier
-                    .fillMaxWidth()
-                    .background(MaterialTheme.colorScheme.surface),
-            )
-        }
-        // Breathing room between the top section and the scrolling timeline
-        // below.
-        Spacer(Modifier.height(8.dp))
-        Timeline(
-            state = state,
-            scrollState = scrollState,
-            dragController = dragController,
-            onEventClick = onEventClick,
-            onCreateAt = onCreateAt,
-            onDrop = onDrop,
-        )
-    }
-}
-
-@OptIn(ExperimentalMaterial3Api::class)
-@Composable
-private fun DayTopBar(
-    date: LocalDate,
-    currentYear: Int,
-    selectedView: CalendarView,
-    onCycleView: () -> Unit,
-    quickSwitchViews: List<CalendarView>,
-    onOpenDrawer: () -> Unit,
-    onOpenSearch: () -> Unit,
-    onJumpToDate: (LocalDate) -> Unit,
-    showTodayButton: Boolean,
-    onToday: () -> Unit,
-) {
-    val locale = currentLocale()
-    val (title, shortTitle) = remember(date, locale, currentYear) {
-        formatDayTitle(date, locale, currentYear) to
-            formatDayTitle(date, locale, currentYear, abbreviated = true)
-    }
-    TopAppBar(
-        title = {
-            CalendarTitleButton(
-                title = title,
-                currentDate = date,
-                onJumpToDate = onJumpToDate,
-                shortTitle = shortTitle,
-            )
-        },
-        navigationIcon = {
-            IconButton(onClick = onOpenDrawer) {
-                Icon(
-                    imageVector = Icons.Default.Menu,
-                    contentDescription = stringResource(R.string.month_open_menu),
-                )
-            }
-        },
-        actions = {
-            TodayAction(show = showTodayButton, onToday = onToday)
-            IconButton(onClick = onOpenSearch) {
-                Icon(
-                    imageVector = Icons.Default.Search,
-                    contentDescription = stringResource(R.string.search_action),
-                )
-            }
-            ViewSwitcherPill(
-                current = selectedView,
-                cycle = quickSwitchViews,
-                onCycle = onCycleView,
-            )
-        },
-        // Deliberately flat: M3 lifts the bar to mark content scrolling under
-        // it, but here the bar meets the header on the same surface and the
-        // tint is what makes that seam look like a separate block (#186).
-        colors = TopAppBarDefaults.topAppBarColors(
-            containerColor = MaterialTheme.colorScheme.surface,
-            scrolledContainerColor = MaterialTheme.colorScheme.surface,
-        ),
-    )
-}
-
-@Composable
-private fun AllDayStrip(
-    state: DayUiState.Success,
-    height: Dp,
-    onEventClick: (EventInstance) -> Unit,
-    modifier: Modifier = Modifier,
-) {
-    val dark = isSystemInDarkTheme()
-
-    Row(
-        modifier = modifier
-            // Height is hoisted + animated so it resizes smoothly; padding sits
-            // inside it so the content area is lanes * row height.
-            .height(height)
-            .padding(
-                top = ALL_DAY_VERTICAL_PADDING,
-                bottom = ALL_DAY_VERTICAL_PADDING,
-                end = TIMELINE_CONTENT_END_INSET,
-            ),
-    ) {
-        // Keep the gutter-width offset so the bars line up with the day column.
-        Spacer(Modifier.width(GUTTER_WIDTH))
-        // Bars are positioned absolutely by lane (vertical stacking); each spans
-        // the full day-column width. clipToBounds keeps bars from spilling out
-        // while the height animates.
-        BoxWithConstraints(
-            modifier = Modifier
-                .weight(1f)
-                .fillMaxHeight()
-                .clipToBounds(),
-        ) {
-            val barWidth = maxWidth
-            state.allDay.forEach { span ->
-                AllDayBar(
-                    event = span.event,
-                    dark = dark,
-                    onClick = { onEventClick(span.event) },
-                    modifier = Modifier
-                        .offset(y = ALL_DAY_ROW_HEIGHT * span.lane)
-                        .width(barWidth)
-                        .height(ALL_DAY_ROW_HEIGHT)
-                        .padding(horizontal = 1.dp, vertical = 1.dp),
-                )
-            }
-        }
-    }
-}
-
-@Composable
-private fun AllDayBar(
-    event: EventInstance,
-    dark: Boolean,
-    onClick: () -> Unit,
-    modifier: Modifier = Modifier,
-) {
-    val title = event.title.ifBlank { stringResource(R.string.event_untitled) }
-    val paint = eventPaint(event, dark)
-    Box(
-        modifier = modifier
-            .eventSurface(paint, EventChipShape)
-            .clickable(onClick = onClick)
-            .padding(horizontal = 6.dp, vertical = 2.dp)
-            .semantics { contentDescription = title },
-        contentAlignment = Alignment.CenterStart,
-    ) {
-        val titleOverflow = eventTitleOverflow()
-        Text(
-            text = title,
-            style = MaterialTheme.typography.labelSmall.trimmedLines(),
-            maxLines = 1,
-            overflow = titleOverflow.overflow,
-            softWrap = titleOverflow.softWrap,
-            color = paint.titleInk,
-            fontWeight = paint.titleWeight,
-            textDecoration = paint.decoration,
-        )
-    }
-}
-
-@Composable
-private fun Timeline(
-    state: DayUiState.Success,
-    scrollState: ScrollState,
-    dragController: TimelineDragController,
-    onEventClick: (EventInstance) -> Unit,
-    onCreateAt: (LocalDate, Int) -> Unit,
-    onDrop: (TimelineDrop) -> Unit,
-) {
-    val dark = isSystemInDarkTheme()
-    val zoom = LocalTimelineZoom.current
-    val density = LocalDensity.current
-    val isRtl = LocalLayoutDirection.current == LayoutDirection.Rtl
-    // What the hour grid takes off a block's ends, for the floating copy to
-    // take off its own. Per-end, a cut edge keeps it — that much the drag
-    // geometry decides itself, from the slice it is drawing.
-    val blockInsetPx = with(density) {
-        hourCellBlockInset(LocalShowHourGrid.current, cut = false).toPx()
-    }
-
-    // BoxWithConstraints rather than Box: the fit-the-whole-day scale needs the
-    // timeline's own viewport height, which is only known here — below the top
-    // bar, date header and all-day strip.
-    BoxWithConstraints(modifier = Modifier.fillMaxSize()) {
-        val hourHeight = zoom.scale.hourHeight(maxHeight)
-        val totalHeight = hourHeight * 24
-        // The pinch sits on the Row, above both scroll viewports: it has to
-        // outrank the vertical scroll, and it does that by watching the initial
-        // pass, which only reaches it if it is their ancestor.
-        val pinch = rememberTimelinePinchZoom(scrollState, maxHeight, hourHeight, zoom)
-        // Gutter and day column are two scroll viewports that SHARE one scroll
-        // state, so they stay perfectly aligned. The day-column viewport is a
-        // static, rounded-clipped window — the content scrolls inside it, so the
-        // soft corners are permanent at any scroll position.
-        Row(modifier = Modifier.fillMaxSize().then(pinch)) {
-            // Hour gutter (scrolls in sync with the day column). Start inset so the
-            // labels centre on the top bar hamburger, matching the week view.
-            HourGutter(
-                scrollState = scrollState,
-                hourHeight = hourHeight,
-                dragController = dragController,
-            )
-            // Day column: rounded, clipped scroll viewport (permanent corners).
-            Box(
-                modifier = Modifier
-                    .weight(1f)
-                    .fillMaxHeight()
-                    .padding(end = TIMELINE_CONTENT_END_INSET)
-                    .clip(RoundedCornerShape(16.dp))
-                    .verticalScroll(scrollState)
-                    .onGloballyPositioned { dragController.geometry.viewport = it },
-            ) {
-                DayColumnCard(
-                    blocks = state.timed,
-                    dark = dark,
-                    date = state.date,
-                    today = state.today,
-                    hourHeight = hourHeight,
-                    dragController = dragController,
-                    onEventClick = onEventClick,
-                    onCreateAt = onCreateAt,
-                    onDrop = onDrop,
-                    modifier = Modifier
-                        .fillMaxWidth()
-                        .height(totalHeight)
-                        // The scrolling content itself, so its root position
-                        // already folds in the scroll offset.
-                        .onGloballyPositioned { coords ->
-                            dragController.geometry.let {
-                                it.grid = coords
-                                it.scroll = scrollState
-                                it.hourPx = with(density) { hourHeight.toPx() }
-                                it.blockInsetPx = blockInsetPx
-                                it.columnGapPx = 0f
-                                it.columnWidthPx = coords.size.width.toFloat()
-                                it.days = listOf(state.date)
-                                it.isRtl = isRtl
-                            }
-                        },
-                )
-            }
-        }
-    }
-}
-
-@Composable
-private fun DayColumnCard(
-    blocks: List<TimedBlock>,
-    dark: Boolean,
-    date: LocalDate,
-    today: LocalDate,
-    hourHeight: Dp,
-    dragController: TimelineDragController,
-    onEventClick: (EventInstance) -> Unit,
-    onCreateAt: (LocalDate, Int) -> Unit,
-    onDrop: (TimelineDrop) -> Unit,
-    modifier: Modifier = Modifier,
-) {
-    val hourPx = with(LocalDensity.current) { hourHeight.toPx() }
-    val showHourGrid = LocalShowHourGrid.current
-    val zone = remember { TimeZone.currentSystemDefault() }
-    // Tells a settled drop when this column has caught up with it.
-    LaunchedEffect(blocks, dragController.settling) {
-        dragController.noteGrid(date, blocks)
-    }
-    // The tap detector outlives the composition that installed it — a pinch or a
-    // Settings change moves the hour height without restarting it — so it reads
-    // the height and the callback through state handles instead of capturing
-    // them, or taps land on the scale the column had before the zoom (#148).
-    val currentHourPx = rememberUpdatedState(hourPx)
-    val currentOnCreateAt = rememberUpdatedState(onCreateAt)
-    Card(
-        // Plain rectangular column — the soft corners come from the outer
-        // rounded scroll viewport, so inner rounding would look odd at the edges.
-        shape = RectangleShape,
-        colors = CardDefaults.cardColors(
-            // With the grid on, the container colour moves onto the hour cells
-            // and the column behind them recedes to surface, so an hour boundary
-            // reads as negative space between two surfaces.
-            containerColor = if (showHourGrid) {
-                MaterialTheme.colorScheme.surface
-            } else {
-                MaterialTheme.colorScheme.surfaceContainer
-            },
-        ),
-        modifier = modifier,
-    ) {
-        BoxWithConstraints(
-            modifier = Modifier
-                .fillMaxSize()
-                // The hour cells sit over the column background but under the
-                // event blocks (drawBehind paints before the children).
-                .hourGridCells(showHourGrid, hourPx, MaterialTheme.colorScheme.surfaceContainer)
-                // Tap an empty slot to create an event there. Taps on event
-                // blocks are consumed by their own click handler first, so this
-                // only fires on the column background. Snaps to the tapped hour.
-                .pointerInput(date) {
-                    detectTapGestures { offset ->
-                        currentOnCreateAt.value(
-                            date,
-                            tappedMinuteOfDay(offset.y, currentHourPx.value),
-                        )
-                    }
-                },
-        ) {
-            val colWidth = maxWidth
-            val minEventHeight = hourHeight * MIN_EVENT_FRACTION
-            // Keyed by event, so a block that changes time or lane is the *same*
-            // composable afterwards and tweens there. The ordinal disambiguates
-            // a column holding two occurrences of one series.
-            val ordinals = mutableMapOf<Long, Int>()
-            blocks.forEach { block ->
-                val ordinal = ordinals.merge(block.event.eventId, 1, Int::plus)!! - 1
-                key(block.event.eventId, ordinal) {
-                    val laneWidth = colWidth / block.laneCount
-                    val top = hourHeight * (block.startMin / 60f)
-                    val rawHeight = hourHeight * ((block.endMin - block.startMin) / 60f)
-                    val height = if (rawHeight < minEventHeight) minEventHeight else rawHeight
-                    val place = animatedBlockPlacement(
-                        x = laneWidth * block.lane,
-                        y = top,
-                        width = laneWidth,
-                        height = height,
-                    )
-                    // Where this block is cut at midnight, which decides both
-                    // its shape and the half-gap it gives up to the hour cells.
-                    val cuts = remember(block, date, zone) {
-                        timedBlockCuts(
-                            block.continuesBefore(date, zone),
-                            block.continuesAfter(date, zone),
-                        )
-                    }
-                    val topInset = hourCellBlockInset(showHourGrid, cuts.top)
-                    val bottomInset = hourCellBlockInset(showHourGrid, cuts.bottom)
-                    val blockHeight = (place.height - topInset - bottomInset)
-                        .coerceAtLeast(0.dp)
-                    EventBlock(
-                        block = block,
-                        dark = dark,
-                        height = blockHeight,
-                        width = place.width,
-                        date = date,
-                        cuts = cuts,
-                        topInset = topInset,
-                        dragController = dragController,
-                        onClick = { onEventClick(block.event) },
-                        onDrop = onDrop,
-                        modifier = Modifier
-                            .offset(x = place.x, y = place.y + topInset)
-                            .width(place.width)
-                            .height(blockHeight)
-                            .padding(horizontal = BLOCK_OUTER_INSET),
-                    )
-                }
-            }
-            // Current-time line, on top of the events, only on today's column.
-            if (date == today) {
-                NowLine(date = date, hourHeight = hourHeight)
-            }
-        }
-    }
-}
-
-@Composable
-private fun EventBlock(
-    block: TimedBlock,
-    dark: Boolean,
-    height: Dp,
-    width: Dp,
-    date: LocalDate,
-    cuts: ChipCuts,
-    topInset: Dp,
-    dragController: TimelineDragController,
-    onClick: () -> Unit,
-    onDrop: (TimelineDrop) -> Unit,
-    modifier: Modifier = Modifier,
-) {
-    val title = block.event.title.ifBlank { stringResource(R.string.event_untitled) }
-    val use24Hour = LocalUse24HourFormat.current
-    val locale = currentLocale()
-    val timeLabel = "${minToHm(block.startMin, use24Hour, locale)}–" +
-        minToHm(block.endMin, use24Hour, locale)
-    val density = LocalDensity.current
-    val metrics = rememberBlockTextMetrics(height)
-    // A block that cannot afford both lines spends its space on the title, and
-    // one too short even for that drops the title rather than serving a sliced one.
-    // Height alone decides: a duration threshold would keep hiding the time on a
-    // half-hour block the user has pinched open to three times the room it needs.
-    val showTime = metrics.available >= metrics.titleLine + metrics.timeLine
-    val showTitle = metrics.fitsTitle
-    val textWidth = width - (BLOCK_OUTER_INSET + BLOCK_TEXT_PADDING) * 2
-    // Only lines the block can actually draw: a block too short for the time is
-    // too short for a second title line too, and asking for one served a sliced
-    // one — as well as handing the drag copy a count it couldn't honour, so the
-    // title re-wrapped the moment the block was lifted (#267).
-    val titleBudget = metrics.titleBudget(metrics.available).coerceAtLeast(1)
-    val titleMaxLines = if (showTime) 1 else titleBudget.coerceAtMost(2)
-    // On a day column — wide enough for "09:30–11:00" several times over — the
-    // range never needs the second line, until lanes cut the column down.
-    val spare = metrics.available - metrics.titleHeight(titleMaxLines) -
-        if (showTime) metrics.timeLine else 0.dp
-    val timeMaxLines = if (showTime) blockTimeLines(timeLabel, textWidth, spare) else 1
-    val paint = eventPaint(block.event, dark)
-    val zone = remember { TimeZone.currentSystemDefault() }
-    val moveAction = eventMoveAction(block.event)
-    val draggable = eventDragAllowed(block.event)
-    // The drop takes this offset back off, so a tail clipped at midnight lands
-    // where the event's own start belongs (#253).
-    val clipOffset = remember(block, date, zone) { block.clipOffsetMinutes(date, zone) }
-    val shape = remember(cuts) { timedBlockShape(cuts.top, cuts.bottom) }
-    val topInsetPx = with(density) { topInset.toPx() }
-    val dragModifier = rememberEventDragSource(
-        enabled = draggable,
-        key = block.event.instanceId,
-        onPickUp = { pointer, blockRoot, _ ->
-            dragController.begin(
-                block = block,
-                clipOffsetMin = clipOffset,
-                titleLines = if (showTitle) titleMaxLines else 0,
-                pointerInRoot = pointer,
-                // Measured off the block's placement rather than off where the
-                // hour grid seats it: the copy is drawn from that placement and
-                // re-seated the same half-gap down (#267).
-                blockInRoot = blockRoot.copy(y = blockRoot.y - topInsetPx),
-            )
-        },
-        onMove = dragController::move,
-        onDrop = { dragController.finish()?.let(onDrop) },
-        onCancel = dragController::cancel,
-    )
-    val lifted = draggable && dragController.ghosts(block)
-    val ghost = ghostAlpha(lifted)
-    Box(
-        modifier = modifier
-            // The source stays put as a ghost while its floating copy travels.
-            .then(if (ghost < 1f) Modifier.alpha(ghost) else Modifier)
-            .eventSurface(paint, shape, cuts)
-            .clickable(onClick = onClick)
-            // After clickable, so it is the inner node and wins the main pass;
-            // the tap still works, since a drag consumes the up.
-            .then(dragModifier)
-            .padding(horizontal = BLOCK_TEXT_PADDING, vertical = metrics.inset)
-            .semantics {
-                contentDescription = "$title, $timeLabel"
-                if (moveAction != null) customActions = listOf(moveAction)
-            },
-    ) {
-        Column {
-            if (showTitle) {
-                BlockTitle(
-                    title = title,
-                    maxLines = titleMaxLines,
-                    color = paint.titleInk,
-                    textDecoration = paint.decoration,
-                    fontWeight = paint.titleWeight,
-                )
-            }
-            if (showTime) {
-                BlockTimeLabel(
-                    label = timeLabel,
-                    color = paint.secondaryInk,
-                    maxLines = timeMaxLines,
-                )
-            }
-        }
-    }
-}
-
-@Composable
-private fun DayLoading() {
-    val scale = LocalTimelineZoom.current.scale
-    val scrollState = rememberScrollState()
-    BoxWithConstraints(modifier = Modifier.fillMaxSize()) {
-        // Same scale resolution as the loaded timeline, so the skeleton's column
-        // doesn't resize the moment the real day arrives.
-        val hourHeight = scale.hourHeight(maxHeight)
-        val totalHeight = hourHeight * 24
-        // The skeleton wears the loaded column's own ground, so the arrival of
-        // the real day doesn't flash a solid block into a gapped grid.
-        val showHourGrid = LocalShowHourGrid.current
-        val hourPx = with(LocalDensity.current) { hourHeight.toPx() }
-        Row(
-            modifier = Modifier
-                .fillMaxSize()
-                .padding(end = TIMELINE_CONTENT_END_INSET)
-                .verticalScroll(scrollState),
-        ) {
-            Spacer(Modifier.width(GUTTER_WIDTH))
-            Box(
-                modifier = Modifier
-                    .weight(1f)
-                    .height(totalHeight)
-                    .padding(horizontal = 2.dp)
-                    .background(
-                        if (showHourGrid) MaterialTheme.colorScheme.surface
-                        else MaterialTheme.colorScheme.surfaceContainer,
-                    )
-                    .hourGridCells(showHourGrid, hourPx, MaterialTheme.colorScheme.surfaceContainer),
-            )
-        }
-    }
-}
-
-private fun minToHm(min: Int, is24Hour: Boolean, locale: Locale): String =
-    formatMinuteOfDay(min, is24Hour, locale)
-
-/** [abbreviated] drops the weekday, leaving the date itself (#165). */
-private fun formatDayTitle(
-    date: LocalDate,
-    locale: Locale,
-    currentYear: Int,
-    abbreviated: Boolean = false,
-): String =
-    formatCalendarTitle(
-        date = java.time.LocalDate.of(date.year, date.month.ordinal + 1, date.day),
-        locale = locale,
-        currentYear = currentYear,
-        skeleton = if (abbreviated) "dMMM" else "EEEdMMM",
-    )

app/src/main/java/de/jeanlucmakiola/calendula/ui/day/DayUiState.kt

@@ -1,25 +0,0 @@
-package de.jeanlucmakiola.calendula.ui.day
-
-import de.jeanlucmakiola.calendula.domain.FailureReason
-import de.jeanlucmakiola.calendula.ui.week.AllDaySpan
-import de.jeanlucmakiola.calendula.ui.week.TimedBlock
-import kotlinx.datetime.LocalDate
-
-/**
- * The day view is a single-column slice of the week view (spec S3). It reuses the
- * week's [TimedBlock] and [AllDaySpan] layout primitives — for one day, all-day
- * spans collapse to a single column ([AllDaySpan.startCol] == [AllDaySpan.endCol]
- * == 0) and only their [AllDaySpan.lane] (vertical stacking) matters.
- */
-sealed interface DayUiState {
-    data object Loading : DayUiState
-    data class Failure(val reason: FailureReason) : DayUiState
-    data class Success(
-        val date: LocalDate,
-        val today: LocalDate,
-        /** All-day/multi-day events covering this day, stacked by lane. */
-        val allDay: List<AllDaySpan>,
-        /** Timed events clipped to this day with overlap lanes resolved. */
-        val timed: List<TimedBlock>,
-    ) : DayUiState
-}

app/src/main/java/de/jeanlucmakiola/calendula/ui/day/DayViewModel.kt

@@ -1,110 +0,0 @@
-package de.jeanlucmakiola.calendula.ui.day
-
-import androidx.lifecycle.ViewModel
-import androidx.lifecycle.viewModelScope
-import dagger.hilt.android.lifecycle.HiltViewModel
-import de.jeanlucmakiola.calendula.data.calendar.CalendarRepository
-import de.jeanlucmakiola.calendula.data.di.IoDispatcher
-import de.jeanlucmakiola.calendula.domain.CalendarSource
-import de.jeanlucmakiola.calendula.domain.EventInstance
-import de.jeanlucmakiola.calendula.domain.FailureReason
-import de.jeanlucmakiola.calendula.domain.calendarListFailure
-import de.jeanlucmakiola.calendula.ui.week.layoutAllDay
-import de.jeanlucmakiola.calendula.ui.week.layoutDay
-import kotlinx.coroutines.CoroutineDispatcher
-import kotlinx.coroutines.ExperimentalCoroutinesApi
-import kotlinx.coroutines.flow.MutableStateFlow
-import kotlinx.coroutines.flow.SharingStarted
-import kotlinx.coroutines.flow.StateFlow
-import kotlinx.coroutines.flow.catch
-import kotlinx.coroutines.flow.combine
-import kotlinx.coroutines.flow.flatMapLatest
-import kotlinx.coroutines.flow.flowOn
-import kotlinx.coroutines.flow.stateIn
-import kotlinx.datetime.DateTimeUnit
-import kotlinx.datetime.LocalDate
-import kotlinx.datetime.TimeZone
-import kotlinx.datetime.atStartOfDayIn
-import kotlinx.datetime.atTime
-import kotlinx.datetime.minus
-import kotlinx.datetime.plus
-import kotlinx.datetime.toInstant
-import kotlinx.datetime.toLocalDateTime
-import kotlin.time.Clock
-import kotlin.time.Instant
-import javax.inject.Inject
-
-@OptIn(ExperimentalCoroutinesApi::class)
-@HiltViewModel
-class DayViewModel @Inject constructor(
-    private val repository: CalendarRepository,
-    @IoDispatcher private val io: CoroutineDispatcher,
-) : ViewModel() {
-
-    private val zone = TimeZone.currentSystemDefault()
-
-    private val todayDate: LocalDate
-        get() = Clock.System.now().toLocalDateTime(zone).date
-
-    private val _date = MutableStateFlow(todayDate)
-    val date: StateFlow<LocalDate> = _date
-
-    val state: StateFlow<DayUiState> = _date
-        .flatMapLatest { day ->
-            val range = dayRange(day, zone)
-            combine(
-                repository.calendars(),
-                repository.instances(range),
-            ) { calendars, instances ->
-                buildState(day, calendars, instances)
-            }
-        }
-        .catch { emit(DayUiState.Failure(FailureReason.ProviderUnavailable)) }
-        .flowOn(io)
-        .stateIn(
-            scope = viewModelScope,
-            started = SharingStarted.WhileSubscribed(5_000L),
-            initialValue = DayUiState.Loading,
-        )
-
-    fun goToPrev() {
-        _date.value = _date.value.minus(1, DateTimeUnit.DAY)
-    }
-
-    fun goToNext() {
-        _date.value = _date.value.plus(1, DateTimeUnit.DAY)
-    }
-
-    fun goToToday() {
-        _date.value = todayDate
-    }
-
-    /** Jump to a specific date (e.g. when opened from the month grid). */
-    fun goToDate(date: LocalDate) {
-        _date.value = date
-    }
-
-    private fun buildState(
-        day: LocalDate,
-        calendars: List<CalendarSource>,
-        instances: List<EventInstance>,
-    ): DayUiState {
-        calendarListFailure(calendars)?.let { return DayUiState.Failure(it) }
-        val days = listOf(day)
-        val allDay = instances.filter { it.isAllDay }
-        val timed = instances.filterNot { it.isAllDay }
-        return DayUiState.Success(
-            date = day,
-            today = todayDate,
-            allDay = layoutAllDay(allDay, days, zone),
-            timed = layoutDay(timed, day, zone),
-        )
-    }
-}
-
-/** Half-open instant range covering the single calendar [date]. */
-internal fun dayRange(date: LocalDate, zone: TimeZone): ClosedRange<Instant> {
-    val from = date.atStartOfDayIn(zone)
-    val to = date.atTime(23, 59, 59).toInstant(zone)
-    return from..to
-}

app/src/main/java/de/jeanlucmakiola/calendula/ui/day/DayViewPreview.kt

@@ -1,63 +0,0 @@
-package de.jeanlucmakiola.calendula.ui.day
-
-import androidx.compose.foundation.rememberScrollState
-import androidx.compose.runtime.Composable
-import androidx.compose.runtime.LaunchedEffect
-import androidx.compose.runtime.remember
-import androidx.compose.runtime.snapshotFlow
-import androidx.compose.ui.Modifier
-import androidx.compose.ui.unit.Dp
-import de.jeanlucmakiola.calendula.ui.common.ScaledViewPreview
-import de.jeanlucmakiola.calendula.ui.common.rememberTimelineDragController
-import de.jeanlucmakiola.calendula.ui.common.sampleTimelineEvents
-import de.jeanlucmakiola.calendula.ui.week.layoutAllDay
-import de.jeanlucmakiola.calendula.ui.week.layoutDay
-import kotlinx.coroutines.flow.first
-import kotlinx.datetime.LocalDate
-import kotlinx.datetime.TimeZone
-import kotlinx.datetime.toLocalDateTime
-import kotlin.time.Clock
-
-/**
- * A live, scaled-down Day view for the onboarding view chooser. Today's date is
- * real; only the events are stand-ins.
- */
-@Composable
-internal fun DayViewPreview(
-    height: Dp,
-    modifier: Modifier = Modifier,
-) {
-    val zone = remember { TimeZone.currentSystemDefault() }
-    val today = remember(zone) { Clock.System.now().toLocalDateTime(zone).date }
-    val state = remember(today, zone) { sampleDayState(today, zone) }
-    val scrollState = rememberScrollState()
-    LaunchedEffect(Unit) {
-        snapshotFlow { scrollState.maxValue }.first { it > 0 }
-        // Half the scroll range is noon — the same centring the live view does.
-        scrollState.scrollTo(scrollState.maxValue / 2)
-    }
-
-    ScaledViewPreview(height = height, modifier = modifier) {
-        DaySuccess(
-            state = state,
-            scrollState = scrollState,
-            allDayHeight = state.allDayStripHeight(),
-            dragController = rememberTimelineDragController(),
-            onEventClick = {},
-            onCreateAt = { _, _ -> },
-            onDrop = {},
-        )
-    }
-}
-
-/** Sample day state, laid out through the same helpers the live view uses. */
-private fun sampleDayState(today: LocalDate, zone: TimeZone): DayUiState.Success {
-    val days = listOf(today)
-    val events = sampleTimelineEvents(days, today, zone)
-    return DayUiState.Success(
-        date = today,
-        today = today,
-        allDay = layoutAllDay(events.filter { it.isAllDay }, days, zone),
-        timed = layoutDay(events, today, zone),
-    )
-}

app/src/main/java/de/jeanlucmakiola/calendula/ui/detail/EventDetailScreen.kt

@@ -140,6 +140,7 @@ fun EventDetailScreen(
     onBack: () -> Unit,
     onEdit: () -> Unit,
     onDuplicate: (EventForm) -> Unit,
+    visible: Boolean = true,
     viewModel: EventDetailViewModel = hiltViewModel(),
 ) {
     LaunchedEffect(eventId, beginMillis, endMillis) {
@@ -227,7 +228,7 @@ fun EventDetailScreen(
     }
 
     Scaffold(
-        modifier = Modifier.predictiveBack(onBack = onBack),
+        modifier = Modifier.predictiveBack(onBack = onBack, visible = visible),
         snackbarHost = { SnackbarHost(snackbarHostState) },
         topBar = {
             TopAppBar(

app/src/main/java/de/jeanlucmakiola/calendula/ui/edit/EventEditScreen.kt

@@ -203,6 +203,7 @@ fun EventEditScreen(
     initialForm: EventForm? = null,
     initialFormSource: ImportSource = ImportSource.File,
     onManageCalendars: (() -> Unit)? = null,
+    visible: Boolean = true,
     viewModel: EventEditViewModel = hiltViewModel(),
 ) {
     LaunchedEffect(initialDateIso, editKey, initialForm) {
@@ -285,7 +286,7 @@ fun EventEditScreen(
     }
 
     Scaffold(
-        modifier = Modifier.predictiveBack(onBack = close),
+        modifier = Modifier.predictiveBack(onBack = close, visible = visible),
         snackbarHost = { SnackbarHost(snackbarHostState) },
         topBar = {
             TopAppBar(

app/src/main/java/de/jeanlucmakiola/calendula/ui/imports/ImportScreen.kt

@@ -78,6 +78,7 @@ fun ImportScreen(
     onOpenSingle: (EventForm) -> Unit,
     forceMany: Boolean = false,
     onManageCalendars: (() -> Unit)? = null,
+    visible: Boolean = true,
     viewModel: ImportViewModel = hiltViewModel(),
 ) {
     // hiltViewModel() resolves to the Activity's store and is retained across
@@ -103,7 +104,7 @@ fun ImportScreen(
 
     Scaffold(
         modifier = Modifier
-            .predictiveBack(onBack = onClose)
+            .predictiveBack(onBack = onClose, visible = visible)
             .fillMaxSize(),
         topBar = {
             TopAppBar(

app/src/main/java/de/jeanlucmakiola/calendula/ui/licences/LicencesScreen.kt

@@ -23,13 +23,14 @@ import de.jeanlucmakiola.floret.components.positionOf
  * what the *recipient of the binary* is told. Each row opens the project's source.
  */
 @Composable
-internal fun LicencesScreen(onBack: () -> Unit) {
+internal fun LicencesScreen(onBack: () -> Unit, visible: Boolean = true) {
     val uriHandler = LocalUriHandler.current
 
     CollapsingScaffold(
         title = stringResource(R.string.licences_title),
         onBack = onBack,
         predictiveBack = true,
+        visible = visible,
     ) {
         Text(
             stringResource(R.string.licences_intro),

app/src/main/java/de/jeanlucmakiola/calendula/ui/month/MonthViewModel.kt

@@ -11,7 +11,9 @@ import de.jeanlucmakiola.calendula.domain.CalendarSource
 import de.jeanlucmakiola.calendula.domain.EventInstance
 import de.jeanlucmakiola.calendula.domain.FailureReason
 import de.jeanlucmakiola.calendula.domain.calendarListFailure
+import de.jeanlucmakiola.calendula.ui.common.PageStateCache
 import de.jeanlucmakiola.calendula.domain.isDeclined
+import de.jeanlucmakiola.calendula.domain.eventDisplayComparator
 import de.jeanlucmakiola.calendula.ui.week.coversDay
 import de.jeanlucmakiola.calendula.ui.week.layoutAllDay
 import de.jeanlucmakiola.calendula.ui.week.spansMultipleDays
@@ -25,6 +27,9 @@ import kotlinx.coroutines.flow.combine
 import kotlinx.coroutines.flow.flatMapLatest
 import kotlinx.coroutines.flow.flowOf
 import kotlinx.coroutines.flow.flowOn
+import kotlinx.coroutines.flow.filterNot
+import kotlinx.coroutines.flow.map
+import kotlin.math.abs
 import kotlinx.coroutines.flow.onEach
 import kotlinx.coroutines.flow.stateIn
 import kotlinx.datetime.DateTimeUnit
@@ -44,6 +49,9 @@ import kotlin.time.Clock
 import kotlin.time.Instant
 import javax.inject.Inject
 
+/** How many months either side of the requested one [MonthViewModel.month] keeps cached. */
+private const val MONTH_CACHE_SPAN = 2
+
 @OptIn(ExperimentalCoroutinesApi::class)
 @HiltViewModel
 class MonthViewModel @Inject constructor(
@@ -87,6 +95,21 @@ class MonthViewModel @Inject constructor(
     private val _month = MutableStateFlow(YearMonth(todayDate.year, todayDate.month))
     val month: StateFlow<YearMonth> = _month
 
+    /** The pager page the anchor month sits on, for the paged and split styles. */
+    val anchorPage: StateFlow<Int> = _month
+        .map { monthIndexOf(it) }
+        .stateIn(
+            scope = viewModelScope,
+            started = SharingStarted.WhileSubscribed(5_000L),
+            initialValue = monthIndexOf(_month.value),
+        )
+
+    /**
+     * The anchor month's state. Once loaded it never falls back to
+     * [MonthUiState.Loading]: moving the anchor keeps the last result until the
+     * new month arrives, since the pages draw their own months and this feeds
+     * the failure screen and the split style's day pane.
+     */
     val state: StateFlow<MonthUiState> =
         combine(_month, weekStart, viewStyle) { ym, ws, style -> Triple(ym, ws, style) }
             .flatMapLatest { (ym, ws, style) ->
@@ -94,22 +117,48 @@ class MonthViewModel @Inject constructor(
                 // Split draw, so under a scrolling style this query is a month
                 // of provider work for a view that isn't on screen.
                 if (style.isScrolling) return@flatMapLatest flowOf(MonthUiState.Loading)
-                val range = monthGridRange(ym, ws, zone)
+                month(ym, ws).filterNot { it is MonthUiState.Loading }
-                combine(
-                    repository.calendars(),
-                    repository.instances(range),
-                ) { calendars, instances ->
-                    buildState(ym, ws, calendars, instances)
-                }
             }
             .catch { emit(MonthUiState.Failure(FailureReason.ProviderUnavailable)) }
-            .flowOn(io)
             .stateIn(
                 scope = viewModelScope,
                 started = SharingStarted.WhileSubscribed(5_000L),
                 initialValue = MonthUiState.Loading,
             )
 
+    private val months = PageStateCache<Pair<YearMonth, DayOfWeek>, MonthUiState>(
+        scope = viewModelScope,
+        initial = MonthUiState.Loading,
+        // Far enough to cover the pages either side and a swipe back, so paging
+        // through a year doesn't keep a year of queries around. A week-start
+        // change lays every month out afresh.
+        keep = { (cached, cachedWs), (requested, ws) ->
+            cachedWs == ws && abs(monthIndexOf(cached) - monthIndexOf(requested)) <= MONTH_CACHE_SPAN
+        },
+    ) { (ym, ws) ->
+        combine(
+            repository.calendars(),
+            repository.instances(monthGridRange(ym, ws, zone)),
+        ) { calendars, instances ->
+            buildState(ym, ws, calendars, instances)
+        }
+            .catch { emit(MonthUiState.Failure(FailureReason.ProviderUnavailable)) }
+            .flowOn(io)
+    }
+
+    /**
+     * Month [ym] laid out with weeks starting on [ws], shared between its pager
+     * page and [state]. Main thread only.
+     */
+    fun month(ym: YearMonth, ws: DayOfWeek): StateFlow<MonthUiState> = months.get(ym to ws)
+
+    /** The pager came to rest on [page]; follow it unless it is already the anchor's. */
+    fun onPageSettled(page: Int) {
+        if (monthIndexOf(_month.value) == page) return
+        _month.value = yearMonthForIndex(page)
+        realignSelection()
+    }
+
     // --- Continuous + Dense styles (#38) ----------------------------------
     //
     // These scroll through every month there is, so they can't load "a month" —
@@ -244,12 +293,10 @@ class MonthViewModel @Inject constructor(
 
     // --- Split style (#53) ------------------------------------------------
     //
-    // The first selected-day concept in the app: the other views drill straight
+    // Null means the full-month agenda; a date narrows the pane to that day.
-    // into a date, while the split style keeps one selected and lists it below
-    // the grid.
 
-    private val _selectedDate = MutableStateFlow(todayDate)
+    private val _selectedDate = MutableStateFlow<LocalDate?>(null)
-    val selectedDate: StateFlow<LocalDate> = _selectedDate
+    val selectedDate: StateFlow<LocalDate?> = _selectedDate
 
     /**
      * Select [date], following it to its month if it sits in the grid's leading
@@ -257,33 +304,33 @@ class MonthViewModel @Inject constructor(
      * silently list a date the grid isn't pointing at.
      */
     fun selectDate(date: LocalDate) {
-        _selectedDate.value = date
         val target = YearMonth(date.year, date.month)
+        _selectedDate.value = if (target == _month.value && _selectedDate.value == date) null else date
         if (target != _month.value) _month.value = target
     }
 
-    /**
+    fun clearSelection() { _selectedDate.value = null }
-     * Move the selection with the month: today if the new month holds it, else
+
-     * its 1st. Leaving the old date selected would list a day the grid no longer
+    /** A pane swipe walks days when filtered, months when showing the agenda. */
-     * shows.
+    fun stepSplitPane(days: Int) {
-     */
+        val selected = _selectedDate.value
+        if (selected == null) {
+            _month.value = yearMonthForIndex(monthIndexOf(_month.value) + days)
+        } else {
+            val next = selected.plus(days, DateTimeUnit.DAY)
+            _selectedDate.value = next
+            _month.value = YearMonth(next.year, next.month)
+        }
+    }
+
+    /** Moving the grid to another month restores its full agenda. */
     private fun realignSelection() {
-        _selectedDate.value = selectionForMonth(_month.value, todayDate)
+        _selectedDate.value = null
-    }
-
-    fun goToPrev() {
-        _month.value = _month.value.minus(1, DateTimeUnit.MONTH)
-        realignSelection()
-    }
-
-    fun goToNext() {
-        _month.value = _month.value.plus(1, DateTimeUnit.MONTH)
-        realignSelection()
     }
 
     fun goToToday() {
         _month.value = YearMonth(todayDate.year, todayDate.month)
-        _selectedDate.value = todayDate
+        _selectedDate.value = null
     }
 
     /**
@@ -292,13 +339,12 @@ class MonthViewModel @Inject constructor(
      * otherwise sit wherever paged navigation last left it (today's month, on a
      * fresh open) — and a switch to a paged style, or a reseed of the other
      * scrolling style's list, would jump there instead of holding position. The
-     * selection is realigned alongside it so that landing on the Split style
+     * selection is cleared alongside it so Split opens the visible month's agenda.
-     * shows a live day in the month on screen rather than a stale, off-month one.
      */
     fun syncScrollMonth(ym: YearMonth) {
         if (_month.value == ym) return
         _month.value = ym
-        _selectedDate.value = selectionForMonth(ym, todayDate)
+        _selectedDate.value = null
     }
 
     /** Jump to the month containing [date] (drawer jump-to-date). */
@@ -461,11 +507,7 @@ internal fun instancesByDay(
     days.associateWith { day ->
         instances
             .filter { it.coversDay(day, zone) }
-            .sortedWith(
+            .sortedWith(eventDisplayComparator(zone))
-                compareBy<EventInstance> { it.isDeclined }
-                    .thenByDescending { it.isAllDay }
-                    .thenBy { it.start },
-            )
     }
 
 /**
@@ -506,11 +548,10 @@ private const val WINDOW_EDGE = 2
 internal fun edgeForPad(pad: Int): Int = minOf(WINDOW_EDGE, pad - 1).coerceAtLeast(0)
 
 /**
- * Which day the split style should select when the grid lands on [month]:
+ * First day shown in the split agenda: today in the current month, otherwise
- * [today] when the month holds it, otherwise the 1st. Pure so the rule can be
+ * the first of the visible month.
- * tested without standing up a view model and a provider behind it.
  */
-internal fun selectionForMonth(month: YearMonth, today: LocalDate): LocalDate =
+internal fun agendaStartForMonth(month: YearMonth, today: LocalDate): LocalDate =
     if (YearMonth(today.year, today.month) == month) {
         today
     } else {

app/src/main/java/de/jeanlucmakiola/calendula/ui/onboarding/ViewStep.kt

@@ -18,11 +18,11 @@ import de.jeanlucmakiola.calendula.data.prefs.resolveFirstDay
 import de.jeanlucmakiola.calendula.ui.agenda.AgendaViewPreview
 import de.jeanlucmakiola.calendula.ui.common.CalendarView
 import de.jeanlucmakiola.calendula.ui.common.IMPLEMENTED_VIEWS
+import de.jeanlucmakiola.calendula.ui.common.LocalMultiDayCount
 import de.jeanlucmakiola.calendula.ui.common.PickerDescription
 import de.jeanlucmakiola.calendula.ui.common.ViewPreviewFrame
 import de.jeanlucmakiola.calendula.ui.common.icon
-import de.jeanlucmakiola.calendula.ui.common.labelRes
+import de.jeanlucmakiola.calendula.ui.common.label
-import de.jeanlucmakiola.calendula.ui.day.DayViewPreview
 import de.jeanlucmakiola.calendula.ui.month.MonthStylePreview
 import de.jeanlucmakiola.calendula.ui.month.MonthViewStyle
 import de.jeanlucmakiola.calendula.ui.month.descriptionRes
@@ -67,14 +67,19 @@ internal fun ViewStep(
                     height = PREVIEW_HEIGHT,
                 )
                 CalendarView.Week -> WeekViewPreview(weekStart = weekStart, height = PREVIEW_HEIGHT)
-                CalendarView.Day -> DayViewPreview(height = PREVIEW_HEIGHT)
+                CalendarView.MultiDay -> WeekViewPreview(
+                    weekStart = weekStart,
+                    height = PREVIEW_HEIGHT,
+                    dayCount = LocalMultiDayCount.current,
+                )
+                CalendarView.Day -> WeekViewPreview(weekStart = weekStart, height = PREVIEW_HEIGHT, dayCount = 1)
                 CalendarView.Agenda -> AgendaViewPreview(height = PREVIEW_HEIGHT)
             }
         }
         IMPLEMENTED_VIEWS.forEachIndexed { index, view ->
             val isSelected = view == choice.defaultView
             GroupedRow(
-                title = stringResource(view.labelRes),
+                title = view.label(),
                 position = positionOf(index, IMPLEMENTED_VIEWS.size),
                 selected = isSelected,
                 leading = {

app/src/main/java/de/jeanlucmakiola/calendula/ui/search/SearchScreen.kt

@@ -126,6 +126,7 @@ fun SearchScreen(
     onBack: () -> Unit,
     onEventClick: (EventInstance) -> Unit,
     modifier: Modifier = Modifier,
+    visible: Boolean = true,
     viewModel: SearchViewModel = hiltViewModel(),
 ) {
     val query by viewModel.query.collectAsStateWithLifecycle()
@@ -184,7 +185,7 @@ fun SearchScreen(
     BackHandler(enabled = inSelection) { viewModel.clearSelection() }
 
     Scaffold(
-        modifier = modifier.predictiveBack(onBack = onBack, enabled = !inSelection),
+        modifier = modifier.predictiveBack(onBack = onBack, enabled = !inSelection, visible = visible),
         containerColor = MaterialTheme.colorScheme.surface,
         topBar = {
             SearchTopBar(

app/src/main/java/de/jeanlucmakiola/calendula/ui/settings/AppearanceSettings.kt

@@ -76,6 +76,7 @@ internal fun AppearanceScreen(
     state: SettingsUiState,
     viewModel: SettingsViewModel,
     onBack: () -> Unit,
+    visible: Boolean = true,
 ) {
     var showTheme by remember { mutableStateOf(false) }
     var showBrandFont by remember { mutableStateOf(false) }
@@ -96,6 +97,7 @@ internal fun AppearanceScreen(
         title = stringResource(R.string.settings_section_appearance),
         onBack = onBack,
         predictiveBack = true,
+        visible = visible,
     ) {
         // Theme & colour
         GroupedRow(

app/src/main/java/de/jeanlucmakiola/calendula/ui/settings/EventFormSettings.kt

@@ -41,6 +41,7 @@ internal fun EventFormScreen(
     state: SettingsUiState,
     viewModel: SettingsViewModel,
     onBack: () -> Unit,
+    visible: Boolean = true,
 ) {
     var showDefaultDuration by remember { mutableStateOf(false) }
     // The calendar whose duration-override picker is open, if any.
@@ -53,6 +54,7 @@ internal fun EventFormScreen(
         title = stringResource(R.string.settings_section_event_form),
         onBack = onBack,
         predictiveBack = true,
+        visible = visible,
     ) {
         SettingsHint(stringResource(R.string.settings_form_fields_hint))
         Spacer(Modifier.height(8.dp))

app/src/main/java/de/jeanlucmakiola/calendula/ui/settings/NotificationSettings.kt

@@ -63,6 +63,7 @@ internal fun NotificationsScreen(
     viewModel: SettingsViewModel,
     onBack: () -> Unit,
     onOpenSpecialDates: () -> Unit,
+    visible: Boolean = true,
 ) {
     val context = LocalContext.current
     val launcher = rememberLauncherForActivityResult(
@@ -92,6 +93,7 @@ internal fun NotificationsScreen(
         title = stringResource(R.string.settings_section_notifications),
         onBack = onBack,
         predictiveBack = true,
+        visible = visible,
     ) {
         GroupedRow(
             title = stringResource(R.string.settings_reminders),

app/src/main/java/de/jeanlucmakiola/calendula/ui/settings/SettingsScreen.kt

@@ -2,9 +2,7 @@ package de.jeanlucmakiola.calendula.ui.settings
 
 import androidx.compose.animation.AnimatedVisibility
 import androidx.compose.animation.fadeIn
-import androidx.compose.animation.fadeOut
 import androidx.compose.animation.slideInHorizontally
-import androidx.compose.animation.slideOutHorizontally
 import androidx.compose.foundation.Image
 import androidx.compose.foundation.background
 import androidx.compose.foundation.layout.Box
@@ -66,6 +64,7 @@ import de.jeanlucmakiola.floret.crash.CrashReportDialog
 import de.jeanlucmakiola.floret.crash.CrashReporter
 import de.jeanlucmakiola.floret.crash.openIssueTracker
 import de.jeanlucmakiola.floret.crash.submitCrashReport
+import de.jeanlucmakiola.floret.identity.predictiveBackExit
 import de.jeanlucmakiola.floret.locale.AppLanguage
 
 /** The settings sub-screens reached from the hub's category rows. */
@@ -85,11 +84,14 @@ fun SettingsScreen(
     onManageCalendars: () -> Unit,
     onOpenBackup: () -> Unit,
     modifier: Modifier = Modifier,
+    visible: Boolean = true,
     viewModel: SettingsViewModel = hiltViewModel(),
 ) {
     val state by viewModel.state.collectAsStateWithLifecycle()
     var section by rememberSaveable { mutableStateOf<SettingsSection?>(null) }
     val slideSpec = rememberCalendarSlideSpec()
+    // Leaves from the predictive-back preview rather than sliding off at full size.
+    val overlayExit = predictiveBackExit()
 
     Box(
         modifier = modifier
@@ -101,61 +103,63 @@ fun SettingsScreen(
             onOpenSection = { section = it },
             onManageCalendars = onManageCalendars,
             onOpenBackup = onOpenBackup,
+            visible = visible,
         )
 
         AnimatedVisibility(
             visible = section == SettingsSection.Appearance,
             enter = slideInHorizontally(slideSpec) { it } + fadeIn(),
-            exit = slideOutHorizontally(slideSpec) { it } + fadeOut(),
+            exit = overlayExit,
         ) {
-            AppearanceScreen(state = state, viewModel = viewModel, onBack = { section = null })
+            AppearanceScreen(state = state, viewModel = viewModel, onBack = { section = null }, visible = section == SettingsSection.Appearance)
         }
         AnimatedVisibility(
             visible = section == SettingsSection.Views,
             enter = slideInHorizontally(slideSpec) { it } + fadeIn(),
-            exit = slideOutHorizontally(slideSpec) { it } + fadeOut(),
+            exit = overlayExit,
         ) {
-            ViewsScreen(state = state, viewModel = viewModel, onBack = { section = null })
+            ViewsScreen(state = state, viewModel = viewModel, onBack = { section = null }, visible = section == SettingsSection.Views)
         }
         AnimatedVisibility(
             visible = section == SettingsSection.EventForm,
             enter = slideInHorizontally(slideSpec) { it } + fadeIn(),
-            exit = slideOutHorizontally(slideSpec) { it } + fadeOut(),
+            exit = overlayExit,
         ) {
-            EventFormScreen(state = state, viewModel = viewModel, onBack = { section = null })
+            EventFormScreen(state = state, viewModel = viewModel, onBack = { section = null }, visible = section == SettingsSection.EventForm)
         }
         AnimatedVisibility(
             visible = section == SettingsSection.Notifications,
             enter = slideInHorizontally(slideSpec) { it } + fadeIn(),
-            exit = slideOutHorizontally(slideSpec) { it } + fadeOut(),
+            exit = overlayExit,
         ) {
             NotificationsScreen(
                 state = state,
                 viewModel = viewModel,
                 onBack = { section = null },
                 onOpenSpecialDates = { section = SettingsSection.SpecialDates },
+                visible = section == SettingsSection.Notifications,
             )
         }
         AnimatedVisibility(
             visible = section == SettingsSection.SpecialDates,
             enter = slideInHorizontally(slideSpec) { it } + fadeIn(),
-            exit = slideOutHorizontally(slideSpec) { it } + fadeOut(),
+            exit = overlayExit,
         ) {
-            SpecialDatesScreen(viewModel = viewModel, onBack = { section = null })
+            SpecialDatesScreen(viewModel = viewModel, onBack = { section = null }, visible = section == SettingsSection.SpecialDates)
         }
         AnimatedVisibility(
             visible = section == SettingsSection.Widgets,
             enter = slideInHorizontally(slideSpec) { it } + fadeIn(),
-            exit = slideOutHorizontally(slideSpec) { it } + fadeOut(),
+            exit = overlayExit,
         ) {
-            WidgetsScreen(state = state, viewModel = viewModel, onBack = { section = null })
+            WidgetsScreen(state = state, viewModel = viewModel, onBack = { section = null }, visible = section == SettingsSection.Widgets)
         }
         AnimatedVisibility(
             visible = section == SettingsSection.Licences,
             enter = slideInHorizontally(slideSpec) { it } + fadeIn(),
-            exit = slideOutHorizontally(slideSpec) { it } + fadeOut(),
+            exit = overlayExit,
         ) {
-            LicencesScreen(onBack = { section = null })
+            LicencesScreen(onBack = { section = null }, visible = section == SettingsSection.Licences)
         }
     }
 }
@@ -170,8 +174,14 @@ private fun SettingsHub(
     onOpenSection: (SettingsSection) -> Unit,
     onManageCalendars: () -> Unit,
     onOpenBackup: () -> Unit,
+    visible: Boolean,
 ) {
-    CollapsingScaffold(title = stringResource(R.string.settings_title), onBack = onBack, predictiveBack = true) {
+    CollapsingScaffold(
+        title = stringResource(R.string.settings_title),
+        onBack = onBack,
+        predictiveBack = true,
+        visible = visible,
+    ) {
         // Card and support row are one grouped block, so the call to action
         // continues the container instead of sitting inside it as a button.
         Box(Modifier.padding(horizontal = GroupedListInset)) { AboutCard() }

app/src/main/java/de/jeanlucmakiola/calendula/ui/settings/SettingsUiState.kt

@@ -13,6 +13,7 @@ import de.jeanlucmakiola.calendula.ui.agenda.AgendaRange
 import de.jeanlucmakiola.calendula.ui.common.CalendarView
 import de.jeanlucmakiola.calendula.ui.common.IMPLEMENTED_VIEWS
 import de.jeanlucmakiola.calendula.ui.common.QuickSwitchConfig
+import de.jeanlucmakiola.calendula.ui.common.TimelineHours
 import de.jeanlucmakiola.calendula.ui.common.TimelineScale
 import de.jeanlucmakiola.calendula.ui.month.MonthViewStyle
 import de.jeanlucmakiola.calendula.widget.WidgetSize
@@ -34,6 +35,8 @@ data class SettingsUiState(
     val timeFormat: TimeFormatPref = TimeFormatPref.AUTO,
     /** Whether the week/day timeline seats each hour in its own cell (v2.11). */
     val showHourGrid: Boolean = false,
+    /** Days the multi-day view shows side by side (#193). */
+    val multiDayCount: Int = SettingsPrefs.DEFAULT_MULTI_DAY_COUNT,
     /** How the Agenda screen treats events that already ended today. */
     val pastEventDisplay: PastEventDisplay = PastEventDisplay.SHOW,
     /** Whether the month/week grids fade events that have already finished. */
@@ -62,6 +65,7 @@ data class SettingsUiState(
     val monthViewStyle: MonthViewStyle = MonthViewStyle.Paged,
     /** How tall an hour is drawn in the week and day timelines (#56). */
     val timelineScale: TimelineScale = TimelineScale.Regular,
+    val timelineHours: TimelineHours = TimelineHours(),
     /** Order of the views in the navigation drawer (#24); every view is always listed. */
     val drawerViewOrder: List<CalendarView> = IMPLEMENTED_VIEWS,
     /** Optional event-form fields shown by default (rest behind "more fields"). */

app/src/main/java/de/jeanlucmakiola/calendula/ui/settings/SettingsViewModel.kt

@@ -36,6 +36,7 @@ import de.jeanlucmakiola.calendula.ui.agenda.AgendaRange
 import de.jeanlucmakiola.calendula.ui.agenda.storageValue
 import de.jeanlucmakiola.calendula.ui.common.CalendarView
 import de.jeanlucmakiola.calendula.ui.common.QuickSwitchConfig
+import de.jeanlucmakiola.calendula.ui.common.TimelineHours
 import de.jeanlucmakiola.calendula.ui.common.TimelineScale
 import de.jeanlucmakiola.calendula.ui.month.MonthViewStyle
 import de.jeanlucmakiola.calendula.ui.theme.AppFontSettings
@@ -148,11 +149,12 @@ class SettingsViewModel @Inject constructor(
                     combine(
                         prefs.todayButtonInToolbar,
                         prefs.dragToReschedule,
-                        ::Pair,
+                        prefs.multiDayCount,
+                        ::Triple,
                     ),
-                ) { hourLines, weekNumbers, showToday, soften, (todayInToolbar, dragToMove) ->
+                ) { hourLines, weekNumbers, showToday, soften, (todayInToolbar, dragToMove, multiDay) ->
                     DisplayToggles(
-                        hourLines, weekNumbers, showToday, soften, todayInToolbar, dragToMove,
+                        hourLines, weekNumbers, showToday, soften, todayInToolbar, dragToMove, multiDay,
                     )
                 },
             ) { view, screenRange, widgetRange, timeFormat, toggles ->
@@ -164,6 +166,7 @@ class SettingsViewModel @Inject constructor(
                     softenColors = toggles.softenColors,
                     todayButtonInToolbar = toggles.todayButtonInToolbar,
                     dragToReschedule = toggles.dragToReschedule,
+                    multiDayCount = toggles.multiDayCount,
                 )
             },
             combine(
@@ -178,9 +181,11 @@ class SettingsViewModel @Inject constructor(
                     prefs.drawerViewOrder,
                     prefs.monthViewStyle,
                     prefs.widgetSize,
-                    prefs.timelineScale,
+                    combine(prefs.timelineScale, prefs.timelineHours, ::Pair),
-                ) { quickSwitch, drawer, monthStyle, widgetSize, timelineScale ->
+                ) { quickSwitch, drawer, monthStyle, widgetSize, (timelineScale, timelineHours) ->
-                    ViewCustomization(quickSwitch, drawer, monthStyle, widgetSize, timelineScale)
+                    ViewCustomization(
+                        quickSwitch, drawer, monthStyle, widgetSize, timelineScale, timelineHours,
+                    )
                 },
             ) { showRangeBar, autofocus, pastEvents, dimCompleted, viewCustomization ->
                 MiscSettings(showRangeBar, autofocus, pastEvents, dimCompleted, viewCustomization)
@@ -197,6 +202,7 @@ class SettingsViewModel @Inject constructor(
                 softenColors = views.softenColors,
                 todayButtonInToolbar = views.todayButtonInToolbar,
                 dragToReschedule = views.dragToReschedule,
+                multiDayCount = views.multiDayCount,
                 agendaShowRangeBar = misc.showRangeBar,
                 autofocusEventTitle = misc.autofocusEventTitle,
                 pastEventDisplay = misc.pastEventDisplay,
@@ -206,6 +212,7 @@ class SettingsViewModel @Inject constructor(
                 monthViewStyle = misc.viewCustomization.monthViewStyle,
                 widgetSize = misc.viewCustomization.widgetSize,
                 timelineScale = misc.viewCustomization.timelineScale,
+                timelineHours = misc.viewCustomization.timelineHours,
                 allowColorOnUnsupportedCalendars = defaults.allowColor,
                 defaultReminderMinutes = defaults.defaultReminder,
                 defaultAllDayReminderMinutes = defaults.allDayReminder,
@@ -298,6 +305,7 @@ class SettingsViewModel @Inject constructor(
         val softenColors: Boolean,
         val todayButtonInToolbar: Boolean,
         val dragToReschedule: Boolean,
+        val multiDayCount: Int,
     )
 
     private data class DisplayToggles(
@@ -307,6 +315,7 @@ class SettingsViewModel @Inject constructor(
         val softenColors: Boolean,
         val todayButtonInToolbar: Boolean,
         val dragToReschedule: Boolean,
+        val multiDayCount: Int,
     )
 
     private data class MiscSettings(
@@ -323,6 +332,7 @@ class SettingsViewModel @Inject constructor(
         val monthViewStyle: MonthViewStyle,
         val widgetSize: WidgetSize,
         val timelineScale: TimelineScale,
+        val timelineHours: TimelineHours,
     )
 
     /** Contact special-dates sub-page (issue #15); its own flow — the main state is full. */
@@ -532,6 +542,10 @@ class SettingsViewModel @Inject constructor(
         viewModelScope.launch { prefs.setTimeFormat(pref) }
     }
 
+    fun setMultiDayCount(count: Int) {
+        viewModelScope.launch { prefs.setMultiDayCount(count) }
+    }
+
     fun setShowHourGrid(enabled: Boolean) {
         viewModelScope.launch { prefs.setShowHourGrid(enabled) }
     }
@@ -617,6 +631,10 @@ class SettingsViewModel @Inject constructor(
         viewModelScope.launch { prefs.setTimelineScale(scale) }
     }
 
+    fun setTimelineHours(hours: TimelineHours) {
+        viewModelScope.launch { prefs.setTimelineHours(hours) }
+    }
+
     fun setDrawerViewOrder(order: List<CalendarView>) {
         viewModelScope.launch { prefs.setDrawerViewOrder(order) }
     }

app/src/main/java/de/jeanlucmakiola/calendula/ui/settings/SpecialDatesSettings.kt

@@ -46,6 +46,7 @@ import de.jeanlucmakiola.floret.reminders.ReminderOverride
 internal fun SpecialDatesScreen(
     viewModel: SettingsViewModel,
     onBack: () -> Unit,
+    visible: Boolean = true,
 ) {
     val state by viewModel.specialDatesState.collectAsStateWithLifecycle()
     val settings by viewModel.state.collectAsStateWithLifecycle()
@@ -76,6 +77,7 @@ internal fun SpecialDatesScreen(
         title = stringResource(R.string.settings_section_special_dates),
         onBack = onBack,
         predictiveBack = true,
+        visible = visible,
     ) {
         // Paused banner: the permission was revoked after enabling.
         if (state.enabled && state.stalledPermission) {

app/src/main/java/de/jeanlucmakiola/calendula/ui/settings/ViewsSettings.kt

@@ -21,10 +21,12 @@ import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.res.pluralStringResource
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.unit.dp
 import de.jeanlucmakiola.calendula.R
 import de.jeanlucmakiola.calendula.data.prefs.PastEventDisplay
+import de.jeanlucmakiola.calendula.data.prefs.SettingsPrefs
 import de.jeanlucmakiola.calendula.data.prefs.TimeFormatPref
 import de.jeanlucmakiola.calendula.data.prefs.WeekStartPref
 import de.jeanlucmakiola.calendula.data.prefs.resolveFirstDay
@@ -32,11 +34,15 @@ import de.jeanlucmakiola.calendula.ui.common.AgendaRangePicker
 import de.jeanlucmakiola.calendula.ui.common.CalendarView
 import de.jeanlucmakiola.calendula.ui.common.IMPLEMENTED_VIEWS
 import de.jeanlucmakiola.calendula.ui.common.PickerDescription
+import de.jeanlucmakiola.calendula.ui.common.LocalUse24HourFormat
+import de.jeanlucmakiola.calendula.ui.common.TimelineHours
 import de.jeanlucmakiola.calendula.ui.common.TimelineScale
 import de.jeanlucmakiola.calendula.ui.common.agendaRangeLabel
 import de.jeanlucmakiola.calendula.ui.common.descriptionRes
+import de.jeanlucmakiola.calendula.ui.common.formatMinuteOfDay
 import de.jeanlucmakiola.calendula.ui.common.formatTimeOfDay
 import de.jeanlucmakiola.calendula.ui.common.icon
+import de.jeanlucmakiola.calendula.ui.common.label
 import de.jeanlucmakiola.calendula.ui.common.labelRes
 import de.jeanlucmakiola.calendula.ui.month.labelRes
 import de.jeanlucmakiola.floret.components.CollapsingScaffold
@@ -62,6 +68,7 @@ internal fun ViewsScreen(
     state: SettingsUiState,
     viewModel: SettingsViewModel,
     onBack: () -> Unit,
+    visible: Boolean = true,
 ) {
     var showMonthStyle by remember { mutableStateOf(false) }
     var showDefaultView by remember { mutableStateOf(false) }
@@ -70,11 +77,16 @@ internal fun ViewsScreen(
     var showPastEvents by remember { mutableStateOf(false) }
     var showAgendaScreenRange by remember { mutableStateOf(false) }
     var showTimelineScale by remember { mutableStateOf(false) }
+    var showMultiDayCount by remember { mutableStateOf(false) }
+    var showHoursStart by remember { mutableStateOf(false) }
+    var showHoursEnd by remember { mutableStateOf(false) }
+    val hours = state.timelineHours
 
     CollapsingScaffold(
         title = stringResource(R.string.settings_section_views),
         onBack = onBack,
         predictiveBack = true,
+        visible = visible,
     ) {
         val config = state.quickSwitchConfig
 
@@ -82,7 +94,7 @@ internal fun ViewsScreen(
         SectionHeader(stringResource(R.string.settings_views_all_header))
         GroupedRow(
             title = stringResource(R.string.settings_default_view),
-            summary = stringResource(state.defaultView.labelRes),
+            summary = state.defaultView.label(),
             position = Position.Top,
             onClick = { showDefaultView = true },
         )
@@ -159,11 +171,56 @@ internal fun ViewsScreen(
         Spacer(Modifier.height(8.dp))
         SectionHeader(stringResource(R.string.settings_week_day_header))
         GroupedRow(
-            title = stringResource(R.string.settings_timeline_scale),
+            title = stringResource(R.string.settings_multi_day_count),
-            summary = stringResource(state.timelineScale.labelRes),
+            summary = multiDayLabel(state.multiDayCount),
             position = Position.Top,
-            onClick = { showTimelineScale = true },
+            onClick = { showMultiDayCount = true },
         )
+        GroupedRow(
+            title = stringResource(R.string.settings_timeline_scale),
+            summary = if (hours.enabled) {
+                stringResource(R.string.settings_timeline_scale_by_visible_hours)
+            } else {
+                stringResource(state.timelineScale.labelRes)
+            },
+            position = Position.Middle,
+            dimmed = hours.enabled,
+            onClick = if (hours.enabled) null else ({ showTimelineScale = true }),
+        )
+        GroupedRow(
+            title = stringResource(R.string.settings_visible_hours),
+            summary = if (hours.enabled) {
+                stringResource(
+                    R.string.settings_visible_hours_on_summary,
+                    hourLabel(hours.startHour),
+                    hourLabel(hours.endHour),
+                )
+            } else {
+                stringResource(R.string.settings_visible_hours_summary)
+            },
+            position = Position.Middle,
+            trailing = {
+                Switch(
+                    checked = hours.enabled,
+                    onCheckedChange = { viewModel.setTimelineHours(hours.copy(enabled = it)) },
+                )
+            },
+            onClick = { viewModel.setTimelineHours(hours.copy(enabled = !hours.enabled)) },
+        )
+        if (hours.enabled) {
+            GroupedRow(
+                title = stringResource(R.string.settings_visible_hours_start),
+                summary = hourLabel(hours.startHour),
+                position = Position.Middle,
+                onClick = { showHoursStart = true },
+            )
+            GroupedRow(
+                title = stringResource(R.string.settings_visible_hours_end),
+                summary = hourLabel(hours.endHour),
+                position = Position.Middle,
+                onClick = { showHoursEnd = true },
+            )
+        }
         GroupedRow(
             title = stringResource(R.string.settings_hour_lines),
             summary = stringResource(R.string.settings_hour_lines_summary),
@@ -275,7 +332,7 @@ internal fun ViewsScreen(
             predictiveBack = true,
             options = IMPLEMENTED_VIEWS,
             selected = state.defaultView,
-            label = { stringResource(it.labelRes) },
+            label = { it.label() },
             leading = {
                 Icon(
                     imageVector = it.icon,
@@ -337,6 +394,18 @@ internal fun ViewsScreen(
             onDismiss = { showPastEvents = false },
         )
     }
+    if (showMultiDayCount) {
+        OptionPicker(
+            title = stringResource(R.string.settings_multi_day_count),
+            header = { PickerDescription(stringResource(R.string.settings_multi_day_count_hint)) },
+            predictiveBack = true,
+            options = SettingsPrefs.MULTI_DAY_COUNTS.toList(),
+            selected = state.multiDayCount,
+            label = { multiDayLabel(it) },
+            onSelect = viewModel::setMultiDayCount,
+            onDismiss = { showMultiDayCount = false },
+        )
+    }
     if (showTimelineScale) {
         OptionPicker(
             title = stringResource(R.string.settings_timeline_scale),
@@ -356,6 +425,30 @@ internal fun ViewsScreen(
             onDismiss = { showTimelineScale = false },
         )
     }
+    if (showHoursStart) {
+        OptionPicker(
+            title = stringResource(R.string.settings_visible_hours_start),
+            header = { PickerDescription(stringResource(R.string.settings_visible_hours_start_hint)) },
+            predictiveBack = true,
+            options = TimelineHours.startOptions(hours.endHour),
+            selected = hours.startHour,
+            label = { hourLabel(it) },
+            onSelect = { viewModel.setTimelineHours(hours.copy(startHour = it)) },
+            onDismiss = { showHoursStart = false },
+        )
+    }
+    if (showHoursEnd) {
+        OptionPicker(
+            title = stringResource(R.string.settings_visible_hours_end),
+            header = { PickerDescription(stringResource(R.string.settings_visible_hours_end_hint)) },
+            predictiveBack = true,
+            options = TimelineHours.endOptions(hours.startHour),
+            selected = hours.endHour,
+            label = { hourLabel(it) },
+            onSelect = { viewModel.setTimelineHours(hours.copy(endHour = it)) },
+            onDismiss = { showHoursEnd = false },
+        )
+    }
     if (showAgendaScreenRange) {
         AgendaRangePicker(
             title = stringResource(R.string.settings_agenda_range),
@@ -384,7 +477,7 @@ private fun ViewRow(
     trailing: @Composable (() -> Unit)? = null,
 ) {
     GroupedRow(
-        title = stringResource(view.labelRes),
+        title = view.label(),
         position = position,
         dimmed = dimmed,
         minHeight = ReorderableRowHeight,
@@ -449,3 +542,12 @@ internal fun pastEventDisplayLabelRes(mode: PastEventDisplay): Int = when (mode)
     PastEventDisplay.DIM -> R.string.settings_past_events_dim
     PastEventDisplay.HIDE -> R.string.settings_past_events_hide
 }
+
+@Composable
+private fun multiDayLabel(count: Int): String =
+    pluralStringResource(R.plurals.view_multi_day, count, count)
+
+/** A whole hour in the app's clock convention; 24 reads as the end of the day. */
+@Composable
+private fun hourLabel(hour: Int): String =
+    formatMinuteOfDay(hour * 60, LocalUse24HourFormat.current, currentLocale())

app/src/main/java/de/jeanlucmakiola/calendula/ui/settings/WidgetSettings.kt

@@ -42,6 +42,7 @@ internal fun WidgetsScreen(
     state: SettingsUiState,
     viewModel: SettingsViewModel,
     onBack: () -> Unit,
+    visible: Boolean = true,
 ) {
     var showAgendaWidgetRange by remember { mutableStateOf(false) }
     var showWidgetSize by remember { mutableStateOf(false) }
@@ -50,6 +51,7 @@ internal fun WidgetsScreen(
         title = stringResource(R.string.settings_section_widgets),
         onBack = onBack,
         predictiveBack = true,
+        visible = visible,
     ) {
         SettingsHint(stringResource(R.string.settings_widgets_hint))
         Spacer(Modifier.height(8.dp))

app/src/main/java/de/jeanlucmakiola/calendula/ui/week/ColumnGeometry.kt

@@ -0,0 +1,169 @@
+package de.jeanlucmakiola.calendula.ui.week
+
+import androidx.compose.foundation.layout.Box
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.Immutable
+import androidx.compose.runtime.Stable
+import androidx.compose.runtime.key
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.layout.Layout
+import androidx.compose.ui.unit.Dp
+import de.jeanlucmakiola.calendula.domain.EventInstance
+import kotlinx.datetime.DateTimeUnit
+import kotlinx.datetime.LocalDate
+import kotlinx.datetime.daysUntil
+import kotlinx.datetime.plus
+import kotlin.math.roundToInt
+
+/** A day column's place across the timeline, in pixels from its start edge. */
+@Immutable
+data class ColumnSlot(val left: Float, val width: Float) {
+    val right: Float get() = left + width
+}
+
+/**
+ * [date]'s column on a page showing this span across [width] pixels, with [gap]
+ * between columns. A date off the page carries on at the same pitch, off screen
+ * on its side — where a view switch slides it in from, or out to.
+ */
+fun DaySpan.slot(date: LocalDate, width: Float, gap: Float): ColumnSlot {
+    val pitch = (width + gap) / count
+    return ColumnSlot(left = start.daysUntil(date) * pitch, width = pitch - gap)
+}
+
+/** The last day of the span. */
+val DaySpan.end: LocalDate get() = start.plus(count - 1, DateTimeUnit.DAY)
+
+/**
+ * The timeline's columns: one page's, or — while switching between the day, the
+ * multi-day and the week view (#184) — every day of both pages, each column
+ * between where it sits in the one and where it sits in the other.
+ *
+ * @param progress how far from [from] to [to], read at layout time only.
+ */
+@Stable
+class ColumnGeometry(val from: DaySpan, val to: DaySpan, val progress: () -> Float) {
+
+    /** Every day either page shows, in order: the two overlap, so they run on unbroken. */
+    val dates: List<LocalDate> = run {
+        val first = minOf(from.start, to.start)
+        val last = maxOf(from.end, to.end)
+        (0..first.daysUntil(last)).map { first.plus(it, DateTimeUnit.DAY) }
+    }
+
+    fun slot(date: LocalDate, width: Float, gap: Float): ColumnSlot {
+        val a = from.slot(date, width, gap)
+        if (from == to) return a
+        val b = to.slot(date, width, gap)
+        val p = progress()
+        return ColumnSlot(lerp(a.left, b.left, p), lerp(a.width, b.width, p))
+    }
+
+    /** The span of columns [range] covers, between its extent on each page. */
+    fun extent(fromRange: ClosedRange<LocalDate>, toRange: ClosedRange<LocalDate>, width: Float, gap: Float): ColumnSlot {
+        val a = from.extent(fromRange, width, gap)
+        if (from == to && fromRange == toRange) return a
+        val b = to.extent(toRange, width, gap)
+        val p = progress()
+        val left = lerp(a.left, b.left, p)
+        return ColumnSlot(left, lerp(a.right, b.right, p) - left)
+    }
+
+    companion object {
+        /** One page's columns, standing still. */
+        fun of(span: DaySpan): ColumnGeometry = ColumnGeometry(span, span) { 0f }
+    }
+}
+
+private fun DaySpan.extent(range: ClosedRange<LocalDate>, width: Float, gap: Float): ColumnSlot {
+    val left = slot(range.start, width, gap).left
+    return ColumnSlot(left, slot(range.endInclusive, width, gap).right - left)
+}
+
+internal fun lerp(a: Float, b: Float, p: Float): Float = a + (b - a) * p
+
+/**
+ * Lays [content] out once per day of [geometry], each across its column. The
+ * columns are placed in the layout pass, so a view switch moving them every
+ * frame re-lays them out without recomposing them. Children fill the height
+ * the layout is given, or wrap it when it has none.
+ */
+@Composable
+fun TimelineColumns(
+    geometry: ColumnGeometry,
+    gap: Dp,
+    modifier: Modifier = Modifier,
+    content: @Composable (LocalDate) -> Unit,
+) {
+    val dates = geometry.dates
+    Layout(
+        content = {
+            dates.forEach { date ->
+                key(date) { Box(propagateMinConstraints = true) { content(date) } }
+            }
+        },
+        modifier = modifier,
+    ) { measurables, constraints ->
+        val width = constraints.maxWidth
+        val gapPx = gap.toPx()
+        val slots = dates.map { geometry.slot(it, width.toFloat(), gapPx) }
+        val placeables = measurables.mapIndexed { i, measurable ->
+            val left = slots[i].left.roundToInt()
+            val columnWidth = (slots[i].right.roundToInt() - left).coerceAtLeast(0)
+            measurable.measure(constraints.copy(minWidth = columnWidth, maxWidth = columnWidth))
+        }
+        val height = placeables.maxOfOrNull { it.height }?.coerceAtLeast(constraints.minHeight)
+            ?: constraints.minHeight
+        layout(width, height) {
+            placeables.forEachIndexed { i, placeable ->
+                placeable.placeRelative(slots[i].left.roundToInt(), 0)
+            }
+        }
+    }
+}
+
+/**
+ * An all-day bar as each page lays it out: the days it covers there, clipped to
+ * the page, and its lane. A bar only one page has keeps its days on the other,
+ * so it slides out with them rather than vanishing.
+ */
+@Immutable
+data class PlacedBar(
+    val event: EventInstance,
+    /** The day the bar is drawn from on the page it is tagged on, for the view morph. */
+    val keyDate: LocalDate,
+    val fromRange: ClosedRange<LocalDate>,
+    val toRange: ClosedRange<LocalDate>,
+    val fromLane: Int,
+    val toLane: Int,
+)
+
+/** [state]'s all-day bars, standing still. */
+internal fun staticBars(state: WeekUiState.Success): List<PlacedBar> =
+    state.allDaySpans.map { span ->
+        val range = state.days[span.startCol]..state.days[span.endCol]
+        PlacedBar(span.event, range.start, range, range, span.lane, span.lane)
+    }
+
+/**
+ * The all-day bars of both pages of a view switch, each once: matched by
+ * occurrence, placed on each page as that page lays it out.
+ */
+internal fun morphBars(from: WeekUiState.Success?, to: WeekUiState.Success?): List<PlacedBar> {
+    val fromBars = from?.let(::staticBars).orEmpty().associateBy { it.event.occurrence() }
+    val toBars = to?.let(::staticBars).orEmpty().associateBy { it.event.occurrence() }
+    return (fromBars.keys + toBars.keys).map { occurrence ->
+        val a = fromBars[occurrence]
+        val b = toBars[occurrence]
+        PlacedBar(
+            event = (a ?: b)!!.event,
+            keyDate = (a ?: b)!!.keyDate,
+            fromRange = (a ?: b)!!.fromRange,
+            toRange = (b ?: a)!!.toRange,
+            fromLane = (a ?: b)!!.fromLane,
+            toLane = (b ?: a)!!.toLane,
+        )
+    }
+}
+
+private fun EventInstance.occurrence(): Pair<Long, Long> = eventId to start.toEpochMilliseconds()

app/src/main/java/de/jeanlucmakiola/calendula/ui/week/TimelineMorph.kt

@@ -0,0 +1,32 @@
+package de.jeanlucmakiola.calendula.ui.week
+
+import androidx.compose.animation.core.Animatable
+import androidx.compose.runtime.Stable
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.datetime.LocalDate
+
+/**
+ * A switch between two timeline views in progress (#184): the page on screen
+ * when it started, the page it ends on, and how far between the two it is.
+ */
+@Stable
+internal class TimelineMorph(
+    val fromKind: TimelineKind,
+    val toKind: TimelineKind,
+    val from: DaySpan,
+    val to: DaySpan,
+    val fromState: StateFlow<WeekUiState>,
+    val toState: StateFlow<WeekUiState>,
+) {
+    val progress = Animatable(0f)
+
+    /** Whether the columns change size a lot, from a single day to a week or back, and take longer for it. */
+    val isLong: Boolean get() = maxOf(from.count, to.count) > LONG_SWITCH_RATIO * minOf(from.count, to.count)
+
+    /** Where each day's events come from: the page it was on, else the page it goes to. */
+    fun sourceOf(date: LocalDate): Side = if (date in from.start..from.end) Side.From else Side.To
+
+    enum class Side { From, To }
+}
+
+private const val LONG_SWITCH_RATIO = 3

app/src/main/java/de/jeanlucmakiola/calendula/ui/week/WeekPaging.kt

@@ -0,0 +1,107 @@
+package de.jeanlucmakiola.calendula.ui.week
+
+import kotlinx.datetime.DateTimeUnit
+import kotlinx.datetime.DayOfWeek
+import kotlinx.datetime.LocalDate
+import kotlinx.datetime.daysUntil
+import kotlinx.datetime.plus
+
+/** Pages the week pager spans — a little under four centuries, centred on [PAGE_EPOCH]. */
+internal const val WEEK_PAGE_COUNT: Int = 20_000
+
+private const val EPOCH_PAGE = WEEK_PAGE_COUNT / 2
+
+/** The week at [EPOCH_PAGE]; any date works, it only has to stay fixed. */
+private val PAGE_EPOCH = LocalDate(2000, 1, 3)
+
+/** First day of the week shown on pager [page], with weeks starting on [firstDay]. */
+internal fun weekStartForPage(page: Int, firstDay: DayOfWeek): LocalDate =
+    PAGE_EPOCH.startOfWeek(firstDay).plus((page - EPOCH_PAGE) * 7, DateTimeUnit.DAY)
+
+/** The pager page whose week contains [date], with weeks starting on [firstDay]. */
+internal fun weekPageFor(date: LocalDate, firstDay: DayOfWeek): Int {
+    val days = PAGE_EPOCH.startOfWeek(firstDay).daysUntil(date.startOfWeek(firstDay))
+    return (EPOCH_PAGE + days / 7).coerceIn(0, WEEK_PAGE_COUNT - 1)
+}
+
+/** How a timeline pager cuts the calendar into pages of [dayCount] days. */
+sealed interface PageGrid {
+    val dayCount: Int
+    val pageCount: Int
+
+    /** First day shown on pager [page]. */
+    fun startForPage(page: Int): LocalDate
+
+    /** The pager page showing [date]. */
+    fun pageFor(date: LocalDate): Int
+}
+
+/** Whole weeks, starting on [firstDay]. */
+data class WeekGrid(val firstDay: DayOfWeek) : PageGrid {
+    override val dayCount: Int get() = 7
+    override val pageCount: Int get() = WEEK_PAGE_COUNT
+    override fun startForPage(page: Int): LocalDate = weekStartForPage(page, firstDay)
+    override fun pageFor(date: LocalDate): Int = weekPageFor(date, firstDay)
+}
+
+/** Pages the multi-day pager spans — over three centuries at the widest page. */
+internal const val DAYS_PAGE_COUNT: Int = 40_000
+
+private const val DAYS_EPOCH_PAGE = DAYS_PAGE_COUNT / 2
+
+/** A fixed day the multi-day pages are counted from. */
+private val DAYS_EPOCH = LocalDate(2000, 1, 1)
+
+/**
+ * Runs of [dayCount] days (#193), offset [phase] days from a fixed epoch so any
+ * date can start a page. The phase stays put while paging and only changes when
+ * a jump moves another date to the first column.
+ */
+data class DaysGrid(override val dayCount: Int, val phase: Int) : PageGrid {
+    override val pageCount: Int get() = DAYS_PAGE_COUNT
+
+    override fun startForPage(page: Int): LocalDate =
+        DAYS_EPOCH.plus(phase + (page - DAYS_EPOCH_PAGE) * dayCount, DateTimeUnit.DAY)
+
+    override fun pageFor(date: LocalDate): Int =
+        (DAYS_EPOCH_PAGE + Math.floorDiv(DAYS_EPOCH.daysUntil(date) - phase, dayCount))
+            .coerceIn(0, DAYS_PAGE_COUNT - 1)
+
+    companion object {
+        /** The grid of [dayCount]-day pages on which [date] is a page's first day. */
+        fun startingAt(date: LocalDate, dayCount: Int): DaysGrid =
+            DaysGrid(dayCount, Math.floorMod(DAYS_EPOCH.daysUntil(date), dayCount))
+    }
+}
+
+/** Pages the day pager spans — a little under four centuries, centred on [DAY_EPOCH]. */
+internal const val DAY_PAGE_COUNT: Int = 140_000
+
+private const val DAY_EPOCH_PAGE = DAY_PAGE_COUNT / 2
+
+/** The day at [DAY_EPOCH_PAGE]; any date works, it only has to stay fixed. */
+private val DAY_EPOCH = LocalDate(2000, 1, 1)
+
+/** Single days: every date starts a page of its own. */
+data object DayGrid : PageGrid {
+    override val dayCount: Int get() = 1
+    override val pageCount: Int get() = DAY_PAGE_COUNT
+
+    override fun startForPage(page: Int): LocalDate =
+        DAY_EPOCH.plus(page - DAY_EPOCH_PAGE, DateTimeUnit.DAY)
+
+    override fun pageFor(date: LocalDate): Int =
+        (DAY_EPOCH_PAGE + DAY_EPOCH.daysUntil(date)).coerceIn(0, DAY_PAGE_COUNT - 1)
+}
+
+/**
+ * Where the focused date goes when the pager settles on [page] (#184): kept if
+ * the page still shows it, otherwise moved by the pages travelled, so it keeps
+ * its place in the page — the same weekday a week on.
+ */
+internal fun PageGrid.focusOnPage(focus: LocalDate, page: Int): LocalDate {
+    val start = startForPage(page)
+    val end = start.plus(dayCount - 1, DateTimeUnit.DAY)
+    if (focus in start..end) return focus
+    return focus.plus((page - pageFor(focus)) * dayCount, DateTimeUnit.DAY).coerceIn(start, end)
+}

app/src/main/java/de/jeanlucmakiola/calendula/ui/week/WeekViewModel.kt

@@ -9,18 +9,22 @@ import de.jeanlucmakiola.calendula.data.prefs.SettingsPrefs
 import de.jeanlucmakiola.calendula.data.prefs.resolveFirstDay
 import de.jeanlucmakiola.calendula.domain.CalendarSource
 import de.jeanlucmakiola.calendula.domain.EventInstance
+import de.jeanlucmakiola.calendula.domain.displayPriority
 import de.jeanlucmakiola.calendula.domain.FailureReason
 import de.jeanlucmakiola.calendula.domain.calendarListFailure
-import de.jeanlucmakiola.calendula.domain.isDeclined
+import de.jeanlucmakiola.calendula.ui.common.PageStateCache
 import kotlinx.coroutines.CoroutineDispatcher
 import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.SharingStarted
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.catch
 import kotlinx.coroutines.flow.combine
 import kotlinx.coroutines.flow.distinctUntilChanged
+import kotlinx.coroutines.flow.filterNot
 import kotlinx.coroutines.flow.flatMapLatest
+import kotlinx.coroutines.flow.flowOf
 import kotlinx.coroutines.flow.flowOn
 import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.stateIn
@@ -30,6 +34,7 @@ import kotlinx.datetime.LocalDate
 import kotlinx.datetime.TimeZone
 import kotlinx.datetime.atStartOfDayIn
 import kotlinx.datetime.atTime
+import kotlinx.datetime.daysUntil
 import kotlinx.datetime.minus
 import kotlinx.datetime.plus
 import kotlinx.datetime.toInstant
@@ -38,19 +43,42 @@ import java.util.Locale
 import kotlin.time.Clock
 import kotlin.time.Instant
 import javax.inject.Inject
+import kotlin.math.abs
 
 const val MINUTES_PER_DAY: Int = 24 * 60
 
+/** How far from the requested page [PagedTimelineViewModel.span] keeps other pages cached. */
+private const val SPAN_CACHE_DAYS = 28
+
+/** A run of [count] days from [start]: what one timeline page shows. */
+data class DaySpan(val start: LocalDate, val count: Int)
+
+/** How the pager cuts the calendar, and the page the anchor sits on. */
+data class PagerPosition(val grid: PageGrid, val page: Int)
+
+/** Where [anchor] sits under [rule]. */
+fun positionOf(anchor: LocalDate, rule: (LocalDate) -> PageGrid): PagerPosition =
+    rule(anchor).let { PagerPosition(it, it.pageFor(anchor)) }
+
+/**
+ * A timeline paged in runs of days: the week view, and the multi-day view (#193).
+ * The pager leads; the anchor follows it once it settles, and the grid it is
+ * cut by is derived from the anchor through [gridRule], so a subclass decides
+ * whether a jump re-frames the pages or only moves between them.
+ *
+ * @param gridRule the grid to use for a given anchor, as the settings behind it change.
+ * @param initialRule the rule used until [gridRule] first emits.
+ */
 @OptIn(ExperimentalCoroutinesApi::class)
-@HiltViewModel
+abstract class PagedTimelineViewModel(
-class WeekViewModel @Inject constructor(
     private val repository: CalendarRepository,
     settingsPrefs: SettingsPrefs,
-    @IoDispatcher private val io: CoroutineDispatcher,
+    private val io: CoroutineDispatcher,
+    gridRule: Flow<(LocalDate) -> PageGrid>,
+    initialRule: (LocalDate) -> PageGrid,
 ) : ViewModel() {
 
     private val zone = TimeZone.currentSystemDefault()
-    private val locale: Locale = Locale.getDefault()
 
     /** Whether to fade events that have already finished (display concern only). */
     val dimCompletedEvents: StateFlow<Boolean> = settingsPrefs.dimCompletedEvents
@@ -63,76 +91,91 @@ class WeekViewModel @Inject constructor(
     private val todayDate: LocalDate
         get() = Clock.System.now().toLocalDateTime(zone).date
 
-    /** First day of the week, from the Settings preference (AUTO → locale). */
+    // A day on the visible page; the page itself comes from the grid, so a
-    private val weekStart: StateFlow<DayOfWeek> = settingsPrefs.weekStart
+    // settings change re-frames the same days instead of jumping.
-        .map { it.resolveFirstDay(locale) }
-        .stateIn(
-            scope = viewModelScope,
-            started = SharingStarted.WhileSubscribed(5_000L),
-            initialValue = DayOfWeek.MONDAY,
-        )
-
-    // Anchor is a representative day inside the visible week; the actual week
-    // start is derived against [weekStart], so changing the first-day preference
-    // re-frames the same week instead of jumping.
     private val _anchor = MutableStateFlow(todayDate)
+    val anchor: StateFlow<LocalDate> = _anchor
 
-    val weekStartDate: StateFlow<LocalDate> =
+    /**
-        combine(_anchor, weekStart) { anchor, ws -> anchor.startOfWeek(ws) }
+     * The grid for a given anchor, held eagerly so a screen can place its pager
+     * on its very first frame rather than a frame after the anchor moved.
+     */
+    val rule: StateFlow<(LocalDate) -> PageGrid> =
+        gridRule.stateIn(viewModelScope, SharingStarted.Eagerly, initialRule)
+
+    private val position: StateFlow<PagerPosition> =
+        combine(_anchor, rule) { anchor, rule -> positionOf(anchor, rule) }
+            .distinctUntilChanged()
             .stateIn(
                 scope = viewModelScope,
                 started = SharingStarted.WhileSubscribed(5_000L),
-                initialValue = todayDate.startOfWeek(DayOfWeek.MONDAY),
+                initialValue = positionOf(todayDate, initialRule),
             )
 
+    /**
+     * The anchor page's state. Once loaded it never falls back to [WeekUiState.Loading]:
+     * moving the anchor keeps the last result until the new page arrives, since
+     * the pages draw their own days and this only gates the failure screen.
+     */
     val state: StateFlow<WeekUiState> =
-        combine(_anchor, weekStart) { anchor, ws -> anchor.startOfWeek(ws) }
+        position.map { DaySpan(it.grid.startForPage(it.page), it.grid.dayCount) }
             .distinctUntilChanged()
-            .flatMapLatest { start ->
+            .flatMapLatest { span -> span(span).filterNot { it is WeekUiState.Loading } }
-                val range = weekRange(start, zone)
-                combine(
-                    repository.calendars(),
-                    repository.instances(range),
-                ) { calendars, instances ->
-                    buildState(start, calendars, instances)
-                }
-            }
             .catch { emit(WeekUiState.Failure(FailureReason.ProviderUnavailable)) }
-            .flowOn(io)
             .stateIn(
                 scope = viewModelScope,
                 started = SharingStarted.WhileSubscribed(5_000L),
                 initialValue = WeekUiState.Loading,
             )
 
-    fun goToPrev() {
+    private val spans = PageStateCache<DaySpan, WeekUiState>(
-        _anchor.value = _anchor.value.minus(7, DateTimeUnit.DAY)
+        scope = viewModelScope,
+        initial = WeekUiState.Loading,
+        // Far enough to cover the pages either side and a swipe back, so paging
+        // through a year doesn't keep a year of queries around.
+        keep = { cached, requested ->
+            cached.count == requested.count &&
+                abs(cached.start.daysUntil(requested.start)) <= SPAN_CACHE_DAYS
+        },
+    ) { span ->
+        combine(
+            repository.calendars(),
+            repository.instances(spanRange(span.start, span.count, zone)),
+        ) { calendars, instances ->
+            buildState(span, calendars, instances)
+        }
+            .catch { emit(WeekUiState.Failure(FailureReason.ProviderUnavailable)) }
+            .flowOn(io)
     }
 
-    fun goToNext() {
+    /** The days of one page, shared between that page and [state]. Main thread only. */
-        _anchor.value = _anchor.value.plus(7, DateTimeUnit.DAY)
+    fun span(span: DaySpan): StateFlow<WeekUiState> = spans.get(span)
+
+    /** The pager came to rest on [page]; follow it unless it is already the anchor's. */
+    fun onPageSettled(page: Int) {
+        val grid = rule.value(_anchor.value)
+        if (grid.pageFor(_anchor.value) != page) _anchor.value = grid.startForPage(page)
     }
 
-    fun goToToday() {
+    /** Move the anchor to [date], re-framing the pages if the grid depends on it. */
-        _anchor.value = todayDate
+    fun jumpTo(date: LocalDate) {
-    }
-
-    /** Jump to the week containing [date] (drawer jump-to-date). */
-    fun goToDate(date: LocalDate) {
         _anchor.value = date
     }
 
+    fun goToToday() = jumpTo(todayDate)
+    fun goToDate(date: LocalDate) = jumpTo(date)
+
     private fun buildState(
-        start: LocalDate,
+        span: DaySpan,
         calendars: List<CalendarSource>,
         instances: List<EventInstance>,
     ): WeekUiState {
         calendarListFailure(calendars)?.let { return WeekUiState.Failure(it) }
-        val days = (0 until 7).map { start.plus(it, DateTimeUnit.DAY) }
+        val days = (0 until span.count).map { span.start.plus(it, DateTimeUnit.DAY) }
         val allDay = instances.filter { it.isAllDay }
         val timed = instances.filterNot { it.isAllDay }
         return WeekUiState.Success(
-            weekStart = start,
+            weekStart = span.start,
             today = todayDate,
             days = days,
             allDaySpans = layoutAllDay(allDay, days, zone),
@@ -141,6 +184,58 @@ class WeekViewModel @Inject constructor(
     }
 }
 
+/** Whole weeks, starting on the first day from Settings (AUTO → locale). */
+@HiltViewModel
+class WeekViewModel @Inject constructor(
+    repository: CalendarRepository,
+    settingsPrefs: SettingsPrefs,
+    @IoDispatcher io: CoroutineDispatcher,
+) : PagedTimelineViewModel(
+    repository = repository,
+    settingsPrefs = settingsPrefs,
+    io = io,
+    gridRule = settingsPrefs.weekStart.map { pref ->
+        val grid = WeekGrid(pref.resolveFirstDay(Locale.getDefault()))
+        val rule: (LocalDate) -> PageGrid = { grid }
+        rule
+    },
+    initialRule = { WeekGrid(DayOfWeek.MONDAY) },
+)
+
+/**
+ * The multi-day view (#193): runs of the day count from Settings, with the
+ * anchor always a page's first day, so today — or a date jumped to — opens in
+ * the first column.
+ */
+@HiltViewModel
+class MultiDayViewModel @Inject constructor(
+    repository: CalendarRepository,
+    settingsPrefs: SettingsPrefs,
+    @IoDispatcher io: CoroutineDispatcher,
+) : PagedTimelineViewModel(
+    repository = repository,
+    settingsPrefs = settingsPrefs,
+    io = io,
+    gridRule = settingsPrefs.multiDayCount.map { count ->
+        { anchor: LocalDate -> DaysGrid.startingAt(anchor, count) }
+    },
+    initialRule = { DaysGrid.startingAt(it, SettingsPrefs.DEFAULT_MULTI_DAY_COUNT) },
+)
+
+/** The day view: the timeline one day at a time. */
+@HiltViewModel
+class DayViewModel @Inject constructor(
+    repository: CalendarRepository,
+    settingsPrefs: SettingsPrefs,
+    @IoDispatcher io: CoroutineDispatcher,
+) : PagedTimelineViewModel(
+    repository = repository,
+    settingsPrefs = settingsPrefs,
+    io = io,
+    gridRule = flowOf { _: LocalDate -> DayGrid },
+    initialRule = { DayGrid },
+)
+
 /**
  * Lay out all-day events as connected horizontal spans across the visible week.
  * Each event becomes one [AllDaySpan] from its first to its last covered column;
@@ -160,7 +255,13 @@ internal fun layoutAllDay(
         }
         // Declined bars are packed after every other one, so on any day they
         // cover they land in a lane below it (#230).
-        .sortedWith(compareBy({ it.event.isDeclined }, { it.startCol }, { it.endCol }))
+        .sortedWith(
+            compareBy<Raw> { it.event.displayPriority(zone) }
+                .thenBy { it.startCol }
+                .thenBy { it.endCol }
+                .thenBy { it.event.start }
+                .thenBy { it.event.instanceId },
+        )
 
     // What each lane already holds, rather than just how far right it reaches.
     // A single "last occupied column" only answers correctly while spans arrive
@@ -194,10 +295,10 @@ internal fun LocalDate.startOfWeek(weekStart: DayOfWeek): LocalDate {
     return minus(offset, DateTimeUnit.DAY)
 }
 
-/** Half-open instant range covering the seven days starting at [start]. */
+/** Instant range covering the [count] days starting at [start]. */
-internal fun weekRange(start: LocalDate, zone: TimeZone): ClosedRange<Instant> {
+internal fun spanRange(start: LocalDate, count: Int, zone: TimeZone): ClosedRange<Instant> {
     val from = start.atStartOfDayIn(zone)
-    val to = start.plus(6, DateTimeUnit.DAY).atTime(23, 59, 59).toInstant(zone)
+    val to = start.plus(count - 1, DateTimeUnit.DAY).atTime(23, 59, 59).toInstant(zone)
     return from..to
 }
 

app/src/main/java/de/jeanlucmakiola/calendula/ui/week/WeekViewPreview.kt

@@ -32,10 +32,13 @@ internal fun WeekViewPreview(
     weekStart: DayOfWeek,
     height: Dp,
     modifier: Modifier = Modifier,
+    dayCount: Int = 7,
 ) {
     val zone = remember { TimeZone.currentSystemDefault() }
     val today = remember(zone) { Clock.System.now().toLocalDateTime(zone).date }
-    val state = remember(today, weekStart, zone) { sampleWeekState(today, weekStart, zone) }
+    val state = remember(today, weekStart, dayCount, zone) {
+        sampleWeekState(today, weekStart, dayCount, zone)
+    }
     val scrollState = rememberScrollState()
     LaunchedEffect(Unit) {
         snapshotFlow { scrollState.maxValue }.first { it > 0 }
@@ -46,6 +49,8 @@ internal fun WeekViewPreview(
     ScaledViewPreview(height = height, modifier = modifier) {
         WeekSuccess(
             state = state,
+            showWeekNumber = dayCount == 7,
+            headerBias = if (dayCount == 1) TimelineKind.Day.headerBias else 0f,
             scrollState = scrollState,
             allDayHeight = state.allDayStripHeight(),
             dragController = rememberTimelineDragController(),
@@ -61,10 +66,11 @@ internal fun WeekViewPreview(
 private fun sampleWeekState(
     today: LocalDate,
     weekStart: DayOfWeek,
+    dayCount: Int,
     zone: TimeZone,
 ): WeekUiState.Success {
-    val start = today.startOfWeek(weekStart)
+    val start = if (dayCount == 7) today.startOfWeek(weekStart) else today
-    val days = (0 until 7).map { start.plus(it, DateTimeUnit.DAY) }
+    val days = (0 until dayCount).map { start.plus(it, DateTimeUnit.DAY) }
     val events = sampleTimelineEvents(days, today, zone)
     return WeekUiState.Success(
         weekStart = start,

app/src/main/res/values/strings.xml

@@ -1,10 +1,10 @@
 <resources>
     <string name="app_name">Calendula</string>
     <string name="app_tagline">A modern calendar.</string>
-    <!-- Alternative launcher label offered by the "App name" setting (issue #44).
+    <!-- Alternative launcher label offered by the "App name" setting (issue #44),
-         translatable="false": this string becomes a launcher component's label, so
+         shown under the app icon. Translate it as the plain, generic word your
-         it must never be changed by an unreviewed community translation. -->
+         language uses for a calendar app (e.g. "Kalender"), nothing else (#251). -->
-    <string name="app_name_calendar_alias" translatable="false">Calendar</string>
+    <string name="app_name_calendar_alias">Calendar</string>
 
     <!-- Loading / Failure / Success generic strings (used across screens) -->
     <string name="state_loading">Loading…</string>
@@ -54,7 +54,9 @@
     <!-- Month view (S1) -->
     <string name="month_prev">Previous month</string>
     <string name="month_next">Next month</string>
+    <string name="month_open_week">Open week %1$d</string>
     <string name="month_today_action">Today</string>
+    <string name="month_split_clear_filter">Show full month agenda</string>
     <string name="month_more_actions">More actions</string>
     <string name="month_open_menu">Open menu</string>
     <string name="month_action_settings">Settings</string>
@@ -67,6 +69,10 @@
     <!-- Day view (S3) -->
     <string name="day_today_action">Today</string>
 
+    <!-- Week and day timelines — edge bar for events scrolled out of view (#188) -->
+    <string name="timeline_earlier_events">Earlier events</string>
+    <string name="timeline_later_events">Later events</string>
+
     <!-- Event detail screen (S4) -->
     <string name="event_detail_back">Back</string>
     <string name="event_detail_edit">Edit</string>
@@ -349,12 +355,18 @@
     <string name="reminder_action_snooze">Snooze</string>
     <string name="reminder_action_dismiss">Dismiss</string>
     <!-- Day context prefix in a reminder for an event on another day (v2.15.0) -->
+    <string name="reminder_day_today">Today</string>
     <string name="reminder_day_tomorrow">Tomorrow</string>
     <string name="reminder_day_yesterday">Yesterday</string>
 
     <!-- View switcher (M1) -->
     <string name="view_month">Month</string>
     <string name="view_week">Week</string>
+    <!-- The multi-day view, named after how many days it shows (#193) -->
+    <plurals name="view_multi_day">
+        <item quantity="one">%d day</item>
+        <item quantity="other">%d days</item>
+    </plurals>
     <string name="view_day">Day</string>
     <string name="view_agenda">Agenda</string>
     <string name="view_section">View</string>
@@ -470,7 +482,10 @@
          each hour") describes a feature that no longer exists and needs redoing. -->
     <string name="settings_hour_lines">Hour grid</string>
     <string name="settings_hour_lines_summary">Seat each hour in its own cell in week and day view</string>
+    <string name="settings_multi_day_count">Multi-day view</string>
+    <string name="settings_multi_day_count_hint">How many days the multi-day view shows side by side. Today opens in the first column.</string>
     <string name="settings_timeline_scale">Hour height</string>
+    <string name="settings_timeline_scale_by_visible_hours">Set by Visible hours</string>
     <string name="settings_timeline_scale_hint">How much vertical space one hour takes in week and day view. Both views share this setting. You can also pinch the timeline with two fingers to set any height in between.</string>
     <string name="timeline_scale_fit_day">Fit whole day</string>
     <string name="timeline_scale_fit_day_summary">All 24 hours on one screen, no scrolling</string>
@@ -482,6 +497,13 @@
     <string name="timeline_scale_comfortable_summary">Roomier blocks, more scrolling</string>
     <string name="timeline_scale_custom">Custom</string>
     <string name="timeline_scale_custom_summary">The height you pinched the timeline to</string>
+    <string name="settings_visible_hours">Visible hours</string>
+    <string name="settings_visible_hours_summary">Fit a range of hours to the screen when week, multi-day or day view opens</string>
+    <string name="settings_visible_hours_on_summary">%1$s – %2$s fills the screen when a view opens</string>
+    <string name="settings_visible_hours_start">From</string>
+    <string name="settings_visible_hours_end">Until</string>
+    <string name="settings_visible_hours_start_hint">The hour at the top of the screen when week, multi-day or day view opens. Earlier hours are still a scroll away.</string>
+    <string name="settings_visible_hours_end_hint">The hour at the bottom of the screen when a view opens. Later hours are still a scroll away, and pinching zooms until the view is opened again.</string>
     <string name="settings_dim_completed">Dim completed events</string>
     <string name="settings_dim_completed_summary">Fade events that have already ended in month and week view</string>
     <string name="settings_drag_to_reschedule">Drag to reschedule</string>
@@ -530,7 +552,7 @@
     <string name="settings_month_header">Month view</string>
     <string name="settings_month_view_style">Month view style</string>
     <string name="month_style_paged">Pages</string>
-    <string name="month_style_paged_summary">One month fills the screen. Swipe left or right to change month.</string>
+    <string name="month_style_paged_summary">One month fills the screen. Swipe left or right to change month, or swipe up to show the month agenda.</string>
     <string name="month_style_continuous">Scrolling months</string>
     <string name="month_style_continuous_summary">Each month sits under its own heading, with a little space setting it apart from the next.</string>
     <string name="month_style_dense">Seamless weeks</string>

app/src/test/java/de/jeanlucmakiola/calendula/data/prefs/SettingsPrefsTest.kt

@@ -14,6 +14,7 @@ import de.jeanlucmakiola.calendula.ui.agenda.AgendaRange
 import de.jeanlucmakiola.calendula.ui.common.CalendarView
 import de.jeanlucmakiola.calendula.ui.common.IMPLEMENTED_VIEWS
 import de.jeanlucmakiola.calendula.ui.common.QuickSwitchConfig
+import de.jeanlucmakiola.calendula.ui.common.TimelineHours
 import de.jeanlucmakiola.calendula.ui.common.TimelineScale
 import de.jeanlucmakiola.calendula.ui.month.MonthViewStyle
 import kotlinx.coroutines.flow.first
@@ -125,6 +126,24 @@ class SettingsPrefsTest {
         assertThat(prefs.timelineScale.first()).isEqualTo(TimelineScale.Comfortable)
     }
 
+    @Test
+    fun `visible hours default off and round-trip`(@TempDir tempDir: Path) = runTest {
+        val prefs = SettingsPrefs(newDataStore(tempDir))
+        assertThat(prefs.timelineHours.first()).isEqualTo(TimelineHours(enabled = false, 7, 22))
+        prefs.setTimelineHours(TimelineHours(enabled = true, 6, 20))
+        assertThat(prefs.timelineHours.first()).isEqualTo(TimelineHours(enabled = true, 6, 20))
+        // Switching off keeps the chosen hours for next time.
+        prefs.setTimelineHours(TimelineHours(enabled = false, 6, 20))
+        assertThat(prefs.timelineHours.first()).isEqualTo(TimelineHours(enabled = false, 6, 20))
+    }
+
+    @Test
+    fun `visible hours are stored valid`(@TempDir tempDir: Path) = runTest {
+        val prefs = SettingsPrefs(newDataStore(tempDir))
+        prefs.setTimelineHours(TimelineHours(enabled = true, 23, 22))
+        assertThat(prefs.timelineHours.first()).isEqualTo(TimelineHours(enabled = true, 20, 22))
+    }
+
     @Test
     fun `week numbers default off and round-trips`(@TempDir tempDir: Path) = runTest {
         val prefs = SettingsPrefs(newDataStore(tempDir))
@@ -235,7 +254,8 @@ class SettingsPrefsTest {
         prefs.setQuickSwitchConfig(config)
         val loaded = prefs.quickSwitchConfig.first()
         assertThat(loaded.order).containsExactly(
-            CalendarView.Agenda, CalendarView.Month, CalendarView.Week, CalendarView.Day,
+            CalendarView.Agenda, CalendarView.Month, CalendarView.Week,
+            CalendarView.MultiDay, CalendarView.Day,
         ).inOrder()
         assertThat(loaded.enabled).containsExactly(CalendarView.Agenda, CalendarView.Month)
         assertThat(loaded.cycle).containsExactly(CalendarView.Agenda, CalendarView.Month).inOrder()
@@ -252,13 +272,14 @@ class SettingsPrefsTest {
             m
         }
         val config = prefs.quickSwitchConfig.first()
-        // Stored order first (Day, Week), then the omitted views in default order.
+        // Stored order first, with the new view after Week.
         assertThat(config.order).containsExactly(
-            CalendarView.Day, CalendarView.Week, CalendarView.Month, CalendarView.Agenda,
+            CalendarView.Day, CalendarView.Week, CalendarView.MultiDay,
+            CalendarView.Month, CalendarView.Agenda,
         ).inOrder()
-        // Day was explicitly disabled; the appended Month & Agenda default enabled.
+        // Day was explicitly disabled; the missing views default enabled.
         assertThat(config.enabled).containsExactly(
-            CalendarView.Week, CalendarView.Month, CalendarView.Agenda,
+            CalendarView.Week, CalendarView.MultiDay, CalendarView.Month, CalendarView.Agenda,
         )
     }
 
@@ -272,9 +293,12 @@ class SettingsPrefsTest {
         val newOrder = listOf(CalendarView.Agenda, CalendarView.Month, CalendarView.Week, CalendarView.Day)
         prefs.updateQuickSwitch { it.copy(order = newOrder) }
         val config = prefs.quickSwitchConfig.first()
-        assertThat(config.order).containsExactlyElementsIn(newOrder).inOrder()
+        assertThat(config.order).containsExactly(
-        assertThat(config.enabled).containsExactly(
             CalendarView.Agenda, CalendarView.Month, CalendarView.Week,
+            CalendarView.MultiDay, CalendarView.Day,
+        ).inOrder()
+        assertThat(config.enabled).containsExactly(
+            CalendarView.Agenda, CalendarView.Month, CalendarView.Week, CalendarView.MultiDay,
         )
     }
 
@@ -286,7 +310,8 @@ class SettingsPrefsTest {
             listOf(CalendarView.Agenda, CalendarView.Day, CalendarView.Week, CalendarView.Month),
         )
         assertThat(prefs.drawerViewOrder.first()).containsExactly(
-            CalendarView.Agenda, CalendarView.Day, CalendarView.Week, CalendarView.Month,
+            CalendarView.Agenda, CalendarView.Day, CalendarView.Week,
+            CalendarView.MultiDay, CalendarView.Month,
         ).inOrder()
     }
 
@@ -300,7 +325,8 @@ class SettingsPrefsTest {
             m
         }
         assertThat(prefs.drawerViewOrder.first()).containsExactly(
-            CalendarView.Agenda, CalendarView.Week, CalendarView.Month, CalendarView.Day,
+            CalendarView.Agenda, CalendarView.Week, CalendarView.MultiDay,
+            CalendarView.Month, CalendarView.Day,
         ).inOrder()
     }
 

app/src/test/java/de/jeanlucmakiola/calendula/data/reminders/ReminderTimeTextTest.kt

@@ -38,6 +38,7 @@ class ReminderTimeTextTest {
         is24Hour = is24Hour,
         today = today ?: java.time.Instant.ofEpochMilli(beginMillis).atZone(zone).toLocalDate(),
         firstDayOfWeek = firstDayOfWeek,
+        todayLabel = "Today",
         tomorrowLabel = "Tomorrow",
         yesterdayLabel = "Yesterday",
     )
@@ -130,38 +131,74 @@ class ReminderTimeTextTest {
     }
 
     @Test
-    fun `all-day single day shows one date, read in UTC`() {
+    fun `all-day single day today reads as today, read in UTC`() {
         val text = text(
             beginMillis = utcMidnight(LocalDate.of(2026, 6, 11)),
             endMillis = utcMidnight(LocalDate.of(2026, 6, 12)),
             isAllDay = true,
             // Zone must not matter for all-day events: UTC midnight is
-            // 02:00 in Berlin — naive local reading would shift the day.
+            // the previous evening in Los Angeles — naive local reading would shift the day.
+            zone = ZoneId.of("America/Los_Angeles"),
             today = LocalDate.of(2026, 6, 11),
         )
-        assertThat(text).isEqualTo("11.06.2026")
+        assertThat(text).isEqualTo("Today")
     }
 
     @Test
-    fun `all-day event tomorrow still shows the exact date, no relative prefix`() {
+    fun `all-day event tomorrow reads as tomorrow`() {
         val text = text(
             beginMillis = utcMidnight(LocalDate.of(2026, 6, 12)),
             endMillis = utcMidnight(LocalDate.of(2026, 6, 13)),
             isAllDay = true,
             today = LocalDate.of(2026, 6, 11),
         )
-        assertThat(text).isEqualTo("12.06.2026")
+        assertThat(text).isEqualTo("Tomorrow")
     }
 
     @Test
-    fun `all-day multi-day shows the last covered day, not the exclusive end`() {
+    fun `all-day event later this week reads as the short weekday`() {
+        // 2026-06-11 is a Thursday; Saturday the 13th shares its week.
         val text = text(
-            beginMillis = utcMidnight(LocalDate.of(2026, 6, 11)),
+            beginMillis = utcMidnight(LocalDate.of(2026, 6, 13)),
-            endMillis = utcMidnight(LocalDate.of(2026, 6, 13)),
+            endMillis = utcMidnight(LocalDate.of(2026, 6, 14)),
+            isAllDay = true,
+            locale = Locale.US,
+            today = LocalDate.of(2026, 6, 11),
+        )
+        assertThat(text).isEqualTo("Sat")
+    }
+
+    @Test
+    fun `all-day event next week falls back to the exact date`() {
+        val text = text(
+            beginMillis = utcMidnight(LocalDate.of(2026, 6, 16)),
+            endMillis = utcMidnight(LocalDate.of(2026, 6, 17)),
             isAllDay = true,
             today = LocalDate.of(2026, 6, 11),
         )
-        assertThat(text).isEqualTo("11.06.2026 – 12.06.2026")
+        assertThat(text).isEqualTo("16.06.2026")
+    }
+
+    @Test
+    fun `all-day multi-day reads relative start and the last covered day`() {
+        val text = text(
+            beginMillis = utcMidnight(LocalDate.of(2026, 6, 12)),
+            endMillis = utcMidnight(LocalDate.of(2026, 6, 14)),
+            isAllDay = true,
+            today = LocalDate.of(2026, 6, 11),
+        )
+        assertThat(text).isEqualTo("Tomorrow – 13.06.2026")
+    }
+
+    @Test
+    fun `all-day multi-day further out keeps both dates`() {
+        val text = text(
+            beginMillis = utcMidnight(LocalDate.of(2026, 7, 1)),
+            endMillis = utcMidnight(LocalDate.of(2026, 7, 3)),
+            isAllDay = true,
+            today = LocalDate.of(2026, 6, 11),
+        )
+        assertThat(text).isEqualTo("01.07.2026 – 02.07.2026")
     }
 
     @Test
@@ -173,6 +210,6 @@ class ReminderTimeTextTest {
             isAllDay = true,
             today = LocalDate.of(2026, 6, 11),
         )
-        assertThat(text).isEqualTo("11.06.2026")
+        assertThat(text).isEqualTo("Today")
     }
 }

app/src/test/java/de/jeanlucmakiola/calendula/domain/color/EventToneTest.kt

@@ -156,4 +156,5 @@ class EventToneTest {
         assertThat(eventTone(0xFFFFF6C0.toInt(), dark = false, harmonise = false).onContainer)
             .isEqualTo(0xFF000000.toInt())
     }
+
 }

app/src/test/java/de/jeanlucmakiola/calendula/ui/agenda/AgendaItemDatesTest.kt

@@ -0,0 +1,40 @@
+package de.jeanlucmakiola.calendula.ui.agenda
+
+import com.google.common.truth.Truth.assertThat
+import de.jeanlucmakiola.calendula.domain.EventInstance
+import kotlinx.datetime.LocalDate
+import kotlin.time.Instant
+import org.junit.jupiter.api.Test
+
+/** The day each agenda list item belongs to, for the focus it hands back (#184). */
+class AgendaItemDatesTest {
+
+    private val monday = LocalDate(2026, 9, 28)
+    private val tuesday = LocalDate(2026, 9, 29)
+
+    private fun event(id: Long) = EventInstance(
+        instanceId = id,
+        eventId = id,
+        calendarId = 1L,
+        title = "Event",
+        start = Instant.fromEpochMilliseconds(0),
+        end = Instant.fromEpochMilliseconds(0),
+        isAllDay = false,
+        color = 0xFF000000.toInt(),
+        location = null,
+    )
+
+    @Test
+    fun `each day counts its header, events and gap`() {
+        val days = listOf(AgendaDay(monday, listOf(event(1), event(2))), AgendaDay(tuesday, listOf(event(3))))
+        assertThat(agendaItemDates(days)).containsExactly(
+            monday, monday, monday, monday,
+            tuesday, tuesday, tuesday,
+        ).inOrder()
+    }
+
+    @Test
+    fun `an empty day counts its placeholder`() {
+        assertThat(agendaItemDates(listOf(AgendaDay(monday, emptyList())))).hasSize(3)
+    }
+}

app/src/test/java/de/jeanlucmakiola/calendula/ui/agenda/GroupAgendaDaysTest.kt

@@ -77,6 +77,16 @@ class GroupAgendaDaysTest {
             .containsExactly(LocalDate(2026, 7, 2))
     }
 
+    @Test
+    fun `multi-day events precede single all-day and timed events`() {
+        val multi = event(1, "Multi", at(2026, 7, 1), at(2026, 7, 4), isAllDay = true)
+        val single = event(2, "Single", at(2026, 7, 2), at(2026, 7, 3), isAllDay = true)
+        val timed = event(3, "Timed", at(2026, 7, 2, 8), at(2026, 7, 2, 9))
+        val second = days(listOf(timed, single, multi)).first { it.date == LocalDate(2026, 7, 2) }
+        assertThat(second.events.map { it.title })
+            .containsExactly("Multi", "Single", "Timed").inOrder()
+    }
+
     @Test
     fun `an event ending exactly at midnight does not reach the next day`() {
         val e = event(1, "late", at(2026, 7, 1, 22, 0), at(2026, 7, 2, 0, 0))

app/src/test/java/de/jeanlucmakiola/calendula/ui/common/OutOfViewEdgesTest.kt

@@ -0,0 +1,147 @@
+package de.jeanlucmakiola.calendula.ui.common
+
+import com.google.common.truth.Truth.assertThat
+import de.jeanlucmakiola.calendula.domain.EventInstance
+import de.jeanlucmakiola.calendula.ui.week.TimedBlock
+import kotlin.time.Instant
+import org.junit.jupiter.api.Test
+
+/** Which events a column's edge bars point at, and where a tap scrolls (#188). */
+class OutOfViewEdgesTest {
+
+    private fun block(id: Long, startMin: Int, endMin: Int) = TimedBlock(
+        event = EventInstance(
+            instanceId = id,
+            eventId = id,
+            calendarId = 1L,
+            title = "Event $id",
+            start = Instant.fromEpochMilliseconds(0),
+            end = Instant.fromEpochMilliseconds(0),
+            isAllDay = false,
+            color = 0xFF112233.toInt(),
+            location = null,
+        ),
+        startMin = startMin,
+        endMin = endMin,
+        lane = 0,
+        laneCount = 1,
+    )
+
+    private val early = block(1, 7 * 60, 8 * 60)
+    private val breakfast = block(2, 8 * 60, 9 * 60)
+    private val lunch = block(3, 12 * 60, 13 * 60)
+    private val dinner = block(4, 19 * 60, 20 * 60)
+    private val late = block(5, 21 * 60, 22 * 60)
+
+    // Viewport 10:00–17:00.
+    private fun outOf(vararg blocks: TimedBlock) =
+        outOfViewEvents(blocks.toList(), topMin = 600f, bottomMin = 1020f)
+
+    @Test
+    fun `the nearest hidden event on each side is picked`() {
+        val events = outOf(early, breakfast, lunch, dinner, late)
+        assertThat(events.above).isEqualTo(breakfast)
+        assertThat(events.below).isEqualTo(dinner)
+    }
+
+    @Test
+    fun `an event in view points nowhere`() {
+        assertThat(outOf(lunch)).isEqualTo(OutOfViewEvents.None)
+    }
+
+    @Test
+    fun `an event cut by the edge is not out of view`() {
+        val straddling = block(6, 9 * 60, 11 * 60)
+        assertThat(outOf(straddling).above).isNull()
+    }
+
+    @Test
+    fun `an event disappears from the edge as soon as a sliver enters view`() {
+        val sliver = block(6, 9 * 60, 10 * 60 + 5)
+        assertThat(outOf(sliver).above).isNull()
+        val tip = block(7, 17 * 60 - 5, 18 * 60)
+        assertThat(outOf(tip).below).isNull()
+        val justAbove = block(8, 9 * 60, 10 * 60)
+        val justBelow = block(9, 17 * 60, 18 * 60)
+        assertThat(outOf(justAbove).above).isEqualTo(justAbove)
+        assertThat(outOf(justBelow).below).isEqualTo(justBelow)
+    }
+
+    @Test
+    fun `the bar fades before its event reaches the viewport`() {
+        assertThat(edgeBarAlpha(gapPx = 24f, fadeLeadPx = 24f)).isEqualTo(1f)
+        assertThat(edgeBarAlpha(gapPx = 12f, fadeLeadPx = 24f)).isEqualTo(0.5f)
+        assertThat(edgeBarAlpha(gapPx = 0f, fadeLeadPx = 24f)).isEqualTo(0f)
+        assertThat(edgeBarAlpha(gapPx = -1f, fadeLeadPx = 24f)).isEqualTo(0f)
+    }
+
+    @Test
+    fun `a column scrolled to its top points at nothing above it`() {
+        val first = block(6, 0, 30)
+        val events = outOfViewEvents(listOf(first), topMin = 0f, bottomMin = 420f)
+        assertThat(events.above).isNull()
+    }
+
+    @Test
+    fun `a short event is judged by the height it renders at`() {
+        // Five minutes ending at 09:58 still draws 26 minutes tall, past 10:00.
+        val blip = block(6, 9 * 60 + 53, 9 * 60 + 58)
+        assertThat(outOf(blip).above).isNull()
+    }
+
+    @Test
+    fun `an event above scrolls to its start less the margin`() {
+        val target = revealScrollTarget(breakfast, ViewportEdge.Top, hourPx = 100f, viewportPx = 700, marginPx = 20f, maxScroll = 1700)
+        assertThat(target).isEqualTo(780)
+    }
+
+    @Test
+    fun `an event below that fits lands whole at the bottom`() {
+        val target = revealScrollTarget(dinner, ViewportEdge.Bottom, hourPx = 100f, viewportPx = 700, marginPx = 20f, maxScroll = 1700)
+        // Its end, 2000, plus the margin, sits at the viewport's bottom.
+        assertThat(target).isEqualTo(1320)
+    }
+
+    @Test
+    fun `an event below taller than the viewport lands with its start at the top`() {
+        val long = block(6, 12 * 60, 22 * 60)
+        val target = revealScrollTarget(long, ViewportEdge.Bottom, hourPx = 100f, viewportPx = 700, marginPx = 20f, maxScroll = 1700)
+        assertThat(target).isEqualTo(1180)
+    }
+
+    @Test
+    fun `the target stays within the scroll range`() {
+        val first = block(6, 0, 30)
+        assertThat(
+            revealScrollTarget(first, ViewportEdge.Top, hourPx = 100f, viewportPx = 700, marginPx = 20f, maxScroll = 1700),
+        ).isEqualTo(0)
+        val last = block(7, 23 * 60, 24 * 60)
+        assertThat(
+            revealScrollTarget(last, ViewportEdge.Bottom, hourPx = 100f, viewportPx = 700, marginPx = 20f, maxScroll = 1700),
+        ).isEqualTo(1700)
+    }
+
+    // Viewport 1000..1700 px with both bars showing, 40 px of reach.
+    private fun tapped(y: Float, events: OutOfViewEvents = OutOfViewEvents(breakfast, dinner)) =
+        tappedEdge(events, y, viewportTop = 1000f, viewportPx = 700, reachPx = 40f)
+
+    @Test
+    fun `a tap near an edge with a bar hits that bar`() {
+        assertThat(tapped(1010f)).isEqualTo(ViewportEdge.Top)
+        assertThat(tapped(1040f)).isEqualTo(ViewportEdge.Top)
+        assertThat(tapped(1690f)).isEqualTo(ViewportEdge.Bottom)
+    }
+
+    @Test
+    fun `a tap past the bar's reach is left to the column`() {
+        assertThat(tapped(1041f)).isNull()
+        assertThat(tapped(1350f)).isNull()
+        assertThat(tapped(1659f)).isNull()
+    }
+
+    @Test
+    fun `a tap near an edge without a bar is left to the column`() {
+        assertThat(tapped(1010f, OutOfViewEvents(null, dinner))).isNull()
+        assertThat(tapped(1690f, OutOfViewEvents(breakfast, null))).isNull()
+    }
+}

app/src/test/java/de/jeanlucmakiola/calendula/ui/common/PageStateCacheTest.kt

@@ -0,0 +1,53 @@
+package de.jeanlucmakiola.calendula.ui.common
+
+import com.google.common.truth.Truth.assertThat
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.awaitCancellation
+import kotlinx.coroutines.flow.flow
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.test.UnconfinedTestDispatcher
+import kotlinx.coroutines.test.runTest
+import org.junit.jupiter.api.Test
+import kotlin.math.abs
+
+@OptIn(ExperimentalCoroutinesApi::class)
+class PageStateCacheTest {
+
+    @Test
+    fun `the same key shares one state`() = runTest {
+        val cache = PageStateCache<Int, Int>(backgroundScope, 0, { a, b -> abs(a - b) <= 1 }) { flow { emit(it) } }
+        assertThat(cache.get(5)).isSameInstanceAs(cache.get(5))
+    }
+
+    @Test
+    fun `a dropped entry stops loading`() = runTest(UnconfinedTestDispatcher()) {
+        var running = 0
+        val cache = PageStateCache<Int, Int>(backgroundScope, 0, { a, b -> abs(a - b) <= 1 }) { key ->
+            flow {
+                running++
+                try {
+                    emit(key)
+                    awaitCancellation()
+                } finally {
+                    running--
+                }
+            }
+        }
+        backgroundScope.launch { cache.get(0).collect {} }
+        assertThat(running).isEqualTo(1)
+
+        // Far enough away that 0 is let go, even though it is still collected.
+        cache.get(10)
+        assertThat(running).isEqualTo(0)
+        assertThat(cache.size).isEqualTo(1)
+    }
+
+    @Test
+    fun `nearby entries are kept`() = runTest {
+        val cache = PageStateCache<Int, Int>(backgroundScope, 0, { a, b -> abs(a - b) <= 2 }) { flow { emit(it) } }
+        cache.get(4)
+        cache.get(5)
+        cache.get(6)
+        assertThat(cache.size).isEqualTo(3)
+    }
+}

app/src/test/java/de/jeanlucmakiola/calendula/ui/common/TimelineHoursTest.kt

@@ -0,0 +1,115 @@
+package de.jeanlucmakiola.calendula.ui.common
+
+import androidx.compose.ui.unit.dp
+import com.google.common.truth.Truth.assertThat
+import org.junit.jupiter.api.Test
+
+class TimelineHoursTest {
+
+    private val viewport = 600.dp
+
+    @Test
+    fun `the chosen range exactly fills the viewport`() {
+        // 07–22 is 15 hours: 600dp / 15 = 40dp an hour.
+        assertThat(TimelineScale.FitHours(7, 22).hourHeight(viewport)).isEqualTo(40.dp)
+    }
+
+    @Test
+    fun `the whole day fits like FitDay`() {
+        assertThat(TimelineScale.FitHours(0, 24).hourHeight(viewport))
+            .isEqualTo(TimelineScale.FitDay.hourHeight(viewport))
+    }
+
+    @Test
+    fun `a short range on a tall screen stops at the pinch ceiling`() {
+        assertThat(TimelineScale.FitHours(9, 11).hourHeight(2000.dp)).isEqualTo(MAX_PINCH_HOUR_HEIGHT)
+    }
+
+    @Test
+    fun `ranges are held to the day and the minimum span`() {
+        assertThat(TimelineHours.of(true, -3, 30)).isEqualTo(TimelineHours(true, 0, 24))
+        assertThat(TimelineHours.of(true, 23, 22)).isEqualTo(TimelineHours(true, 20, 22))
+        assertThat(TimelineHours.of(true, 5, 1)).isEqualTo(TimelineHours(true, 0, 2))
+    }
+
+    @Test
+    fun `the pickers only offer valid pairings`() {
+        assertThat(TimelineHours.startOptions(22)).isEqualTo((0..20).toList())
+        assertThat(TimelineHours.endOptions(7)).isEqualTo((9..24).toList())
+    }
+
+    @Test
+    fun `opening scrolls to the start hour once the layout is at the fitted height`() {
+        // 40px an hour over a 600px viewport: 960px of content, 360px of scroll.
+        assertThat(startHourScroll(maxValue = 360, viewportPx = 600, startHour = 7, hourPx = 40f))
+            .isEqualTo(280)
+    }
+
+    @Test
+    fun `a layout still at the previous scale is waited out`() {
+        // Still 56px an hour: 1344 - 600 = 744 of scroll.
+        assertThat(startHourScroll(maxValue = 744, viewportPx = 600, startHour = 7, hourPx = 40f))
+            .isNull()
+        // Not laid out at all yet.
+        assertThat(startHourScroll(maxValue = Int.MAX_VALUE, viewportPx = 0, startHour = 7, hourPx = 40f))
+            .isNull()
+    }
+
+    @Test
+    fun `the whole day needs no scroll`() {
+        assertThat(startHourScroll(maxValue = 0, viewportPx = 600, startHour = 0, hourPx = 25f))
+            .isEqualTo(0)
+    }
+
+    @Test
+    fun `a fitted range round-trips through storage`() {
+        val scale = TimelineScale.FitHours(6, 20)
+        assertThat(parseTimelineScale(scale.storageValue())).isEqualTo(scale)
+        assertThat(parseTimelineScale("hours:x-2")).isEqualTo(TimelineScale.Regular)
+    }
+
+    @Test
+    fun `opening with visible hours on replaces a pinched scale`() {
+        val persisted = mutableListOf<TimelineScale>()
+        val zoom = TimelineZoom(TimelineScale.custom(90.dp)) { persisted += it }
+        zoom.adoptHours(TimelineHours(true, 7, 22))
+
+        assertThat(zoom.open()).isEqualTo(7)
+        assertThat(zoom.scale).isEqualTo(TimelineScale.FitHours(7, 22))
+
+        // A pinch overrides it for the visit but is not saved over the preference.
+        zoom.beginPinch()
+        zoom.pinchTo(100.dp)
+        zoom.endPinch()
+        assertThat(zoom.scale).isEqualTo(TimelineScale.custom(100.dp))
+        assertThat(persisted).isEmpty()
+
+        // Opening again fits the range again.
+        zoom.open()
+        assertThat(zoom.scale).isEqualTo(TimelineScale.FitHours(7, 22))
+    }
+
+    @Test
+    fun `a late stored scale does not undo the fit, and switching off restores it`() {
+        val zoom = TimelineZoom(TimelineScale.Regular) {}
+        zoom.adoptHours(TimelineHours(true, 7, 22))
+        zoom.open()
+        zoom.adopt(TimelineScale.Comfortable)
+        assertThat(zoom.scale).isEqualTo(TimelineScale.FitHours(7, 22))
+
+        zoom.adoptHours(TimelineHours(false, 7, 22))
+        assertThat(zoom.open()).isNull()
+        assertThat(zoom.scale).isEqualTo(TimelineScale.Comfortable)
+    }
+
+    @Test
+    fun `with visible hours off a pinch is still saved`() {
+        val persisted = mutableListOf<TimelineScale>()
+        val zoom = TimelineZoom(TimelineScale.Regular) { persisted += it }
+        assertThat(zoom.open()).isNull()
+        zoom.beginPinch()
+        zoom.pinchTo(70.dp)
+        zoom.endPinch()
+        assertThat(persisted).containsExactly(TimelineScale.custom(70.dp))
+    }
+}

app/src/test/java/de/jeanlucmakiola/calendula/ui/common/ViewBackStackTest.kt

@@ -65,6 +65,14 @@ class ViewBackStackTest {
         assertThat(stack.drillToDay()).isEqualTo(stack)
     }
 
+    @Test
+    fun `week number drills into week and back returns to month`() {
+        val stack = listOf(CalendarView.Month).drillToWeek()
+        assertThat(stack).containsExactly(CalendarView.Month, CalendarView.Week).inOrder()
+        assertThat(stack.dropLast(1).last()).isEqualTo(CalendarView.Month)
+        assertThat(stack.drillToWeek()).isEqualTo(stack)
+    }
+
     @Test
     fun `agenda widget date tap backs out agenda then home`() {
         // openDate(source = Agenda): root in Agenda over the Week home, then drill.

app/src/test/java/de/jeanlucmakiola/calendula/ui/common/ViewMorphKeyTest.kt

@@ -0,0 +1,50 @@
+package de.jeanlucmakiola.calendula.ui.common
+
+import com.google.common.truth.Truth.assertThat
+import de.jeanlucmakiola.calendula.domain.EventInstance
+import kotlinx.datetime.LocalDate
+import org.junit.jupiter.api.Test
+import kotlin.time.Instant
+
+class ViewMorphKeyTest {
+
+    private fun instance(instanceId: Long, eventId: Long = 7, startMillis: Long = 1_000L) = EventInstance(
+        instanceId = instanceId,
+        eventId = eventId,
+        calendarId = 1,
+        title = "Standup",
+        start = Instant.fromEpochMilliseconds(startMillis),
+        end = Instant.fromEpochMilliseconds(startMillis + 3_600_000L),
+        isAllDay = false,
+        color = 0,
+        location = null,
+    )
+
+    private val day = LocalDate(2026, 9, 25)
+
+    @Test
+    fun `the same occurrence on the same day matches across views`() {
+        // Each view reads its own instances query, so the row id is no anchor.
+        assertThat(ViewMorphKey.event(instance(instanceId = 1), day))
+            .isEqualTo(ViewMorphKey.event(instance(instanceId = 99), day))
+    }
+
+    @Test
+    fun `a multi-day event keys each day it is drawn from apart`() {
+        assertThat(ViewMorphKey.event(instance(1), day))
+            .isNotEqualTo(ViewMorphKey.event(instance(1), LocalDate(2026, 9, 26)))
+    }
+
+    @Test
+    fun `two occurrences of one series stay apart`() {
+        assertThat(ViewMorphKey.event(instance(1, startMillis = 1_000L), day))
+            .isNotEqualTo(ViewMorphKey.event(instance(2, startMillis = 2_000L), day))
+    }
+
+    @Test
+    fun `only the settled page morphs`() {
+        assertThat(morphPageActive(page = 5, settledPage = 5)).isTrue()
+        assertThat(morphPageActive(page = 4, settledPage = 5)).isFalse()
+        assertThat(morphPageActive(page = 6, settledPage = 5)).isFalse()
+    }
+}

app/src/test/java/de/jeanlucmakiola/calendula/ui/common/ViewScreenTest.kt

@@ -0,0 +1,20 @@
+package de.jeanlucmakiola.calendula.ui.common
+
+import com.google.common.truth.Truth.assertThat
+import org.junit.jupiter.api.Test
+
+/** Which screen draws each view: the timeline views share one, so switching among them resizes it (#184). */
+class ViewScreenTest {
+
+    @Test
+    fun `the day, multi-day and week views share the timeline`() {
+        assertThat(listOf(CalendarView.Day, CalendarView.MultiDay, CalendarView.Week).map { it.screen }.toSet())
+            .containsExactly(ViewScreen.Timeline)
+    }
+
+    @Test
+    fun `month and agenda each have their own screen`() {
+        assertThat(CalendarView.Month.screen).isEqualTo(ViewScreen.Month)
+        assertThat(CalendarView.Agenda.screen).isEqualTo(ViewScreen.Agenda)
+    }
+}

app/src/test/java/de/jeanlucmakiola/calendula/ui/day/DayPagingTest.kt

@@ -0,0 +1,22 @@
+package de.jeanlucmakiola.calendula.ui.day
+
+import com.google.common.truth.Truth.assertThat
+import kotlinx.datetime.LocalDate
+import org.junit.jupiter.api.Test
+
+class DayPagingTest {
+
+    @Test
+    fun `a page and its day round-trip`() {
+        listOf(LocalDate(2026, 9, 27), LocalDate(1990, 5, 16), LocalDate(2100, 2, 28)).forEach { day ->
+            assertThat(dayForPage(dayPageFor(day))).isEqualTo(day)
+        }
+    }
+
+    @Test
+    fun `adjacent pages are adjacent days across a month end`() {
+        val page = dayPageFor(LocalDate(2026, 2, 28))
+        assertThat(dayForPage(page + 1)).isEqualTo(LocalDate(2026, 3, 1))
+        assertThat(dayForPage(page - 1)).isEqualTo(LocalDate(2026, 2, 27))
+    }
+}

app/src/test/java/de/jeanlucmakiola/calendula/ui/month/ContinuousMonthIndexTest.kt

@@ -222,17 +222,17 @@ class ContinuousMonthIndexTest {
     }
 
     @Test
-    fun `the split selection follows the month, landing on today when it's there`() {
+    fun `the split agenda starts at today in the current month`() {
         val today = LocalDate(2026, 6, 10)
-        assertThat(selectionForMonth(jun26, today)).isEqualTo(today)
+        assertThat(agendaStartForMonth(jun26, today)).isEqualTo(today)
     }
 
     @Test
-    fun `the split selection falls to the 1st of any other month`() {
+    fun `the split agenda starts at the 1st of another month`() {
         val today = LocalDate(2026, 6, 10)
-        assertThat(selectionForMonth(YearMonth(2026, Month.JULY), today))
+        assertThat(agendaStartForMonth(YearMonth(2026, Month.JULY), today))
             .isEqualTo(LocalDate(2026, 7, 1))
-        assertThat(selectionForMonth(YearMonth(2025, Month.JUNE), today))
+        assertThat(agendaStartForMonth(YearMonth(2025, Month.JUNE), today))
             .isEqualTo(LocalDate(2025, 6, 1))
     }
 }

app/src/test/java/de/jeanlucmakiola/calendula/ui/month/MonthLayoutTest.kt

@@ -163,6 +163,18 @@ class MonthLayoutTest {
         assertThat(week.spans.map { it.lane }).containsExactly(0, 1)
     }
 
+    @Test
+    fun `multi-day bar is above a one-day all-day bar on the same date`() {
+        val day = LocalDate(2026, 6, 10)
+        val single = allDay(day, id = 1L, title = "Single")
+        val multi = allDay(day, day.plus(2, DateTimeUnit.DAY), id = 2L, title = "Multi")
+        val week = layoutCalendarWeek(weekOf8th, listOf(single, multi), zone)
+        val lanes = week.spans.associate { it.event.title to it.lane }
+        assertThat(lanes.getValue("Multi")).isLessThan(lanes.getValue("Single"))
+        assertThat(instancesByDay(listOf(day), listOf(single, multi), zone).getValue(day).map { it.title })
+            .containsExactly("Multi", "Single").inOrder()
+    }
+
     @Test
     fun `single-day timed events stay pills and sort by start`() {
         val late = timed(LocalDate(2026, 6, 10), 14, 15, id = 1L)

app/src/test/java/de/jeanlucmakiola/calendula/ui/week/ColumnGeometryTest.kt

@@ -0,0 +1,107 @@
+package de.jeanlucmakiola.calendula.ui.week
+
+import com.google.common.truth.Truth.assertThat
+import de.jeanlucmakiola.calendula.domain.EventInstance
+import kotlinx.datetime.DateTimeUnit
+import kotlinx.datetime.LocalDate
+import kotlinx.datetime.plus
+import kotlin.time.Instant
+import org.junit.jupiter.api.Test
+
+/** The timeline's columns, standing still and mid view switch (#184). */
+class ColumnGeometryTest {
+
+    // 2026-09-27 is a Sunday; the week runs Sun..Sat.
+    private val sunday = LocalDate(2026, 9, 27)
+    private val week = DaySpan(sunday, 7)
+    private val monday = sunday.plus(1, DateTimeUnit.DAY)
+    private val day = DaySpan(monday, 1)
+    private val width = 700f
+    private val gap = 7f
+
+    @Test
+    fun `a page's columns follow the pitch`() {
+        val slot = week.slot(sunday.plus(3, DateTimeUnit.DAY), width, gap)
+        assertThat(slot.left).isEqualTo(3 * 101f)
+        assertThat(slot.width).isEqualTo(94f)
+    }
+
+    @Test
+    fun `the ends of a switch are the two pages`() {
+        var p = 0f
+        val geometry = ColumnGeometry(week, day) { p }
+        assertThat(geometry.slot(monday, width, gap)).isEqualTo(week.slot(monday, width, gap))
+        p = 1f
+        assertThat(geometry.slot(monday, width, gap)).isEqualTo(day.slot(monday, width, gap))
+    }
+
+    @Test
+    fun `days off the target page end off screen on their side`() {
+        val geometry = ColumnGeometry(week, day) { 1f }
+        assertThat(geometry.slot(sunday, width, gap).right).isAtMost(0f)
+        assertThat(geometry.slot(monday.plus(1, DateTimeUnit.DAY), width, gap).left).isAtLeast(width)
+    }
+
+    @Test
+    fun `a switch covers both pages without a break`() {
+        // Focus on Saturday: the six-day run starting there reaches into next week.
+        val saturday = sunday.plus(6, DateTimeUnit.DAY)
+        val geometry = ColumnGeometry(week, DaySpan(saturday, 6)) { 0f }
+        assertThat(geometry.dates).hasSize(12)
+        assertThat(geometry.dates.first()).isEqualTo(sunday)
+        assertThat(geometry.dates.zipWithNext().all { (a, b) -> b == a.plus(1, DateTimeUnit.DAY) }).isTrue()
+    }
+
+    @Test
+    fun `a bar spans its extent on each page`() {
+        val tuesday = monday.plus(1, DateTimeUnit.DAY)
+        val range = monday..tuesday
+        val geometry = ColumnGeometry(week, day) { 0f }
+        val extent = geometry.extent(range, monday..monday, width, 0f)
+        assertThat(extent.left).isEqualTo(week.slot(monday, width, 0f).left)
+        assertThat(extent.right).isEqualTo(week.slot(tuesday, width, 0f).right)
+    }
+
+    @Test
+    fun `a bar only one page has keeps its days on the other`() {
+        val bar = AllDaySpan(event(1), startCol = 2, endCol = 3, lane = 1)
+        val from = state(week, listOf(bar))
+        val to = state(day, emptyList())
+        val placed = morphBars(from, to).single()
+        assertThat(placed.fromRange).isEqualTo(placed.toRange)
+        assertThat(placed.toLane).isEqualTo(1)
+    }
+
+    @Test
+    fun `a bar on both pages is placed once, clipped to each`() {
+        val event = event(1)
+        val from = state(week, listOf(AllDaySpan(event, startCol = 0, endCol = 6, lane = 0)))
+        val to = state(day, listOf(AllDaySpan(event, startCol = 0, endCol = 0, lane = 0)))
+        val placed = morphBars(from, to).single()
+        assertThat(placed.fromRange).isEqualTo(sunday..sunday.plus(6, DateTimeUnit.DAY))
+        assertThat(placed.toRange).isEqualTo(monday..monday)
+    }
+
+    private fun state(span: DaySpan, bars: List<AllDaySpan>): WeekUiState.Success {
+        val days = (0 until span.count).map { span.start.plus(it, DateTimeUnit.DAY) }
+        return WeekUiState.Success(
+            weekStart = span.start,
+            today = sunday,
+            days = days,
+            allDaySpans = bars,
+            timedByDay = emptyMap(),
+        )
+    }
+
+    private fun event(id: Long) = EventInstance(
+        instanceId = id,
+        eventId = id,
+        calendarId = 1L,
+        title = "Event",
+        start = Instant.fromEpochMilliseconds(0),
+        end = Instant.fromEpochMilliseconds(0),
+        isAllDay = true,
+        color = 0xFF000000.toInt(),
+        location = null,
+    )
+}

app/src/test/java/de/jeanlucmakiola/calendula/ui/week/FocusOnPageTest.kt

@@ -0,0 +1,40 @@
+package de.jeanlucmakiola.calendula.ui.week
+
+import com.google.common.truth.Truth.assertThat
+import kotlinx.datetime.DayOfWeek
+import kotlinx.datetime.LocalDate
+import org.junit.jupiter.api.Test
+
+/** Where the focused date goes as a timeline pages (#184). */
+class FocusOnPageTest {
+
+    // 2026-09-30 is a Wednesday.
+    private val wednesday = LocalDate(2026, 9, 30)
+
+    @Test
+    fun `a page that still shows the focus keeps it`() {
+        val grid = WeekGrid(DayOfWeek.MONDAY)
+        assertThat(grid.focusOnPage(wednesday, grid.pageFor(wednesday))).isEqualTo(wednesday)
+    }
+
+    @Test
+    fun `a week on keeps the weekday`() {
+        val grid = WeekGrid(DayOfWeek.MONDAY)
+        val page = grid.pageFor(wednesday)
+        assertThat(grid.focusOnPage(wednesday, page + 1)).isEqualTo(LocalDate(2026, 10, 7))
+        assertThat(grid.focusOnPage(wednesday, page - 2)).isEqualTo(LocalDate(2026, 9, 16))
+    }
+
+    @Test
+    fun `a run of days keeps the focus's column`() {
+        val grid = DaysGrid.startingAt(LocalDate(2026, 9, 29), 3)
+        val page = grid.pageFor(wednesday)
+        assertThat(grid.focusOnPage(wednesday, page + 1)).isEqualTo(LocalDate(2026, 10, 3))
+    }
+
+    @Test
+    fun `a day page is the focus`() {
+        val page = DayGrid.pageFor(wednesday)
+        assertThat(DayGrid.focusOnPage(wednesday, page + 5)).isEqualTo(LocalDate(2026, 10, 5))
+    }
+}

app/src/test/java/de/jeanlucmakiola/calendula/ui/week/WeekLayoutTest.kt

@@ -49,8 +49,8 @@ class WeekLayoutTest {
     }
 
     @Test
-    fun `weekRange spans seven days`() {
+    fun `spanRange spans seven days`() {
-        val range = weekRange(mon, zone)
+        val range = spanRange(mon, 7, zone)
         assertThat(range.start).isEqualTo(at(mon, 0, 0))
         // endInclusive is the last second of day 7 (Sunday 2026-06-14)
         assertThat(range.endInclusive).isEqualTo(LocalDate(2026, 6, 14).atTime(23, 59, 59).toInstant(zone))

app/src/test/java/de/jeanlucmakiola/calendula/ui/week/WeekPagingTest.kt

@@ -0,0 +1,81 @@
+package de.jeanlucmakiola.calendula.ui.week
+
+import com.google.common.truth.Truth.assertThat
+import kotlinx.datetime.DateTimeUnit
+import kotlinx.datetime.DayOfWeek
+import kotlinx.datetime.LocalDate
+import kotlinx.datetime.plus
+import org.junit.jupiter.api.Test
+
+class WeekPagingTest {
+
+    // 2026-09-27 is a Sunday.
+    private val sunday = LocalDate(2026, 9, 27)
+
+    @Test
+    fun `a page and its week round-trip for every first day`() {
+        DayOfWeek.entries.forEach { firstDay ->
+            val page = weekPageFor(sunday, firstDay)
+            val start = weekStartForPage(page, firstDay)
+            assertThat(start).isEqualTo(sunday.startOfWeek(firstDay))
+            assertThat(weekPageFor(start, firstDay)).isEqualTo(page)
+        }
+    }
+
+    @Test
+    fun `every day of a week maps to the same page`() {
+        val start = sunday.startOfWeek(DayOfWeek.MONDAY)
+        val pages = (0..6).map { weekPageFor(start.plus(it, DateTimeUnit.DAY), DayOfWeek.MONDAY) }
+        assertThat(pages.toSet()).hasSize(1)
+    }
+
+    @Test
+    fun `adjacent pages are adjacent weeks`() {
+        val page = weekPageFor(sunday, DayOfWeek.SUNDAY)
+        assertThat(weekStartForPage(page + 1, DayOfWeek.SUNDAY))
+            .isEqualTo(LocalDate(2026, 10, 4))
+        assertThat(weekStartForPage(page - 1, DayOfWeek.SUNDAY))
+            .isEqualTo(LocalDate(2026, 9, 20))
+    }
+
+    @Test
+    fun `dates before the epoch page resolve too`() {
+        val old = LocalDate(1990, 5, 16)
+        val page = weekPageFor(old, DayOfWeek.MONDAY)
+        assertThat(weekStartForPage(page, DayOfWeek.MONDAY)).isEqualTo(LocalDate(1990, 5, 14))
+    }
+
+    @Test
+    fun `multi-day pages begin on the selected date and advance by the chosen count`() {
+        (3..6).forEach { count ->
+            val grid = DaysGrid.startingAt(sunday, count)
+            val page = grid.pageFor(sunday)
+            assertThat(grid.startForPage(page)).isEqualTo(sunday)
+            assertThat(grid.startForPage(page + 1)).isEqualTo(sunday.plus(count, DateTimeUnit.DAY))
+            assertThat(grid.pageFor(sunday.plus(count - 1, DateTimeUnit.DAY))).isEqualTo(page)
+        }
+    }
+
+    @Test
+    fun `multi-day pages also work before the epoch`() {
+        val date = LocalDate(1990, 5, 16)
+        val grid = DaysGrid.startingAt(date, 3)
+        val page = grid.pageFor(date)
+        assertThat(grid.startForPage(page)).isEqualTo(date)
+        assertThat(grid.startForPage(page - 1)).isEqualTo(LocalDate(1990, 5, 13))
+    }
+
+    @Test
+    fun `a day page and its day round-trip`() {
+        listOf(LocalDate(2026, 9, 27), LocalDate(1990, 5, 16), LocalDate(2100, 2, 28)).forEach { day ->
+            assertThat(DayGrid.startForPage(DayGrid.pageFor(day))).isEqualTo(day)
+        }
+    }
+
+    @Test
+    fun `adjacent day pages are adjacent days across a month end`() {
+        val page = DayGrid.pageFor(LocalDate(2026, 2, 28))
+        assertThat(DayGrid.startForPage(page + 1)).isEqualTo(LocalDate(2026, 3, 1))
+        assertThat(DayGrid.startForPage(page - 1)).isEqualTo(LocalDate(2026, 2, 27))
+    }
+}

docs/ARCHITECTURE.md

@@ -27,7 +27,7 @@ the package list (recurring writes, save conflicts, reminder delivery).
 ```mermaid
 flowchart TD
     subgraph UI ["ui/ — Compose screens + ViewModels"]
-        Screens["Month / Week / Day\nDetail / Edit / Settings\nOnboarding wizard"]
+        Screens["Month / Timeline / Agenda\nDetail / Edit / Settings\nOnboarding wizard"]
     end
     subgraph Data ["data/"]
         Repo["CalendarRepository\n(interface + impl, Flow-based, io-dispatched)"]
@@ -79,10 +79,42 @@ flowchart TD
 
 There is no navigation library. `MainActivity` hosts `RootScreen`, which
 gates on the first-launch wizard (`ui/onboarding/`), then shows
-`CalendarHost`. `CalendarHost` holds the active view (month/week/day)
+`CalendarHost`. `CalendarHost` holds the active view (month, day/multi-day/week,
-plus overlay state for detail, edit, and settings — full-screen overlays
+agenda) plus overlay state for detail, edit, and settings — full-screen overlays
 driven by `AnimatedVisibility` with a *held-key* pattern: the last shown
 key stays alive through the slide-out so content never flashes empty.
+Overlays leave through floret-kit's `predictiveBackExit`, so a committed back
+gesture finishes from its scaled preview.
+
+### Switching views (#184)
+
+- **One focused date.** `CalendarHost` owns a `ViewFocus` (`LocalViewFocus`)
+  that every view opens on and carries along. A view *reads* it once, on
+  entry, synchronously (`EnterOnFocus` before it reads its own position, so
+  its first frame is already on that date), and *writes* it only when the user
+  moves — a pager settling (`focusOnPage` keeps the date's place in the page),
+  a jump, Today, a tapped day, the agenda's top row. Writing on entry would
+  drift the date on every round trip.
+- **Three screens, not five.** The host's `AnimatedContent` is keyed on
+  `ViewScreen` (month, timeline, agenda), not on the view: day, multi-day and
+  week are one `TimelineScreen` with a `TimelineKind` each and a view model
+  each. Keying the three on one `contentKey` instead would still replay the
+  enter transition on every switch among them.
+- **Timeline ↔ timeline resizes in place.** `ColumnGeometry` places every
+  column (header cell, all-day bar, day column) in the layout pass; a switch
+  swaps the pager for a frame over both pages' days, each column lerped
+  between its slot on the one page and the other — a day the page doesn't
+  show carries on at its pitch, off screen, which is what slides it in or
+  out. Blocks sit in their column as shares of its width (`LaneColumn`), so
+  nothing recomposes per frame. The frame starts and ends exactly as the two
+  pages lay out, so the pagers either side hand over without a jump.
+- **Across screens, what both show morphs.** Inside a `SharedTransitionLayout`,
+  an event shown in both views travels from its old bounds to its new ones,
+  keyed per occurrence *and* per day it is drawn from (`ViewMorphKey`); only a
+  pager's settled page carries the tags. The drawer, top bar and FAB are not
+  per screen: CalendarHost draws them once, above the switch, from what the
+  screen on show publishes (`PublishChrome` in `CalendarChrome.kt`), so a
+  switch only changes what they say.
 A tapped reminder notification routes through `MainActivity` (`singleTop` +
 `onNewIntent`) as an external detail key that `CalendarHost` consumes
 exactly like an event tap.

gradle/libs.versions.toml

@@ -1,5 +1,5 @@
 [versions]
-agp = "9.4.0"
+agp = "9.2.1"
 kotlin = "2.3.21"
 ksp = "2.3.11"
 hilt = "2.60.1"