fix(#270): review round 3 - one write per editor save, best-effort pref tidy-up

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

@@ -165,6 +165,7 @@ class SettingsPrefs @Inject constructor(
     val autofocusEventTitle: Flow<Boolean> = prefs.flow(SettingsKeys.autofocusEventTitle)
     val defaultEventDurationMinutes: Flow<Int> = prefs.flow(SettingsKeys.defaultEventDurationMinutes)
     val perCalendarEventDuration: Flow<Map<Long, Int>> = prefs.flow(SettingsKeys.perCalendarEventDuration)
+    val perCalendarHiddenViews: Flow<Map<Long, Set<CalendarView>>> = prefs.flow(SettingsKeys.perCalendarHiddenViews)
     val remindersEnabled: Flow<Boolean> = prefs.flow(SettingsKeys.remindersEnabled)
     val allowColorOnUnsupportedCalendars: Flow<Boolean> =
         prefs.flow(SettingsKeys.allowColorOnUnsupportedCalendars)
@@ -271,6 +272,25 @@ class SettingsPrefs @Inject constructor(
         }
     }
 
+    /** Hide [calendarId] in [views] only (#270); an empty set shows it everywhere again. */
+    suspend fun setCalendarHiddenViews(calendarId: Long, views: Set<CalendarView>) {
+        prefs.update(SettingsKeys.perCalendarHiddenViews) { current -> current.withHiddenViews(calendarId, views) }
+    }
+
+    /** Hide or show [calendarId] in one [view], against the stored set rather than a snapshot of it. */
+    suspend fun setCalendarHiddenIn(calendarId: Long, view: CalendarView, hidden: Boolean) =
+        applyCalendarHiddenChanges(calendarId, mapOf(view to hidden))
+
+    /** Hide (true) or show (false) [calendarId] in each view of [changes], in one write; other views keep theirs. */
+    suspend fun applyCalendarHiddenChanges(calendarId: Long, changes: Map<CalendarView, Boolean>) {
+        if (changes.isEmpty()) return
+        prefs.update(SettingsKeys.perCalendarHiddenViews) { current ->
+            val views = current[calendarId].orEmpty()
+            val next = views + changes.filterValues { it }.keys - changes.filterValues { !it }.keys
+            current.withHiddenViews(calendarId, next)
+        }
+    }
+
     suspend fun setRemindersEnabled(enabled: Boolean) = prefs.set(SettingsKeys.remindersEnabled, enabled)
 
     suspend fun setAllowColorOnUnsupportedCalendars(enabled: Boolean) =
@@ -588,6 +608,15 @@ object SettingsKeys {
     val perCalendarEventDuration: Pref<Map<Long, Int>> =
         nullableStringPref("per_calendar_event_duration").map(::parseDurationOverrides) { it.toStoredDurations() }
 
+    /**
+     * Views each calendar is hidden in (#270): a display-only filter on top of
+     * `Calendars.VISIBLE` and the drawer's filter, so reminders and search never
+     * see it. A calendar absent shows in every view. Serialised as
+     * `id=Month,Agenda;id=Week`.
+     */
+    val perCalendarHiddenViews: Pref<Map<Long, Set<CalendarView>>> =
+        nullableStringPref("per_calendar_hidden_views").map(::parseHiddenViews) { it.toStoredHiddenViews() }
+
     /**
      * Whether Calendula posts reminder notifications (v1.4). On by default — for
      * users whose only calendar app this is, reminders are essential.
@@ -817,9 +846,11 @@ private fun parseFormFields(stored: String?): Set<EventFormField> = when (stored
 private fun parseViewOrder(stored: String?): List<CalendarView> =
     completeViewOrder(
         stored?.split(',').orEmpty()
-            .mapNotNull { name -> CalendarView.entries.firstOrNull { it.name == name.trim() } },
+            .mapNotNull { it.trim().toCalendarViewOrNull() },
     )
 
+private fun String.toCalendarViewOrNull(): CalendarView? = CalendarView.entries.firstOrNull { it.name == this }
+
 /** Parse the quick-switch config; "!"-prefixed names are disabled. */
 private fun parseQuickSwitch(stored: String?): QuickSwitchConfig {
     if (stored == null) return QuickSwitchConfig.Default
@@ -827,7 +858,7 @@ private fun parseQuickSwitch(stored: String?): QuickSwitchConfig {
         val token = raw.trim()
         val disabled = token.startsWith("!")
         val name = if (disabled) token.drop(1) else token
-        CalendarView.entries.firstOrNull { it.name == name }?.let { it to disabled }
+        name.toCalendarViewOrNull()?.let { it to disabled }
     }
     val order = completeViewOrder(parsed.map { it.first })
     // Only views explicitly stored disabled are excluded; anything appended
@@ -977,6 +1008,33 @@ private fun parseDurationOverrides(stored: String?): Map<Long, Int> =
         calendarId to minutes
     }.toMap()
 
+/**
+ * Parse the per-calendar hidden-views map (`id=View,View` entries joined by `;`).
+ * Unknown view names and malformed entries are dropped; an entry left with no
+ * views is dropped with them.
+ */
+internal fun parseHiddenViews(stored: String?): Map<Long, Set<CalendarView>> =
+    stored?.split(ENTRY_SEP).orEmpty().mapNotNull { entry ->
+        val parts = entry.split(KEY_VALUE_SEP)
+        if (parts.size != 2) return@mapNotNull null
+        val calendarId = parts[0].trim().toLongOrNull() ?: return@mapNotNull null
+        val views = parts[1].split(LIST_SEP)
+            .mapNotNullTo(mutableSetOf()) { it.trim().toCalendarViewOrNull() }
+        if (views.isEmpty()) null else calendarId to views
+    }.toMap()
+
+private fun Map<Long, Set<CalendarView>>.withHiddenViews(
+    calendarId: Long,
+    views: Set<CalendarView>,
+): Map<Long, Set<CalendarView>> = if (views.isEmpty()) this - calendarId else this + (calendarId to views)
+
+internal fun Map<Long, Set<CalendarView>>.toStoredHiddenViews(): String? =
+    entries.filter { it.value.isNotEmpty() }.sortedBy { it.key }
+        .joinToString(ENTRY_SEP) { (id, views) ->
+            "$id$KEY_VALUE_SEP" + views.sortedBy { it.ordinal }.joinToString(LIST_SEP) { it.name }
+        }
+        .ifEmpty { null }
+
 private fun Map<Long, Int>.toStoredDurations(): String =
     entries.sortedBy { it.key }.joinToString(ENTRY_SEP) { (id, minutes) ->
         "$id$KEY_VALUE_SEP$minutes"

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

@@ -309,3 +309,7 @@ enum class FailureReason {
     EventNotFound,
     Unknown,
 }
+
+/** [this] without the events of [hidden] calendars. */
+fun List<EventInstance>.withoutCalendars(hidden: Set<Long>): List<EventInstance> =
+    if (hidden.isEmpty()) this else filterNot { it.calendarId in hidden }

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

@@ -15,6 +15,9 @@ 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.CalendarView
+import de.jeanlucmakiola.calendula.ui.common.calendarsHiddenIn
+import de.jeanlucmakiola.calendula.ui.common.instancesWithout
 import de.jeanlucmakiola.floret.android.stateWhileSubscribed
 import de.jeanlucmakiola.floret.di.IoDispatcher
 import kotlinx.coroutines.CoroutineDispatcher
@@ -46,6 +49,8 @@ class AgendaViewModel @Inject constructor(
     @IoDispatcher private val io: CoroutineDispatcher,
 ) : ViewModel() {
 
+    private val hiddenHere = settingsPrefs.perCalendarHiddenViews.calendarsHiddenIn(CalendarView.Agenda, viewModelScope)
+
     // The saved agenda range plus the range-bar visibility toggle.
     private val agendaSettings = combine(
         settingsPrefs.agendaScreenRange,
@@ -138,7 +143,7 @@ class AgendaViewModel @Inject constructor(
             )
             combine(
                 repository.calendars(),
-                repository.instances(window),
+                repository.instancesWithout(window, hiddenHere),
                 today,
             ) { calendars, instances, today ->
                 buildState(params, calendars, instances, today)

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

@@ -3,6 +3,7 @@ package de.jeanlucmakiola.calendula.ui.calendars
 import android.accounts.AccountManager
 import android.content.Context
 import android.content.Intent
+import android.icu.text.ListFormatter
 import android.provider.Settings
 import androidx.compose.animation.AnimatedVisibility
 import androidx.compose.foundation.background
@@ -54,6 +55,7 @@ import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.alpha
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.graphics.vector.ImageVector
+import androidx.compose.ui.platform.LocalConfiguration
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.semantics.contentDescription
@@ -72,6 +74,11 @@ import de.jeanlucmakiola.calendula.domain.stateLabels
 import de.jeanlucmakiola.calendula.data.calendar.CalendarColorPalette
 import de.jeanlucmakiola.calendula.ui.common.AccountKey
 import de.jeanlucmakiola.calendula.ui.common.CalendarColorChip
+import de.jeanlucmakiola.calendula.ui.common.CalendarView
+import de.jeanlucmakiola.calendula.ui.common.IMPLEMENTED_VIEWS
+import de.jeanlucmakiola.calendula.ui.common.icon
+import de.jeanlucmakiola.calendula.ui.common.label
+import de.jeanlucmakiola.floret.components.MultiOptionPicker
 import de.jeanlucmakiola.calendula.ui.common.CalendarVisibilitySwitch
 import de.jeanlucmakiola.calendula.ui.common.accountGroupTitle
 import de.jeanlucmakiola.calendula.ui.common.groupByAccount
@@ -130,12 +137,15 @@ fun CalendarsScreen(
     val calendars by viewModel.calendars.collectAsStateWithLifecycle()
     val deleteLockedIds by viewModel.deleteLockedCalendarIds.collectAsStateWithLifecycle()
     val error by viewModel.error.collectAsStateWithLifecycle()
+    val hiddenViews by viewModel.hiddenViews.collectAsStateWithLifecycle()
 
     // null = list; NEW_CALENDAR_ID = create; any other id = edit that calendar.
     // [editorSession] bumps on every open so the editor's field state resets for
     // a fresh open while still surviving configuration changes within one open.
     var editorId by rememberSaveable { mutableStateOf<Long?>(null) }
     var editorSession by rememberSaveable { mutableStateOf(0) }
+    // A synced calendar has no editor; tapping it opens its hidden-views picker.
+    var hidingId by rememberSaveable { mutableStateOf<Long?>(null) }
 
     if (editorId != null) {
         val editing = calendars.firstOrNull { it.id == editorId }
@@ -145,13 +155,15 @@ fun CalendarsScreen(
             initialName = editing?.displayName.orEmpty(),
             initialColor = editing?.color ?: CalendarColorPalette.all.first(),
             initialDescription = editing?.description.orEmpty(),
+            showHiddenViews = true,
+            initialHiddenViews = editing?.let { hiddenViews[it.id] }.orEmpty(),
             deleteLocked = editing != null && editing.id in deleteLockedIds,
-            onSave = { name, color, description ->
+            onSave = { name, color, description, views ->
                 val id = editorId
                 if (id == null || id == NEW_CALENDAR_ID) {
-                    viewModel.createCalendar(name, color, description)
+                    viewModel.createCalendar(name, color, description, views)
                 } else {
-                    viewModel.updateCalendar(id, name, color, description)
+                    viewModel.updateCalendar(id, name, color, description, views)
                 }
                 editorId = null
             },
@@ -165,6 +177,7 @@ fun CalendarsScreen(
         CalendarsList(
             local = calendars.filter { it.isLocal },
             synced = calendars.filterNot { it.isLocal },
+            hiddenViews = hiddenViews,
             error = error,
             onConsumeError = viewModel::consumeError,
             onOpenBackup = onOpenBackup,
@@ -172,9 +185,24 @@ fun CalendarsScreen(
             visible = visible,
             onAdd = { editorSession++; editorId = NEW_CALENDAR_ID },
             onEdit = { calendar -> editorSession++; editorId = calendar.id },
+            onEditHiddenViews = { calendar -> hidingId = calendar.id },
             onSetVisible = viewModel::setCalendarVisible,
             onSetAccountVisible = viewModel::setAccountVisible,
         )
+        hidingId?.let { id ->
+            val calendar = calendars.firstOrNull { it.id == id }
+            // Gone while the picker was up; an empty list is one still loading, not a deletion.
+            if (calendar == null && calendars.isNotEmpty()) {
+                LaunchedEffect(id) { hidingId = null }
+            } else if (calendar != null) {
+                HiddenViewsPicker(
+                    calendarName = calendar.displayName.orUnnamed(),
+                    hidden = hiddenViews[id].orEmpty(),
+                    onToggle = { view, hide -> viewModel.setHiddenIn(id, view, hide) },
+                    onDismiss = { hidingId = null },
+                )
+            }
+        }
     }
 }
 
@@ -182,6 +210,7 @@ fun CalendarsScreen(
 private fun CalendarsList(
     local: List<CalendarSource>,
     synced: List<CalendarSource>,
+    hiddenViews: Map<Long, Set<CalendarView>>,
     error: Boolean,
     onConsumeError: () -> Unit,
     onOpenBackup: () -> Unit,
@@ -189,6 +218,7 @@ private fun CalendarsList(
     visible: Boolean,
     onAdd: () -> Unit,
     onEdit: (CalendarSource) -> Unit,
+    onEditHiddenViews: (CalendarSource) -> Unit,
     onSetVisible: (Long, Boolean) -> Unit,
     onSetAccountVisible: (Collection<Long>, Boolean) -> Unit,
 ) {
@@ -241,6 +271,7 @@ private fun CalendarsList(
                 local.forEachIndexed { index, calendar ->
                     CalendarManagerRow(
                         calendar = calendar,
+                        hiddenViews = hiddenViews[calendar.id].orEmpty(),
                         last = index == local.lastIndex,
                         onSetVisible = onSetVisible,
                         onClick = { onEdit(calendar) },
@@ -315,8 +346,10 @@ private fun CalendarsList(
                     ordered.forEachIndexed { index, calendar ->
                         CalendarManagerRow(
                             calendar = calendar,
+                            hiddenViews = hiddenViews[calendar.id].orEmpty(),
                             last = index == ordered.lastIndex,
                             onSetVisible = onSetVisible,
+                            onClick = { onEditHiddenViews(calendar) },
                         )
                     }
                 }
@@ -339,19 +372,32 @@ internal fun CalendarEditor(
     initialName: String,
     initialColor: Int,
     initialDescription: String,
-    onSave: (name: String, color: Int, description: String?) -> Unit,
+    onSave: (name: String, color: Int, description: String?, hiddenChanges: Map<CalendarView, Boolean>) -> Unit,
     onDelete: () -> Unit,
     onClose: () -> Unit,
     deleteLocked: Boolean = false,
+    showHiddenViews: Boolean = false,
+    initialHiddenViews: Set<CalendarView> = emptySet(),
 ) {
     var name by rememberSaveable(sessionKey) { mutableStateOf(initialName) }
+    val seededHiddenViews = rememberSaveable(sessionKey) { initialHiddenViews }
+    var hiddenViews by rememberSaveable(sessionKey) { mutableStateOf(initialHiddenViews) }
+    var pickHiddenViews by rememberSaveable(sessionKey) { mutableStateOf(false) }
     var color by rememberSaveable(sessionKey) { mutableStateOf(initialColor) }
     var description by rememberSaveable(sessionKey) { mutableStateOf(initialDescription) }
     var confirmDelete by remember { mutableStateOf(false) }
     val focusRequester = remember { FocusRequester() }
 
     val valid = name.isNotBlank()
-    val commit = { if (valid) onSave(name.trim(), color, description.trim().ifEmpty { null }) }
+    val commit = {
+        if (valid) {
+            // Only the views toggled here are written, so a save never resets ones it didn't load.
+            val changes = IMPLEMENTED_VIEWS
+                .filter { (it in hiddenViews) != (it in seededHiddenViews) }
+                .associateWith { it in hiddenViews }
+            onSave(name.trim(), color, description.trim().ifEmpty { null }, changes)
+        }
+    }
 
     FullScreenPicker(
         title = stringResource(
@@ -403,6 +449,16 @@ internal fun CalendarEditor(
             }
         }
 
+        if (showHiddenViews) {
+            Spacer(Modifier.height(20.dp))
+            GroupedRow(
+                title = stringResource(R.string.calendars_hide_in_views),
+                summary = hiddenViewsSummary(hiddenViews),
+                position = Position.Alone,
+                onClick = { pickHiddenViews = true },
+            )
+        }
+
         if (!isNew && !deleteLocked) {
             Spacer(Modifier.height(24.dp))
             DeleteCalendarRow(onClick = { confirmDelete = true })
@@ -410,6 +466,17 @@ internal fun CalendarEditor(
         Spacer(Modifier.height(24.dp))
     }
 
+    if (pickHiddenViews) {
+        HiddenViewsPicker(
+            calendarName = name.trim().orUnnamed(),
+            hidden = hiddenViews,
+            onToggle = { view, hide ->
+                hiddenViews = if (hide) hiddenViews + view else hiddenViews - view
+            },
+            onDismiss = { pickHiddenViews = false },
+        )
+    }
+
     if (confirmDelete) {
         AlertDialog(
             onDismissRequest = { confirmDelete = false },
@@ -636,7 +703,7 @@ private fun EditorSectionLabel(text: String) {
  * plain writable one (#76), then its own description.
  */
 @Composable
-private fun calendarRowSummary(calendar: CalendarSource): String? {
+private fun calendarRowSummary(calendar: CalendarSource, hiddenViews: Set<CalendarView>): String? {
     val states = calendar.stateLabels().map { label ->
         stringResource(
             when (label) {
@@ -646,7 +713,8 @@ private fun calendarRowSummary(calendar: CalendarSource): String? {
             },
         )
     }
-    val parts = states + listOfNotNull(calendar.description?.takeIf { it.isNotBlank() })
+    val hidden = if (hiddenViews.isEmpty()) null else hiddenViewsSummary(hiddenViews)
+    val parts = states + listOfNotNull(hidden, calendar.description?.takeIf { it.isNotBlank() })
     return parts.joinToString(" · ").ifEmpty { null }
 }
 
@@ -662,6 +730,7 @@ private fun calendarRowSummary(calendar: CalendarSource): String? {
 @Composable
 private fun CalendarManagerRow(
     calendar: CalendarSource,
+    hiddenViews: Set<CalendarView>,
     last: Boolean,
     onSetVisible: (Long, Boolean) -> Unit,
     onClick: (() -> Unit)? = null,
@@ -669,7 +738,7 @@ private fun CalendarManagerRow(
     val disabled = !calendar.isVisibleInSystem || calendar.isNotSynced
     GroupedRow(
         title = calendar.displayName.orUnnamed(),
-        summary = calendarRowSummary(calendar),
+        summary = calendarRowSummary(calendar, hiddenViews),
         position = if (last) Position.Bottom else Position.Middle,
         container = MaterialTheme.colorScheme.surfaceContainerHighest,
         dimmed = disabled,
@@ -689,6 +758,51 @@ private fun CalendarManagerRow(
     )
 }
 
+/**
+ * Which views one calendar stays out of (#270); display only, so reminders and
+ * search keep the calendar. [onToggle] decides when a toggle lands: at once for
+ * a synced calendar, on Save inside the local editor.
+ */
+@Composable
+private fun HiddenViewsPicker(
+    calendarName: String,
+    hidden: Set<CalendarView>,
+    onToggle: (CalendarView, Boolean) -> Unit,
+    onDismiss: () -> Unit,
+) {
+    // Seeded once and then ahead of the store: the picker is the only writer while
+    // it is open, so following each write back would only flicker a quick second tap.
+    var shown by remember { mutableStateOf(hidden) }
+    MultiOptionPicker(
+        title = stringResource(R.string.calendars_hide_in_views),
+        options = IMPLEMENTED_VIEWS,
+        selected = shown,
+        label = { it.label() },
+        onToggle = { view, hide ->
+            shown = if (hide) shown + view else shown - view
+            onToggle(view, hide)
+        },
+        onDismiss = onDismiss,
+        leading = { Icon(it.icon, contentDescription = null) },
+        header = {
+            GroupedHint(
+                stringResource(R.string.calendars_hide_in_views_hint, calendarName),
+                verticalPadding = 8.dp,
+            )
+        },
+        predictiveBack = true,
+    )
+}
+
+/** "Shown in every view", or the views [hidden] names, in the app's view order. */
+@Composable
+private fun hiddenViewsSummary(hidden: Set<CalendarView>): String {
+    if (hidden.isEmpty()) return stringResource(R.string.calendars_hide_in_views_none)
+    val names = IMPLEMENTED_VIEWS.filter { it in hidden }.map { it.label() }
+    val locale = LocalConfiguration.current.locales[0]
+    return stringResource(R.string.calendars_hidden_in, ListFormatter.getInstance(locale).format(names))
+}
+
 /** Fade a leading element to the M3 disabled emphasis when [disabled]. */
 private fun dimIf(disabled: Boolean): Modifier =
     if (disabled) Modifier.alpha(0.38f) else Modifier

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

@@ -3,6 +3,7 @@ package de.jeanlucmakiola.calendula.ui.calendars
 import android.content.Context
 import android.content.Intent
 import android.net.Uri
+import android.util.Log
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
 import dagger.hilt.android.lifecycle.HiltViewModel
@@ -15,6 +16,7 @@ import de.jeanlucmakiola.calendula.data.prefs.SettingsPrefs
 import de.jeanlucmakiola.calendula.domain.CalendarSource
 import de.jeanlucmakiola.calendula.domain.FailureReason
 import de.jeanlucmakiola.calendula.domain.ics.IcsWriter
+import de.jeanlucmakiola.calendula.ui.common.CalendarView
 import de.jeanlucmakiola.floret.android.stateWhileSubscribed
 import de.jeanlucmakiola.floret.di.IoDispatcher
 import kotlinx.coroutines.CoroutineDispatcher
@@ -104,6 +106,19 @@ class CalendarsViewModel @Inject constructor(
             initialValue = emptySet(),
         )
 
+    /** The views each calendar is hidden in (#270). */
+    val hiddenViews: StateFlow<Map<Long, Set<CalendarView>>> =
+        settingsPrefs.perCalendarHiddenViews
+            .catch { emit(emptyMap()) }
+            .stateWhileSubscribed(
+                scope = viewModelScope,
+                initialValue = emptyMap(),
+            )
+
+    fun setHiddenIn(id: Long, view: CalendarView, hidden: Boolean) = write {
+        settingsPrefs.setCalendarHiddenIn(id, view, hidden)
+    }
+
     private val _error = MutableStateFlow(false)
     val error: StateFlow<Boolean> = _error.asStateFlow()
 
@@ -139,16 +154,43 @@ class CalendarsViewModel @Inject constructor(
         }
     }
 
-    fun createCalendar(displayName: String, color: Int, description: String?) = write {
-        repository.createLocalCalendar(displayName, color, description)
+    fun createCalendar(
+        displayName: String,
+        color: Int,
+        description: String?,
+        hiddenChanges: Map<CalendarView, Boolean>,
+    ) = write {
+        val id = repository.createLocalCalendar(displayName, color, description)
+        // The calendar exists now; a failed pref write must not read as a failed create.
+        bestEffort { settingsPrefs.applyCalendarHiddenChanges(id, hiddenChanges) }
     }
 
-    fun updateCalendar(id: Long, displayName: String, color: Int, description: String?) = write {
+    fun updateCalendar(
+        id: Long,
+        displayName: String,
+        color: Int,
+        description: String?,
+        hiddenChanges: Map<CalendarView, Boolean>,
+    ) = write {
+        // First: it doesn't depend on the provider, so a failed provider write shouldn't lose it.
+        settingsPrefs.applyCalendarHiddenChanges(id, hiddenChanges)
         repository.updateCalendar(id, displayName, color, description)
     }
 
     fun deleteCalendar(id: Long) = write {
         repository.deleteCalendar(id)
+        // Tidy-up only: the delete already landed, so a failure here isn't its failure.
+        bestEffort { settingsPrefs.setCalendarHiddenViews(id, emptySet()) }
+    }
+
+    private suspend fun bestEffort(block: suspend () -> Unit) {
+        try {
+            block()
+        } catch (e: CancellationException) {
+            throw e
+        } catch (e: Exception) {
+            Log.w("CalendarsViewModel", "Hidden-views write failed", e)
+        }
     }
 
     /**

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

@@ -112,7 +112,7 @@ fun CalendarDrawer(
             Spacer(Modifier.height(16.dp))
 
             DrawerSectionHeader(stringResource(R.string.filter_title))
-            CalendarFilterList()
+            CalendarFilterList(currentView = currentView)
 
             Spacer(Modifier.height(16.dp))
             GroupedRow(

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

@@ -0,0 +1,44 @@
+package de.jeanlucmakiola.calendula.ui.common
+
+import de.jeanlucmakiola.calendula.data.calendar.CalendarRepository
+import de.jeanlucmakiola.calendula.domain.EventInstance
+import de.jeanlucmakiola.calendula.domain.withoutCalendars
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.SharingStarted
+import kotlinx.coroutines.flow.catch
+import kotlinx.coroutines.flow.combine
+import kotlinx.coroutines.flow.distinctUntilChanged
+import kotlinx.coroutines.flow.map
+import kotlinx.coroutines.flow.shareIn
+import kotlin.time.Instant
+
+/** The calendars hidden in [view] under a per-calendar hidden-views map (#270). */
+fun Map<Long, Set<CalendarView>>.calendarsHiddenIn(view: CalendarView): Set<Long> =
+    filterValues { view in it }.keys
+
+/**
+ * The calendars hidden in [view], shared by everything one view model shows so
+ * the setting is read once rather than per page. A failed read hides nothing
+ * rather than failing the view; the replay expires with the last subscriber, so
+ * a returning view filters against a fresh read.
+ */
+fun Flow<Map<Long, Set<CalendarView>>>.calendarsHiddenIn(
+    view: CalendarView,
+    scope: CoroutineScope,
+): Flow<Set<Long>> =
+    catch { emit(emptyMap()) }
+        .map { it.calendarsHiddenIn(view) }
+        .distinctUntilChanged()
+        .shareIn(scope, SharingStarted.WhileSubscribed(replayExpirationMillis = 0), replay = 1)
+
+/**
+ * [CalendarRepository.instances] as one view shows them: also without the
+ * [hidden] calendars the user keeps out of it. Display only — reminders, search
+ * and widgets read the repository directly.
+ */
+fun CalendarRepository.instancesWithout(
+    range: ClosedRange<Instant>,
+    hidden: Flow<Set<Long>>,
+): Flow<List<EventInstance>> =
+    combine(instances(range), hidden) { instances, ids -> instances.withoutCalendars(ids) }

app/src/main/java/de/jeanlucmakiola/calendula/ui/filter/CalendarFilterList.kt

@@ -22,6 +22,8 @@ import de.jeanlucmakiola.calendula.R
 import de.jeanlucmakiola.calendula.domain.FailureReason
 import de.jeanlucmakiola.calendula.ui.common.CalendarAccountGroup
 import de.jeanlucmakiola.calendula.ui.common.CalendarColorChip
+import de.jeanlucmakiola.calendula.ui.common.CalendarView
+import de.jeanlucmakiola.calendula.ui.common.calendarsHiddenIn
 import de.jeanlucmakiola.calendula.ui.common.accountGroupTitle
 import de.jeanlucmakiola.calendula.ui.common.orUnnamed
 import de.jeanlucmakiola.floret.components.GroupedListInset
@@ -32,10 +34,12 @@ import de.jeanlucmakiola.floret.components.positionOf
  * Calendar-visibility filter (M3), rendered inline in the navigation drawer.
  * Every calendar grouped by account, each with a colour swatch and a visibility
  * switch; toggling writes straight to DataStore and every calendar view
- * re-filters live. Three states (Loading / Failure / Success).
+ * re-filters live. Three states (Loading / Failure / Success). A calendar hidden
+ * in [currentView] through its per-view setting (#270) says so on its row.
  */
 @Composable
 fun CalendarFilterList(
+    currentView: CalendarView,
     modifier: Modifier = Modifier,
     viewModel: FilterViewModel = hiltViewModel(),
 ) {
@@ -46,6 +50,7 @@ fun CalendarFilterList(
         is FilterUiState.Success -> FilterList(
             groups = s.groups,
             hidden = s.hidden,
+            hiddenInView = s.hiddenViews.calendarsHiddenIn(currentView),
             onSetVisible = viewModel::setVisible,
             modifier = modifier,
         )
@@ -61,6 +66,7 @@ fun CalendarFilterList(
 private fun FilterList(
     groups: List<CalendarAccountGroup>,
     hidden: Set<Long>,
+    hiddenInView: Set<Long>,
     onSetVisible: (Long, Boolean) -> Unit,
     modifier: Modifier = Modifier,
 ) {
@@ -81,6 +87,7 @@ private fun FilterList(
                 val visible = cal.id !in hidden
                 GroupedRow(
                     title = cal.displayName.orUnnamed(),
+                    summary = if (cal.id in hiddenInView) stringResource(R.string.filter_hidden_in_view) else null,
                     position = positionOf(index, group.calendars.size),
                     minHeight = 56.dp,
                     leading = { CalendarColorChip(cal.color) },

app/src/main/java/de/jeanlucmakiola/calendula/ui/filter/FilterUiState.kt

@@ -2,6 +2,7 @@ package de.jeanlucmakiola.calendula.ui.filter
 
 import de.jeanlucmakiola.calendula.domain.FailureReason
 import de.jeanlucmakiola.calendula.ui.common.CalendarAccountGroup
+import de.jeanlucmakiola.calendula.ui.common.CalendarView
 
 /**
  * State for the calendar-filter sheet (M3). The user toggles per-calendar
@@ -11,9 +12,13 @@ import de.jeanlucmakiola.calendula.ui.common.CalendarAccountGroup
 sealed interface FilterUiState {
     data object Loading : FilterUiState
     data class Failure(val reason: FailureReason) : FilterUiState
-    /** A calendar shows when its id is *not* in [hidden]. */
+    /**
+     * A calendar shows when its id is *not* in [hidden]; [hiddenViews] are the
+     * views each calendar is hidden in regardless (#270).
+     */
     data class Success(
         val groups: List<CalendarAccountGroup>,
         val hidden: Set<Long>,
+        val hiddenViews: Map<Long, Set<CalendarView>> = emptyMap(),
     ) : FilterUiState
 }

app/src/main/java/de/jeanlucmakiola/calendula/ui/filter/FilterViewModel.kt

@@ -5,6 +5,7 @@ import androidx.lifecycle.viewModelScope
 import dagger.hilt.android.lifecycle.HiltViewModel
 import de.jeanlucmakiola.calendula.data.calendar.CalendarRepository
 import de.jeanlucmakiola.calendula.data.prefs.CalendarPrefs
+import de.jeanlucmakiola.calendula.data.prefs.SettingsPrefs
 import de.jeanlucmakiola.calendula.domain.FailureReason
 import de.jeanlucmakiola.calendula.domain.calendarListFailure
 import de.jeanlucmakiola.calendula.ui.common.groupByAccount
@@ -23,6 +24,7 @@ import javax.inject.Inject
 class FilterViewModel @Inject constructor(
     private val repository: CalendarRepository,
     private val prefs: CalendarPrefs,
+    settingsPrefs: SettingsPrefs,
     @IoDispatcher private val io: CoroutineDispatcher,
 ) : ViewModel() {
 
@@ -30,7 +32,9 @@ class FilterViewModel @Inject constructor(
         combine(
             repository.calendars(),
             prefs.hiddenCalendarIds,
-        ) { calendars, hidden ->
+            // Only feeds a note on the rows; a failed read leaves it off rather than failing the list.
+            settingsPrefs.perCalendarHiddenViews.catch { emit(emptyMap()) },
+        ) { calendars, hidden, hiddenViews ->
             // Calendars switched off device-wide don't belong in the drawer's
             // hide/show list; they live only in Settings → Calendars.
             val enabled = calendars.filter { it.isVisibleInSystem }
@@ -38,7 +42,7 @@ class FilterViewModel @Inject constructor(
             if (failure != null) {
                 FilterUiState.Failure(failure)
             } else {
-                FilterUiState.Success(enabled.groupByAccount(), hidden)
+                FilterUiState.Success(enabled.groupByAccount(), hidden, hiddenViews)
             }
         }
             .catch { emit(FilterUiState.Failure(FailureReason.ProviderUnavailable)) }

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

@@ -19,7 +19,10 @@ import de.jeanlucmakiola.calendula.domain.calendarListFailure
 import de.jeanlucmakiola.calendula.ui.agenda.AgendaDay
 import de.jeanlucmakiola.calendula.ui.agenda.anchorTodayIfMissing
 import de.jeanlucmakiola.calendula.ui.common.CalendarSpan
+import de.jeanlucmakiola.calendula.ui.common.CalendarView
 import de.jeanlucmakiola.calendula.ui.common.PageStateCache
+import de.jeanlucmakiola.calendula.ui.common.calendarsHiddenIn
+import de.jeanlucmakiola.calendula.ui.common.instancesWithout
 import de.jeanlucmakiola.calendula.domain.isCrossedOut
 import de.jeanlucmakiola.calendula.domain.sortedForDisplay
 import de.jeanlucmakiola.calendula.ui.week.coversDay
@@ -68,6 +71,8 @@ class MonthViewModel @Inject constructor(
 
     private val zone = TimeZone.currentSystemDefault()
 
+    private val hiddenHere = settingsPrefs.perCalendarHiddenViews.calendarsHiddenIn(CalendarView.Month, viewModelScope)
+
     /** First day of the week, from the Settings preference (AUTO → locale). */
     val weekStart: StateFlow<DayOfWeek> = settingsPrefs.firstDayOfWeek(viewModelScope)
 
@@ -152,7 +157,7 @@ class MonthViewModel @Inject constructor(
     ) { (ym, ws) ->
         combine(
             repository.calendars(),
-            repository.instances(monthGridRange(ym, ws, zone)),
+            repository.instancesWithout(monthGridRange(ym, ws, zone), hiddenHere),
             today,
         ) { calendars, instances, today ->
             buildState(ym, ws, calendars, instances, today)
@@ -224,7 +229,7 @@ class MonthViewModel @Inject constructor(
                 val range = dayRange(first, last, zone)
                 combine(
                     repository.calendars(),
-                    repository.instances(range),
+                    repository.instancesWithout(range, hiddenHere),
                     today,
                 ) { calendars, instances, today ->
                     buildContinuousState(window, ws, style, calendars, instances, today)

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

@@ -89,7 +89,7 @@ internal fun CalendarsStep(
             initialName = "",
             initialColor = CalendarColorPalette.all.first(),
             initialDescription = "",
-            onSave = { name, color, description ->
+            onSave = { name, color, description, _ ->
                 if (!submitted) {
                     submitted = true
                     onCreateLocal(name, color, description)

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

@@ -19,7 +19,10 @@ import de.jeanlucmakiola.calendula.domain.displayPriority
 import de.jeanlucmakiola.calendula.domain.displayStart
 import de.jeanlucmakiola.calendula.domain.FailureReason
 import de.jeanlucmakiola.calendula.domain.calendarListFailure
+import de.jeanlucmakiola.calendula.ui.common.CalendarView
 import de.jeanlucmakiola.calendula.ui.common.PageStateCache
+import de.jeanlucmakiola.calendula.ui.common.calendarsHiddenIn
+import de.jeanlucmakiola.calendula.ui.common.instancesWithout
 import de.jeanlucmakiola.floret.android.stateWhileSubscribed
 import de.jeanlucmakiola.floret.di.IoDispatcher
 import kotlinx.coroutines.CoroutineDispatcher
@@ -89,8 +92,11 @@ abstract class PagedTimelineViewModel(
     private val io: CoroutineDispatcher,
     gridRule: Flow<(LocalDate) -> DaysGrid>,
     initialRule: (LocalDate) -> DaysGrid,
+    view: CalendarView,
 ) : ViewModel() {
 
+    private val hiddenHere = settingsPrefs.perCalendarHiddenViews.calendarsHiddenIn(view, viewModelScope)
+
     /**
      * The zone every page is laid out in; drags and drops resolve in it too, and
      * pages lay out again when the device moves zones (#387).
@@ -167,7 +173,7 @@ abstract class PagedTimelineViewModel(
         zone.flatMapLatest { zone ->
             combine(
                 repository.calendars(),
-                repository.instances(spanRange(span.start, span.count, zone)),
+                repository.instancesWithout(spanRange(span.start, span.count, zone), hiddenHere),
                 today,
             ) { calendars, instances, today ->
                 buildState(span, calendars, instances, today, zone)
@@ -240,6 +246,7 @@ class WeekViewModel @Inject constructor(
         rule
     },
     initialRule = { DaysGrid.weeks(DayOfWeek.MONDAY) },
+    view = CalendarView.Week,
 )
 
 /**
@@ -264,6 +271,7 @@ class MultiDayViewModel @Inject constructor(
         { anchor: LocalDate -> DaysGrid.startingAt(anchor, count) }
     },
     initialRule = { DaysGrid.startingAt(it, SettingsPrefs.DEFAULT_MULTI_DAY_COUNT) },
+    view = CalendarView.MultiDay,
 )
 
 /** The day view: the timeline one day at a time. */
@@ -282,6 +290,7 @@ class DayViewModel @Inject constructor(
     io = io,
     gridRule = flowOf { _: LocalDate -> DaysGrid.days },
     initialRule = { DaysGrid.days },
+    view = CalendarView.Day,
 )
 
 /**

app/src/main/java/de/jeanlucmakiola/calendula/widget/WidgetConfig.kt

@@ -11,7 +11,6 @@ import androidx.glance.GlanceId
 import androidx.glance.appwidget.state.getAppWidgetState
 import androidx.glance.state.PreferencesGlanceStateDefinition
 import de.jeanlucmakiola.calendula.data.prefs.PastEventDisplay
-import de.jeanlucmakiola.calendula.domain.EventInstance
 import de.jeanlucmakiola.calendula.ui.agenda.AgendaRange
 import de.jeanlucmakiola.calendula.ui.agenda.parseAgendaRange
 import de.jeanlucmakiola.calendula.ui.agenda.storageValue
@@ -116,8 +115,5 @@ internal fun MutablePreferences.putHiddenCalendars(ids: Set<Long>) {
     this[HiddenCalendarsKey] = ids.map(Long::toString).toSet()
 }
 
-internal fun List<EventInstance>.withoutCalendars(hidden: Set<Long>): List<EventInstance> =
-    if (hidden.isEmpty()) this else filterNot { it.calendarId in hidden }
-
 internal suspend fun Context.widgetState(id: GlanceId): Preferences =
     getAppWidgetState(this, PreferencesGlanceStateDefinition, id)

app/src/main/java/de/jeanlucmakiola/calendula/widget/WidgetData.kt

@@ -14,6 +14,7 @@ import de.jeanlucmakiola.calendula.data.prefs.WeekStartPref
 import de.jeanlucmakiola.calendula.data.prefs.is24Hour
 import de.jeanlucmakiola.calendula.data.prefs.resolveFirstDay
 import de.jeanlucmakiola.calendula.domain.EventInstance
+import de.jeanlucmakiola.calendula.domain.withoutCalendars
 import de.jeanlucmakiola.calendula.ui.agenda.AgendaDay
 import de.jeanlucmakiola.calendula.ui.agenda.AgendaRange
 import de.jeanlucmakiola.calendula.ui.agenda.agendaRange

app/src/main/java/de/jeanlucmakiola/calendula/widget/countdown/CountdownData.kt

@@ -12,6 +12,7 @@ import de.jeanlucmakiola.floret.glance.updateWithRefresh
 import kotlinx.coroutines.CancellationException
 import de.jeanlucmakiola.calendula.data.prefs.is24Hour
 import de.jeanlucmakiola.calendula.domain.EventInstance
+import de.jeanlucmakiola.calendula.domain.withoutCalendars
 import de.jeanlucmakiola.calendula.widget.Themed
 import de.jeanlucmakiola.calendula.widget.WidgetKind
 import de.jeanlucmakiola.calendula.widget.WidgetLoadContext
@@ -22,7 +23,6 @@ import de.jeanlucmakiola.calendula.widget.today
 import de.jeanlucmakiola.calendula.widget.widgetEntryPoint
 import de.jeanlucmakiola.calendula.widget.widgetLoadContext
 import de.jeanlucmakiola.calendula.widget.widgetState
-import de.jeanlucmakiola.calendula.widget.withoutCalendars
 import de.jeanlucmakiola.floret.prefs.toEnum
 import kotlinx.coroutines.flow.first
 import kotlinx.datetime.LocalDate

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

@@ -849,7 +849,7 @@
     <string name="calendars_state_managed">Filled from your contacts</string>
     <string name="calendars_managed_delete_locked">This calendar is filled from your contacts, so Calendula would create it again on the next sync. Turn special dates off under Settings → Special dates to delete it.</string>
     <string name="calendars_synced_header">Synced calendars</string>
-    <string name="calendars_synced_hint">These come from accounts on your device. Create and edit them in their own app.</string>
+    <string name="calendars_synced_hint">These come from accounts on your device. Create and edit them in their own app; tap one here to hide it in some views.</string>
     <string name="calendars_manage_in_app">Manage in app</string>
     <!-- Account header when two accounts share a name: %1$s is the account, %2$s the app it comes from. -->
     <string name="calendars_account_from_source">%1$s (%2$s)</string>
@@ -863,6 +863,11 @@
     <string name="calendars_color_label">Color</string>
     <string name="calendars_description_label">Description</string>
     <string name="calendars_description_hint">Add a description</string>
+    <string name="calendars_hide_in_views">Hide in views</string>
+    <string name="calendars_hide_in_views_hint">Events from “%1$s” stay out of the views checked here. Reminders, search and widgets still include them.</string>
+    <string name="calendars_hide_in_views_none">Shown in every view</string>
+    <string name="calendars_hidden_in">Hidden in %1$s</string>
+    <string name="filter_hidden_in_view">Hidden in this view</string>
     <string name="color_name_mauve">Mauve</string>
     <string name="color_name_red">Red</string>
     <string name="color_name_orange">Orange</string>

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

@@ -616,6 +616,63 @@ class SettingsPrefsTest {
         assertThat(prefs.perCalendarEventDuration.first()).containsExactly(9L, 45)
     }
 
+    @Test
+    fun `per-calendar hidden views round-trip and clear back to every view`(
+        @TempDir tempDir: Path,
+    ) = runTest {
+        val prefs = testSettings(tempDir)
+        assertThat(prefs.perCalendarHiddenViews.first()).isEmpty()
+        prefs.setCalendarHiddenViews(7L, setOf(CalendarView.Month, CalendarView.Agenda))
+        prefs.setCalendarHiddenViews(9L, setOf(CalendarView.MultiDay))
+        assertThat(prefs.perCalendarHiddenViews.first()).containsExactly(
+            7L, setOf(CalendarView.Month, CalendarView.Agenda),
+            9L, setOf(CalendarView.MultiDay),
+        )
+        prefs.setCalendarHiddenViews(7L, emptySet())
+        assertThat(prefs.perCalendarHiddenViews.first()).containsExactly(9L, setOf(CalendarView.MultiDay))
+    }
+
+    @Test
+    fun `toggling one hidden view keeps the others and clears the entry when empty`(
+        @TempDir tempDir: Path,
+    ) = runTest {
+        val prefs = testSettings(tempDir)
+        prefs.setCalendarHiddenIn(7L, CalendarView.Month, hidden = true)
+        prefs.setCalendarHiddenIn(7L, CalendarView.Week, hidden = true)
+        assertThat(prefs.perCalendarHiddenViews.first())
+            .containsExactly(7L, setOf(CalendarView.Month, CalendarView.Week))
+        prefs.setCalendarHiddenIn(7L, CalendarView.Month, hidden = false)
+        prefs.setCalendarHiddenIn(7L, CalendarView.Week, hidden = false)
+        assertThat(prefs.perCalendarHiddenViews.first()).isEmpty()
+    }
+
+    @Test
+    fun `garbage hidden-views entries are dropped, the rest survive`(
+        @TempDir tempDir: Path,
+    ) = runTest {
+        val store = testDataStore(tempDir, "test_settings")
+        val prefs = SettingsPrefs(store)
+        store.updateData { p ->
+            val m = p.toMutablePreferences()
+            // A bad id, only an unknown view, no separator, and a good entry with one unknown view.
+            m[stringPreferencesKey("per_calendar_hidden_views")] = "x=Month;7=Year;8;9=Month,Year,Agenda"
+            m
+        }
+        assertThat(prefs.perCalendarHiddenViews.first())
+            .containsExactly(9L, setOf(CalendarView.Month, CalendarView.Agenda))
+    }
+
+    @Test
+    fun `hidden views serialise in view order and drop empty entries`() {
+        val stored = mapOf(
+            3L to setOf(CalendarView.Agenda, CalendarView.Month),
+            1L to emptySet(),
+        ).toStoredHiddenViews()
+        assertThat(stored).isEqualTo("3=Month,Agenda")
+        assertThat(emptyMap<Long, Set<CalendarView>>().toStoredHiddenViews()).isNull()
+        assertThat(parseHiddenViews(stored)).containsExactly(3L, setOf(CalendarView.Month, CalendarView.Agenda))
+    }
+
     @Test
     fun `resolveDefaultEventDuration prefers the calendar's own length`() {
         val overrides = mapOf(7L to 480)

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

@@ -0,0 +1,85 @@
+package de.jeanlucmakiola.calendula.ui.common
+
+import app.cash.turbine.test
+import com.google.common.truth.Truth.assertThat
+import de.jeanlucmakiola.calendula.data.calendar.FakeCalendarDataSource
+import de.jeanlucmakiola.calendula.domain.CalendarSource
+import de.jeanlucmakiola.calendula.testEvent
+import de.jeanlucmakiola.calendula.testRepository
+import de.jeanlucmakiola.calendula.testSettings
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.flow.first
+import kotlinx.coroutines.test.UnconfinedTestDispatcher
+import kotlinx.coroutines.test.runTest
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.io.TempDir
+import java.nio.file.Path
+import kotlin.time.Instant
+
+@OptIn(ExperimentalCoroutinesApi::class)
+class ViewHiddenCalendarsTest {
+
+    private val range = Instant.fromEpochMilliseconds(0)..Instant.fromEpochMilliseconds(10_000_000_000L)
+
+    private fun event(id: Long, calendarId: Long) = testEvent(
+        id = id,
+        calendarId = calendarId,
+        title = "E $id",
+        start = Instant.fromEpochMilliseconds(1_000_000_000L),
+        end = Instant.fromEpochMilliseconds(1_000_003_600L),
+        color = 0,
+    )
+
+    private fun calendar(id: Long) = CalendarSource(id, "Cal $id", "x@y", "LOCAL", 0, true)
+
+    @Test
+    fun `calendarsHiddenIn picks only the calendars hidden in that view`() {
+        val map = mapOf(
+            1L to setOf(CalendarView.Month),
+            2L to setOf(CalendarView.Month, CalendarView.Agenda),
+            3L to setOf(CalendarView.Week),
+        )
+        assertThat(map.calendarsHiddenIn(CalendarView.Month)).containsExactly(1L, 2L)
+        assertThat(map.calendarsHiddenIn(CalendarView.Agenda)).containsExactly(2L)
+        assertThat(map.calendarsHiddenIn(CalendarView.Day)).isEmpty()
+    }
+
+    @Test
+    fun `instancesWithout drops a calendar only in the views it is hidden in`(@TempDir tempDir: Path) = runTest {
+        val fake = FakeCalendarDataSource().apply {
+            calendarsResult = listOf(calendar(1L), calendar(2L))
+            instancesResult = { _, _ -> listOf(event(10L, 1L), event(20L, 2L)) }
+        }
+        val settings = testSettings(tempDir)
+        val repo = testRepository(fake, tempDir, UnconfinedTestDispatcher(testScheduler), settings = settings)
+        settings.setCalendarHiddenViews(2L, setOf(CalendarView.Month))
+        val hidden = settings.perCalendarHiddenViews
+
+        assertThat(repo.instancesWithout(range, hidden.calendarsHiddenIn(CalendarView.Month, backgroundScope)).first().map { it.eventId })
+            .containsExactly(10L)
+        assertThat(repo.instancesWithout(range, hidden.calendarsHiddenIn(CalendarView.Week, backgroundScope)).first().map { it.eventId })
+            .containsExactly(10L, 20L)
+        // The repository itself, which reminders and search build on, is untouched.
+        assertThat(repo.instances(range).first().map { it.eventId }).containsExactly(10L, 20L)
+    }
+
+    @Test
+    fun `instancesWithout re-filters live when the setting changes`(@TempDir tempDir: Path) = runTest {
+        val fake = FakeCalendarDataSource().apply {
+            calendarsResult = listOf(calendar(1L), calendar(2L))
+            instancesResult = { _, _ -> listOf(event(10L, 1L), event(20L, 2L)) }
+        }
+        val settings = testSettings(tempDir)
+        val repo = testRepository(fake, tempDir, UnconfinedTestDispatcher(testScheduler), settings = settings)
+
+        val hidden = settings.perCalendarHiddenViews.calendarsHiddenIn(CalendarView.Agenda, backgroundScope)
+        repo.instancesWithout(range, hidden).test {
+            assertThat(awaitItem().map { it.eventId }).containsExactly(10L, 20L)
+            settings.setCalendarHiddenIn(1L, CalendarView.Agenda, hidden = true)
+            assertThat(awaitItem().map { it.eventId }).containsExactly(20L)
+            settings.setCalendarHiddenIn(1L, CalendarView.Agenda, hidden = false)
+            assertThat(awaitItem().map { it.eventId }).containsExactly(10L, 20L)
+            cancelAndIgnoreRemainingEvents()
+        }
+    }
+}

docs/ARCHITECTURE.md

@@ -389,7 +389,11 @@ pre-permission launch); `CalendarVisibilityReconciler` drains it entry by entry,
 and until it does, the repository and `ReminderNotifier.post` honour it. That
 gate also covers a snooze re-shown from our own alarm after its calendar was
 switched off. The drawer's filter sheet (`CalendarPrefs.hiddenCalendarIds`) is a
-separate in-app declutter that never touches reminders.
+separate in-app declutter that never touches reminders. Narrower still is the per-view hide
+(`SettingsPrefs.perCalendarHiddenViews`, #270): each view model asks for its
+events through `instancesWithout(range, calendarsHiddenIn(view, …))`, which drops
+the calendars hidden in that one view on top of the repository's filters; reminders, search and widgets read
+the repository and never see it.
 
 Deliberately absent: a fallback to the provider's `EVENT_REMINDER` broadcast.
 Keeping both would double-post wherever the provider works, and Etar's way out —