Drag an event to reschedule it (#135)

Reviewed-on: https://codeberg.org/jlmakiola/calendula/pulls/135
This commit is contained in:
Jean-Luc Makiola
2026-08-02 20:36:09 +02:00
parent 44233cff35
commit 4e38866dfd
33 changed files with 3721 additions and 196 deletions

View File

@@ -125,6 +125,7 @@ internal fun ColumnReader.toEventDetailCore(
selfStatus = mapAttendeeStatus(getInt(EventDetailProjection.IDX_SELF_ATTENDEE_STATUS)),
eventColor = eventColor,
eventColorKey = eventColorKey,
isException = !isNull(EventDetailProjection.IDX_ORIGINAL_ID),
)
}

View File

@@ -89,6 +89,9 @@ internal object EventDetailProjection {
// Recurring rows carry DURATION instead of DTEND; the detail screen
// needs it to render a series opened without a named occurrence.
CalendarContract.Events.DURATION,
// Non-null on a modified-occurrence exception row; "no RRULE" alone
// can't tell an exception from a master (#68).
CalendarContract.Events.ORIGINAL_ID,
)
const val IDX_EVENT_ID = 0
@@ -110,6 +113,7 @@ internal object EventDetailProjection {
const val IDX_SELF_ATTENDEE_STATUS = 16
const val IDX_EVENT_COLOR_KEY = 17
const val IDX_DURATION = 18
const val IDX_ORIGINAL_ID = 19
}
/**

View File

@@ -44,6 +44,14 @@ val CalendarSource.hasVisibilitySwitch: Boolean
val CalendarSource.isEventTarget: Boolean
get() = canModifyContents && isVisibleInSystem && !isManaged && !isNotSynced
/**
* Whether this calendar's events may have their times rewritten by a drag (#68).
* Deliberately not [isEventTarget]: a managed event stays editable (reminders,
* notes) yet must never move, since the next contacts sync would put it back.
*/
val CalendarSource.allowsEventMove: Boolean
get() = canModifyContents && !isManaged
/** Every state worth naming on this calendar's row, in reading order. */
fun CalendarSource.stateLabels(): List<CalendarStateLabel> = buildList {
if (isManaged) add(CalendarStateLabel.MANAGED)

View File

@@ -0,0 +1,53 @@
package de.jeanlucmakiola.calendula.domain
import kotlinx.datetime.DateTimeUnit
import kotlinx.datetime.LocalDateTime
import kotlinx.datetime.TimeZone
import kotlinx.datetime.plus
import kotlinx.datetime.toInstant
import kotlinx.datetime.toLocalDateTime
import kotlin.time.Instant
/**
* The zone this form's wall-clock times mean, matching what the data layer
* resolves them in at write time: the form's own pinned zone, else [deviceZone].
*/
fun EventForm.resolvedZone(deviceZone: TimeZone): TimeZone =
timezone?.let { runCatching { TimeZone.of(it) }.getOrNull() } ?: deviceZone
/**
* The form moved so it starts at [newStart], keeping its **instant** duration —
* a recurring event's length travels to the provider as `DURATION`, so keeping
* wall clock instead would rewrite the series' length across a DST boundary.
*
* All-day events are date-anchored — use [shiftedByDays]; this returns them
* untouched.
*/
fun EventForm.shiftedTo(newStart: Instant, deviceZone: TimeZone): EventForm {
if (isAllDay) return this
val zone = resolvedZone(deviceZone)
val span = end.toInstant(zone) - start.toInstant(zone)
return copy(
start = newStart.toLocalDateTime(zone),
end = (newStart + span).toLocalDateTime(zone),
)
}
/**
* The form moved [days] calendar days, keeping its time of day and its span.
* All-day events are pure date arithmetic; a timed one preserves its **instant**
* duration, for the same reason [shiftedTo] does.
*/
fun EventForm.shiftedByDays(days: Int, deviceZone: TimeZone): EventForm {
if (days == 0) return this
val newStart = LocalDateTime(start.date.plus(days, DateTimeUnit.DAY), start.time)
if (isAllDay) {
return copy(
start = newStart,
end = LocalDateTime(end.date.plus(days, DateTimeUnit.DAY), end.time),
)
}
val zone = resolvedZone(deviceZone)
val span = end.toInstant(zone) - start.toInstant(zone)
return copy(start = newStart, end = (newStart.toInstant(zone) + span).toLocalDateTime(zone))
}

View File

@@ -124,6 +124,12 @@ data class EventDetail(
val eventColor: Int? = null,
/** The event's `Events.EVENT_COLOR_KEY` (a calendar-palette key), or null. */
val eventColorKey: String? = null,
/**
* True when this row is a modified occurrence of a series (`ORIGINAL_ID` is
* set) rather than a master, so a reschedule takes the plain whole-row path
* whatever [rrule] a sync adapter left on it.
*/
val isException: Boolean = false,
)
/**

View File

@@ -138,7 +138,7 @@ fun SimpleRecurrence.toRRule(zone: TimeZone = TimeZone.currentSystemDefault()):
}
}
private val RRULE_DAY_CODES: Map<DayOfWeek, String> = mapOf(
internal val RRULE_DAY_CODES: Map<DayOfWeek, String> = mapOf(
DayOfWeek.MONDAY to "MO",
DayOfWeek.TUESDAY to "TU",
DayOfWeek.WEDNESDAY to "WE",

View File

@@ -0,0 +1,48 @@
package de.jeanlucmakiola.calendula.domain
import kotlinx.datetime.LocalDate
/**
* [rrule] re-anchored from an occurrence on [oldStart] to one on [newStart].
*
* `Events.RRULE` is written verbatim while DTSTART moves, so `FREQ=WEEKLY;BYDAY=MO`
* would keep naming Monday after the anchor became a Wednesday and the series
* would not move at all — `BYDAY` is re-derived from [newStart].
*
* Only weekly `BYDAY` is realigned, and only for a whole-day move: the rule has
* to agree with the series *anchor*, and weekday arithmetic is the only kind
* that survives the same wall-clock shift unchanged. Everything else returns
* null, as do rules one moved occurrence can't resolve (`BYDAY=MO,WE`, `2TH`,
* `BYSETPOS`). The accepted parts are a subset of [parseSimpleRecurrence], so
* anything realignable is also a rule [problems] can check the `UNTIL` of.
*/
fun realignRecurrence(rrule: String, oldStart: LocalDate, newStart: LocalDate): String? {
if (oldStart == newStart) return rrule
val prefix = if (rrule.startsWith("RRULE:")) "RRULE:" else ""
val parts = rrule.removePrefix("RRULE:").split(';').filter { it.isNotBlank() }
if (parts.isEmpty()) return null
var weekly = false
val rebuilt = parts.map { part ->
val eq = part.indexOf('=')
if (eq <= 0) return null
val key = part.substring(0, eq).uppercase()
val value = part.substring(eq + 1).trim()
when (key) {
"FREQ" -> {
weekly = value.equals("WEEKLY", ignoreCase = true)
part
}
"BYDAY" -> {
val old = RRULE_DAY_CODES[oldStart.dayOfWeek] ?: return null
if (!value.equals(old, ignoreCase = true)) return null
"BYDAY=${RRULE_DAY_CODES.getValue(newStart.dayOfWeek)}"
}
"INTERVAL", "COUNT", "UNTIL", "WKST" -> part
else -> return null
}
}
// BYDAY is only simple on a weekly rule, matching parseSimpleRecurrence.
if (!weekly && parts.any { it.substringBefore('=').trim().uppercase() == "BYDAY" }) return null
if (parts.none { it.substringBefore('=').trim().uppercase() == "FREQ" }) return null
return prefix + rebuilt.joinToString(";")
}

View File

@@ -10,6 +10,7 @@ import androidx.compose.animation.slideOutHorizontally
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.fillMaxSize
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
@@ -27,6 +28,10 @@ import de.jeanlucmakiola.calendula.ui.calendars.BackupScreen
import de.jeanlucmakiola.calendula.ui.calendars.CalendarsScreen
import de.jeanlucmakiola.floret.identity.fadeThrough
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.RescheduleViewModel
import de.jeanlucmakiola.calendula.ui.common.drillToDay
import de.jeanlucmakiola.calendula.ui.common.rememberCalendarSlideSpec
import de.jeanlucmakiola.calendula.ui.common.selectView
@@ -294,6 +299,29 @@ fun CalendarHost(
}
}
// Drag to reschedule (#68). Hosted here so one instance serves every view and
// survives view switches; the calendar surfaces read it out of LocalEventMove.
val reschedule: RescheduleViewModel = hiltViewModel()
val movableCalendarIds by reschedule.movableCalendarIds.collectAsStateWithLifecycle()
val onEditEvent: (EventInstance) -> Unit = { event ->
val key = longArrayOf(
event.eventId,
event.start.toEpochMilliseconds(),
event.end.toEpochMilliseconds(),
)
heldEditKey = key
editKey = key
}
val moveScope = remember(movableCalendarIds, reschedule) {
EventMoveScope(
movableCalendarIds = movableCalendarIds,
move = reschedule::move,
inFlight = reschedule.inFlight,
undoStarted = reschedule.undoStarted,
edit = onEditEvent,
)
}
val slideSpec = rememberCalendarSlideSpec()
// Base-level back: pop the view stack while no overlay covers it (each overlay
@@ -311,6 +339,7 @@ fun CalendarHost(
// navigation, so it fades through rather than sliding — paging *within* a
// view keeps the directional slide. AnimatedContent keyed on the view type.
val viewSwitch = fadeThrough()
CompositionLocalProvider(LocalEventMove provides moveScope) {
AnimatedContent(
targetState = view,
transitionSpec = { viewSwitch },
@@ -367,6 +396,11 @@ fun CalendarHost(
)
}
}
}
// Scope prompt + confirmation/undo snackbar for a dropped event, declared
// right after the calendar views so later overlays cover it.
EventMoveHost(reschedule, modifier = Modifier.fillMaxSize())
// Search overlay — below detail/edit in the Box so a tapped result's
// detail screen draws on top, and closing it returns to the results.

View File

@@ -0,0 +1,75 @@
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.snap
import androidx.compose.material3.ExperimentalMaterial3ExpressiveApi
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.runtime.Immutable
import androidx.compose.runtime.getValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.text.style.TextOverflow
import androidx.compose.ui.unit.Dp
import de.jeanlucmakiola.floret.identity.rememberReduceMotion
/**
* A timed block's own time label, crossfaded rather than replaced — the block
* slides to its new slot, so the label shouldn't change in a single frame.
*/
@OptIn(ExperimentalMaterial3ExpressiveApi::class)
@Composable
fun BlockTimeLabel(label: String, color: Color, modifier: Modifier = Modifier) {
val spec: FiniteAnimationSpec<Float> = if (rememberReduceMotion()) {
snap()
} else {
MaterialTheme.motionScheme.fastEffectsSpec()
}
Crossfade(
targetState = label,
animationSpec = spec,
label = "block-time",
modifier = modifier,
) { text ->
Text(
text = text,
style = MaterialTheme.typography.labelSmall,
maxLines = 1,
overflow = TextOverflow.Ellipsis,
color = color,
)
}
}
/** Where a timed block sits in its column, after tweening. */
@Immutable
data class BlockPlacement(val x: Dp, val y: Dp, val width: Dp, val height: Dp)
/**
* A timed block's placement, tweened rather than jumped. Continuity comes from
* the caller keying each block by identity; a block composed for the first time
* starts at its target, so nothing flies in on the first frame.
*
* A pinch-zoom rewrites the hour height every pointer frame, and the gutter and
* grid lines follow it instantly — so the tween stands down for the gesture
* rather than leaving the blocks trailing the ruler they are measured against.
*/
@OptIn(ExperimentalMaterial3ExpressiveApi::class)
@Composable
fun animatedBlockPlacement(x: Dp, y: Dp, width: Dp, height: Dp): BlockPlacement {
val spec: FiniteAnimationSpec<Dp> = if (rememberReduceMotion() ||
LocalTimelineZoom.current.isPinching
) {
snap()
} else {
MaterialTheme.motionScheme.fastSpatialSpec()
}
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)
}

View File

@@ -0,0 +1,150 @@
package de.jeanlucmakiola.calendula.ui.common
import androidx.compose.foundation.gestures.awaitEachGesture
import androidx.compose.foundation.gestures.awaitFirstDown
import androidx.compose.runtime.Composable
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.runtime.getValue
import androidx.compose.runtime.remember
import androidx.compose.runtime.rememberUpdatedState
import androidx.compose.ui.Modifier
import androidx.compose.ui.geometry.Offset
import androidx.compose.ui.hapticfeedback.HapticFeedbackType
import androidx.compose.ui.input.pointer.PointerEventPass
import androidx.compose.ui.input.pointer.pointerInput
import androidx.compose.ui.layout.LayoutCoordinates
import androidx.compose.ui.layout.onGloballyPositioned
import androidx.compose.ui.layout.positionInRoot
import androidx.compose.ui.platform.LocalDensity
import androidx.compose.ui.platform.LocalHapticFeedback
import androidx.compose.ui.platform.LocalViewConfiguration
import androidx.compose.ui.unit.IntSize
import androidx.compose.ui.unit.dp
/** How far the finger may wander during the hold — well under touch slop. */
private val PICKUP_TOLERANCE = 6.dp
/**
* Pick an event block up with a long press and drag it, without
* `detectDragGesturesAfterLongPress`: the stock detector cancels as soon as an
* ancestor consumes or the finger leaves the block, which a
* `MIN_EVENT_FRACTION`-tall block loses immediately. Movement before the timeout
* is deliberately not consumed, so a scroll starting on top of a block survives.
*/
@Composable
fun rememberEventDragSource(
enabled: Boolean,
key: Any?,
onPickUp: (pointerInRoot: Offset, blockInRoot: Offset, size: IntSize) -> Unit,
onMove: (pointerInRoot: Offset) -> Unit,
onDrop: () -> Unit,
onCancel: () -> Unit,
): Modifier = rememberDragSurface(
enabled = enabled,
key = key,
onPickUp = { _, pointerInRoot, nodeInRoot, size ->
onPickUp(pointerInRoot, nodeInRoot, size)
true
},
onMove = onMove,
onDrop = onDrop,
onCancel = onCancel,
)
/**
* The same pickup, for a surface that carries many draggable pieces rather than
* being one itself — the month grid, whose chips are covered by a full-bleed tap
* layer. [onPickUp] receives the press position local to this node and answers
* whether anything is there; false abandons the gesture.
*/
@Composable
fun rememberDragSurface(
enabled: Boolean,
key: Any?,
onPickUp: (local: Offset, pointerInRoot: Offset, nodeInRoot: Offset, size: IntSize) -> Boolean,
onMove: (pointerInRoot: Offset) -> Unit,
onDrop: () -> Unit,
onCancel: () -> Unit,
): Modifier {
if (!enabled) return Modifier
val holdMillis = LocalViewConfiguration.current.longPressTimeoutMillis
val tolerance = with(LocalDensity.current) { PICKUP_TOLERANCE.toPx() }
val coordinates = remember { arrayOfNulls<LayoutCoordinates>(1) }
val currentPickUp by rememberUpdatedState(onPickUp)
val currentMove by rememberUpdatedState(onMove)
val currentDrop by rememberUpdatedState(onDrop)
val currentCancel by rememberUpdatedState(onCancel)
return Modifier
.onGloballyPositioned { coordinates[0] = it }
.pointerInput(key) {
awaitEachGesture {
val down = awaitFirstDown(requireUnconsumed = false)
val origin = down.position
val heldStill = withTimeoutOrNull(holdMillis) {
while (true) {
val main = awaitPointerEvent()
val change = main.changes.firstOrNull { it.id == down.id } ?: break
if (!change.pressed) break
if (main.changes.count { it.pressed } > 1) break
if ((change.position - origin).getDistance() > tolerance) break
// An ancestor's claim only becomes visible once the whole
// main pass has run, so look again on the final pass.
val final = awaitPointerEvent(PointerEventPass.Final)
if (final.changes.any { it.isConsumed }) break
}
} == null
if (!heldStill) return@awaitEachGesture
val layout = coordinates[0]?.takeIf { it.isAttached } ?: return@awaitEachGesture
val took = currentPickUp(
down.position,
layout.localToRoot(down.position),
layout.positionInRoot(),
layout.size,
)
if (!took) return@awaitEachGesture
var dropped = false
try {
// Driven on the initial pass, which runs parent → child: an
// ancestor that outranks us (the pinch) has already consumed
// by the time we look, and descendants — the month grid's
// full-bleed tap layer — see our consumption.
while (true) {
val event = awaitPointerEvent(PointerEventPass.Initial)
val change = event.changes.firstOrNull { it.id == down.id } ?: break
if (change.isConsumed) break
if (!change.pressed) {
change.consume()
dropped = true
break
}
if (event.changes.count { it.pressed } > 1) break
change.consume()
coordinates[0]?.takeIf { it.isAttached }
?.let { currentMove(it.localToRoot(change.position)) }
}
} finally {
// Also reached when the pointer node is disposed mid-drag —
// a cancel, not a drop, and must never write.
if (dropped) currentDrop() else currentCancel()
}
}
}
}
/** A lift on pickup, then a tick every time the drop target snaps to a new slot. */
@Composable
fun DragSnapHaptics(slot: Any?) {
val haptics = LocalHapticFeedback.current
val previous = remember { arrayOfNulls<Any>(1) }
LaunchedEffect(slot) {
val had = previous[0]
previous[0] = slot
when {
slot == null -> Unit
had == null -> haptics.performHapticFeedback(HapticFeedbackType.LongPress)
had != slot -> haptics.performHapticFeedback(HapticFeedbackType.SegmentTick)
}
}
}

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@@ -0,0 +1,144 @@
package de.jeanlucmakiola.calendula.ui.common
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.BoxWithConstraints
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.navigationBarsPadding
import androidx.compose.foundation.layout.padding
import androidx.compose.runtime.Composable
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
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.unit.dp
import androidx.lifecycle.compose.collectAsStateWithLifecycle
import de.jeanlucmakiola.calendula.R
import de.jeanlucmakiola.floret.components.SnackChip
import de.jeanlucmakiola.floret.components.SnackChipHeight
import de.jeanlucmakiola.floret.components.SnackChipMargin
import de.jeanlucmakiola.floret.locale.currentLocale
import de.jeanlucmakiola.floret.locale.localizedDateFormatter
import kotlinx.coroutines.delay
import java.time.Instant
import java.time.ZoneId
import java.time.ZoneOffset
import java.util.Locale
/** How long the confirmation chip stays up, matching a short snackbar. */
private const val CHIP_MILLIS = 4_000L
/** How long an *undone* move stays up — shorter, since it offers nothing to act on. */
private const val UNDONE_CHIP_MILLIS = 1_600L
/** What the chip currently reads, kept past the outcome it was built from. */
private data class ChipContent(val message: String, val undo: MoveUndo?)
/** The FAB's own band at the bottom end, which the chip must not run into. */
private val FAB_BAND = 88.dp
/**
* The two surfaces a drag-and-drop reschedule needs on top of the calendar: the
* recurring-scope prompt, and the confirmation chip carrying Undo. None of the
* calendar screens sets a `snackbarHost`, so this hosts its own confirmation as
* a pill on the FAB's band, leaving the calendar visible behind it.
*/
@Composable
fun EventMoveHost(viewModel: RescheduleViewModel, modifier: Modifier = Modifier) {
val prompt by viewModel.scopePrompt.collectAsStateWithLifecycle()
val outcome by viewModel.outcome.collectAsStateWithLifecycle()
val undoTick by viewModel.undoStarted.collectAsStateWithLifecycle()
val writeInFlight by viewModel.inFlight.collectAsStateWithLifecycle()
val locale = currentLocale()
val use24Hour = LocalUse24HourFormat.current
prompt?.let { pending ->
RecurringScopeDialog(
title = stringResource(R.string.event_move_recurring_title),
onSelect = viewModel::moveWithScope,
onDismiss = viewModel::cancelScope,
allowSeries = !pending.occurrenceOnly,
reason = stringResource(R.string.event_move_occurrence_only)
.takeIf { pending.occurrenceOnly },
)
}
val moved = outcome as? MoveOutcome.Moved
val movedLabel = moved?.let { formatMovedTo(it.startMillis, it.isAllDay, use24Hour, locale) }
val message = when (outcome) {
null -> null
is MoveOutcome.Moved -> stringResource(R.string.event_move_done, movedLabel.orEmpty())
MoveOutcome.Undone -> stringResource(R.string.event_move_undone)
MoveOutcome.WriteDenied -> stringResource(R.string.event_move_write_denied)
MoveOutcome.Gone -> stringResource(R.string.event_move_gone)
MoveOutcome.BlockedSeriesEnd -> stringResource(R.string.event_move_blocked_series_end)
MoveOutcome.Failed -> stringResource(R.string.event_move_failed)
}
// Held past the outcome being consumed so the chip has something to draw
// while it springs back out. Updated in composition rather than from an
// effect, which would land a frame late and open the chip on stale text.
val shown = remember { mutableStateOf(ChipContent("", null)) }
if (message != null && (shown.value.message != message || shown.value.undo != moved?.undo)) {
shown.value = ChipContent(message, moved?.undo)
}
val content = shown.value
// Restarted by the undo tick and held while a write is in flight: an undo
// tapped in the last moments of the window leaves the outcome at Moved on
// purpose, and this timer would otherwise fire mid-undo and close the chip
// just before the same chip has to say "undone".
LaunchedEffect(outcome, undoTick, writeInFlight) {
if (outcome == null || writeInFlight) return@LaunchedEffect
delay(if (outcome == MoveOutcome.Undone) UNDONE_CHIP_MILLIS else CHIP_MILLIS)
viewModel.consumeOutcome()
}
BoxWithConstraints(modifier = modifier.fillMaxSize()) {
val chipMaxWidth = maxWidth - FAB_BAND
// A FAB-height band at the bottom start with the FAB's own margin, so
// the chip lines up beside the bottom-end FAB.
Box(
modifier = Modifier
.align(Alignment.BottomStart)
.navigationBarsPadding()
.padding(start = SnackChipMargin, bottom = SnackChipMargin)
.height(SnackChipHeight),
contentAlignment = Alignment.CenterStart,
) {
// The action goes away while a write runs: undo() refuses a second
// write anyway, so offering it would be a button that does nothing.
val undo = content.undo?.takeIf { !writeInFlight }
SnackChip(
visible = outcome != null,
message = content.message,
maxWidth = chipMaxWidth,
actionLabel = stringResource(R.string.event_move_undo).takeIf { undo != null },
onAction = undo?.let { { viewModel.undo(it) } },
)
}
}
}
/**
* "Fri, 7 Aug, 09:00" — the day, plus the time for a timed event. All-day events
* are read back on the UTC calendar day they are anchored to (#65, #82).
*/
private fun formatMovedTo(
startMillis: Long,
isAllDay: Boolean,
use24Hour: Boolean,
locale: Locale,
): String {
val zone: ZoneId = if (isAllDay) ZoneOffset.UTC else ZoneId.systemDefault()
val skeleton = when {
isAllDay -> "EEEdMMM"
use24Hour -> "EEEdMMMHm"
else -> "EEEdMMMhm"
}
return localizedDateFormatter(locale, skeleton)
.format(Instant.ofEpochMilli(startMillis).atZone(zone))
}

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@@ -0,0 +1,109 @@
package de.jeanlucmakiola.calendula.ui.common
import androidx.compose.animation.core.animateFloatAsState
import androidx.compose.runtime.Composable
import androidx.compose.runtime.Immutable
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.runtime.compositionLocalOf
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableIntStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.semantics.CustomAccessibilityAction
import androidx.lifecycle.compose.collectAsStateWithLifecycle
import de.jeanlucmakiola.calendula.R
import de.jeanlucmakiola.calendula.domain.EventInstance
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.flow.StateFlow
/**
* Drag-to-reschedule wiring (#68), provided once at `CalendarHost` and read by
* whichever event block is being composed. Null means moving is off entirely and
* blocks register no drag gesture at all.
*/
@Immutable
class EventMoveScope(
/**
* Calendars whose events may be moved. Nothing below the UI enforces this —
* the repository writes whatever it is handed — so this gate is load-bearing.
*/
val movableCalendarIds: Set<Long>,
/** False when the drop was refused outright, so nothing will be written. */
val move: (MoveRequest) -> Boolean,
/**
* True while a dropped event is being written, including the time its scope
* dialog is up. A flow rather than a value so this scope stays the same
* object across a move — every visible block reads it as a composition local.
*/
val inFlight: StateFlow<Boolean>,
/** Ticks when an undo write begins — see `RescheduleViewModel.undoStarted`. */
val undoStarted: StateFlow<Int>,
/** Open an event in the edit form — the pointer-free route to the same change. */
val edit: (EventInstance) -> Unit,
) {
fun allows(event: EventInstance): Boolean = event.calendarId in movableCalendarIds
}
val LocalEventMove = compositionLocalOf<EventMoveScope?> { null }
private val NEVER_IN_FLIGHT = MutableStateFlow(false)
private val NEVER_UNDONE = MutableStateFlow(0)
/**
* Whether a dropped event is still being written — false wherever moving is off.
* The drag overlays hold a landed block on its target for this window.
*/
@Composable
fun moveInFlight(): Boolean {
val flow = LocalEventMove.current?.inFlight ?: NEVER_IN_FLIGHT
return flow.collectAsStateWithLifecycle().value
}
/**
* Runs [onUndo] when an undo write begins, and never for one that began before
* this composable came on screen.
*/
@Composable
fun OnUndoStarted(onUndo: () -> Unit) {
val flow = LocalEventMove.current?.undoStarted ?: NEVER_UNDONE
val tick by flow.collectAsStateWithLifecycle()
var seen by remember { mutableIntStateOf(tick) }
LaunchedEffect(tick) {
if (tick == seen) return@LaunchedEffect
seen = tick
onUndo()
}
}
/** Opacity the source block keeps while its floating copy travels. */
const val GHOST_ALPHA: Float = 0.3f
/**
* Opacity for a block whose copy is in flight: ghosted from the lift until the
* copy is handed back, then animated up rather than switched, so the block
* appears to travel to its new slot instead of vanishing and reappearing.
*/
@Composable
fun ghostAlpha(lifted: Boolean): Float = animateFloatAsState(
targetValue = if (lifted) GHOST_ALPHA else 1f,
label = "ghost-alpha",
).value
/**
* A TalkBack action that opens [event] in the edit form, so rescheduling isn't
* pointer-only. Null when this event can't be moved.
*/
@Composable
fun eventMoveAction(event: EventInstance): CustomAccessibilityAction? {
val move = LocalEventMove.current ?: return null
if (!move.allows(event)) return null
val label = stringResource(R.string.event_move_action)
return remember(event.instanceId, label, move) {
CustomAccessibilityAction(label) {
move.edit(event)
true
}
}
}

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@@ -0,0 +1,119 @@
package de.jeanlucmakiola.calendula.ui.common
import androidx.compose.animation.core.animateFloatAsState
import androidx.compose.foundation.ScrollState
import androidx.compose.foundation.background
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.fillMaxHeight
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.shape.CircleShape
import androidx.compose.foundation.verticalScroll
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Text
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
import androidx.compose.ui.semantics.clearAndSetSemantics
import androidx.compose.ui.unit.Dp
import androidx.compose.ui.unit.dp
import de.jeanlucmakiola.floret.locale.currentLocale
/** Width of the hour gutter down the start edge of the day and week timelines. */
val GUTTER_WIDTH = 48.dp
/**
* Start inset for the gutter's content (week badge + hour labels) so it centres
* on the top bar's hamburger: with a 48dp gutter, 8dp lands the centre at 28dp,
* matching the icon button's centre.
*/
val GUTTER_CONTENT_START_INSET = 8.dp
private val BADGE_HEIGHT = 20.dp
/** How far the fixed hour labels recede while a block is being dragged. */
private const val DIMMED_HOUR_ALPHA = 0.3f
/**
* The timeline's hour gutter. Scrolls in sync with the day columns through the
* shared [scrollState], and while [dragController] holds a lifted block it dims
* the hour labels and floats a badge with the drag's current start time at the
* row the block would land on.
*/
@Composable
fun HourGutter(
scrollState: ScrollState,
hourHeight: Dp,
dragController: TimelineDragController,
modifier: Modifier = Modifier,
) {
val use24Hour = LocalUse24HourFormat.current
val locale = currentLocale()
// Derived: the drag is rewritten every frame, its snapped start once a slot.
val dragStartMin by remember(dragController) {
derivedStateOf { dragController.drag?.startMin }
}
val hourAlpha by animateFloatAsState(
targetValue = if (dragStartMin != null) DIMMED_HOUR_ALPHA else 1f,
label = "hourLabelAlpha",
)
Box(
modifier = modifier
.width(GUTTER_WIDTH)
.padding(start = GUTTER_CONTENT_START_INSET)
.fillMaxHeight()
.verticalScroll(scrollState),
) {
Column {
(0 until 24).forEach { h ->
Box(
modifier = Modifier
.fillMaxWidth()
.height(hourHeight),
) {
if (h > 0) {
Text(
text = formatHourLabel(h, use24Hour, locale),
style = MaterialTheme.typography.labelSmall,
color = MaterialTheme.colorScheme.onSurfaceVariant
.copy(alpha = hourAlpha),
modifier = Modifier
.align(Alignment.TopCenter)
.offset(y = (-6).dp),
)
}
}
}
}
dragStartMin?.let { startMin ->
val top = (hourHeight * (startMin / 60f) - BADGE_HEIGHT / 2).coerceAtLeast(0.dp)
Box(
modifier = Modifier
.align(Alignment.TopCenter)
.offset(y = top)
.height(BADGE_HEIGHT)
.background(MaterialTheme.colorScheme.primary, CircleShape)
.padding(horizontal = 4.dp)
// The dragged block already announces this time.
.clearAndSetSemantics { },
contentAlignment = Alignment.Center,
) {
Text(
text = formatGutterTime(startMin, use24Hour, locale),
style = MaterialTheme.typography.labelSmall,
color = MaterialTheme.colorScheme.onPrimary,
maxLines = 1,
softWrap = false,
)
}
}
}
}

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@@ -0,0 +1,69 @@
package de.jeanlucmakiola.calendula.ui.common
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.material3.AlertDialog
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Text
import androidx.compose.material3.TextButton
import androidx.compose.runtime.Composable
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.unit.dp
import de.jeanlucmakiola.calendula.R
import de.jeanlucmakiola.calendula.domain.RecurringWriteScope
import de.jeanlucmakiola.floret.components.OptionCard
/**
* How far a write to a recurring event should reach: this occurrence, it and
* everything after (a series split), or the whole series. Shared by the edit
* screen's save and a drag-and-drop reschedule; one of the two carve-outs from
* the full-screen picker rule.
*
* [allowOccurrence] drops "only this event" (an exception row can't carry its own
* rule); [allowSeries] drops the two wider options, for a rule whose days can't
* be recalculated from one moved occurrence — [reason] then says why.
*/
@Composable
fun RecurringScopeDialog(
title: String,
onSelect: (RecurringWriteScope) -> Unit,
onDismiss: () -> Unit,
allowOccurrence: Boolean = true,
allowSeries: Boolean = true,
reason: String? = null,
) {
AlertDialog(
onDismissRequest = onDismiss,
title = { Text(title) },
text = {
Column(verticalArrangement = Arrangement.spacedBy(8.dp)) {
if (reason != null) {
Text(
text = reason,
style = MaterialTheme.typography.bodyMedium,
color = MaterialTheme.colorScheme.onSurfaceVariant,
)
}
if (allowOccurrence) {
OptionCard(
label = stringResource(R.string.event_delete_option_occurrence),
onClick = { onSelect(RecurringWriteScope.ThisEvent) },
)
}
if (allowSeries) {
OptionCard(
label = stringResource(R.string.event_delete_option_following),
onClick = { onSelect(RecurringWriteScope.ThisAndFollowing) },
)
OptionCard(
label = stringResource(R.string.event_delete_option_series),
onClick = { onSelect(RecurringWriteScope.AllEvents) },
)
}
}
},
confirmButton = {
TextButton(onClick = onDismiss) { Text(stringResource(R.string.dialog_cancel)) }
},
)
}

View File

@@ -0,0 +1,463 @@
package de.jeanlucmakiola.calendula.ui.common
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.calendar.NoSuchEventException
import de.jeanlucmakiola.calendula.data.di.IoDispatcher
import de.jeanlucmakiola.calendula.domain.EventDetail
import de.jeanlucmakiola.calendula.domain.EventForm
import de.jeanlucmakiola.calendula.domain.EventFormProblem
import de.jeanlucmakiola.calendula.domain.RecurrenceEnd
import de.jeanlucmakiola.calendula.domain.RecurringWriteScope
import de.jeanlucmakiola.calendula.domain.allowsEventMove
import de.jeanlucmakiola.calendula.domain.parseSimpleRecurrence
import de.jeanlucmakiola.calendula.domain.problems
import de.jeanlucmakiola.calendula.domain.realignRecurrence
import de.jeanlucmakiola.calendula.domain.resolvedZone
import de.jeanlucmakiola.calendula.domain.shiftedByDays
import de.jeanlucmakiola.calendula.domain.shiftedTo
import de.jeanlucmakiola.calendula.domain.toEditForm
import kotlinx.coroutines.CoroutineDispatcher
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.flow.SharingStarted
import kotlinx.coroutines.flow.StateFlow
import kotlinx.coroutines.flow.asStateFlow
import kotlinx.coroutines.flow.catch
import kotlinx.coroutines.flow.flowOn
import kotlinx.coroutines.flow.map
import kotlinx.coroutines.flow.stateIn
import kotlinx.coroutines.launch
import kotlinx.datetime.DateTimeUnit
import kotlinx.datetime.LocalDate
import kotlinx.datetime.TimeZone
import kotlinx.datetime.atStartOfDayIn
import kotlinx.datetime.plus
import kotlinx.datetime.toInstant
import kotlinx.datetime.toLocalDateTime
import kotlin.coroutines.cancellation.CancellationException
import kotlin.time.Instant
import javax.inject.Inject
private const val MILLIS_PER_MINUTE = 60_000
private const val MINUTES_PER_DAY = 24 * 60
/** Where a dragged event should land. */
sealed interface MoveTarget {
/** A new start instant — a timeline drag, which moves time and day at once. */
data class Start(val instant: Instant) : MoveTarget
/**
* A whole-day shift, keeping the time of day — a month-grid or all-day drag.
* A delta rather than a target date, so the screen and this view model can't
* disagree by a day over which zone the event's first day is resolved in.
*/
data class ByDays(val days: Int) : MoveTarget
}
/**
* One dropped event. [beginMillis]/[endMillis] are the dragged *occurrence's*
* own times (`Instances.BEGIN`/`END`), as the detail and edit screens pass them.
*/
data class MoveRequest(
val eventId: Long,
val beginMillis: Long,
val endMillis: Long,
val target: MoveTarget,
)
/**
* A recurring drop waiting for the user to pick how far it reaches.
* [occurrenceOnly] means a wider write would leave the rule and the series
* anchor disagreeing — either the rule names days one moved occurrence can't
* re-derive (`BYDAY=MO,WE`, `2TH`, …), or the shift wouldn't carry the anchor
* across the same midnights the occurrence crossed.
*/
data class MoveScopePrompt(val occurrenceOnly: Boolean)
/** The inverse of a completed move, for the undo action. */
data class MoveUndo(
val eventId: Long,
/** The form as it now stands (the moved state). */
val moved: EventForm,
/** The form as it stood before the move. */
val restored: EventForm,
)
sealed interface MoveOutcome {
/**
* Written. [startMillis] is where the dragged occurrence now begins, for the
* confirmation message; [undo] is null when the write has no clean inverse.
*/
data class Moved(
val startMillis: Long,
val isAllDay: Boolean,
val undo: MoveUndo?,
) : MoveOutcome
data object Undone : MoveOutcome
/** `WRITE_CALENDAR` was revoked between the drop and the provider call. */
data object WriteDenied : MoveOutcome
/** The event vanished (sync, another device) between the read and the write. */
data object Gone : MoveOutcome
/** The drop would push the series past its own `UNTIL`, generating nothing. */
data object BlockedSeriesEnd : MoveOutcome
data object Failed : MoveOutcome
}
/**
* Writes a drag-and-drop reschedule (#68) through the same repository calls the
* edit screen's save uses, so recurring writes, reminder reconciliation and
* attendee preservation behave identically. Hosted at `CalendarHost` so one
* instance serves every calendar view and survives view switches. The full
* prefilled form is carried through the write — a stripped one would wipe the
* reminders and attendees the occurrence-exception path reconciles.
*/
@HiltViewModel
class RescheduleViewModel @Inject constructor(
private val repository: CalendarRepository,
@IoDispatcher private val io: CoroutineDispatcher,
) : ViewModel() {
private val _scopePrompt = MutableStateFlow<MoveScopePrompt?>(null)
val scopePrompt: StateFlow<MoveScopePrompt?> = _scopePrompt.asStateFlow()
private val _outcome = MutableStateFlow<MoveOutcome?>(null)
val outcome: StateFlow<MoveOutcome?> = _outcome.asStateFlow()
private var pending: PreparedMove? = null
private val _inFlight = MutableStateFlow(false)
/**
* True from the moment a drop is accepted until its write settles — the
* window the dropped block holds its landing position for.
*/
val inFlight: StateFlow<Boolean> = _inFlight.asStateFlow()
private val _undoStarted = MutableStateFlow(0)
/**
* Ticks the moment an undo write begins, before the provider has anything to
* re-read, so the view that drew the drop can carry its chip back rather than
* let it reappear on the old day.
*/
val undoStarted: StateFlow<Int> = _undoStarted.asStateFlow()
/**
* Set from the moment a drop is accepted until its write settles. Two drops
* of the same recurring event inside that window would compute their shift
* from the same pre-move occurrence, and the shifts would compound.
*/
private var busy = false
set(value) {
field = value
_inFlight.value = value
}
/**
* The calendars whose events may be dragged. Nothing below the UI guards
* this, so a block outside this set registers no drag gesture at all.
*/
val movableCalendarIds: StateFlow<Set<Long>> = repository.calendars()
.map { calendars -> calendars.filter { it.allowsEventMove }.map { it.id }.toSet() }
.catch { emit(emptySet<Long>()) }
.flowOn(io)
.stateIn(
scope = viewModelScope,
started = SharingStarted.WhileSubscribed(5_000L),
initialValue = emptySet(),
)
/** Everything a drop needs, resolved before anything is written. */
private data class PreparedMove(
val request: MoveRequest,
val original: EventForm,
val updated: EventForm,
/** True for a series master with a rule — an exception row is not one. */
val isRecurring: Boolean,
/** False when the rule names days this move can't re-derive. */
val canRealign: Boolean,
/** The series row's DTSTART date after the move — what its `UNTIL` must clear. */
val newAnchorDate: LocalDate,
)
/**
* Take a drop, unless one is already being written. False means nothing will
* be written and the caller must let its held copy go now — waiting on
* [inFlight] would strand it until the settle timeout instead.
*/
fun move(request: MoveRequest): Boolean {
if (busy || _scopePrompt.value != null) return false
busy = true
viewModelScope.launch {
val prepared = prepare(request)
if (prepared == null) {
busy = false
return@launch
}
if (!prepared.isRecurring) {
write(prepared, RecurringWriteScope.AllEvents)
busy = false
} else {
// Still busy: the scope dialog is now the thing in flight.
pending = prepared
_scopePrompt.value = MoveScopePrompt(occurrenceOnly = !prepared.canRealign)
}
}
return true
}
/** Answer the scope dialog. */
fun moveWithScope(scope: RecurringWriteScope) {
val prepared = pending ?: return
// Guard against the dialog ever offering a scope the rule can't carry.
if (!prepared.canRealign && scope != RecurringWriteScope.ThisEvent) return
pending = null
_scopePrompt.value = null
viewModelScope.launch {
write(prepared, scope)
busy = false
}
}
/** Dismiss the scope dialog without writing. */
fun cancelScope() {
pending = null
busy = false
_scopePrompt.value = null
}
/**
* Put a completed move back where it came from. The outcome stands until the
* inverse write reports back, so the one chip changes what it says rather
* than closing and reopening. False when another write is already running —
* the chip hides its action for that window, so this is the backstop.
*/
fun undo(undo: MoveUndo): Boolean {
if (busy) return false
busy = true
_undoStarted.value += 1
viewModelScope.launch {
_outcome.value = try {
repository.updateEvent(undo.eventId, undo.moved, undo.restored)
MoveOutcome.Undone
} catch (e: CancellationException) {
throw e
} catch (e: SecurityException) {
MoveOutcome.WriteDenied
} catch (e: NoSuchEventException) {
MoveOutcome.Gone
} catch (e: Exception) {
MoveOutcome.Failed
}
busy = false
}
return true
}
/** Clear the outcome once the screen has shown it. */
fun consumeOutcome() {
_outcome.value = null
}
private suspend fun prepare(request: MoveRequest): PreparedMove? {
val detail = try {
repository.eventDetail(request.eventId)
} catch (e: CancellationException) {
throw e
} catch (e: NoSuchEventException) {
_outcome.value = MoveOutcome.Gone
return null
} catch (e: Exception) {
_outcome.value = MoveOutcome.Failed
return null
}
val zone = TimeZone.currentSystemDefault()
val original = detail.toEditForm(request.beginMillis, request.endMillis, zone)
val shifted = when (val target = request.target) {
is MoveTarget.Start -> original.shiftedTo(target.instant, zone)
is MoveTarget.ByDays -> original.shiftedByDays(target.days, zone)
}
// A zero-distance drop is not a write.
if (shifted == original) return null
// The UNTIL check is deferred to the write, which knows how far the move
// reaches and so which date has to clear it.
if ((shifted.problems() - EventFormProblem.RecurrenceEndsBeforeStart).isNotEmpty()) {
_outcome.value = MoveOutcome.Failed
return null
}
// An exception row stands alone whatever rule a sync adapter left on it.
val isRecurring = original.rrule != null && !detail.isException
val movedDay = shifted.start.date != original.start.date
// The series anchor moves by the same *wall-clock* shift as the dragged
// occurrence, so only a whole-day shift carries it across the same number
// of midnights whatever time of day it sits at. A same-date drag has its
// own, narrower check — see anchorKeepsItsDay.
val wholeDayShift = original.isAllDay || shifted.start.time == original.start.time
val realigned = if (isRecurring && movedDay) {
if (wholeDayShift) {
realignRecurrence(
requireNotNull(original.rrule),
original.start.date,
shifted.start.date,
)
} else {
null
}
} else {
original.rrule
}
return PreparedMove(
request = request,
original = original,
// A rule we can't re-derive stays verbatim: the only scope offered
// then is the single occurrence, whose exception row carries no rule.
updated = shifted.copy(rrule = realigned ?: original.rrule),
isRecurring = isRecurring,
canRealign = when {
!isRecurring -> true
movedDay -> realigned != null
else -> anchorKeepsItsDay(detail, original, shifted, zone)
},
// Where the series row's own DTSTART lands, given the anchor moves by
// the same shift. Only read under canRealign, which is what
// guarantees the anchor really does travel this many days.
newAnchorDate = anchorDate(detail, original, zone)
.plus(shifted.start.date.toEpochDays() - original.start.date.toEpochDays(), DateTimeUnit.DAY),
)
}
private suspend fun write(prepared: PreparedMove, scope: RecurringWriteScope) {
val request = prepared.request
if (endsBeforeItStarts(prepared, scope)) {
_outcome.value = MoveOutcome.BlockedSeriesEnd
return
}
_outcome.value = try {
when {
!prepared.isRecurring || scope == RecurringWriteScope.AllEvents ->
repository.updateEvent(request.eventId, prepared.original, prepared.updated)
scope == RecurringWriteScope.ThisEvent ->
repository.updateOccurrence(
request.eventId,
request.beginMillis,
prepared.updated,
)
else -> repository.updateEventFromOccurrence(
eventId = request.eventId,
beginMillis = request.beginMillis,
original = prepared.original,
updated = prepared.updated,
)
}
MoveOutcome.Moved(
startMillis = movedStartMillis(prepared),
isAllDay = prepared.updated.isAllDay,
undo = undoFor(prepared, scope),
)
} catch (e: CancellationException) {
throw e
} catch (e: SecurityException) {
MoveOutcome.WriteDenied
} catch (e: NoSuchEventException) {
MoveOutcome.Gone
} catch (e: Exception) {
MoveOutcome.Failed
}
}
/**
* Whether this write would leave a rule whose `UNTIL` precedes the first day
* it now applies to — the provider then generates nothing at all. Which date
* has to clear `UNTIL` depends on the scope: a whole-series move carries the
* series *anchor*, a split starts at the moved occurrence, and a single
* occurrence becomes an exception row that no `UNTIL` constrains.
*/
private fun endsBeforeItStarts(prepared: PreparedMove, scope: RecurringWriteScope): Boolean {
if (!prepared.isRecurring || scope == RecurringWriteScope.ThisEvent) return false
val rule = prepared.updated.rrule ?: return false
val end = parseSimpleRecurrence(rule)?.end as? RecurrenceEnd.Until ?: return false
val firstDay = if (scope == RecurringWriteScope.AllEvents) {
prepared.newAnchorDate
} else {
prepared.updated.start.date
}
return end.date < firstDay
}
/**
* Whether a same-date drag leaves the series anchor on its own day too. The
* anchor moves by the same wall-clock delta as the occurrence, and normally
* shares its time of day — but a row with no `EVENT_TIMEZONE` resolves the
* two in zones that can sit a DST hour apart, so a near-midnight drag could
* carry the anchor across a midnight the occurrence never crossed and leave
* `BYDAY` naming the wrong weekday.
*/
private fun anchorKeepsItsDay(
detail: EventDetail,
original: EventForm,
shifted: EventForm,
zone: TimeZone,
): Boolean {
val anchorZone = if (original.isAllDay) TimeZone.UTC else original.resolvedZone(zone)
val anchorMinute = detail.instance.start.toLocalDateTime(anchorZone)
.time.toMillisecondOfDay() / MILLIS_PER_MINUTE
val delta = (
shifted.start.time.toMillisecondOfDay() - original.start.time.toMillisecondOfDay()
) / MILLIS_PER_MINUTE
return anchorMinute + delta in 0 until MINUTES_PER_DAY
}
/**
* The series row's own start date — for a recurring master, `EventDetail`
* carries the row's DTSTART rather than the tapped occurrence's. Read in the
* same anchoring the write path uses: UTC for an all-day series.
*/
private fun anchorDate(detail: EventDetail, original: EventForm, zone: TimeZone): LocalDate =
detail.instance.start
.toLocalDateTime(if (original.isAllDay) TimeZone.UTC else original.resolvedZone(zone))
.date
/**
* Undo is offered only where the inverse is one symmetric write: a
* non-recurring event, and a whole-series move. "This event" leaves an
* exception row behind and "this and following" splits the series with an
* UNTIL truncation — neither is undone by shifting back.
*/
private fun undoFor(prepared: PreparedMove, scope: RecurringWriteScope): MoveUndo? =
if (!prepared.isRecurring || scope == RecurringWriteScope.AllEvents) {
MoveUndo(
eventId = prepared.request.eventId,
moved = prepared.updated,
restored = prepared.original,
)
} else {
null
}
/**
* Where the dragged occurrence now begins, in the same anchoring the views
* read dates back in: UTC midnight for an all-day event.
*/
private fun movedStartMillis(prepared: PreparedMove): Long {
val form = prepared.updated
return if (form.isAllDay) {
form.start.date.atStartOfDayIn(TimeZone.UTC).toEpochMilliseconds()
} else {
form.start.toInstant(form.resolvedZone(TimeZone.currentSystemDefault()))
.toEpochMilliseconds()
}
}
}

View File

@@ -17,6 +17,7 @@ val LocalUse24HourFormat = staticCompositionLocalOf { true }
private const val PATTERN_24 = "HH:mm"
private const val PATTERN_12 = "h:mm a"
private const val HOUR_PATTERN_12 = "h a"
private const val HOUR_MINUTE_PATTERN_12 = "h:mm"
/** A time-of-day [DateTimeFormatter] for the resolved convention and [locale]. */
fun timeOfDayFormatter(is24Hour: Boolean, locale: Locale): DateTimeFormatter =
@@ -42,6 +43,18 @@ fun formatMinuteOfDay(minutes: Int, is24Hour: Boolean, locale: Locale): String =
else -> formatTimeOfDay(minutes / 60, minutes % 60, is24Hour, locale)
}
/**
* The time shown in the timeline gutter while a block is dragged: 24h →
* "09:15", 12h → "9:15". The meridiem is dropped — the hour labels around it
* already carry it, and the gutter is too narrow.
*/
fun formatGutterTime(minutes: Int, is24Hour: Boolean, locale: Locale): String {
val clamped = minutes.coerceIn(0, MINUTES_PER_DAY - 1)
val pattern = if (is24Hour) PATTERN_24 else HOUR_MINUTE_PATTERN_12
return LocalTime.of(clamped / 60, clamped % 60)
.format(DateTimeFormatter.ofPattern(pattern, locale))
}
/**
* The compact hour-only label for a timeline gutter: 24h → "13" (zero-padded,
* the prior look); 12h → "1 PM".

View File

@@ -0,0 +1,484 @@
package de.jeanlucmakiola.calendula.ui.common
import androidx.compose.animation.core.animateFloatAsState
import androidx.compose.animation.core.tween
import androidx.compose.foundation.ScrollState
import androidx.compose.foundation.MutatePriority
import androidx.compose.foundation.background
import androidx.compose.foundation.isSystemInDarkTheme
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.absoluteOffset
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.size
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.runtime.Stable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.runtime.withFrameNanos
import androidx.compose.ui.Modifier
import androidx.compose.ui.geometry.Offset
import androidx.compose.ui.graphics.graphicsLayer
import androidx.compose.ui.layout.LayoutCoordinates
import androidx.compose.ui.layout.boundsInRoot
import androidx.compose.ui.semantics.clearAndSetSemantics
import androidx.compose.ui.layout.onGloballyPositioned
import androidx.compose.ui.layout.positionInRoot
import androidx.compose.ui.platform.LocalDensity
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.text.style.TextOverflow
import androidx.compose.ui.unit.IntOffset
import androidx.compose.ui.unit.IntSize
import androidx.compose.ui.unit.dp
import de.jeanlucmakiola.calendula.R
import de.jeanlucmakiola.calendula.domain.EventInstance
import de.jeanlucmakiola.calendula.ui.week.MINUTES_PER_DAY
import de.jeanlucmakiola.calendula.ui.week.TimedBlock
import de.jeanlucmakiola.floret.identity.rememberReduceMotion
import de.jeanlucmakiola.floret.locale.currentLocale
import kotlinx.coroutines.delay
import kotlinx.datetime.LocalDate
import kotlinx.datetime.LocalDateTime
import kotlinx.datetime.LocalTime
import kotlinx.datetime.TimeZone
import kotlinx.datetime.toInstant
import kotlinx.datetime.toLocalDateTime
import kotlin.math.roundToInt
import kotlin.time.Instant
/** Start granularity a dragged block snaps to, matching the big calendar apps. */
const val DRAG_SNAP_MINUTES: Int = 15
/** How close to a timeline edge the finger must get before the view scrolls. */
private val AUTO_SCROLL_EDGE = 64.dp
/** Fastest auto-scroll step, per frame, right at the edge. */
private val AUTO_SCROLL_STEP = 16.dp
/** A block being dragged, in root coordinates so it can be drawn in an overlay. */
data class TimelineDrag(
val event: EventInstance,
val date: LocalDate,
val startMin: Int,
val endMin: Int,
val topLeftInRoot: Offset,
val sizePx: IntSize,
) {
/** What the snap haptics key off: one tick per changed slot, not per frame. */
val slot: Pair<LocalDate, Int> get() = date to startMin
}
/** Where a finished drag asks its event to go. */
data class TimelineDrop(val event: EventInstance, val date: LocalDate, val startMin: Int)
/**
* The timeline's live geometry, republished on every layout. Plain fields rather
* than snapshot state: it changes on every scroll frame, and the drag loop reads
* it per frame anyway.
*/
class TimelineGeometry {
/** The day-columns row — scrolling *content*, so its root position folds in the scroll. */
var grid: LayoutCoordinates? = null
/** The scroll viewport, for the edge that triggers auto-scrolling. */
var viewport: LayoutCoordinates? = null
var scroll: ScrollState? = null
var hourPx: Float = 0f
/** Column pitch — one column plus the gap after it. */
var columnWidthPx: Float = 0f
var columnGapPx: Float = 0f
var edgePx: Float = 0f
var stepPx: Float = 0f
var days: List<LocalDate> = emptyList()
/**
* Whether the columns are laid out right-to-left. Pointer coordinates are
* never mirrored but the grid is, so the mapping has to flip with it.
*/
var isRtl: Boolean = false
}
/**
* Hoisted drag state for one timeline (#68). It lives above the per-page
* `AnimatedContent`, so a 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
class TimelineDragController {
val geometry = TimelineGeometry()
var drag: TimelineDrag? by mutableStateOf(null)
private set
/**
* A dropped block, held at the slot it landed on while the write runs — the
* grid behind it still shows the old time until the query re-reads.
*/
var settling: TimelineDrag? by mutableStateOf(null)
private set
/**
* Which block is lifted, and whether anything is. Separate snapshot state
* from [drag], which changes every frame, so blocks that only need "am I the
* ghost" don't recompose that often. Stays set through [settling].
*/
var liftedInstanceId: Long? by mutableStateOf(null)
private set
/**
* Where the settled drop came from, and which event row it belongs to. The
* instance id alone can't identify the source block for the length of the
* write: the provider regenerates `Instances` rows, so a re-read carrying the
* *old* time can arrive under a new instance id.
*/
private var settledOrigin: Triple<Long, LocalDate, Int>? by mutableStateOf(null)
/** Whether a finger is on a block right now — [settling] is not dragging. */
var isDragging: Boolean by mutableStateOf(false)
private set
/**
* Whether the grid itself now draws the settled drop at its landing slot.
* The copy may only be handed back once this is true, or the source ghost
* flashes back to full opacity in its old slot.
*/
var settledOnGrid: Boolean by mutableStateOf(false)
private set
private var source: TimedBlock? = null
private var grab = Offset.Zero
private var pointer = Offset.Zero
/**
* The slot the block already occupied when it was picked up — not the same
* as its start, since the target snaps to the grid (09:07 lifts to 09:00).
*/
private var originSlot: Pair<LocalDate, Int>? = null
fun begin(block: TimedBlock, pointerInRoot: Offset, blockInRoot: Offset) {
source = block
settling = null
isDragging = true
liftedInstanceId = block.event.instanceId
grab = pointerInRoot - blockInRoot
pointer = pointerInRoot
originSlot = null
recompute()
originSlot = drag?.slot
}
fun move(pointerInRoot: Offset) {
pointer = pointerInRoot
recompute()
}
fun cancel() {
source = null
isDragging = false
liftedInstanceId = null
originSlot = null
drag = null
settling = null
settledOnGrid = false
settledOrigin = null
}
/**
* Whether [block] is the one whose copy is in flight, and so must stay a
* ghost: the instance the finger picked up, or once dropped whatever now
* sits in the slot it left.
*/
fun ghosts(block: TimedBlock, date: LocalDate): Boolean {
if (liftedInstanceId == null) return false
if (block.event.instanceId == liftedInstanceId) return true
val (eventId, originDate, originMin) = settledOrigin ?: return false
return block.event.eventId == eventId &&
date == originDate &&
block.startMin == originMin
}
/**
* What a day column now holds, so a settled drop can tell when the grid has
* caught up with it. Matched on the landing slot plus either the event row
* or its title, since a single-occurrence move writes a new `eventId`.
*/
fun noteGrid(date: LocalDate, blocks: List<TimedBlock>) {
val landed = settling ?: return
if (settledOnGrid || landed.date != date) return
settledOnGrid = blocks.any { block ->
block.startMin == landed.startMin &&
(
block.event.eventId == landed.event.eventId ||
block.event.title == landed.event.title
)
}
}
/**
* End the drag, handing back where it landed — null when it never resolved,
* or when it landed back on the slot it started from. A real drop keeps its
* copy on the target as [settling] until [release].
*/
fun finish(): TimelineDrop? {
val landed = drag
val origin = originSlot
cancel()
if (landed == null || landed.slot == origin) return null
settling = landed
liftedInstanceId = landed.event.instanceId
settledOrigin = origin?.let { (date, min) -> Triple(landed.event.eventId, date, min) }
return TimelineDrop(landed.event, landed.date, landed.startMin)
}
/**
* Stop ghosting the source — the grid draws the drop itself by now — while
* the copy is still dissolving. Un-ghosting at [release] instead would leave
* the block dim under the fading copy and then brighten it: a visible dip.
*/
fun handOver() {
liftedInstanceId = null
settledOrigin = null
}
/** Drop the copy, once it has faded into the grid's own block. */
fun release() {
settling = null
settledOnGrid = false
handOver()
}
/**
* Re-derive the target from the pointer's *root* position. Recomputed rather
* than accumulated from `positionChange()`, because a stationary finger emits
* no move events while auto-scroll walks the content underneath it.
*/
fun recompute() {
val block = source ?: return
val grid = geometry.grid?.takeIf { it.isAttached } ?: return
val hourPx = geometry.hourPx
val columnPx = geometry.columnWidthPx
val days = geometry.days
if (hourPx <= 0f || columnPx <= 0f || days.isEmpty()) return
val origin = grid.positionInRoot()
val rawMinutes = (pointer.y - grab.y - origin.y) / hourPx * 60f
val snapped = (rawMinutes / DRAG_SNAP_MINUTES).roundToInt() * DRAG_SNAP_MINUTES
// Clamp the start into the target day; a tail past midnight is fine.
val startMin = snapped.coerceIn(0, MINUTES_PER_DAY - DRAG_SNAP_MINUTES)
// The event's own length, not the block's: TimedBlock.endMin is clipped
// at midnight, which would draw a 22:0002:00 event as a two-hour copy.
val span = (block.event.end - block.event.start).inWholeMinutes.toInt().coerceAtLeast(0)
// The column the finger is over on screen, and the day that column shows.
val column = ((pointer.x - origin.x) / columnPx).toInt().coerceIn(0, days.lastIndex)
val dayIndex = if (geometry.isRtl) days.lastIndex - column else column
val height = maxOf(span / 60f * hourPx, MIN_EVENT_FRACTION * hourPx)
drag = TimelineDrag(
event = block.event,
date = days[dayIndex],
startMin = startMin,
endMin = startMin + span,
topLeftInRoot = Offset(
x = origin.x + column * columnPx,
y = origin.y + startMin / 60f * hourPx,
),
sizePx = IntSize(
(columnPx - geometry.columnGapPx).roundToInt(),
height.roundToInt(),
),
)
}
/**
* Hold the scroll for the whole drag and nudge it once per frame while the
* finger sits near an edge. One `scroll` call, since a loop of
* `animateScrollBy` would re-acquire the mutex and cancel the last.
*/
suspend fun autoScroll() {
val scroll = geometry.scroll ?: return
scroll.scroll(MutatePriority.UserInput) {
while (true) {
withFrameNanos { }
recompute()
val step = edgeStep()
if (step != 0f) scrollBy(step)
}
}
}
private fun edgeStep(): Float {
val viewport = geometry.viewport?.takeIf { it.isAttached } ?: return 0f
val edge = geometry.edgePx
if (edge <= 0f) return 0f
val bounds = viewport.boundsInRoot()
val fromTop = pointer.y - bounds.top
val fromBottom = bounds.bottom - pointer.y
return when {
fromTop < edge -> -(edge - fromTop) / edge * geometry.stepPx
fromBottom < edge -> (edge - fromBottom) / edge * geometry.stepPx
else -> 0f
}
}
}
@Composable
fun rememberTimelineDragController(): TimelineDragController {
val controller = remember { TimelineDragController() }
val density = LocalDensity.current
controller.geometry.edgePx = with(density) { AUTO_SCROLL_EDGE.toPx() }
controller.geometry.stepPx = with(density) { AUTO_SCROLL_STEP.toPx() }
return controller
}
/**
* True when [block] actually begins on [day] rather than being the tail of an
* event that started earlier. A clipped block's top edge is midnight, not the
* event's start, so dragging it would move the event to a time it never had.
*/
fun TimedBlock.beginsOn(day: LocalDate, zone: TimeZone): Boolean =
event.start.toLocalDateTime(zone).date == day
/**
* The instant a drop asks for, read in the zone the timeline is drawn in. A drop
* into a spring-forward gap has no instant of its own; `toInstant` resolves it
* forward by the missing hour, and the block visibly settles there.
*/
fun TimelineDrop.startInstant(zone: TimeZone): Instant =
LocalDateTime(date, LocalTime(startMin / 60, startMin % 60)).toInstant(zone)
/**
* A beat after the grid draws the drop, so its own block is under way before the
* copy starts dissolving.
*/
const val SETTLE_GRACE_MILLIS: Long = 60L
/**
* How long to wait for a grid that never confirms the drop — it landed on a day
* this timeline doesn't show, or the write failed. The copy has to go either way.
*/
private const val SETTLE_TIMEOUT_MILLIS = 900L
/**
* The hand-over: the copy dissolves over this while the grid's own block slides
* in under it. Kept short, because a full-width copy sits over any neighbour it
* now shares a lane with until it is gone.
*/
const val SETTLE_FADE_MILLIS: Int = 250
/**
* The floating block, drawn over the whole calendar so it is free of the day
* column's clip and of the scroll viewport's rounded corners.
*/
@Composable
fun TimelineDragOverlay(controller: TimelineDragController, modifier: Modifier = Modifier) {
var origin by remember { mutableStateOf(Offset.Zero) }
val dark = isSystemInDarkTheme()
val soften = LocalSoftenColors.current
val use24Hour = LocalUse24HourFormat.current
val locale = currentLocale()
val reduceMotion = rememberReduceMotion()
val density = LocalDensity.current
val moveInFlight = moveInFlight()
// Both live here rather than beside the controller: they read [drag], which
// changes every frame, and this composable is the one that is meant to.
DragSnapHaptics(controller.drag?.slot)
LaunchedEffect(controller.isDragging) {
if (controller.isDragging) controller.autoScroll()
}
// Hold the landed copy until the write is done — including the time a
// recurring drop's scope dialog is up — and then until the grid draws the
// drop itself.
var handingOver by remember(controller.settling) { mutableStateOf(false) }
LaunchedEffect(controller.settling, moveInFlight, controller.settledOnGrid) {
if (controller.settling == null || moveInFlight) return@LaunchedEffect
delay(if (controller.settledOnGrid) SETTLE_GRACE_MILLIS else SETTLE_TIMEOUT_MILLIS)
handingOver = true
controller.handOver()
delay(SETTLE_FADE_MILLIS.toLong())
controller.release()
}
Box(
modifier = modifier
.fillMaxSize()
// A copy of a block still in the tree behind it; announcing it again
// would duplicate the event for the drag's duration.
.clearAndSetSemantics { }
.onGloballyPositioned { origin = it.positionInRoot() },
) {
val drag = controller.drag ?: controller.settling ?: return@Box
// Landed: the copy sinks back to the grid's own plane while the write runs.
val landed = controller.drag == null
val lift by animateFloatAsState(
targetValue = if (landed || reduceMotion) 0f else 1f,
label = "drag-lift",
)
val copyAlpha by animateFloatAsState(
targetValue = if (handingOver) 0f else 1f,
animationSpec = tween(SETTLE_FADE_MILLIS),
label = "drag-handover",
)
val fill = eventFill(drag.event.color, dark, soften)
val title = drag.event.title.ifBlank { stringResource(R.string.event_untitled) }
// An end past midnight wraps rather than saturating, so a four-hour
// event dragged to 22:00 reads "22:0002:00" and not "22:0024:00".
val endMin = if (drag.endMin > MINUTES_PER_DAY) {
drag.endMin % MINUTES_PER_DAY
} else {
drag.endMin
}
val label = "${formatMinuteOfDay(drag.startMin, use24Hour, locale)}" +
formatMinuteOfDay(endMin, use24Hour, locale)
Box(
modifier = Modifier
// Absolute: these are root coordinates, and the direction-aware
// offset would mirror them across the screen in an RTL layout.
.absoluteOffset {
IntOffset(
(drag.topLeftInRoot.x - origin.x).roundToInt(),
(drag.topLeftInRoot.y - origin.y).roundToInt(),
)
}
.size(
width = with(density) { drag.sizePx.width.toDp() },
height = with(density) { drag.sizePx.height.toDp() },
)
.padding(horizontal = 1.dp)
.graphicsLayer {
scaleX = 1f + 0.02f * lift
scaleY = 1f + 0.02f * lift
shadowElevation = 8.dp.toPx() * lift
alpha = copyAlpha
shape = RoundedCornerShape(4.dp)
clip = false
}
.background(fill, RoundedCornerShape(4.dp))
.padding(horizontal = 4.dp, vertical = 2.dp),
) {
Column {
Text(
text = title,
style = MaterialTheme.typography.labelMedium,
maxLines = 1,
overflow = TextOverflow.Ellipsis,
color = eventInk(fill, alpha = 0.85f),
)
Text(
text = label,
style = MaterialTheme.typography.labelSmall,
maxLines = 1,
overflow = TextOverflow.Ellipsis,
color = eventInk(fill, alpha = SECONDARY_INK_ALPHA),
)
}
}
}
}

View File

@@ -41,7 +41,14 @@ class TimelineZoom(
var scale: TimelineScale by mutableStateOf(initial)
private set
private var pinching = false
/**
* Whether fingers are rescaling the timeline right now. Snapshot state, so
* anything that tweens off [scale] can stand down for the gesture: the
* height changes every pointer frame, and a spring would spend the whole
* pinch chasing a target that has already moved.
*/
var isPinching: Boolean by mutableStateOf(false)
private set
/**
* Take a value that came from the preference. Ignored mid-pinch: the stored
@@ -49,11 +56,11 @@ class TimelineZoom(
* snap the timeline back while the user is still pinching.
*/
fun adopt(stored: TimelineScale) {
if (!pinching) scale = stored
if (!isPinching) scale = stored
}
fun beginPinch() {
pinching = true
isPinching = true
}
fun pinchTo(hourHeight: Dp) {
@@ -61,7 +68,7 @@ class TimelineZoom(
}
fun endPinch() {
pinching = false
isPinching = false
persist(scale)
}
}

View File

@@ -42,6 +42,7 @@ import androidx.compose.material3.rememberDrawerState
import androidx.compose.runtime.Composable
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
@@ -53,14 +54,19 @@ import androidx.compose.ui.draw.clip
import androidx.compose.ui.draw.clipToBounds
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.RectangleShape
import androidx.compose.ui.draw.alpha
import androidx.compose.ui.input.nestedscroll.nestedScroll
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.text.style.TextOverflow
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
@@ -74,7 +80,21 @@ 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.BlockTimeLabel
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.beginsOn
import de.jeanlucmakiola.calendula.ui.common.eventMoveAction
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
@@ -93,8 +113,9 @@ import de.jeanlucmakiola.calendula.ui.common.MIN_EVENT_FRACTION
import de.jeanlucmakiola.calendula.ui.common.SECONDARY_INK_ALPHA
import de.jeanlucmakiola.calendula.ui.common.hourHeight
import de.jeanlucmakiola.calendula.ui.common.rememberTimelinePinchZoom
import de.jeanlucmakiola.calendula.ui.common.formatHourLabel
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.hourSeparatorLines
import de.jeanlucmakiola.calendula.ui.week.TimedBlock
import kotlinx.coroutines.flow.first
@@ -106,11 +127,6 @@ import kotlin.time.Clock
import java.util.Locale
import kotlin.math.roundToInt
private val GUTTER_WIDTH = 48.dp
/** Start inset for the gutter's hour labels so they centre on the top bar's
* hamburger: with a 48dp gutter, 8dp lands the centre at 28dp (the app bar's
* 4dp inset + 24dp half icon button), matching the week view. */
private val GUTTER_CONTENT_START_INSET = 8.dp
private val ALL_DAY_ROW_HEIGHT = 24.dp
private val ALL_DAY_VERTICAL_PADDING = 6.dp
@@ -298,31 +314,54 @@ private fun DayContent(
// drag is consumed by the inner scroll first — the two gestures coexist.
val swipeModifier = rememberCalendarPageSwipe(onSwipeNext, onSwipePrev)
AnimatedContent(
targetState = state,
modifier = modifier.then(swipeModifier),
contentKey = { s ->
// 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) {
is DayUiState.Success -> "success-${s.date}"
is DayUiState.Failure -> "failure-${s.reason}"
DayUiState.Loading -> "loading"
DayUiState.Loading -> DayLoading()
is DayUiState.Failure -> CalendarFailure(reason = s.reason, onRetry = onRetry)
is DayUiState.Success -> DaySuccess(
state = s,
topSectionColor = topSectionColor,
scrollState = scrollState,
allDayHeight = allDayHeight,
dragController = dragController,
onEventClick = onEventClick,
onCreateAt = onCreateAt,
onDrop = { drop ->
val took = move?.move(
MoveRequest(
eventId = drop.event.eventId,
beginMillis = drop.event.start.toEpochMilliseconds(),
endMillis = drop.event.end.toEpochMilliseconds(),
target = MoveTarget.Start(drop.startInstant(zone)),
),
)
// Refused, so nothing will land: let the copy go now
// rather than hold it out for a settle that never comes.
if (took != true) dragController.release()
},
)
}
},
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,
topSectionColor = topSectionColor,
scrollState = scrollState,
allDayHeight = allDayHeight,
onEventClick = onEventClick,
onCreateAt = onCreateAt,
)
}
TimelineDragOverlay(dragController)
}
}
@@ -332,8 +371,10 @@ private fun DaySuccess(
topSectionColor: Color,
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,
@@ -352,8 +393,10 @@ private fun DaySuccess(
Timeline(
state = state,
scrollState = scrollState,
dragController = dragController,
onEventClick = onEventClick,
onCreateAt = onCreateAt,
onDrop = onDrop,
)
}
}
@@ -487,13 +530,15 @@ private fun AllDayBar(
private fun Timeline(
state: DayUiState.Success,
scrollState: ScrollState,
dragController: TimelineDragController,
onEventClick: (EventInstance) -> Unit,
onCreateAt: (LocalDate, Int) -> Unit,
onDrop: (TimelineDrop) -> Unit,
) {
val dark = isSystemInDarkTheme()
val use24Hour = LocalUse24HourFormat.current
val locale = currentLocale()
val zoom = LocalTimelineZoom.current
val density = LocalDensity.current
val isRtl = LocalLayoutDirection.current == LayoutDirection.Rtl
// 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
@@ -512,39 +557,19 @@ private fun Timeline(
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.
Column(
modifier = Modifier
.width(GUTTER_WIDTH)
.padding(start = GUTTER_CONTENT_START_INSET)
.fillMaxHeight()
.verticalScroll(scrollState),
) {
(0 until 24).forEach { h ->
Box(
modifier = Modifier
.fillMaxWidth()
.height(hourHeight),
) {
if (h > 0) {
Text(
text = formatHourLabel(h, use24Hour, locale),
style = MaterialTheme.typography.labelSmall,
color = MaterialTheme.colorScheme.onSurfaceVariant,
modifier = Modifier
.align(Alignment.TopCenter)
.offset(y = (-6).dp),
)
}
}
}
}
HourGutter(
scrollState = scrollState,
hourHeight = hourHeight,
dragController = dragController,
)
// Day column: rounded, clipped scroll viewport (permanent corners).
Box(
modifier = Modifier
.weight(1f)
.fillMaxHeight()
.clip(RoundedCornerShape(16.dp))
.verticalScroll(scrollState),
.verticalScroll(scrollState)
.onGloballyPositioned { dragController.geometry.viewport = it },
) {
DayColumnCard(
blocks = state.timed,
@@ -552,11 +577,26 @@ private fun Timeline(
date = state.date,
today = state.today,
hourHeight = hourHeight,
dragController = dragController,
onEventClick = onEventClick,
onCreateAt = onCreateAt,
onDrop = onDrop,
modifier = Modifier
.fillMaxWidth()
.height(totalHeight),
.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.columnGapPx = 0f
it.columnWidthPx = coords.size.width.toFloat()
it.days = listOf(state.date)
it.isRtl = isRtl
}
},
)
}
}
@@ -570,13 +610,19 @@ private fun DayColumnCard(
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 showHourLines = LocalShowHourLines.current
val hourLineColor = MaterialTheme.colorScheme.outlineVariant
// Tells a settled drop when this column has caught up with it.
LaunchedEffect(blocks, dragController.settling) {
dragController.noteGrid(date, blocks)
}
Card(
// Plain rectangular column — the soft corners come from the outer
// rounded scroll viewport, so inner rounding would look odd at the edges.
@@ -604,22 +650,38 @@ private fun DayColumnCard(
) {
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 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
EventBlock(
block = block,
dark = dark,
height = height,
onClick = { onEventClick(block.event) },
modifier = Modifier
.offset(x = laneWidth * block.lane, y = top)
.width(laneWidth)
.height(height)
.padding(horizontal = 1.dp),
)
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,
)
EventBlock(
block = block,
dark = dark,
height = place.height,
date = date,
dragController = dragController,
onClick = { onEventClick(block.event) },
onDrop = onDrop,
modifier = Modifier
.offset(x = place.x, y = place.y)
.width(place.width)
.height(place.height)
.padding(horizontal = 1.dp),
)
}
}
// Current-time line, on top of the events, only on today's column.
if (date == today) {
@@ -634,7 +696,10 @@ private fun EventBlock(
block: TimedBlock,
dark: Boolean,
height: Dp,
date: LocalDate,
dragController: TimelineDragController,
onClick: () -> Unit,
onDrop: (TimelineDrop) -> Unit,
modifier: Modifier = Modifier,
) {
val title = block.event.title.ifBlank { stringResource(R.string.event_untitled) }
@@ -658,12 +723,35 @@ private fun EventBlock(
val showTitle = available >= titleLineHeight
val soften = LocalSoftenColors.current
val fill = eventFill(block.event.color, dark, soften)
val zone = remember { TimeZone.currentSystemDefault() }
val moveAction = eventMoveAction(block.event)
// A block clipped at the top continues from the previous day: its top edge
// is midnight, not the event's start, so dragging it would invent a time.
val draggable = moveAction != null && block.beginsOn(date, zone)
val dragModifier = rememberEventDragSource(
enabled = draggable,
key = block.event.instanceId,
onPickUp = { pointer, blockRoot, _ -> dragController.begin(block, pointer, blockRoot) },
onMove = dragController::move,
onDrop = { dragController.finish()?.let(onDrop) },
onCancel = dragController::cancel,
)
val lifted = draggable && dragController.ghosts(block, date)
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)
.background(fill, RoundedCornerShape(4.dp))
.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 = 4.dp, vertical = 2.dp)
.semantics { contentDescription = "$title, $timeLabel" },
.semantics {
contentDescription = "$title, $timeLabel"
if (moveAction != null) customActions = listOf(moveAction)
},
) {
Column {
if (showTitle) {
@@ -676,11 +764,8 @@ private fun EventBlock(
)
}
if (showTime) {
Text(
text = timeLabel,
style = MaterialTheme.typography.labelSmall,
maxLines = 1,
overflow = TextOverflow.Ellipsis,
BlockTimeLabel(
label = timeLabel,
color = eventInk(fill, alpha = SECONDARY_INK_ALPHA),
)
}

View File

@@ -127,6 +127,7 @@ import de.jeanlucmakiola.floret.identity.collapseExit
import de.jeanlucmakiola.floret.identity.expandEnter
import de.jeanlucmakiola.floret.identity.predictiveBack
import de.jeanlucmakiola.calendula.data.calendar.CalendarColorPalette
import de.jeanlucmakiola.calendula.ui.common.RecurringScopeDialog
import de.jeanlucmakiola.calendula.ui.common.CalendarPickerGroups
import de.jeanlucmakiola.calendula.ui.common.CalendarDatePickerDialog
import de.jeanlucmakiola.calendula.ui.common.ColorSwatchRow
@@ -452,30 +453,11 @@ private fun SaveScopeDialog(
onSelect: (RecurringWriteScope) -> Unit,
onDismiss: () -> Unit,
) {
AlertDialog(
onDismissRequest = onDismiss,
title = { Text(stringResource(R.string.event_edit_recurring_title)) },
text = {
Column(verticalArrangement = Arrangement.spacedBy(8.dp)) {
if (!recurrenceChanged) {
OptionCard(
label = stringResource(R.string.event_delete_option_occurrence),
onClick = { onSelect(RecurringWriteScope.ThisEvent) },
)
}
OptionCard(
label = stringResource(R.string.event_delete_option_following),
onClick = { onSelect(RecurringWriteScope.ThisAndFollowing) },
)
OptionCard(
label = stringResource(R.string.event_delete_option_series),
onClick = { onSelect(RecurringWriteScope.AllEvents) },
)
}
},
confirmButton = {
TextButton(onClick = onDismiss) { Text(stringResource(R.string.dialog_cancel)) }
},
RecurringScopeDialog(
title = stringResource(R.string.event_edit_recurring_title),
onSelect = onSelect,
onDismiss = onDismiss,
allowOccurrence = !recurrenceChanged,
)
}

View File

@@ -0,0 +1,303 @@
package de.jeanlucmakiola.calendula.ui.month
import androidx.compose.runtime.Composable
import androidx.compose.runtime.Stable
import androidx.compose.runtime.compositionLocalOf
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.geometry.Offset
import androidx.compose.ui.layout.LayoutCoordinates
import androidx.compose.ui.layout.boundsInRoot
import androidx.compose.ui.layout.positionInRoot
import androidx.compose.ui.unit.IntSize
import de.jeanlucmakiola.calendula.domain.EventInstance
import kotlinx.datetime.LocalDate
import kotlin.math.abs
/** One week row's live geometry, republished on every layout while it is on screen. */
class MonthRowGeometry(
val days: List<LocalDate>,
/** The row's day-column box — the space chip offsets are measured in. */
val cell: LayoutCoordinates,
/** The lane band inside that box, where the chips themselves are seated. */
val band: LayoutCoordinates?,
val columnWidthPx: Float,
val laneHeightPx: Float,
val laneCount: Int,
/**
* Whether the columns are laid out right-to-left. Pointer coordinates are
* never mirrored but the grid is, so the mapping has to flip with it.
*/
val isRtl: Boolean,
/** What this row currently draws in [lane] of column `col`, or null. */
val chipAt: (col: Int, lane: Int) -> EventInstance?,
) {
/** Root top-left of the chip seated in [lane] of column [col]. */
fun seat(col: Int, lane: Int): Offset? {
val band = band?.takeIf { it.isAttached } ?: return null
val origin = band.positionInRoot()
val column = if (isRtl) days.lastIndex - col else col
return Offset(origin.x + column * columnWidthPx, origin.y + lane * laneHeightPx)
}
/**
* Where this row seats [event] on [date], or null when it doesn't hold it —
* the day isn't in this week, or the chip went into the day's "+N" overflow.
*/
fun seatOf(event: EventInstance, date: LocalDate): Offset? {
val col = days.indexOf(date).takeIf { it >= 0 } ?: return null
val lane = (0 until laneCount).firstOrNull { lane ->
chipAt(col, lane)?.let { isSameEvent(it, event) } == true
} ?: return null
return seat(col, lane)
}
}
/**
* Whether [chip] is the moved event [moved] as the grid now holds it. Neither id
* alone will do: re-read instances get new instance ids, and a single-occurrence
* move writes a new event id — the title survives both.
*/
private fun isSameEvent(chip: EventInstance, moved: EventInstance): Boolean =
chip.eventId == moved.eventId || chip.title == moved.title
/** A chip in flight, in root coordinates so it can be drawn in an overlay. */
data class MonthChipDrag(
val event: EventInstance,
/** The day whose column the chip was grabbed in — the drag is a delta from it. */
val grabDate: LocalDate,
val targetDate: LocalDate?,
val topLeftInRoot: Offset,
val sizePx: IntSize,
)
/** Where a finished chip drag asks its event to go, as a whole-day shift. */
data class MonthChipDrop(
val event: EventInstance,
val grabDate: LocalDate,
val targetDate: LocalDate,
)
/**
* Hoisted drag state for the month grid (#68). Every visible week row registers
* itself so a chip can be carried across rows, the target resolved against
* whichever registered row the finger is over. Rows are keyed by an identity
* token rather than a date: the continuous style can show the same week twice.
*/
@Stable
class MonthDragController {
private val rows = LinkedHashMap<Any, MonthRowGeometry>()
var drag: MonthChipDrag? by mutableStateOf(null)
private set
/**
* A dropped chip, held on the day it landed on while the write runs — the
* grid behind it still shows the old day until the query re-reads.
*/
var settling: MonthChipDrag? by mutableStateOf(null)
private set
/**
* Which chip is lifted, and whether anything is. Separate snapshot state from
* [drag], which changes every frame, so the chips and rows that only need
* "am I the ghost" don't recompose that often. Stays set through [settling].
*/
var liftedInstanceId: Long? by mutableStateOf(null)
private set
/**
* Where the grid itself now draws the drop, in root coordinates — published
* by whichever week row ends up holding it. The copy is dropped wherever the
* finger was while the grid seats it in a lane, so without this it would
* cross-fade across the gap instead of gliding onto its seat.
*/
var settledInRoot: Offset? by mutableStateOf(null)
private set
/**
* Whether the drop's own chip is still standing in for the copy. Cleared at
* [handOver] rather than [release], or the chip stays dim under a copy that
* has already faded and brightens afterwards: a visible dip.
*/
private var settledGhost: Boolean by mutableStateOf(false)
/** Whether a finger is on a chip right now — [settling] is not dragging. */
var isDragging: Boolean by mutableStateOf(false)
private set
/**
* The last drop this controller made, kept past [release] for [beginUndo] —
* the confirmation chip carries Undo long after the copy is gone.
*/
private var undoable: MonthChipDrag? = null
private var event: EventInstance? = null
private var grabDate: LocalDate? = null
private var grab = Offset.Zero
private var pointer = Offset.Zero
private var sizePx = IntSize.Zero
fun putRow(token: Any, geometry: MonthRowGeometry) {
rows[token] = geometry
}
fun removeRow(token: Any) {
rows.remove(token)
}
fun begin(
event: EventInstance,
grabDate: LocalDate,
pointerInRoot: Offset,
chipInRoot: Offset,
size: IntSize,
) {
this.event = event
this.grabDate = grabDate
settling = null
isDragging = true
liftedInstanceId = event.instanceId
grab = pointerInRoot - chipInRoot
pointer = pointerInRoot
sizePx = size
recompute()
}
fun move(pointerInRoot: Offset) {
pointer = pointerInRoot
recompute()
}
fun cancel() {
event = null
grabDate = null
isDragging = false
liftedInstanceId = null
drag = null
settling = null
settledInRoot = null
settledGhost = false
}
/**
* Whether [days] holds the chip the grid has drawn for the settled drop —
* the seat the copy is on its way to, which must ghost until it gets there.
*/
fun isSettledChip(event: EventInstance, days: List<LocalDate>?): Boolean {
val landed = settling?.takeIf { settledGhost } ?: return false
if (days == null || landed.targetDate !in days) return false
return isSameEvent(event, landed.event)
}
/**
* Ask the row keyed [token] whether it now seats the settled chip. Both
* copies of a week the continuous style shows twice will answer; the seat
* nearest where the chip was let go is the one the finger was over.
*/
fun noteSettled(token: Any) {
val landed = settling ?: return
val target = landed.targetDate ?: return
val at = rows[token]?.seatOf(landed.event, target) ?: return
val current = settledInRoot
val closer = current == null ||
abs(at.y - landed.topLeftInRoot.y) < abs(current.y - landed.topLeftInRoot.y)
if (closer) settledInRoot = at
}
/**
* Put a chip on the journey an undo's inverse write is about to make, so it
* travels back rather than teleporting. Writes nothing itself. False when
* there is no drop of this controller's left to undo, or the grid doesn't
* seat the moved event where the chip would have to start from.
*/
fun beginUndo(): Boolean {
val last = undoable ?: return false
undoable = null
val from = last.targetDate ?: return false
val at = rows.values.firstNotNullOfOrNull { it.seatOf(last.event, from) } ?: return false
settling = last.copy(grabDate = from, targetDate = last.grabDate, topLeftInRoot = at)
liftedInstanceId = last.event.instanceId
settledGhost = true
settledInRoot = null
return true
}
/**
* End the drag, handing back where it landed — null when it never resolved,
* or when it landed back on the day it came from. A real drop keeps its chip
* on the target day as [settling] until [release], slid over to that day's
* column so it lands where the grid is about to draw it.
*/
fun finish(): MonthChipDrop? {
val landed = drag
val left = landed?.targetDate?.let(::columnLeft)
cancel()
val target = landed?.targetDate?.takeIf { it != landed.grabDate } ?: return null
settling = landed.copy(
topLeftInRoot = Offset(left ?: landed.topLeftInRoot.x, landed.topLeftInRoot.y),
)
liftedInstanceId = landed.event.instanceId
settledGhost = true
undoable = settling
return MonthChipDrop(landed.event, landed.grabDate, target)
}
/**
* Stop ghosting the source while the copy is still dissolving — un-ghosting
* at [release] instead leaves the chip dim and then brightens it.
*/
fun handOver() {
liftedInstanceId = null
settledGhost = false
}
/** Drop the copy, once it has faded into the grid's own chip. */
fun release() {
settling = null
settledInRoot = null
handOver()
}
/** Root x of [date]'s column, in whichever visible row shows that day. */
private fun columnLeft(date: LocalDate): Float? = rows.values.firstNotNullOfOrNull { row ->
val index = row.days.indexOf(date).takeIf { it >= 0 } ?: return@firstNotNullOfOrNull null
val bounds = row.cell.takeIf { it.isAttached }?.boundsInRoot()
?: return@firstNotNullOfOrNull null
val column = if (row.isRtl) row.days.lastIndex - index else index
bounds.left + column * row.columnWidthPx
}
private fun recompute() {
val event = event ?: return
val grabbed = grabDate ?: return
val resolved = rows.values.firstNotNullOfOrNull { row ->
val bounds = row.cell.takeIf { it.isAttached }?.boundsInRoot()
?: return@firstNotNullOfOrNull null
if (!bounds.contains(pointer) || row.columnWidthPx <= 0f) {
null
} else {
val column = ((pointer.x - bounds.left) / row.columnWidthPx)
.toInt()
.coerceIn(0, row.days.lastIndex)
row.days[if (row.isRtl) row.days.lastIndex - column else column]
}
}
drag = MonthChipDrag(
event = event,
grabDate = grabbed,
// Off the grid entirely: keep the last cell it was over, so a
// wobble past the edge doesn't drop the target.
targetDate = resolved ?: drag?.targetDate,
topLeftInRoot = pointer - grab,
sizePx = sizePx,
)
}
}
@Composable
fun rememberMonthDragController(): MonthDragController = remember { MonthDragController() }
val LocalMonthDrag = compositionLocalOf<MonthDragController?> { null }

View File

@@ -4,7 +4,9 @@ import androidx.activity.compose.BackHandler
import androidx.compose.animation.AnimatedContent
import androidx.compose.animation.ExperimentalSharedTransitionApi
import androidx.compose.animation.SharedTransitionLayout
import androidx.compose.animation.core.Animatable
import androidx.compose.animation.core.RepeatMode
import androidx.compose.animation.core.VectorConverter
import androidx.compose.animation.core.animateFloatAsState
import androidx.compose.animation.core.snap
import androidx.compose.animation.core.animateFloat
@@ -59,9 +61,11 @@ import androidx.compose.material3.TopAppBarDefaults
import androidx.compose.material3.rememberDrawerState
import androidx.compose.runtime.Composable
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.runtime.SideEffect
import androidx.compose.runtime.CompositionLocalProvider
import androidx.compose.runtime.derivedStateOf
import androidx.compose.runtime.getValue
import androidx.compose.runtime.DisposableEffect
import androidx.compose.runtime.key
import androidx.compose.runtime.snapshotFlow
import androidx.compose.runtime.mutableIntStateOf
@@ -77,7 +81,32 @@ import androidx.compose.ui.draw.clip
import androidx.compose.ui.draw.clipToBounds
import androidx.compose.ui.draw.drawBehind
import androidx.compose.ui.geometry.CornerRadius
import androidx.compose.foundation.layout.absoluteOffset
import androidx.compose.ui.platform.LocalLayoutDirection
import androidx.compose.ui.semantics.clearAndSetSemantics
import androidx.compose.ui.unit.LayoutDirection
import androidx.compose.ui.geometry.Offset
import kotlin.math.roundToInt
import de.jeanlucmakiola.calendula.ui.common.rememberDragSurface
import de.jeanlucmakiola.calendula.ui.common.eventMoveAction
import de.jeanlucmakiola.calendula.ui.common.MoveTarget
import de.jeanlucmakiola.calendula.ui.common.MoveRequest
import de.jeanlucmakiola.calendula.ui.common.LocalEventMove
import de.jeanlucmakiola.calendula.ui.common.moveInFlight
import de.jeanlucmakiola.calendula.ui.common.OnUndoStarted
import de.jeanlucmakiola.calendula.ui.common.ghostAlpha
import de.jeanlucmakiola.calendula.ui.common.DragSnapHaptics
import de.jeanlucmakiola.calendula.ui.common.SETTLE_FADE_MILLIS
import de.jeanlucmakiola.calendula.ui.common.SETTLE_GRACE_MILLIS
import de.jeanlucmakiola.calendula.ui.common.EventMoveScope
import de.jeanlucmakiola.calendula.domain.spanFirstDay
import androidx.compose.ui.unit.IntSize
import androidx.compose.ui.unit.IntOffset
import androidx.compose.ui.semantics.customActions
import androidx.compose.ui.layout.positionInRoot
import androidx.compose.ui.layout.onGloballyPositioned
import androidx.compose.ui.layout.LayoutCoordinates
import androidx.compose.ui.graphics.graphicsLayer
import androidx.compose.ui.geometry.Size
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.drawscope.Stroke
@@ -126,6 +155,7 @@ import de.jeanlucmakiola.floret.locale.currentLocale
import de.jeanlucmakiola.calendula.ui.common.rememberCalendarSlideSpec
import de.jeanlucmakiola.calendula.ui.common.next
import de.jeanlucmakiola.floret.time.isoWeekNumber
import kotlinx.coroutines.delay
import kotlinx.coroutines.flow.distinctUntilChanged
import kotlinx.coroutines.flow.filterNotNull
import kotlinx.coroutines.launch
@@ -384,13 +414,23 @@ fun MonthScreen(
)
},
) { innerPadding ->
Column(
// Hoisted above every style's grid: a dragged chip is drawn in an
// overlay, clear of the week row's and the list viewport's clips.
val chipDrag = rememberMonthDragController()
// Undo moves the event back, so the chip travels back too. The
// signal comes from the write, not from the chip that offers it.
OnUndoStarted { chipDrag.beginUndo() }
Box(
modifier = Modifier
.padding(innerPadding)
.fillMaxSize(),
) {
Column(modifier = Modifier.fillMaxSize()) {
WeekdayHeader(weekStart = weekStart, showWeekNumbers = showWeekNumbers)
CompositionLocalProvider(LocalDimCutoff provides dimCutoff) {
CompositionLocalProvider(
LocalDimCutoff provides dimCutoff,
LocalMonthDrag provides chipDrag,
) {
if (scrolling) {
ContinuousMonthContent(
state = continuousState,
@@ -427,10 +467,103 @@ fun MonthScreen(
}
}
}
MonthDragOverlay(chipDrag)
}
}
}
}
/**
* How long to wait for a grid that never seats the drop — it landed in a day's
* "+N" overflow or on a day this month doesn't show, or the write failed.
*/
private const val MONTH_SETTLE_TIMEOUT_MILLIS = 450L
/** The chip in flight, drawn over the grid and following the finger. */
@Composable
private fun MonthDragOverlay(controller: MonthDragController) {
var origin by remember { mutableStateOf(Offset.Zero) }
val dark = isSystemInDarkTheme()
val density = LocalDensity.current
val reduceMotion = rememberReduceMotion()
val moveInFlight = moveInFlight()
// Here rather than beside the controller: this reads [drag], which changes
// every frame, and this composable is the one that is meant to.
DragSnapHaptics(controller.drag?.targetDate)
// Hold the landed chip until the write is done — including the time a
// recurring drop's scope dialog is up — and then, unlike the timeline, carry
// it to its seat: it was dropped at whatever height the finger was at, while
// the grid seats it in a lane.
var handingOver by remember(controller.settling) { mutableStateOf(false) }
var gliding by remember(controller.settling) { mutableStateOf(false) }
val glide = remember { Animatable(Offset.Zero, Offset.VectorConverter) }
val glideSpec = MaterialTheme.motionScheme.fastSpatialSpec<Offset>()
val seat = controller.settledInRoot
LaunchedEffect(controller.settling, moveInFlight, seat) {
val landed = controller.settling
if (landed == null || moveInFlight) return@LaunchedEffect
if (seat == null) {
delay(MONTH_SETTLE_TIMEOUT_MILLIS)
} else {
if (!gliding) glide.snapTo(landed.topLeftInRoot)
gliding = true
if (reduceMotion) glide.snapTo(seat) else glide.animateTo(seat, glideSpec)
delay(SETTLE_GRACE_MILLIS)
}
handingOver = true
controller.handOver()
delay(SETTLE_FADE_MILLIS.toLong())
controller.release()
}
Box(
modifier = Modifier
.fillMaxSize()
// A copy of a chip still in the tree behind it; announcing it again
// would duplicate the event for the drag's duration.
.clearAndSetSemantics { }
.onGloballyPositioned { origin = it.positionInRoot() },
) {
val drag = controller.drag ?: controller.settling ?: return@Box
// Landed: the copy sinks back to the grid's own plane while the write runs.
val lift by animateFloatAsState(
targetValue = if (controller.drag == null || reduceMotion) 0f else 1f,
label = "chip-lift",
)
val copyAlpha by animateFloatAsState(
targetValue = if (handingOver) 0f else 1f,
animationSpec = tween(SETTLE_FADE_MILLIS),
label = "chip-handover",
)
MonthBar(
event = drag.event,
dark = dark,
continuesLeft = false,
continuesRight = false,
modifier = Modifier
// Absolute: these are root coordinates, and the direction-aware
// offset would mirror them across the screen in an RTL layout.
.absoluteOffset {
val at = if (gliding) glide.value else drag.topLeftInRoot
IntOffset(
(at.x - origin.x).roundToInt(),
(at.y - origin.y).roundToInt(),
)
}
.width(with(density) { drag.sizePx.width.toDp() })
.height(with(density) { drag.sizePx.height.toDp() })
.padding(horizontal = CELL_GAP + 1.dp, vertical = 1.dp)
.graphicsLayer {
scaleX = 1f + 0.04f * lift
scaleY = 1f + 0.04f * lift
shadowElevation = 8.dp.toPx() * lift
alpha = copyAlpha
shape = RoundedCornerShape(4.dp)
clip = false
},
)
}
}
@Composable
private fun MonthContent(
state: MonthUiState,
@@ -1720,6 +1853,50 @@ private fun MonthWeekRow(
val shownLanes = laneCount.coerceAtMost(MAX_EVENT_ROWS)
val morphing = morphInFlight()
// Drag to reschedule (#68). The chips can take no pointer input of their own
// — the full-bleed tap layer sits on top of them — so one detector on the
// row's day-column box hit-tests them geometrically instead.
val moveScope = LocalEventMove.current
val dragController = LocalMonthDrag.current
val rowToken = remember { Any() }
val bandCoordinates = remember { arrayOfNulls<LayoutCoordinates>(1) }
val cellCoordinates = remember { arrayOfNulls<LayoutCoordinates>(1) }
val density = LocalDensity.current
val rowHeightPx = with(density) { EVENT_ROW_HEIGHT.toPx() }
val isRtl = LocalLayoutDirection.current == LayoutDirection.Rtl
val dragging = dragController?.isDragging == true
DisposableEffect(rowToken, dragController) {
onDispose { dragController?.removeRow(rowToken) }
}
// Republished on layout *and* on every recomposition: the coordinates change
// only on the former, but what the row draws — which the controller reads to
// find a moved chip's seat — changes on the latter.
val publish = {
val cell = cellCoordinates[0]?.takeIf { it.isAttached }
if (dragController != null && cell != null) {
dragController.putRow(
rowToken,
MonthRowGeometry(
days = week.days,
cell = cell,
band = bandCoordinates[0],
columnWidthPx = cell.size.width / 7f,
laneHeightPx = rowHeightPx,
laneCount = MAX_EVENT_ROWS,
isRtl = isRtl,
chipAt = { col, lane -> week.chipAt(col, lane, MAX_EVENT_ROWS) },
),
)
}
}
SideEffect { publish() }
// Once the grid holds the settled chip, tell the controller where this row
// has seated it, so the copy in flight can glide onto it. Keyed on the week,
// which is what changes when the re-read lands.
LaunchedEffect(week, dragController?.settling) {
dragController?.noteSettled(rowToken)
}
Row(modifier) {
// Optional calendar-week gutter, sized so the seven day columns below
// divide the remaining width — the absolute bar offsets stay correct
@@ -1735,7 +1912,21 @@ private fun MonthWeekRow(
BoxWithConstraints(
Modifier
.weight(1f)
.fillMaxHeight(),
.fillMaxHeight()
.onGloballyPositioned { coords ->
cellCoordinates[0] = coords
publish()
}
.then(
monthChipDragModifier(
week = week,
moveScope = moveScope,
controller = dragController,
band = bandCoordinates,
rowHeightPx = rowHeightPx,
isRtl = isRtl,
),
),
) {
val colW = maxWidth / 7
@@ -1800,7 +1991,13 @@ private fun MonthWeekRow(
modifier = Modifier
.fillMaxWidth()
.weight(1f)
.then(if (morphing) Modifier else Modifier.clipToBounds()),
.onGloballyPositioned {
bandCoordinates[0] = it
publish()
}
// A dragged chip travels to another row, so the clip
// yields for it as it does for a morph.
.then(if (morphing || dragging) Modifier else Modifier.clipToBounds()),
) {
// Spanning bars on their shared lanes.
week.spans.filter { it.lane < shownLanes }.forEach { span ->
@@ -1810,6 +2007,7 @@ private fun MonthWeekRow(
dark = dark,
continuesLeft = span.continuesLeft,
continuesRight = span.continuesRight,
days = week.days.subList(span.startCol, span.endCol + 1),
modifier = Modifier
.offset(
x = colW * span.startCol,
@@ -1879,6 +2077,7 @@ private fun MonthWeekRow(
dark = dark,
continuesLeft = false,
continuesRight = false,
days = listOf(d),
modifier = Modifier
.offset(
x = colW * col,
@@ -1959,6 +2158,73 @@ private fun MonthWeekRow(
}
}
/**
* The row-level pickup for month chips: resolves which chip the press landed on
* from the geometry the row just laid out, and abandons the gesture on empty
* space (or an unmovable calendar) so tapping a day still opens it.
*/
@Composable
private fun monthChipDragModifier(
week: MonthWeek,
moveScope: EventMoveScope?,
controller: MonthDragController?,
band: Array<LayoutCoordinates?>,
rowHeightPx: Float,
isRtl: Boolean,
): Modifier = rememberDragSurface(
enabled = moveScope != null && controller != null,
key = week.days.first(),
onPickUp = { local, pointerInRoot, nodeInRoot, size ->
val bandTop = band[0]?.takeIf { it.isAttached }?.positionInRoot()?.y
val columnPx = size.width / 7f
val bandY = if (bandTop == null) -1f else local.y - (bandTop - nodeInRoot.y)
val lane = (bandY / rowHeightPx).toInt()
// The column under the finger on screen, and the day that column shows.
val column = (local.x / columnPx).toInt()
val dayIndex = if (isRtl) week.days.lastIndex - column else column
val event = if (bandY < 0f || columnPx <= 0f) {
null
} else {
week.chipAt(dayIndex, lane, MAX_EVENT_ROWS)
}
if (event == null || moveScope?.allows(event) != true) {
false
} else {
controller?.begin(
event = event,
grabDate = week.days[dayIndex],
pointerInRoot = pointerInRoot,
chipInRoot = Offset(
x = nodeInRoot.x + column * columnPx,
y = requireNotNull(bandTop) + lane * rowHeightPx,
),
size = IntSize(columnPx.toInt(), rowHeightPx.toInt()),
)
true
}
},
onMove = { controller?.move(it) },
onDrop = {
controller?.finish()?.let { drop ->
// How many columns the finger crossed — grabbing the middle of a
// multi-day bar shifts by what it travelled, not to where it landed.
val delta = (drop.targetDate.toEpochDays() - drop.grabDate.toEpochDays()).toInt()
val took = moveScope?.move(
MoveRequest(
eventId = drop.event.eventId,
beginMillis = drop.event.start.toEpochMilliseconds(),
endMillis = drop.event.end.toEpochMilliseconds(),
target = MoveTarget.ByDays(delta),
),
)
// Refused, so nothing will land: let the copy go now rather than
// hold the chip out for a settle that can never arrive.
if (took != true) controller?.release()
}
},
onCancel = { controller?.cancel() },
)
/**
* Left-gutter calendar-week cell (#25): a full-height tonal pill mirroring the
* day cells' geometry, set apart by the secondaryContainer tint (matching the
@@ -2051,12 +2317,24 @@ private fun MonthBar(
continuesLeft: Boolean,
continuesRight: Boolean,
modifier: Modifier = Modifier,
/**
* The days this chip covers in its row, for the drag (#68). A drop's own chip
* has to ghost until the copy lands on it, and the instance id can't find it:
* the provider hands the re-read instance a new one.
*/
days: List<LocalDate>? = null,
) {
val title = event.title.ifBlank { stringResource(R.string.event_untitled) }
val dimCutoff = LocalDimCutoff.current
val dimmed = dimCutoff != null && event.hasEnded(dimCutoff)
val soften = LocalSoftenColors.current
val fill = eventFill(event.color, dark, soften)
val moveAction = eventMoveAction(event)
// The source stays put as a ghost while its floating copy travels.
val monthDrag = LocalMonthDrag.current
val lifted = monthDrag?.liftedInstanceId == event.instanceId ||
monthDrag?.isSettledChip(event, days) == true
val ghost = ghostAlpha(lifted)
val shape = RoundedCornerShape(
topStart = if (continuesLeft) 0.dp else 4.dp,
bottomStart = if (continuesLeft) 0.dp else 4.dp,
@@ -2065,9 +2343,13 @@ private fun MonthBar(
)
Box(
modifier = (if (dimmed) modifier.alpha(EventDimAlpha) else modifier)
.then(if (ghost < 1f) Modifier.alpha(ghost) else Modifier)
.background(fill, shape)
.padding(horizontal = 4.dp)
.semantics { contentDescription = title },
.semantics {
contentDescription = title
if (moveAction != null) customActions = listOf(moveAction)
},
contentAlignment = Alignment.CenterStart,
) {
Text(

View File

@@ -67,6 +67,23 @@ fun MonthWeek.laneEvents(col: Int, day: LocalDate, laneCap: Int): List<EventInst
return byLane.filterNotNull()
}
/**
* The event drawn in lane [lane] of column [col], or null for an empty slot.
* Unlike [laneEvents] the lanes are *not* compacted — this answers "what is under
* this point", so an empty lane above a seated bar has to stay empty (#68).
*/
fun MonthWeek.chipAt(col: Int, lane: Int, laneCap: Int): EventInstance? {
if (col !in days.indices || lane !in 0 until laneCap) return null
spans.firstOrNull { it.lane == lane && col in it.startCol..it.endCol }?.let { return it.event }
val occupied = spans
.filter { it.lane < laneCap && col in it.startCol..it.endCol }
.map { it.lane }
.toSet()
val free = (0 until laneCap).filter { it !in occupied }
val index = free.indexOf(lane).takeIf { it >= 0 } ?: return null
return timedByDay[days[col]].orEmpty().take(free.size).getOrNull(index)
}
/**
* The events on [day] that [laneEvents] had no lane left for — its exact
* complement, in the same bars-then-pills order. Returned as events rather than

View File

@@ -47,6 +47,7 @@ import androidx.compose.runtime.Composable
import androidx.compose.runtime.CompositionLocalProvider
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.runtime.derivedStateOf
import androidx.compose.runtime.key
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableIntStateOf
import androidx.compose.runtime.remember
@@ -62,13 +63,17 @@ import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.RectangleShape
import androidx.compose.ui.input.nestedscroll.nestedScroll
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.text.font.FontWeight
import androidx.compose.ui.text.style.TextOverflow
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
@@ -84,6 +89,20 @@ 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.EventDimAlpha
import de.jeanlucmakiola.calendula.ui.common.BlockTimeLabel
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.TimelineDragController
import de.jeanlucmakiola.calendula.ui.common.TimelineDragOverlay
import de.jeanlucmakiola.calendula.ui.common.TimelineDrop
import de.jeanlucmakiola.calendula.ui.common.beginsOn
import de.jeanlucmakiola.calendula.ui.common.eventMoveAction
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.LocalDimCutoff
import de.jeanlucmakiola.calendula.ui.common.LocalSoftenColors
import de.jeanlucmakiola.calendula.ui.common.eventFill
@@ -104,8 +123,10 @@ import de.jeanlucmakiola.calendula.ui.common.MIN_TITLE_WRAP_WIDTH
import de.jeanlucmakiola.calendula.ui.common.SECONDARY_INK_ALPHA
import de.jeanlucmakiola.calendula.ui.common.hourHeight
import de.jeanlucmakiola.calendula.ui.common.rememberTimelinePinchZoom
import de.jeanlucmakiola.calendula.ui.common.formatHourLabel
import de.jeanlucmakiola.calendula.ui.common.formatMinuteOfDay
import de.jeanlucmakiola.calendula.ui.common.GUTTER_CONTENT_START_INSET
import de.jeanlucmakiola.calendula.ui.common.GUTTER_WIDTH
import de.jeanlucmakiola.calendula.ui.common.HourGutter
import de.jeanlucmakiola.calendula.ui.common.hourSeparatorLines
import de.jeanlucmakiola.calendula.ui.common.rememberCalendarSlideSpec
import de.jeanlucmakiola.calendula.ui.common.next
@@ -121,13 +142,10 @@ import kotlin.time.Clock
import java.time.format.TextStyle as JavaTextStyle
import java.util.Locale
private val GUTTER_WIDTH = 48.dp
/** Start inset for the gutter's content (week badge + hour labels) so it centres
* on the top bar's hamburger: with a 48dp gutter, 8dp lands the centre at 28dp
* (the app bar's 4dp inset + 24dp half icon button). */
private val GUTTER_CONTENT_START_INSET = 8.dp
private val ALL_DAY_ROW_HEIGHT = 24.dp
private val ALL_DAY_VERTICAL_PADDING = 6.dp
/** Gap between day columns; part of the column pitch a drag maps positions through. */
private val COLUMN_GAP = 2.dp
/** Total all-day strip height for a week (0 when there are no all-day events). */
private fun WeekUiState.Success.allDayStripHeight(): Dp {
@@ -331,32 +349,55 @@ private fun WeekContent(
// gestures coexist without fighting.
val swipeModifier = rememberCalendarPageSwipe(onSwipeNext, onSwipePrev)
AnimatedContent(
targetState = state,
modifier = modifier.then(swipeModifier),
contentKey = { s ->
// 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 WeekUiState.Success -> "success-${s.weekStart}"
is WeekUiState.Failure -> "failure-${s.reason}"
WeekUiState.Loading -> "loading"
}
},
transitionSpec = { calendarSlideTransition(slideDir, slideSpec, fadeSpec, reduceMotion) },
label = "week-transition",
) { s ->
when (s) {
is WeekUiState.Success -> "success-${s.weekStart}"
is WeekUiState.Failure -> "failure-${s.reason}"
WeekUiState.Loading -> "loading"
WeekUiState.Loading -> WeekLoading()
is WeekUiState.Failure -> CalendarFailure(reason = s.reason, onRetry = onRetry)
is WeekUiState.Success -> WeekSuccess(
state = s,
topSectionColor = topSectionColor,
scrollState = scrollState,
allDayHeight = allDayHeight,
dragController = dragController,
onEventClick = onEventClick,
onOpenDay = onOpenDay,
onCreateAt = onCreateAt,
onDrop = { drop ->
val took = move?.move(
MoveRequest(
eventId = drop.event.eventId,
beginMillis = drop.event.start.toEpochMilliseconds(),
endMillis = drop.event.end.toEpochMilliseconds(),
target = MoveTarget.Start(drop.startInstant(zone)),
),
)
// Refused, so nothing will land: let the copy go now
// rather than hold it out for a settle that never comes.
if (took != true) dragController.release()
},
)
}
},
transitionSpec = { calendarSlideTransition(slideDir, slideSpec, fadeSpec, reduceMotion) },
label = "week-transition",
) { s ->
when (s) {
WeekUiState.Loading -> WeekLoading()
is WeekUiState.Failure -> CalendarFailure(reason = s.reason, onRetry = onRetry)
is WeekUiState.Success -> WeekSuccess(
state = s,
topSectionColor = topSectionColor,
scrollState = scrollState,
allDayHeight = allDayHeight,
onEventClick = onEventClick,
onOpenDay = onOpenDay,
onCreateAt = onCreateAt,
)
}
TimelineDragOverlay(dragController)
}
}
@@ -366,9 +407,11 @@ private fun WeekSuccess(
topSectionColor: Color,
scrollState: ScrollState,
allDayHeight: Dp,
dragController: TimelineDragController,
onEventClick: (EventInstance) -> Unit,
onOpenDay: (LocalDate) -> Unit,
onCreateAt: (LocalDate, Int) -> Unit,
onDrop: (TimelineDrop) -> Unit,
) {
Column(modifier = Modifier.fillMaxSize()) {
Column(
@@ -385,8 +428,10 @@ private fun WeekSuccess(
Timeline(
state = state,
scrollState = scrollState,
dragController = dragController,
onEventClick = onEventClick,
onCreateAt = onCreateAt,
onDrop = onDrop,
)
}
}
@@ -622,13 +667,15 @@ private fun AllDayBar(
private fun Timeline(
state: WeekUiState.Success,
scrollState: ScrollState,
dragController: TimelineDragController,
onEventClick: (EventInstance) -> Unit,
onCreateAt: (LocalDate, Int) -> Unit,
onDrop: (TimelineDrop) -> Unit,
) {
val dark = isSystemInDarkTheme()
val use24Hour = LocalUse24HourFormat.current
val locale = currentLocale()
val zoom = LocalTimelineZoom.current
val density = LocalDensity.current
val isRtl = LocalLayoutDirection.current == LayoutDirection.Rtl
// 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
@@ -648,45 +695,39 @@ private fun Timeline(
Row(modifier = Modifier.fillMaxSize().then(pinch)) {
// Hour gutter (scrolls in sync with the day columns). Same start inset
// as the header badge so the labels sit under it and on the hamburger.
Column(
modifier = Modifier
.width(GUTTER_WIDTH)
.padding(start = GUTTER_CONTENT_START_INSET)
.fillMaxHeight()
.verticalScroll(scrollState),
) {
(0 until 24).forEach { h ->
Box(
modifier = Modifier
.fillMaxWidth()
.height(hourHeight),
) {
if (h > 0) {
Text(
text = formatHourLabel(h, use24Hour, locale),
style = MaterialTheme.typography.labelSmall,
color = MaterialTheme.colorScheme.onSurfaceVariant,
modifier = Modifier
.align(Alignment.TopCenter)
.offset(y = (-6).dp),
)
}
}
}
}
HourGutter(
scrollState = scrollState,
hourHeight = hourHeight,
dragController = dragController,
)
// Day columns: rounded, clipped scroll viewport (permanent corners).
Box(
modifier = Modifier
.weight(1f)
.fillMaxHeight()
.clip(RoundedCornerShape(16.dp))
.verticalScroll(scrollState),
.verticalScroll(scrollState)
.onGloballyPositioned { dragController.geometry.viewport = it },
) {
Row(
modifier = Modifier
.fillMaxWidth()
.height(totalHeight),
horizontalArrangement = Arrangement.spacedBy(2.dp),
.height(totalHeight)
// The scrolling content itself, so its root position
// already folds in the scroll offset.
.onGloballyPositioned { coords ->
val gap = with(density) { COLUMN_GAP.toPx() }
dragController.geometry.let {
it.grid = coords
it.scroll = scrollState
it.hourPx = with(density) { hourHeight.toPx() }
it.columnGapPx = gap
it.columnWidthPx = (coords.size.width + gap) / state.days.size
it.days = state.days
it.isRtl = isRtl
}
},
horizontalArrangement = Arrangement.spacedBy(COLUMN_GAP),
) {
state.days.forEach { day ->
DayColumnCard(
@@ -695,8 +736,10 @@ private fun Timeline(
date = day,
today = state.today,
hourHeight = hourHeight,
dragController = dragController,
onEventClick = onEventClick,
onCreateAt = onCreateAt,
onDrop = onDrop,
modifier = Modifier
.weight(1f)
.fillMaxHeight(),
@@ -715,13 +758,19 @@ private fun DayColumnCard(
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 showHourLines = LocalShowHourLines.current
val hourLineColor = MaterialTheme.colorScheme.outlineVariant
// Tells a settled drop when this column has caught up with it.
LaunchedEffect(blocks, dragController.settling) {
dragController.noteGrid(date, blocks)
}
Card(
// Plain rectangular columns — the soft corners come from the outer
// rounded scroll viewport, so inner rounding would look odd at the edges.
@@ -748,23 +797,39 @@ private fun DayColumnCard(
) {
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 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
EventBlock(
block = block,
dark = dark,
height = height,
width = laneWidth,
onClick = { onEventClick(block.event) },
modifier = Modifier
.offset(x = laneWidth * block.lane, y = top)
.width(laneWidth)
.height(height)
.padding(horizontal = 1.dp),
)
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,
)
EventBlock(
block = block,
dark = dark,
height = place.height,
width = place.width,
date = date,
dragController = dragController,
onClick = { onEventClick(block.event) },
onDrop = onDrop,
modifier = Modifier
.offset(x = place.x, y = place.y)
.width(place.width)
.height(place.height)
.padding(horizontal = 1.dp),
)
}
}
// Current-time line, on top of the events, only on today's column.
if (date == today) {
@@ -780,7 +845,10 @@ private fun EventBlock(
dark: Boolean,
height: Dp,
width: Dp,
date: LocalDate,
dragController: TimelineDragController,
onClick: () -> Unit,
onDrop: (TimelineDrop) -> Unit,
modifier: Modifier = Modifier,
) {
val title = block.event.title.ifBlank { stringResource(R.string.event_untitled) }
@@ -823,12 +891,35 @@ private fun EventBlock(
val dimmed = dimCutoff != null && block.event.hasEnded(dimCutoff)
val soften = LocalSoftenColors.current
val fill = eventFill(block.event.color, dark, soften)
val zone = remember { TimeZone.currentSystemDefault() }
val moveAction = eventMoveAction(block.event)
// A block clipped at the top continues from the previous day: its top edge
// is midnight, not the event's start, so dragging it would invent a time.
val draggable = moveAction != null && block.beginsOn(date, zone)
val dragModifier = rememberEventDragSource(
enabled = draggable,
key = block.event.instanceId,
onPickUp = { pointer, blockRoot, _ -> dragController.begin(block, pointer, blockRoot) },
onMove = dragController::move,
onDrop = { dragController.finish()?.let(onDrop) },
onCancel = dragController::cancel,
)
val lifted = draggable && dragController.ghosts(block, date)
val ghost = ghostAlpha(lifted)
Box(
modifier = (if (dimmed) modifier.alpha(EventDimAlpha) else modifier)
// The source stays put as a ghost while its floating copy travels.
.then(if (ghost < 1f) Modifier.alpha(ghost) else Modifier)
.background(fill, RoundedCornerShape(4.dp))
.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 = 4.dp, vertical = 2.dp)
.semantics { contentDescription = "$title, $timeLabel" },
.semantics {
contentDescription = "$title, $timeLabel"
if (moveAction != null) customActions = listOf(moveAction)
},
) {
Column {
if (showTitle) {
@@ -841,11 +932,8 @@ private fun EventBlock(
)
}
if (showTime) {
Text(
text = timeLabel,
style = MaterialTheme.typography.labelSmall,
maxLines = 1,
overflow = TextOverflow.Ellipsis,
BlockTimeLabel(
label = timeLabel,
color = eventInk(fill, alpha = SECONDARY_INK_ALPHA),
)
}

View File

@@ -65,6 +65,20 @@
<string name="event_edit_recurring_title">Edit recurring event</string>
<string name="event_delete_failed">Couldn\'t delete the event</string>
<string name="event_delete_write_denied">Calendula needs write access to delete events</string>
<!-- Drag an event to another time or day (#68) -->
<string name="event_move_action">Move…</string>
<string name="event_move_recurring_title">Move recurring event</string>
<string name="event_move_occurrence_only">Moving the whole series would change which days it falls on, so only this event can move.</string>
<!-- %1$s is the new date and time, e.g. "Fri, 7 Aug, 09:00". -->
<string name="event_move_done">Moved to %1$s</string>
<string name="event_move_undo">Undo</string>
<string name="event_move_undone">Move undone</string>
<string name="event_move_failed">Couldn\'t move the event</string>
<string name="event_move_write_denied">Calendula needs write access to move events</string>
<string name="event_move_gone">That event no longer exists</string>
<string name="event_move_blocked_series_end">Can\'t move an event past the end of its series</string>
<string name="dialog_cancel">Cancel</string>
<string name="dialog_ok">OK</string>

View File

@@ -5,6 +5,7 @@ import com.google.common.truth.Truth.assertThat
import de.jeanlucmakiola.calendula.domain.AccessLevel
import de.jeanlucmakiola.calendula.domain.Availability
import de.jeanlucmakiola.calendula.domain.EventForm
import de.jeanlucmakiola.calendula.domain.realignRecurrence
import kotlinx.datetime.LocalDate
import kotlinx.datetime.LocalDateTime
import kotlinx.datetime.LocalTime
@@ -285,6 +286,88 @@ class EventWriteMapperTest {
.isEqualTo(instantAt("2026-01-09T14:30", "Europe/Berlin"))
}
@Test
fun `a weekday move must carry the rule with the anchor, or the series stays put`() {
// The anchor moves by the same shift as the occurrence, while RRULE is
// written verbatim: without realignRecurrence nothing moves.
val series = instantAt("2026-01-05T09:00", "Europe/Berlin")
val original = form(
start = LocalDateTime(LocalDate(2026, 6, 8), LocalTime(9, 0)),
end = LocalDateTime(LocalDate(2026, 6, 8), LocalTime(10, 0)),
).copy(rrule = "FREQ=WEEKLY;BYDAY=MO")
val moved = original.copy(
start = LocalDateTime(LocalDate(2026, 6, 10), LocalTime(9, 0)),
end = LocalDateTime(LocalDate(2026, 6, 10), LocalTime(10, 0)),
rrule = realignRecurrence("FREQ=WEEKLY;BYDAY=MO", LocalDate(2026, 6, 8), LocalDate(2026, 6, 10)),
)
val values = update(original, moved, series)
val anchor = java.time.Instant.ofEpochMilli(values[CalendarContract.Events.DTSTART] as Long)
.atZone(java.time.ZoneId.of("Europe/Berlin"))
assertThat(anchor.dayOfWeek).isEqualTo(java.time.DayOfWeek.WEDNESDAY)
assertThat(values[CalendarContract.Events.RRULE]).isEqualTo("FREQ=WEEKLY;BYDAY=WE")
}
@Test
fun `a recurring move keeps the series' length across a DST boundary`() {
// The occurrence being dragged is in CET; the series anchor is in CEST.
val series = instantAt("2026-07-15T09:00", "Europe/Berlin")
val original = form(
start = LocalDateTime(LocalDate(2026, 1, 7), LocalTime(9, 0)),
end = LocalDateTime(LocalDate(2026, 1, 7), LocalTime(10, 30)),
).copy(rrule = "FREQ=WEEKLY")
val moved = original.copy(
start = LocalDateTime(LocalDate(2026, 1, 8), LocalTime(9, 0)),
end = LocalDateTime(LocalDate(2026, 1, 8), LocalTime(10, 30)),
)
assertThat(update(original, moved, series)[CalendarContract.Events.DURATION])
.isEqualTo("P5400S")
}
@Test
fun `shifting a one-off event and back again restores the original values`() {
val original = form()
val moved = original.copy(
start = LocalDateTime(LocalDate(2026, 6, 12), LocalTime(14, 0)),
end = LocalDateTime(LocalDate(2026, 6, 12), LocalTime(15, 0)),
)
val forward = update(original, moved)
val back = update(moved, original)
assertThat(back[CalendarContract.Events.DTSTART])
.isEqualTo(original.toWriteTimes(berlin).dtStartMillis)
assertThat(back[CalendarContract.Events.DTEND])
.isEqualTo(original.toWriteTimes(berlin).dtEndMillis)
assertThat(forward[CalendarContract.Events.DTSTART])
.isNotEqualTo(back[CalendarContract.Events.DTSTART])
}
@Test
fun `undoing a whole-series move lands the anchor back where it started`() {
// What makes undo safe for "all events": the shift is applied to the
// anchor the provider currently holds, so re-issuing it with the two
// forms swapped applies the exact inverse to the moved anchor.
val series = instantAt("2026-01-07T09:00", "Europe/Berlin")
val original = form(
start = LocalDateTime(LocalDate(2026, 7, 15), LocalTime(9, 0)),
end = LocalDateTime(LocalDate(2026, 7, 15), LocalTime(10, 0)),
).copy(rrule = "FREQ=WEEKLY")
val moved = original.copy(
start = LocalDateTime(LocalDate(2026, 7, 17), LocalTime(14, 30)),
end = LocalDateTime(LocalDate(2026, 7, 17), LocalTime(15, 30)),
)
val movedAnchor = update(original, moved, series)[CalendarContract.Events.DTSTART] as Long
assertThat(movedAnchor).isNotEqualTo(series)
val restored = update(moved, original, movedAnchor)
assertThat(restored[CalendarContract.Events.DTSTART]).isEqualTo(series)
assertThat(restored[CalendarContract.Events.DURATION]).isEqualTo("P3600S")
}
@Test
fun `switching a recurring event to all-day anchors the series on a UTC midnight`() {
val series = instantAt("2026-01-07T09:00", "Europe/Berlin")

View File

@@ -94,6 +94,26 @@ class CalendarRowStateTest {
assertThat(calendar.isEventTarget).isFalse()
}
@Test
fun `a managed calendar's events are editable but never movable`() {
// Their date is owned by the contacts sync, so a drag would be undone.
val managed = cal().copy(isManaged = true)
assertThat(managed.allowsEventMove).isFalse()
}
@Test
fun `a read-only calendar's events are not movable`() {
assertThat(cal().copy(canModifyContents = false).allowsEventMove).isFalse()
}
@Test
fun `a switched-off calendar's events stay movable, unlike a new-event target`() {
// The predicate is deliberately not isEventTarget.
val hidden = cal().copy(isVisibleInSystem = false)
assertThat(hidden.isEventTarget).isFalse()
assertThat(hidden.allowsEventMove).isTrue()
}
@Test
fun `manager order puts non-syncing calendars last and is otherwise stable`() {
val ordered = listOf(

View File

@@ -0,0 +1,155 @@
package de.jeanlucmakiola.calendula.domain
import com.google.common.truth.Truth.assertThat
import kotlinx.datetime.LocalDate
import kotlinx.datetime.LocalDateTime
import kotlinx.datetime.LocalTime
import kotlinx.datetime.TimeZone
import kotlinx.datetime.toInstant
import org.junit.jupiter.api.Test
class EventShiftTest {
private val berlin = TimeZone.of("Europe/Berlin")
private val newYork = TimeZone.of("America/New_York")
private fun form(
start: LocalDateTime = LocalDateTime(LocalDate(2026, 6, 11), LocalTime(10, 0)),
end: LocalDateTime = LocalDateTime(LocalDate(2026, 6, 11), LocalTime(11, 0)),
timezone: String? = null,
isAllDay: Boolean = false,
) = EventForm(
calendarId = 1L,
title = "Standup",
isAllDay = isAllDay,
start = start,
end = end,
timezone = timezone,
)
@Test
fun `shifting to a new start keeps the length`() {
val original = form()
val target = LocalDateTime(LocalDate(2026, 6, 12), LocalTime(14, 30)).toInstant(berlin)
val moved = original.shiftedTo(target, berlin)
assertThat(moved.start).isEqualTo(LocalDateTime(LocalDate(2026, 6, 12), LocalTime(14, 30)))
assertThat(moved.end).isEqualTo(LocalDateTime(LocalDate(2026, 6, 12), LocalTime(15, 30)))
}
@Test
fun `a pinned event is re-derived in its own zone, not the device's`() {
// 09:00 in New York, opened on a Berlin device.
val original = form(
start = LocalDateTime(LocalDate(2026, 6, 11), LocalTime(9, 0)),
end = LocalDateTime(LocalDate(2026, 6, 11), LocalTime(10, 0)),
timezone = "America/New_York",
)
// The grid says "15:30 Berlin", which is 09:30 in New York.
val target = LocalDateTime(LocalDate(2026, 6, 11), LocalTime(15, 30)).toInstant(berlin)
val moved = original.shiftedTo(target, berlin)
assertThat(moved.timezone).isEqualTo("America/New_York")
assertThat(moved.start).isEqualTo(LocalDateTime(LocalDate(2026, 6, 11), LocalTime(9, 30)))
assertThat(moved.end).isEqualTo(LocalDateTime(LocalDate(2026, 6, 11), LocalTime(10, 30)))
}
@Test
fun `the instant duration survives a shift across spring forward`() {
// 2026-03-29 02:00 CET is when Berlin skips to 03:00.
val original = form(
start = LocalDateTime(LocalDate(2026, 3, 28), LocalTime(23, 0)),
end = LocalDateTime(LocalDate(2026, 3, 29), LocalTime(1, 0)),
)
val target = LocalDateTime(LocalDate(2026, 3, 29), LocalTime(1, 0)).toInstant(berlin)
val moved = original.shiftedTo(target, berlin)
// Two real hours from 01:00 CET lands at 04:00 CEST: the hour in
// between does not exist.
assertThat(moved.start).isEqualTo(LocalDateTime(LocalDate(2026, 3, 29), LocalTime(1, 0)))
assertThat(moved.end).isEqualTo(LocalDateTime(LocalDate(2026, 3, 29), LocalTime(4, 0)))
assertThat(moved.end.toInstant(berlin) - moved.start.toInstant(berlin))
.isEqualTo(original.end.toInstant(berlin) - original.start.toInstant(berlin))
}
@Test
fun `a drop into the spring-forward gap resolves forward by the missing hour`() {
val original = form()
// 02:30 does not exist on 2026-03-29 in Berlin.
val target = LocalDateTime(LocalDate(2026, 3, 29), LocalTime(2, 30)).toInstant(berlin)
val moved = original.shiftedTo(target, berlin)
assertThat(moved.start).isEqualTo(LocalDateTime(LocalDate(2026, 3, 29), LocalTime(3, 30)))
}
@Test
fun `a zero-distance drop leaves the form untouched`() {
val original = form()
assertThat(original.shiftedTo(original.start.toInstant(berlin), berlin)).isEqualTo(original)
}
@Test
fun `an unparseable pinned zone falls back to the device, like the write path`() {
val original = form(timezone = "Mars/Olympus")
val target = LocalDateTime(LocalDate(2026, 6, 11), LocalTime(12, 0)).toInstant(newYork)
val moved = original.shiftedTo(target, newYork)
assertThat(moved.start).isEqualTo(LocalDateTime(LocalDate(2026, 6, 11), LocalTime(12, 0)))
}
@Test
fun `an all-day event ignores shiftedTo and moves by whole days instead`() {
val allDay = form(isAllDay = true)
val target = LocalDateTime(LocalDate(2026, 7, 1), LocalTime(3, 0)).toInstant(berlin)
assertThat(allDay.shiftedTo(target, berlin)).isEqualTo(allDay)
val moved = allDay.shiftedByDays(3, berlin)
assertThat(moved.start.date).isEqualTo(LocalDate(2026, 6, 14))
assertThat(moved.end.date).isEqualTo(LocalDate(2026, 6, 14))
// The placeholder times exist only for a switch back to timed; untouched.
assertThat(moved.start.time).isEqualTo(allDay.start.time)
}
@Test
fun `a multi-day event keeps its span when shifted by days`() {
val multiDay = form(
start = LocalDateTime(LocalDate(2026, 6, 11), LocalTime(22, 0)),
end = LocalDateTime(LocalDate(2026, 6, 13), LocalTime(2, 0)),
)
val moved = multiDay.shiftedByDays(-2, berlin)
assertThat(moved.start).isEqualTo(LocalDateTime(LocalDate(2026, 6, 9), LocalTime(22, 0)))
assertThat(moved.end).isEqualTo(LocalDateTime(LocalDate(2026, 6, 11), LocalTime(2, 0)))
}
@Test
fun `a timed shift onto a DST changeover keeps the real length, not the wall clock`() {
// 22:00 Sat -> 04:00 Sun is six real hours, onto the Sunday Berlin
// springs forward on. Keeping wall clock would write five.
val overnight = form(
start = LocalDateTime(LocalDate(2026, 3, 21), LocalTime(22, 0)),
end = LocalDateTime(LocalDate(2026, 3, 22), LocalTime(4, 0)),
)
val moved = overnight.shiftedByDays(7, berlin)
assertThat(moved.start).isEqualTo(LocalDateTime(LocalDate(2026, 3, 28), LocalTime(22, 0)))
assertThat(moved.end.toInstant(berlin) - moved.start.toInstant(berlin))
.isEqualTo(overnight.end.toInstant(berlin) - overnight.start.toInstant(berlin))
// The wall-clock end therefore lands an hour later than a naive +7 days.
assertThat(moved.end).isEqualTo(LocalDateTime(LocalDate(2026, 3, 29), LocalTime(5, 0)))
}
@Test
fun `shifting by no days is a no-op`() {
val original = form()
assertThat(original.shiftedByDays(0, berlin)).isEqualTo(original)
}
}

View File

@@ -0,0 +1,111 @@
package de.jeanlucmakiola.calendula.domain
import com.google.common.truth.Truth.assertThat
import kotlinx.datetime.LocalDate
import org.junit.jupiter.api.Test
class RecurrenceRealignTest {
private val monday = LocalDate(2026, 6, 8)
private val wednesday = LocalDate(2026, 6, 10)
@Test
fun `a weekly BYDAY rule follows the occurrence to its new weekday`() {
assertThat(realignRecurrence("FREQ=WEEKLY;BYDAY=MO", monday, wednesday))
.isEqualTo("FREQ=WEEKLY;BYDAY=WE")
}
@Test
fun `unrelated parts survive the rewrite`() {
assertThat(
realignRecurrence("FREQ=WEEKLY;INTERVAL=2;BYDAY=MO;COUNT=10", monday, wednesday),
).isEqualTo("FREQ=WEEKLY;INTERVAL=2;BYDAY=WE;COUNT=10")
}
@Test
fun `a day-of-month rule is refused, because the anchor moves by days not dates`() {
// BYMONTHDAY=28 with a January anchor, occurrence Feb 28 dragged to Mar 1:
// the rebuilt rule would say the 1st while the anchor became Jan 29 — a
// DTSTART that is not an instance of its own rule.
assertThat(realignRecurrence("FREQ=MONTHLY;BYMONTHDAY=8", monday, wednesday)).isNull()
assertThat(
realignRecurrence("FREQ=YEARLY;BYMONTH=6;BYMONTHDAY=8", monday, LocalDate(2026, 7, 20)),
).isNull()
}
@Test
fun `BYDAY on a non-weekly rule is refused`() {
// parseSimpleRecurrence can't read it either, so the UNTIL guard
// downstream would be blind to it.
assertThat(realignRecurrence("FREQ=MONTHLY;BYDAY=MO", monday, wednesday)).isNull()
}
@Test
fun `a rule with no FREQ is refused`() {
assertThat(realignRecurrence("INTERVAL=2;BYDAY=MO", monday, wednesday)).isNull()
}
@Test
fun `a rule with no day-selecting part needs no rewrite`() {
assertThat(realignRecurrence("FREQ=DAILY;INTERVAL=3", monday, wednesday))
.isEqualTo("FREQ=DAILY;INTERVAL=3")
assertThat(realignRecurrence("FREQ=WEEKLY", monday, wednesday)).isEqualTo("FREQ=WEEKLY")
}
@Test
fun `a rule the move does not disturb comes back verbatim`() {
val rule = "FREQ=WEEKLY;BYDAY=MO,WE,FR"
assertThat(realignRecurrence(rule, monday, monday)).isEqualTo(rule)
}
@Test
fun `a multi-day BYDAY cannot be resolved from one moved occurrence`() {
assertThat(realignRecurrence("FREQ=WEEKLY;BYDAY=MO,WE", monday, wednesday)).isNull()
}
@Test
fun `an ordinal BYDAY cannot be resolved`() {
assertThat(realignRecurrence("FREQ=MONTHLY;BYDAY=2MO", monday, wednesday)).isNull()
}
@Test
fun `a BYDAY that does not name the occurrence's own weekday is refused`() {
// The rule and DTSTART already disagree; guessing would make it worse.
assertThat(realignRecurrence("FREQ=WEEKLY;BYDAY=TU", monday, wednesday)).isNull()
}
@Test
fun `parts we cannot reason about are refused rather than guessed`() {
assertThat(realignRecurrence("FREQ=WEEKLY;BYDAY=MO;BYSETPOS=1", monday, wednesday))
.isNull()
assertThat(realignRecurrence("FREQ=YEARLY;BYYEARDAY=159", monday, wednesday)).isNull()
}
@Test
fun `everything realignable is also a rule the UNTIL guard can read`() {
// problems() checks UNTIL through parseSimpleRecurrence; a rule this
// realigns but that parser rejects would go unchecked.
val realignable = listOf(
"FREQ=WEEKLY;BYDAY=MO",
"FREQ=WEEKLY;INTERVAL=2;BYDAY=MO;UNTIL=20261231T225959Z",
"FREQ=DAILY;COUNT=5",
)
realignable.forEach { rule ->
assertThat(realignRecurrence(rule, monday, wednesday)).isNotNull()
assertThat(parseSimpleRecurrence(realignRecurrence(rule, monday, wednesday)!!))
.isNotNull()
}
}
@Test
fun `a leading RRULE prefix is preserved`() {
assertThat(realignRecurrence("RRULE:FREQ=WEEKLY;BYDAY=MO", monday, wednesday))
.isEqualTo("RRULE:FREQ=WEEKLY;BYDAY=WE")
}
@Test
fun `a malformed rule is refused`() {
assertThat(realignRecurrence("FREQ=WEEKLY;GARBAGE", monday, wednesday)).isNull()
assertThat(realignRecurrence("", monday, wednesday)).isNull()
}
}

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@@ -0,0 +1,497 @@
package de.jeanlucmakiola.calendula.ui.common
import androidx.datastore.preferences.core.PreferenceDataStoreFactory
import com.google.common.truth.Truth.assertThat
import de.jeanlucmakiola.calendula.data.calendar.CalendarRepositoryImpl
import de.jeanlucmakiola.calendula.data.calendar.FakeCalendarDataSource
import de.jeanlucmakiola.calendula.data.prefs.CalendarPrefs
import de.jeanlucmakiola.calendula.data.prefs.SettingsPrefs
import de.jeanlucmakiola.calendula.domain.CalendarSource
import de.jeanlucmakiola.calendula.domain.EventDetail
import de.jeanlucmakiola.calendula.domain.EventInstance
import de.jeanlucmakiola.calendula.domain.RecurringWriteScope
import kotlinx.coroutines.CoroutineDispatcher
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.ExperimentalCoroutinesApi
import kotlinx.coroutines.Job
import kotlinx.coroutines.launch
import kotlinx.coroutines.test.UnconfinedTestDispatcher
import kotlinx.coroutines.test.advanceUntilIdle
import kotlinx.coroutines.test.resetMain
import kotlinx.coroutines.test.runTest
import kotlinx.coroutines.test.setMain
import kotlinx.datetime.LocalDate
import kotlinx.datetime.LocalDateTime
import kotlinx.datetime.LocalTime
import kotlinx.datetime.TimeZone
import kotlinx.datetime.toInstant
import org.junit.jupiter.api.AfterEach
import org.junit.jupiter.api.BeforeEach
import org.junit.jupiter.api.Test
import org.junit.jupiter.api.io.TempDir
import java.nio.file.Path
import kotlin.time.Instant
/**
* The drop pipeline: which repository call a scope maps to, when a recurring drop
* has to ask first, and every case that must refuse to write.
*/
@OptIn(ExperimentalCoroutinesApi::class)
class RescheduleViewModelTest {
private val dispatcher = UnconfinedTestDispatcher()
@BeforeEach fun setUp() = Dispatchers.setMain(dispatcher)
@AfterEach fun tearDown() = Dispatchers.resetMain()
// Monday 2026-06-08, midday in the device zone — the zone the drop path
// reads dates back in. The BYDAY assertions depend on it being a Monday.
private val monday = LocalDate(2026, 6, 8)
private val beginMillis = LocalDateTime(monday, LocalTime(12, 0))
.toInstant(TimeZone.currentSystemDefault())
.toEpochMilliseconds()
private val endMillis = beginMillis + 3_600_000L
private fun cal(
id: Long,
canModify: Boolean = true,
managed: Boolean = false,
): CalendarSource = CalendarSource(
id = id, displayName = "Cal $id", accountName = "acc@local", accountType = "LOCAL",
color = 0xFF112233.toInt(), isVisibleInSystem = true, canModifyContents = canModify,
isManaged = managed,
)
private fun detail(
rrule: String? = null,
isAllDay: Boolean = false,
isException: Boolean = false,
anchorMillis: Long = beginMillis,
): EventDetail = EventDetail(
instance = EventInstance(
instanceId = 42L, eventId = 42L, calendarId = 1L, title = "Standup",
start = Instant.fromEpochMilliseconds(anchorMillis),
end = Instant.fromEpochMilliseconds(anchorMillis + (endMillis - beginMillis)),
isAllDay = isAllDay, color = 0xFF000000.toInt(), location = null,
),
description = null, organizer = null, attendees = emptyList(), rrule = rrule,
isException = isException,
)
private fun viewModel(tempDir: Path, fake: FakeCalendarDataSource): RescheduleViewModel {
val prefs = CalendarPrefs(
PreferenceDataStoreFactory.create(
scope = CoroutineScope(dispatcher),
produceFile = { tempDir.resolve("move_prefs.preferences_pb").toFile() },
),
)
val settings = SettingsPrefs(
PreferenceDataStoreFactory.create(
scope = CoroutineScope(dispatcher),
produceFile = { tempDir.resolve("move_settings.preferences_pb").toFile() },
),
)
val repo = CalendarRepositoryImpl(fake, prefs, settings, dispatcher as CoroutineDispatcher)
return RescheduleViewModel(repo, dispatcher)
}
private fun CoroutineScope.activate(vm: RescheduleViewModel): Job =
launch { vm.movableCalendarIds.collect {} }
/** A drop two days later, expressed the way the month grid expresses one. */
private fun toWednesday() = MoveRequest(
eventId = 42L,
beginMillis = beginMillis,
endMillis = endMillis,
target = MoveTarget.ByDays(2),
)
/** A drop an hour later, expressed the way a timeline drag expresses one. */
private fun oneHourLater() = MoveRequest(
eventId = 42L,
beginMillis = beginMillis,
endMillis = endMillis,
target = MoveTarget.Start(Instant.fromEpochMilliseconds(beginMillis + 3_600_000L)),
)
@Test
fun `a one-off drop writes straight through with no scope prompt`(
@TempDir tempDir: Path,
) = runTest(dispatcher) {
val fake = FakeCalendarDataSource().apply { eventDetailResult = { detail() } }
val vm = viewModel(tempDir, fake)
vm.move(oneHourLater())
advanceUntilIdle()
assertThat(vm.scopePrompt.value).isNull()
assertThat(fake.updatedEvents).hasSize(1)
val (id, original, updated) = fake.updatedEvents.single()
assertThat(id).isEqualTo(42L)
assertThat(updated.start).isNotEqualTo(original.start)
assertThat(vm.outcome.value).isInstanceOf(MoveOutcome.Moved::class.java)
}
@Test
fun `a recurring drop parks for the scope instead of writing`(
@TempDir tempDir: Path,
) = runTest(dispatcher) {
val fake = FakeCalendarDataSource().apply {
eventDetailResult = { detail(rrule = "FREQ=WEEKLY") }
}
val vm = viewModel(tempDir, fake)
vm.move(oneHourLater())
advanceUntilIdle()
assertThat(vm.scopePrompt.value).isEqualTo(MoveScopePrompt(occurrenceOnly = false))
assertThat(fake.updatedEvents).isEmpty()
assertThat(fake.updatedOccurrences).isEmpty()
}
@Test
fun `each scope maps to its own repository call`(@TempDir tempDir: Path) = runTest(dispatcher) {
val occurrence = FakeCalendarDataSource().apply {
eventDetailResult = { detail(rrule = "FREQ=WEEKLY") }
}
viewModel(tempDir.resolve("a").also { it.toFile().mkdirs() }, occurrence).run {
move(oneHourLater())
moveWithScope(RecurringWriteScope.ThisEvent)
}
advanceUntilIdle()
assertThat(occurrence.updatedOccurrences).hasSize(1)
assertThat(occurrence.updatedOccurrences.single().second).isEqualTo(beginMillis)
val following = FakeCalendarDataSource().apply {
eventDetailResult = { detail(rrule = "FREQ=WEEKLY") }
}
viewModel(tempDir.resolve("b").also { it.toFile().mkdirs() }, following).run {
move(oneHourLater())
moveWithScope(RecurringWriteScope.ThisAndFollowing)
}
advanceUntilIdle()
assertThat(following.updatedFromOccurrences).hasSize(1)
val series = FakeCalendarDataSource().apply {
eventDetailResult = { detail(rrule = "FREQ=WEEKLY") }
}
viewModel(tempDir.resolve("c").also { it.toFile().mkdirs() }, series).run {
move(oneHourLater())
moveWithScope(RecurringWriteScope.AllEvents)
}
advanceUntilIdle()
assertThat(series.updatedEvents).hasSize(1)
}
@Test
fun `a weekly BYDAY rule is realigned when the whole series moves weekday`(
@TempDir tempDir: Path,
) = runTest(dispatcher) {
val fake = FakeCalendarDataSource().apply {
eventDetailResult = { detail(rrule = "FREQ=WEEKLY;BYDAY=MO") }
}
val vm = viewModel(tempDir, fake)
vm.move(toWednesday())
vm.moveWithScope(RecurringWriteScope.AllEvents)
advanceUntilIdle()
// Without this the anchor becomes a Wednesday while the rule still says
// Monday, and the series does not move at all.
assertThat(fake.updatedEvents.single().third.rrule).isEqualTo("FREQ=WEEKLY;BYDAY=WE")
}
@Test
fun `a rule that cannot be realigned offers only the single occurrence`(
@TempDir tempDir: Path,
) = runTest(dispatcher) {
val fake = FakeCalendarDataSource().apply {
eventDetailResult = { detail(rrule = "FREQ=WEEKLY;BYDAY=MO,WE") }
}
val vm = viewModel(tempDir, fake)
vm.move(toWednesday())
advanceUntilIdle()
assertThat(vm.scopePrompt.value).isEqualTo(MoveScopePrompt(occurrenceOnly = true))
}
@Test
fun `a same-time drop within one day still needs no realignment`(
@TempDir tempDir: Path,
) = runTest(dispatcher) {
val fake = FakeCalendarDataSource().apply {
eventDetailResult = { detail(rrule = "FREQ=WEEKLY;BYDAY=MO,WE") }
}
val vm = viewModel(tempDir, fake)
vm.move(oneHourLater())
advanceUntilIdle()
// The weekday is unchanged, so the ambiguous BYDAY is not in the way.
assertThat(vm.scopePrompt.value).isEqualTo(MoveScopePrompt(occurrenceOnly = false))
}
@Test
fun `a time-only drop that would carry the anchor past midnight offers only the occurrence`(
@TempDir tempDir: Path,
) = runTest(dispatcher) {
// The anchor sits at 23:30 while the dragged occurrence is at midday —
// only possible when the row pins no zone, so the two resolve an hour
// apart. +1h leaves the occurrence on its day but rolls the anchor onto
// the next one, which would leave BYDAY naming the wrong weekday.
val anchor = LocalDateTime(LocalDate(2026, 6, 1), LocalTime(23, 30))
.toInstant(TimeZone.currentSystemDefault())
.toEpochMilliseconds()
val fake = FakeCalendarDataSource().apply {
eventDetailResult = { detail(rrule = "FREQ=WEEKLY;BYDAY=MO", anchorMillis = anchor) }
}
val vm = viewModel(tempDir, fake)
vm.move(oneHourLater())
advanceUntilIdle()
assertThat(vm.scopePrompt.value).isEqualTo(MoveScopePrompt(occurrenceOnly = true))
}
@Test
fun `a second drop is refused while the first is still in flight`(
@TempDir tempDir: Path,
) = runTest(dispatcher) {
val fake = FakeCalendarDataSource().apply {
eventDetailResult = { detail(rrule = "FREQ=WEEKLY;BYDAY=MO") }
}
val vm = viewModel(tempDir, fake)
assertThat(vm.move(toWednesday())).isTrue()
advanceUntilIdle()
// Parked on the scope dialog, so the first drop still owns the pipeline.
assertThat(vm.move(oneHourLater())).isFalse()
advanceUntilIdle()
assertThat(fake.updatedEvents).isEmpty()
}
@Test
fun `undo is refused while a write is running`(@TempDir tempDir: Path) = runTest(dispatcher) {
val fake = FakeCalendarDataSource().apply { eventDetailResult = { detail() } }
val vm = viewModel(tempDir, fake)
vm.move(oneHourLater())
advanceUntilIdle()
val undo = (vm.outcome.value as MoveOutcome.Moved).undo!!
// A second drop parks on its scope dialog, which holds the pipeline.
fake.eventDetailResult = { detail(rrule = "FREQ=WEEKLY;BYDAY=MO") }
vm.move(toWednesday())
advanceUntilIdle()
assertThat(vm.undo(undo)).isFalse()
advanceUntilIdle()
assertThat(fake.updatedEvents).hasSize(1)
}
@Test
fun `an exception row is written as a plain event, never as a nested exception`(
@TempDir tempDir: Path,
) = runTest(dispatcher) {
val fake = FakeCalendarDataSource().apply {
// A sync adapter that left the series' rule on the override row.
eventDetailResult = { detail(rrule = "FREQ=WEEKLY", isException = true) }
}
val vm = viewModel(tempDir, fake)
vm.move(oneHourLater())
advanceUntilIdle()
assertThat(vm.scopePrompt.value).isNull()
assertThat(fake.updatedEvents).hasSize(1)
assertThat(fake.updatedOccurrences).isEmpty()
}
@Test
fun `a drop past the series' own UNTIL is refused, not written`(
@TempDir tempDir: Path,
) = runTest(dispatcher) {
val fake = FakeCalendarDataSource().apply {
// Midday UTC, so the device zone can't push the UNTIL date onto the
// day the event is being dragged to.
eventDetailResult = { detail(rrule = "FREQ=WEEKLY;UNTIL=20260608T120000Z") }
}
val vm = viewModel(tempDir, fake)
vm.move(toWednesday())
vm.moveWithScope(RecurringWriteScope.AllEvents)
advanceUntilIdle()
assertThat(vm.outcome.value).isEqualTo(MoveOutcome.BlockedSeriesEnd)
assertThat(fake.updatedEvents).isEmpty()
}
@Test
fun `dragging a bounded series' last occurrence still allows moving just it`(
@TempDir tempDir: Path,
) = runTest(dispatcher) {
val fake = FakeCalendarDataSource().apply {
eventDetailResult = { detail(rrule = "FREQ=WEEKLY;UNTIL=20260608T120000Z") }
}
val vm = viewModel(tempDir, fake)
vm.move(toWednesday())
advanceUntilIdle()
// An exception row is constrained by no UNTIL, so the scope stays on offer.
assertThat(vm.scopePrompt.value).isNotNull()
vm.moveWithScope(RecurringWriteScope.ThisEvent)
advanceUntilIdle()
assertThat(fake.updatedOccurrences).hasSize(1)
assertThat(vm.outcome.value).isInstanceOf(MoveOutcome.Moved::class.java)
}
@Test
fun `a drag that changes both the day and the time cannot move the series`(
@TempDir tempDir: Path,
) = runTest(dispatcher) {
val fake = FakeCalendarDataSource().apply {
eventDetailResult = { detail(rrule = "FREQ=WEEKLY;BYDAY=MO") }
}
val vm = viewModel(tempDir, fake)
// Onto the next day *and* two hours later: a late enough anchor would
// cross two midnights under the same wall-clock shift.
vm.move(
MoveRequest(
eventId = 42L,
beginMillis = beginMillis,
endMillis = endMillis,
target = MoveTarget.Start(
Instant.fromEpochMilliseconds(beginMillis + 26 * 3_600_000L),
),
),
)
advanceUntilIdle()
assertThat(vm.scopePrompt.value).isEqualTo(MoveScopePrompt(occurrenceOnly = true))
}
@Test
fun `a zero-distance drop writes nothing and says nothing`(
@TempDir tempDir: Path,
) = runTest(dispatcher) {
val fake = FakeCalendarDataSource().apply { eventDetailResult = { detail() } }
val vm = viewModel(tempDir, fake)
vm.move(
MoveRequest(
eventId = 42L,
beginMillis = beginMillis,
endMillis = endMillis,
target = MoveTarget.Start(Instant.fromEpochMilliseconds(beginMillis)),
),
)
advanceUntilIdle()
assertThat(fake.updatedEvents).isEmpty()
assertThat(vm.outcome.value).isNull()
}
@Test
fun `a vanished event reports itself as gone`(@TempDir tempDir: Path) = runTest(dispatcher) {
val fake = FakeCalendarDataSource().apply { eventDetailResult = { null } }
val vm = viewModel(tempDir, fake)
vm.move(oneHourLater())
advanceUntilIdle()
assertThat(vm.outcome.value).isEqualTo(MoveOutcome.Gone)
}
@Test
fun `a revoked write permission is reported apart from a plain failure`(
@TempDir tempDir: Path,
) = runTest(dispatcher) {
val fake = FakeCalendarDataSource().apply {
eventDetailResult = { detail() }
writeError = SecurityException("revoked")
}
val vm = viewModel(tempDir, fake)
vm.move(oneHourLater())
advanceUntilIdle()
assertThat(vm.outcome.value).isEqualTo(MoveOutcome.WriteDenied)
}
@Test
fun `undo writes the move back the other way`(@TempDir tempDir: Path) = runTest(dispatcher) {
val fake = FakeCalendarDataSource().apply { eventDetailResult = { detail() } }
val vm = viewModel(tempDir, fake)
vm.move(oneHourLater())
advanceUntilIdle()
val undo = (vm.outcome.value as MoveOutcome.Moved).undo
assertThat(undo).isNotNull()
vm.undo(undo!!)
advanceUntilIdle()
assertThat(fake.updatedEvents).hasSize(2)
val forward = fake.updatedEvents[0]
val back = fake.updatedEvents[1]
assertThat(back.second).isEqualTo(forward.third)
assertThat(back.third).isEqualTo(forward.second)
assertThat(vm.outcome.value).isEqualTo(MoveOutcome.Undone)
}
@Test
fun `an occurrence write offers no undo, since shifting back cannot restore it`(
@TempDir tempDir: Path,
) = runTest(dispatcher) {
val fake = FakeCalendarDataSource().apply {
eventDetailResult = { detail(rrule = "FREQ=WEEKLY") }
}
val vm = viewModel(tempDir, fake)
vm.move(oneHourLater())
vm.moveWithScope(RecurringWriteScope.ThisEvent)
advanceUntilIdle()
assertThat((vm.outcome.value as MoveOutcome.Moved).undo).isNull()
}
@Test
fun `only writable, unmanaged calendars can be dragged from`(
@TempDir tempDir: Path,
) = runTest(dispatcher) {
val fake = FakeCalendarDataSource().apply {
calendarsResult = listOf(
cal(1L),
cal(2L, canModify = false),
cal(3L, managed = true),
)
}
val vm = viewModel(tempDir, fake)
val job = activate(vm)
advanceUntilIdle()
assertThat(vm.movableCalendarIds.value).containsExactly(1L)
job.cancel()
}
@Test
fun `cancelling the scope dialog writes nothing`(@TempDir tempDir: Path) = runTest(dispatcher) {
val fake = FakeCalendarDataSource().apply {
eventDetailResult = { detail(rrule = "FREQ=WEEKLY") }
}
val vm = viewModel(tempDir, fake)
vm.move(oneHourLater())
vm.cancelScope()
advanceUntilIdle()
assertThat(vm.scopePrompt.value).isNull()
assertThat(fake.updatedEvents).isEmpty()
assertThat(fake.updatedOccurrences).isEmpty()
}
}

View File

@@ -27,6 +27,14 @@ class TimeFormatTest {
assertThat(formatMinuteOfDay(13 * 60 + 15, is24Hour = true, Locale.US)).isEqualTo("13:15")
}
@Test
fun `gutter time drops the meridiem and clamps to the day`() {
assertThat(formatGutterTime(9 * 60 + 15, is24Hour = true, Locale.US)).isEqualTo("09:15")
assertThat(formatGutterTime(13 * 60 + 45, is24Hour = false, Locale.US)).isEqualTo("1:45")
assertThat(formatGutterTime(0, is24Hour = false, Locale.US)).isEqualTo("12:00")
assertThat(formatGutterTime(1_440, is24Hour = true, Locale.US)).isEqualTo("23:59")
}
@Test
fun `hour label is zero-padded in 24h and compact am-pm in 12h`() {
assertThat(formatHourLabel(13, is24Hour = true, Locale.US)).isEqualTo("13")

View File

@@ -108,6 +108,83 @@ on-device):
UTC, so zones ahead of UTC can't leak an extra occurrence.
- All-day events are normalised to UTC midnights with an exclusive end.
### Drag to reschedule
Dropping an event on another slot (#68) is not a second write path: the drop
loads the event, prefills the **same** `toEditForm` the edit screen uses, shifts
it (`EventShift.kt`), and dispatches through the same three repository calls a
save does — so recurring writes, reminder reconciliation and attendee
preservation behave identically. The full form is carried through, never a
stripped one: `updateOccurrence` reconciles reminders *and* attendees onto the
new exception row, and a partial form would wipe them.
Two things the drag has to get right that the edit screen sidesteps:
- **`RRULE` day parts go stale.** `buildEventUpdateValues` writes the rule
verbatim while `DTSTART` moves, so dragging a `FREQ=WEEKLY;BYDAY=MO` occurrence
onto a Wednesday under *All events* leaves a Wednesday anchor under a Monday
rule and the series does not move. `realignRecurrence` re-derives `BYDAY`, and
returns **null** for everything else — the drop then offers only *this event*,
whose exception row carries no rule at all. The same staleness is reachable
from the edit screen; wiring it there too is a separate change.
What the rule has to agree with is the **series anchor**, not the occurrence
being dragged, and `buildEventUpdateValues` moves that anchor by the same
*wall-clock* shift. So the realigner only touches weekday, which is uniform mod
7 and therefore survives that shift whatever time of day the anchor sits at.
Day-of-month is not uniform — `BYMONTHDAY=28` with a January anchor, occurrence
Feb 28 dragged to Mar 1, would leave a Jan 29 anchor under a `BYMONTHDAY=1`
rule, a DTSTART that is not an instance of its own rule and a phantom
occurrence on any client that trusts it.
Uniform mod 7 is not enough on its own: the anchor also has to cross the *same
number of midnights* as the occurrence did, or the rebuilt weekday is off by a
day. `RescheduleViewModel` requires that of every write wider than one
occurrence, in the two shapes a drag comes in:
- a drag that **changes the day** must be a whole number of days, so the two
move in step whatever the anchor's time of day;
- a **time-only** drag must leave the anchor on its own day. That is normally
free, since the anchor shares the occurrence's time of day — but a row with
no `EVENT_TIMEZONE` resolves anchor and occurrence in zones that can sit a
DST hour apart, and a near-midnight drag would then carry the anchor across a
midnight the occurrence never crossed.
Whatever falls outside — a rule the realigner won't rebuild, or a shift that
would move rule and anchor out of step — may only move the one occurrence.
The accepted parts are deliberately a **subset** of what `parseSimpleRecurrence`
understands, so anything realignable is also a rule whose `UNTIL` the guard
below can actually read.
- **The eligibility gate is load-bearing.** Nothing below the UI refuses a
write, so `CalendarSource.allowsEventMove` is what keeps read-only and
contact-managed events from being dragged. It is deliberately *not*
`isEventTarget`: a managed event is editable (reminders, notes) yet must never
move, while a switched-off calendar renders nothing to grab anyway.
A drop that would push a series past its own `UNTIL` — the provider then
generates zero occurrences and the event vanishes from every view — is refused
rather than written. The check happens at **write** time, not at drop time,
because which date has to clear `UNTIL` depends on how far the write reaches: a
whole-series move carries the *anchor*, a split starts a new series at the moved
occurrence, and a single occurrence becomes an exception row that no `UNTIL`
constrains. Testing the occurrence in every case would refuse the perfectly
ordinary drag of a bounded series' last occurrence.
**One drop is written at a time.** Two drops of the same recurring event landing
inside one write window would each compute their shift from the same pre-move
occurrence, while the data layer applies both to the re-read anchor — so the
shifts would compound. `RescheduleViewModel.move` therefore refuses while a write
(or its scope dialog) is outstanding, and says so in its return value: the view
that took the drop releases the block it was holding on the target instead of
waiting out a settle that will never arrive.
Two known limitations of a whole-series move, both shared with the edit screen's
own *All events* time save rather than introduced here — a drag just makes them
one gesture away: the series' `EXDATE` stamps and its exception rows are **not**
re-anchored, so previously deleted occurrences can reappear and previously
modified ones stay behind while the rest of the series moves.
### Event time zones
`EventForm.timezone` is the zone its wall-clock times mean, and **null means
@@ -144,6 +221,22 @@ changes to untouched fields survive either way. Fields the form cannot
write (attendees, status, reminder methods) are excluded so sync noise
can't fake a conflict.
A **dropped** event gets no conflict dialog, deliberately. Its blast radius is
already bounded by the same dirty check — only `ALL_DAY`, `EVENT_TIMEZONE`,
`DTSTART` and `DTEND`/`DURATION`/`RRULE` are written — so a concurrent remote
edit to the title, notes or guests survives untouched. What a drop *can* clobber
is a concurrent remote **time** change, and parking a one-gesture action behind a
modal would cost more than that case is worth; the undo on the confirmation chip
is the answer instead. Undo restores semantics, not the row's byte
shape (`DURATION` normalises to `P<n>S`/`P<n>D`, `EVENT_TIMEZONE` is stamped
concrete), and it is offered only where the inverse is one symmetric write — a
one-off event or a whole-series shift. *This event* leaves an exception row
behind and *this and following* splits the series; neither is undone by shifting
back, so both get a plain confirmation. Two further gaps, both narrow and
accepted: a shift whose *anchor* crosses a DST gap is not invertible in wall
clock (the −Δ normalises back to where it started), and an undo after a
concurrent remote time change overwrites it, exactly as the forward move would.
## Reminder delivery
Calendula plans and fires its own reminders. It reads the offsets in