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Derive day coordinates from item root layout
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72 changes: 23 additions & 49 deletions
72
...tform/library/src/commonMain/kotlin/com/kizitonwose/calendar/compose/ItemPlacementInfo.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,84 +1,58 @@ | ||
| package com.kizitonwose.calendar.compose | ||
|
|
||
| import androidx.compose.foundation.gestures.Orientation | ||
| import androidx.compose.runtime.Immutable | ||
| import androidx.compose.runtime.Stable | ||
| import androidx.compose.runtime.withFrameNanos | ||
| import androidx.compose.ui.geometry.Offset | ||
| import androidx.compose.ui.layout.LayoutCoordinates | ||
| import androidx.compose.ui.layout.positionInWindow | ||
| import androidx.compose.ui.unit.round | ||
| import kotlinx.coroutines.isActive | ||
| import kotlin.coroutines.coroutineContext | ||
|
|
||
| @Immutable | ||
| internal data class ItemCoordinates( | ||
| val itemRootCoordinates: LayoutCoordinates, | ||
| val firstDayCoordinates: LayoutCoordinates, | ||
| ) | ||
|
|
||
| @Stable | ||
| internal class ItemPlacementInfo { | ||
| private var calendarCoordinates: LayoutCoordinates? = null | ||
| private var firstDayCoordinates: LayoutCoordinates? = null | ||
|
|
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| fun onCalendarPlaced(coordinates: LayoutCoordinates) { | ||
| calendarCoordinates = coordinates | ||
| } | ||
| private var itemCoordinates: ItemCoordinates? = null | ||
|
|
||
| fun onFirstDayPlaced(coordinates: LayoutCoordinates) { | ||
| firstDayCoordinates = coordinates | ||
| fun onItemPlaced(itemCoordinates: ItemCoordinates) { | ||
| this.itemCoordinates = itemCoordinates | ||
| } | ||
|
|
||
| suspend fun awaitFistDayOffsetAndSize(orientation: Orientation): DayOffsetSize? { | ||
| var calendarCoord: LayoutCoordinates? = null | ||
| var firstDayCoord: LayoutCoordinates? = null | ||
| while (coroutineContext.isActive && | ||
| (calendarCoord == null || firstDayCoord == null) | ||
| ) { | ||
| calendarCoord = calendarCoordinates | ||
| firstDayCoord = firstDayCoordinates | ||
| if (calendarCoord == null || firstDayCoord == null) { | ||
| withFrameNanos {} | ||
| } | ||
| suspend fun awaitFistDayOffsetAndSize(orientation: Orientation): OffsetSize? { | ||
| var itemCoordinates = this.itemCoordinates | ||
| while (coroutineContext.isActive && itemCoordinates == null) { | ||
| withFrameNanos {} | ||
| itemCoordinates = this.itemCoordinates | ||
| } | ||
| if (calendarCoord == null || | ||
| firstDayCoord == null || | ||
| !calendarCoord.isAttached || | ||
| !firstDayCoord.isAttached | ||
| ) { | ||
| if (itemCoordinates == null) { | ||
| return null | ||
| } | ||
| val itemViewCoord = findItemViewCoordinates(firstDayCoord, calendarCoord) | ||
| val daySize = firstDayCoord.size | ||
| val dayOffset = itemViewCoord.localPositionOf(firstDayCoord, Offset.Zero).round() | ||
| val (itemRootCoordinates, firstDayCoordinates) = itemCoordinates | ||
| val daySize = firstDayCoordinates.size | ||
| val dayOffset = itemRootCoordinates.localPositionOf(firstDayCoordinates).round() | ||
| return when (orientation) { | ||
| Orientation.Vertical -> DayOffsetSize( | ||
| Orientation.Vertical -> OffsetSize( | ||
| offset = dayOffset.y, | ||
| size = daySize.height, | ||
| ) | ||
|
|
||
| Orientation.Horizontal -> { | ||
| DayOffsetSize( | ||
| OffsetSize( | ||
| offset = dayOffset.x, | ||
| size = daySize.width, | ||
| ) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| internal data class DayOffsetSize( | ||
| @Immutable | ||
| internal data class OffsetSize( | ||
| val offset: Int, | ||
| val size: Int, | ||
| ) | ||
| } | ||
|
|
||
| internal fun findItemViewCoordinates( | ||
| firstDayCoord: LayoutCoordinates, | ||
| calendarCoord: LayoutCoordinates, | ||
| ): LayoutCoordinates { | ||
| var itemViewCoord = firstDayCoord | ||
| var parent = itemViewCoord.parentLayoutCoordinates | ||
| // Find the coordinates that match the index item layout | ||
| while (parent != null && | ||
| parent.size != calendarCoord.size && | ||
| parent.positionInWindow() != calendarCoord.positionInWindow() | ||
| ) { | ||
| itemViewCoord = parent | ||
| parent = itemViewCoord.parentLayoutCoordinates | ||
| } | ||
| return itemViewCoord | ||
| } |
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