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* Update Jetpack libraries * Update to compose 1.7.0-beta02
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98
feature/theater/src/main/java/soup/movie/feature/theater/edit/PagerTab.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,98 @@ | ||
| /* | ||
| * Copyright 2024 SOUP | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * https://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
| package soup.movie.feature.theater.edit | ||
|
|
||
| import androidx.compose.foundation.pager.HorizontalPager | ||
| import androidx.compose.foundation.pager.PagerState | ||
| import androidx.compose.foundation.pager.VerticalPager | ||
| import androidx.compose.material.ScrollableTabRow | ||
| import androidx.compose.material.TabPosition | ||
| import androidx.compose.material.TabRow | ||
| import androidx.compose.ui.Modifier | ||
| import androidx.compose.ui.layout.layout | ||
| import androidx.compose.ui.unit.Constraints | ||
| import androidx.compose.ui.unit.lerp | ||
|
|
||
| /** | ||
| * From https://github.com/google/accompanist/tree/main/pager-indicators | ||
| * | ||
| * This indicator syncs up a [TabRow] or [ScrollableTabRow] tab indicator with a | ||
| * [HorizontalPager] or [VerticalPager]. | ||
| */ | ||
| fun Modifier.pagerTabIndicatorOffset( | ||
| pagerState: PagerState, | ||
| tabPositions: List<TabPosition>, | ||
| pageIndexMapping: (Int) -> Int = { it }, | ||
| ): Modifier { | ||
| val stateBridge = object : PagerStateBridge { | ||
| override val currentPage: Int | ||
| get() = pagerState.currentPage | ||
| override val currentPageOffset: Float | ||
| get() = pagerState.currentPageOffsetFraction | ||
| } | ||
|
|
||
| return pagerTabIndicatorOffset(stateBridge, tabPositions, pageIndexMapping) | ||
| } | ||
|
|
||
| private fun Modifier.pagerTabIndicatorOffset( | ||
| pagerState: PagerStateBridge, | ||
| tabPositions: List<TabPosition>, | ||
| pageIndexMapping: (Int) -> Int = { it }, | ||
| ): Modifier = layout { measurable, constraints -> | ||
| if (tabPositions.isEmpty()) { | ||
| // If there are no pages, nothing to show | ||
| layout(constraints.maxWidth, 0) {} | ||
| } else { | ||
| val currentPage = minOf(tabPositions.lastIndex, pageIndexMapping(pagerState.currentPage)) | ||
| val currentTab = tabPositions[currentPage] | ||
| val previousTab = tabPositions.getOrNull(currentPage - 1) | ||
| val nextTab = tabPositions.getOrNull(currentPage + 1) | ||
| val fraction = pagerState.currentPageOffset | ||
| val indicatorWidth = if (fraction > 0 && nextTab != null) { | ||
| lerp(currentTab.width, nextTab.width, fraction).roundToPx() | ||
| } else if (fraction < 0 && previousTab != null) { | ||
| lerp(currentTab.width, previousTab.width, -fraction).roundToPx() | ||
| } else { | ||
| currentTab.width.roundToPx() | ||
| } | ||
| val indicatorOffset = if (fraction > 0 && nextTab != null) { | ||
| lerp(currentTab.left, nextTab.left, fraction).roundToPx() | ||
| } else if (fraction < 0 && previousTab != null) { | ||
| lerp(currentTab.left, previousTab.left, -fraction).roundToPx() | ||
| } else { | ||
| currentTab.left.roundToPx() | ||
| } | ||
| val placeable = measurable.measure( | ||
| Constraints( | ||
| minWidth = indicatorWidth, | ||
| maxWidth = indicatorWidth, | ||
| minHeight = 0, | ||
| maxHeight = constraints.maxHeight, | ||
| ), | ||
| ) | ||
| layout(constraints.maxWidth, maxOf(placeable.height, constraints.minHeight)) { | ||
| placeable.placeRelative( | ||
| indicatorOffset, | ||
| maxOf(constraints.minHeight - placeable.height, 0), | ||
| ) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| internal interface PagerStateBridge { | ||
| val currentPage: Int | ||
| val currentPageOffset: Float | ||
| } |
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