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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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/* | ||
* 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 | ||
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||
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 | ||
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/** | ||
* 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 | ||
} | ||
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return pagerTabIndicatorOffset(stateBridge, tabPositions, pageIndexMapping) | ||
} | ||
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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), | ||
) | ||
} | ||
} | ||
} | ||
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internal interface PagerStateBridge { | ||
val currentPage: Int | ||
val currentPageOffset: Float | ||
} |
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