Remove unused class HorizontalTabPager
This commit is contained in:
vfsfitvnm
@@ -1,172 +0,0 @@
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package it.vfsfitvnm.vimusic.ui.components
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import androidx.compose.animation.core.Animatable
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import androidx.compose.animation.core.FastOutSlowInEasing
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import androidx.compose.animation.core.calculateTargetValue
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import androidx.compose.animation.core.tween
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import androidx.compose.animation.splineBasedDecay
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import androidx.compose.foundation.ExperimentalFoundationApi
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import androidx.compose.foundation.gestures.detectHorizontalDragGestures
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import androidx.compose.foundation.lazy.layout.LazyLayout
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import androidx.compose.foundation.lazy.layout.LazyLayoutItemProvider
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import androidx.compose.runtime.*
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import androidx.compose.ui.Modifier
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import androidx.compose.ui.draw.clipToBounds
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import androidx.compose.ui.input.pointer.pointerInput
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import androidx.compose.ui.input.pointer.util.VelocityTracker
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import androidx.compose.ui.input.pointer.util.addPointerInputChange
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import kotlinx.coroutines.launch
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import kotlin.math.absoluteValue
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@Stable
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class TabPagerState(
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val pageCount: Int,
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val initialPageIndex: Int,
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) {
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var pageIndex by mutableStateOf(initialPageIndex)
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var tempPageIndex: Int? = null
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val animatable = Animatable(0f)
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val offset by animatable.asState()
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fun updateBounds(lowerBound: Float, upperBound: Float) {
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animatable.updateBounds(lowerBound, upperBound)
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}
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suspend fun animateScrollTo(newPageIndex: Int) {
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tempPageIndex = newPageIndex
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if (newPageIndex > pageIndex) {
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animatable.animateTo(
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animatable.upperBound!!, tween(
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durationMillis = 300,
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easing = FastOutSlowInEasing
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)
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)
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} else if (newPageIndex < pageIndex) {
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animatable.animateTo(
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animatable.lowerBound!!, tween(
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durationMillis = 300,
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easing = FastOutSlowInEasing
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)
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)
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}
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pageIndex = newPageIndex
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animatable.snapTo(0f)
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tempPageIndex = null
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}
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}
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@Composable
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fun rememberTabPagerState(initialPageIndex: Int, pageCount: Int): TabPagerState {
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return remember {
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TabPagerState(
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pageCount = pageCount,
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initialPageIndex = initialPageIndex,
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)
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}
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}
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@OptIn(ExperimentalFoundationApi::class)
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@Composable
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fun HorizontalTabPager(
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state: TabPagerState,
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modifier: Modifier = Modifier,
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content: @Composable (index: Int) -> Unit
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) {
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val coroutineScope = rememberCoroutineScope()
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val itemProvider = remember(state) {
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object : LazyLayoutItemProvider {
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override val itemCount = state.pageCount
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@Composable
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override fun Item(index: Int) = content(index)
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}
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}
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LazyLayout(
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itemProvider = itemProvider,
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modifier = modifier
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.clipToBounds()
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.pointerInput(state) {
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val velocityTracker = VelocityTracker()
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val decay = splineBasedDecay<Float>(this)
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detectHorizontalDragGestures(
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onHorizontalDrag = { change, dragAmount ->
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velocityTracker.addPointerInputChange(change)
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coroutineScope.launch {
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state.animatable.snapTo(state.offset - dragAmount)
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}
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},
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onDragEnd = {
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val velocity = -velocityTracker.calculateVelocity().x
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val initialTargetValue =
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decay.calculateTargetValue(state.offset, velocity)
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velocityTracker.resetTracking()
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coroutineScope.launch {
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val isEnough = initialTargetValue.absoluteValue > size.width / 2
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if (initialTargetValue > 0) {
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state.animatable.animateTo(
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targetValue = if (isEnough) size.width.toFloat() else 0f,
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initialVelocity = if (isEnough) velocity else 0f
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)
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if (isEnough) {
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state.pageIndex = state.pageIndex
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.plus(1)
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.coerceAtMost(state.pageCount - 1)
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state.animatable.snapTo(0f)
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}
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} else {
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state.animatable.animateTo(
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targetValue = if (isEnough) -size.width.toFloat() else 0f,
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initialVelocity = if (isEnough) velocity else 0f
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)
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if (isEnough) {
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state.pageIndex = state.pageIndex
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.minus(1)
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.coerceAtLeast(0)
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state.animatable.snapTo(0f)
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}
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}
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}
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}
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)
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}
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) { constraints ->
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val previousPlaceable = state.offset.takeIf { it < 0 }?.let {
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(state.tempPageIndex ?: (state.pageIndex - 1)).takeIf { it >= 0 }?.let { index ->
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measure(index, constraints).first()
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}
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}
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val placeable = measure(state.pageIndex, constraints).first()
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val nextPlaceable = state.offset.takeIf { it > 0 }?.let {
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(state.tempPageIndex ?: (state.pageIndex + 1)).takeIf { it < state.pageCount }
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?.let { index ->
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measure(index, constraints).first()
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}
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}
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state.updateBounds(
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lowerBound = if (state.pageIndex == 0) 0f else -constraints.maxWidth.toFloat(),
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upperBound = if (state.pageIndex == state.pageCount - 1) 0f else constraints.maxWidth.toFloat()
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)
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layout(width = constraints.maxWidth, height = constraints.maxHeight) {
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previousPlaceable?.let {
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previousPlaceable.place(x = -state.offset.toInt() - constraints.maxWidth, y = 0)
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placeable.place(x = -state.offset.toInt(), y = 0)
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} ?: nextPlaceable?.let {
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placeable.place(x = -state.offset.toInt(), y = 0)
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nextPlaceable.place(x = -state.offset.toInt() + constraints.maxWidth, y = 0)
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} ?: placeable.place(x = -state.offset.toInt(), y = 0)
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}
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}
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}
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