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48 lines
1.5 KiB
Kotlin
48 lines
1.5 KiB
Kotlin
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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package org.mozilla.fenix.compose
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import androidx.compose.foundation.gestures.FlingBehavior
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import androidx.compose.foundation.gestures.ScrollScope
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import androidx.compose.foundation.lazy.LazyListState
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import androidx.compose.foundation.lazy.LazyRow
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import androidx.compose.runtime.Composable
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import androidx.compose.runtime.rememberCoroutineScope
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import kotlinx.coroutines.CoroutineScope
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import kotlinx.coroutines.launch
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/**
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* [FlingBehavior] for a [LazyRow] that will automatically scroll the list in the fling direction
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* to fully show the next item.
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*/
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@Composable
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fun EagerFlingBehavior(
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lazyRowState: LazyListState
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): FlingBehavior {
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val scope = rememberCoroutineScope()
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return LazyListEagerFlingBehavior(lazyRowState, scope)
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}
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private class LazyListEagerFlingBehavior(
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private val lazyRowState: LazyListState,
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private val scope: CoroutineScope
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) : FlingBehavior {
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override suspend fun ScrollScope.performFling(initialVelocity: Float): Float {
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val firstItemIndex = lazyRowState.firstVisibleItemIndex
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val itemIndexToScrollTo = when (initialVelocity <= 0) {
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true -> firstItemIndex
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false -> firstItemIndex + 1
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}
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scope.launch {
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lazyRowState.animateScrollToItem(itemIndexToScrollTo)
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}
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return 0f // we've consumed the entire fling
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}
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}
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