61 lines
2.2 KiB
Kotlin
61 lines
2.2 KiB
Kotlin
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package eu.kanade.presentation.util
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import androidx.compose.animation.core.AnimationState
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import androidx.compose.animation.core.DecayAnimationSpec
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import androidx.compose.animation.core.animateDecay
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import androidx.compose.animation.rememberSplineBasedDecay
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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.runtime.Composable
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import androidx.compose.runtime.remember
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import androidx.compose.ui.MotionDurationScale
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import kotlinx.coroutines.withContext
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import kotlin.math.abs
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/**
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* FlingBehavior that always uses the default motion scale.
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*
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* This makes the scrolling animation works like View's lists
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* when "Remove animation" settings is on.
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*/
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@Composable
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fun flingBehaviorIgnoringMotionScale(): FlingBehavior {
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val flingSpec = rememberSplineBasedDecay<Float>()
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return remember(flingSpec) {
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DefaultFlingBehavior(flingSpec)
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}
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}
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private val DefaultMotionDurationScale = object : MotionDurationScale {
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// Use default motion scale factor
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override val scaleFactor: Float = 1f
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}
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private class DefaultFlingBehavior(
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private val flingDecay: DecayAnimationSpec<Float>,
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) : FlingBehavior {
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override suspend fun ScrollScope.performFling(initialVelocity: Float): Float {
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// come up with the better threshold, but we need it since spline curve gives us NaNs
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return if (abs(initialVelocity) > 1f) {
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var velocityLeft = initialVelocity
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var lastValue = 0f
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withContext(DefaultMotionDurationScale) {
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AnimationState(
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initialValue = 0f,
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initialVelocity = initialVelocity,
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).animateDecay(flingDecay) {
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val delta = value - lastValue
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val consumed = scrollBy(delta)
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lastValue = value
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velocityLeft = this.velocity
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// avoid rounding errors and stop if anything is unconsumed
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if (abs(delta - consumed) > 0.5f) this.cancelAnimation()
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}
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}
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velocityLeft
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} else {
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initialVelocity
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}
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}
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}
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