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* feat: overscroll effect. * fix: remove unused import directive.
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95 changes: 95 additions & 0 deletions
95
material/src/main/java/com/m3u/material/overscroll/OverScrollEffect.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,95 @@ | ||
| package com.m3u.material.overscroll | ||
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| import androidx.compose.animation.core.Animatable | ||
| import androidx.compose.animation.core.AnimationSpec | ||
| import androidx.compose.animation.core.SpringSpec | ||
| import androidx.compose.foundation.ExperimentalFoundationApi | ||
| import androidx.compose.foundation.LocalOverscrollConfiguration | ||
| import androidx.compose.foundation.MutatePriority | ||
| import androidx.compose.foundation.MutatorMutex | ||
| import androidx.compose.foundation.layout.Column | ||
| import androidx.compose.runtime.Composable | ||
| import androidx.compose.runtime.CompositionLocalProvider | ||
| import androidx.compose.runtime.LaunchedEffect | ||
| import androidx.compose.runtime.Stable | ||
| import androidx.compose.runtime.getValue | ||
| import androidx.compose.runtime.mutableStateOf | ||
| import androidx.compose.runtime.remember | ||
| import androidx.compose.runtime.rememberCoroutineScope | ||
| import androidx.compose.runtime.setValue | ||
| import androidx.compose.runtime.staticCompositionLocalOf | ||
| import androidx.compose.ui.Modifier | ||
| import androidx.compose.ui.input.nestedscroll.nestedScroll | ||
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| enum class OverScrollEffect { | ||
| Scale, | ||
| ScaleCenter, | ||
| ParallaxVertical, | ||
| ParallaxHorizontal, | ||
| Alpha, | ||
| RotationCenter, | ||
| RotationVertical, | ||
| RotationHorizontal, | ||
| Header, | ||
| } | ||
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| @Stable | ||
| class OverScrollState( | ||
| val maxOffset: Float = 400f, | ||
| private val animationSpec: AnimationSpec<Float> = SpringSpec(), | ||
| ) { | ||
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| private val _overScrollOffset = Animatable(0f) | ||
| private val mutatorMutex = MutatorMutex() | ||
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| val offSet: Float get() = _overScrollOffset.value | ||
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| val progress: Float get() = offSet / maxOffset | ||
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| var inOverScroll: Boolean by mutableStateOf(false) | ||
| internal set | ||
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| internal suspend fun animateOffsetTo(offset: Float) { | ||
| mutatorMutex.mutate { | ||
| _overScrollOffset.animateTo(offset, animationSpec) | ||
| } | ||
| } | ||
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| internal suspend fun dispatchOverScrollDelta(delta: Float) { | ||
| mutatorMutex.mutate(MutatePriority.UserInput) { | ||
| _overScrollOffset.snapTo(_overScrollOffset.value + delta) | ||
| } | ||
| } | ||
| } | ||
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| val LocalOverScrollState = staticCompositionLocalOf<OverScrollState> { error("Please provide OverScrollState") } | ||
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| @OptIn(ExperimentalFoundationApi::class) | ||
| @Composable | ||
| fun OverScroll( | ||
| modifier: Modifier = Modifier, | ||
| maxOffset: Float = 400f, | ||
| animationSpec: AnimationSpec<Float> = SpringSpec(), | ||
| content: @Composable () -> Unit, | ||
| ) { | ||
| val state: OverScrollState = remember { | ||
| OverScrollState(maxOffset, animationSpec) | ||
| } | ||
| val coroutineScope = rememberCoroutineScope() | ||
| val nestedScrollConnection = OverScrollNestedScrollConnection(state, coroutineScope) | ||
| LaunchedEffect(state.inOverScroll) { | ||
| if (!state.inOverScroll) { | ||
| // If there's not a swipe in progress, rest the indicator at 0f | ||
| state.animateOffsetTo(0f) | ||
| } | ||
| } | ||
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| CompositionLocalProvider( | ||
| LocalOverscrollConfiguration provides null, | ||
| LocalOverScrollState provides state | ||
| ) { | ||
| Column(modifier.nestedScroll(connection = nestedScrollConnection)) { | ||
| content() | ||
| } | ||
| } | ||
| } |
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