本文介绍了在Jetpack Compose中为自定义手势添加涟漪效果的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我尝试在Jetpack Compose中创建一个可点击的曲面,当用户点击该曲面时,标高会发生变化。以下代码已经运行:
var tapped by remember { mutableStateOf(false) }
val elevation by animateDpAsState(
targetValue = if (tapped) 0.dp else 5.dp,
animationSpec = tween(50)
)
Surface(
shape = RoundedCornerShape(20.dp),
modifier = Modifier
.padding(16.dp)
.requiredSize(150.dp)
.pointerInput(Unit) {
detectTapGestures(onPress = {
tapped = true
tryAwaitRelease()
tapped = false
})
},
elevation = elevation
) {
...
}
然而,我希望在敲击过程中产生涟漪效应。我如何才能做到这一点?
默认按钮/表面onClick
和clickable
不适合,因为它只处理按下输入,而不处理点击。
推荐答案
使用Modifier.indication
添加涟漪效果,使用interactionSource
传递事件更新状态如下:
var tapped by remember { mutableStateOf(false) }
val interactionSource = remember { MutableInteractionSource() }
Surface(
modifier = Modifier
.indication(interactionSource, LocalIndication.current)
.pointerInput(Unit) {
detectTapGestures(onPress = { offset ->
tapped = true
val press = PressInteraction.Press(offset)
interactionSource.emit(press)
tryAwaitRelease()
interactionSource.emit(PressInteraction.Release(press))
tapped = false
})
}
) {
}
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