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chenzhang2006/BackdropAlpha.kt

Created March 30, 2022 20:20
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Animate Alpha
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BackdropAlpha.kt
val backdropState = rememberBackdropScaffoldState(BackdropValue.Concealed)
val offset by backdropState.offset
val halfHeightDp = LocalConfiguration.current.screenHeightDp / 2
val halfHeightPx = with(LocalDensity.current) { halfHeightDp.dp.toPx() }
//...
// Current alpha for vertical list
val verticalListAlpha = ((halfHeightPx - offset) / halfHeightPx).coerceIn(0f..1f)
// Current alpha for horizontal list
val horizontalListAlpha = (offset / halfHeightPx).coerceIn(0f..1f)
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