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Compose Modifier

fillMaxHeight

Have the content fill (possibly only partially) the Constraints.maxHeight of the incoming measurement constraints, by setting the minimum height and the maximum height to be equal to the maximum height multiplied by fraction.

SimpleFillHeightModifier

@Sampled
@Composable
fun SimpleFillHeightModifier() {
    Box(Modifier.fillMaxHeight().background(Color.Red), contentAlignment = Alignment.Center) {
        Box(Modifier.size(100.dp).background(color = Color.Magenta))
    }
}

FillHalfHeightModifier

@Sampled
@Composable
fun FillHalfHeightModifier() {
    Box(Modifier.requiredSize(100.dp).background(Color.Red), contentAlignment = Alignment.Center) {
        // The inner Box will be (30.dp x 50.dp).
        Box(Modifier.requiredWidth(30.dp).fillMaxHeight(0.5f).background(color = Color.Magenta))
    }
}