Layout / Modifier.layout

概念

三件套不够时，自定义测量与放置。成本高，主线优先嵌套 Column/Row/Box。

Modifier.layout { measurable, constraints ->
    val placeable = measurable.measure(constraints)
    layout(placeable.width, placeable.height) {
        placeable.place(0, 0)
    }
}

Canvas / drawBehind

自绘图表、装饰线。XML ≈ 自定义 View.onDraw。

Canvas(Modifier.size(100.dp)) {
    drawCircle(Color.Red, radius = size.minDimension / 2)
}