PlacementLayerScope

The properties of the layer PlacementScope.placeWithLayer places a child with, which its layerBlock sets, as androidx's GraphicsLayerScope does for a graphics layer.

The layer covers the placed box: the size the child measured to where a MeasurePolicy places it, or the size the content reports where a layout modifier places it. What it paints past the layout bounds grows the component's paint outsets. A state read in the block repaints the component without measuring it again; where the paint outsets it takes resize a Foundation container, that container places its children again. Each run of the block starts from the defaults, so a property the block leaves unset paints at its default.

Under a Foundation container, mouse input reaches what a rotation or a scale paints under the pointer, at the point in the target's own coordinates. Tooltips and popups the content opens stand where they would stand without the layer.