outer

type Attachable interface {
	Attached() bool
	Attach()
	Detach()
	OnAttach(func()) gxui.EventSubscription
	OnDetach(func()) gxui.EventSubscription
}

type Draw interface {
	Draw() gxui.Canvas
}

type IsVisibler interface {
	IsVisible() bool
}

type Layout interface {
	Layout(math.Rect)
}

type LayoutChildren interface {
	LayoutChildren()
}

type PaintChilder interface {
	PaintChild(c gxui.Canvas, child *gxui.Child, idx int)
}

type Painter interface {
	Paint(gxui.Canvas)
}

type Parenter interface {
	Parent() gxui.Parent
}

type Redrawer interface {
	Redraw()
}

type Relayouter interface {
	Relayout()
}

type Sized interface {
	Size() math.Size
	SetSize(math.Size)
}