x/canvasbox.go

package x

import "git.tebibyte.media/tomo/tomo"
import "git.tebibyte.media/tomo/tomo/canvas"

type canvasBox struct {
	*box
	userDrawer canvas.Drawer
}

func (backend *Backend) NewCanvasBox () tomo.CanvasBox {
	this    := &canvasBox { }
	this.box = backend.newBox(this)
	this.drawer = this
	return this
}

func (this *canvasBox) Box () tomo.Box {
	return this
}

func (this *canvasBox) SetDrawer (drawer canvas.Drawer) {
	this.userDrawer = drawer
	this.invalidateDraw()
}

func (this *canvasBox) Invalidate () {
	this.invalidateDraw()
}

func (this *canvasBox) Draw (can canvas.Canvas) {
	this.box.Draw(can)
	this.userDrawer.Draw (
		can.SubCanvas(this.padding.Apply(this.innerClippingBounds)))
}