backend/internal/system/canvasbox.go

36 lines
735 B
Go

package system
import "git.tebibyte.media/tomo/tomo"
import "git.tebibyte.media/tomo/tomo/canvas"
type canvasBox struct {
*box
userDrawer canvas.Drawer
}
func (this *System) NewCanvasBox () tomo.CanvasBox {
box := &canvasBox { }
box.box = this.newBox(box)
box.drawer = box
return box
}
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) {
if can == nil { return }
this.box.Draw(can)
if this.userDrawer != nil {
padding := tomo.Inset(this.attrPadding.Value())
this.userDrawer.Draw (
can.SubCanvas(padding.Apply(this.innerClippingBounds)))
}
}