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package layers
import (
"container/list"
"errors"
"image"
"image/draw"
"github.com/faiface/gui/event"
)
type ImageFlusher interface {
Image() *image.RGBA
Flush(r image.Rectangle)
}
type List struct {
event.Dispatch
dst ImageFlusher
layers list.List
}
func (l *List) Dst(dst ImageFlusher) {
l.dst = dst
for e := l.layers.Back(); e != nil; e = e.Prev() {
layer := e.Value.(*Layer)
rgba := image.NewRGBA(dst.Image().Bounds())
draw.Draw(rgba, layer.rgba.Bounds(), layer.rgba, layer.rgba.Bounds().Min, draw.Src)
layer.rgba = rgba
}
}
func (l *List) Push() *Layer {
layer := &Layer{
l: l,
rgba: image.NewRGBA(l.dst.Image().Bounds()),
}
layer.e = l.layers.PushFront(layer)
return layer
}
func (l *List) Flush(r image.Rectangle) {
if l.dst == nil {
panic(errors.New("layer: Flush: no destination"))
}
draw.Draw(l.dst.Image(), r, image.Transparent, r.Min, draw.Src)
for e := l.layers.Back(); e != nil; e = e.Prev() {
layer := e.Value.(*Layer)
draw.Draw(l.dst.Image(), r, layer.rgba, r.Min, draw.Over)
}
l.dst.Flush(r)
}
func (l *List) Happen(event string) bool {
if l.Dispatch.Happen(event) {
return true
}
for e := l.layers.Front(); e != nil; e = e.Next() {
layer := e.Value.(*Layer)
if layer.Happen(event) {
return true
}
}
return false
}
type Layer struct {
event.Dispatch
l *List
e *list.Element
rgba *image.RGBA
}
func (l *Layer) Remove() {
l.l.layers.Remove(l.e)
}
func (l *Layer) Front() {
l.l.layers.MoveToFront(l.e)
}
func (l *Layer) Image() *image.RGBA {
return l.rgba
}
func (l *Layer) Flush(r image.Rectangle) {
l.l.Flush(r)
}
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