/
widget.go
86 lines (69 loc) · 1.24 KB
/
widget.go
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package rat
type Widget interface {
SetBox(Box)
GetBox() Box
Render()
HandleEvent([]keyEvent) bool
Destroy()
}
type WidgetStack interface {
Widget
Push(w Widget)
Pop() Widget
Size() int
}
type widgetStack struct {
lastEl *widgetStackElement
box Box
size int
}
type widgetStackElement struct {
widget Widget
previous *widgetStackElement
}
func NewWidgetStack() WidgetStack {
return &widgetStack{}
}
func (ws *widgetStack) Push(w Widget) {
ws.lastEl = &widgetStackElement{w, ws.lastEl}
ws.size++
ws.layout()
}
func (ws *widgetStack) Pop() Widget {
if ws.lastEl == nil {
return nil
}
w := ws.lastEl.widget
ws.lastEl = ws.lastEl.previous
ws.size--
w.Destroy()
return w
}
func (ws *widgetStack) Size() int {
return ws.size
}
func (ws *widgetStack) SetBox(b Box) {
ws.box = b
ws.layout()
}
func (ws *widgetStack) GetBox() Box {
return ws.box
}
func (ws *widgetStack) Render() {
if ws.lastEl != nil {
ws.lastEl.widget.Render()
}
}
func (ws *widgetStack) HandleEvent(ks []keyEvent) bool {
return ws.lastEl.widget.HandleEvent(ks)
}
func (ws *widgetStack) Destroy() {
for ws.size > 0 {
ws.Pop()
}
}
func (ws *widgetStack) layout() {
for e := ws.lastEl; e != nil; e = e.previous {
e.widget.SetBox(ws.box)
}
}