func draw(widget Widget, gc graphic.Context, clip geom.Rect, origin geom.Point) {
bounds := widget.Bounds()
if clip.Intersect(geom.Rect{
X: bounds.X + origin.X,
Y: bounds.Y + origin.Y,
W: bounds.W,
H: bounds.H,
}).Empty() {
return
}
gc.Save()
gc.Configure(graphic.State{
Transform: graphic.Translation(bounds.X, bounds.Y),
Clip: geom.Rect{W: bounds.W, H: bounds.H},
})
if d, ok := widget.(Drawable); ok {
d.Draw(gc)
}
if c, ok := widget.(Container); ok {
origin = bounds.Origin()
for _, w := range c.Children() {
draw(w, gc, clip, origin)
}
}
gc.Restore()
}
