39 lines
745 B
Go
39 lines
745 B
Go
|
package ui
|
||
|
|
|
||
|
|
import "git.kirsle.net/apps/doodle/lib/render"
|
||
|
|
|
||
|
|
// AbsolutePosition computes a widget's absolute X,Y position on the
|
||
|
|
// window on screen by crawling its parent widget tree.
|
||
|
|
func AbsolutePosition(w Widget) render.Point {
|
||
|
|
abs := w.Point()
|
||
|
|
|
||
|
|
var (
|
||
|
|
node = w
|
||
|
|
ok bool
|
||
|
|
)
|
||
|
|
|
||
|
|
for {
|
||
|
|
node, ok = node.Parent()
|
||
|
|
if !ok { // reached the top of the tree
|
||
|
|
return abs
|
||
|
|
}
|
||
|
|
|
||
|
|
abs.Add(node.Point())
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// AbsoluteRect returns a Rect() offset with the absolute position.
|
||
|
|
func AbsoluteRect(w Widget) render.Rect {
|
||
|
|
var (
|
||
|
|
P = AbsolutePosition(w)
|
||
|
|
R = w.Rect()
|
||
|
|
)
|
||
|
|
return render.Rect{
|
||
|
|
X: P.X,
|
||
|
|
Y: P.Y,
|
||
|
|
W: R.W + P.X,
|
||
|
|
H: R.H, // TODO: the Canvas in EditMode lets you draw pixels
|
||
|
|
// below the status bar if we do `+ R.Y` here.
|
||
|
|
}
|
||
|
|
}
|