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