package ui import ( "git.kirsle.net/go/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. } }