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racket/gui gtk: fix canvas/panel border drawing

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The code to draw a border has to determine the widget's position
within the drawing window. Gtk 3.0 has a function to provide that
transformation, but Gtk 2.0 doesn't seem to have one, and it seems
that the transformation implemented in `racket/gui' wasn't right.

Closes PR 13453
This commit is contained in:
Matthew Flatt 2013-01-25 14:16:51 -07:00 committed by Matthew Flatt
parent 86203467a4
commit e22977667d
1 changed files with 7 additions and 3 deletions
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10
collects/mred/private/wx/gtk/panel.rkt
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@ -38,11 +38,15 @@
(let* ([a (widget-allocation gtk)]
[w (sub1 (GtkAllocation-width a))]
[h (sub1 (GtkAllocation-height a))])
(let loop ([gtk gtk] [x 0] [y 0])
(if (not (zero? (bitwise-and (get-gtk-object-flags gtk) GTK_NO_WINDOW)))
(let loop ([gtk gtk] [x 0] [y 0] [can-super? #t])
(if (and can-super?
(not (zero? (bitwise-and (get-gtk-object-flags gtk) GTK_NO_WINDOW))))
;; no window:
(let ([a (widget-allocation gtk)])
(loop (widget-parent gtk) (+ x (GtkAllocation-x a)) (+ y (GtkAllocation-y a))))
(loop (widget-parent gtk) (+ x (GtkAllocation-x a)) (+ y (GtkAllocation-y a))
;; It seems that a widget's allocation is with respect
;; to a window, not its parent.
#f))
;; found window:
(gdk_draw_rectangle win gc #f x y w h))))
(gdk_gc_unref gc)))