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win32: fix canvas% control border drawing

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Use the system-supplied region to intersect with the
window region, so that drawng the border doesn't replace
the window content.

See also Kieron Hardy's post on the users' list, 2/7/12.
This commit is contained in:
Matthew Flatt 2012-02-11 08:23:59 -07:00
parent 11389e7a8c
commit af62391c8c
1 changed files with 9 additions and 1 deletions
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10
collects/mred/private/wx/win32/canvas.rkt
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@ -41,6 +41,7 @@
(define-user32 GetDCEx (_wfun _HWND _HRGN _DWORD -> _HDC))
(define DCX_WINDOW #x00000001)
(define DCX_CACHE #x00000002)
(define DCX_INTERSECTRGN #x00000080)
(define EP_EDITTEXT 1)
(define ETS_NORMAL 1)
@ -205,7 +206,14 @@
(if control-border-theme
(let* ([r (GetWindowRect canvas-hwnd)]
[res (default w msg wParam lParam)]
[hdc (GetDCEx canvas-hwnd #f (bitwise-ior DCX_CACHE DCX_WINDOW))]
[hrgn (if (= wParam 1) ;; check is needed for Win7
#f
(cast wParam _intptr _HRGN))]
[hdc (GetDCEx canvas-hwnd hrgn
(bitwise-ior DCX_CACHE DCX_WINDOW
(if hrgn
DCX_INTERSECTRGN
0)))]
[wr (make-RECT 0 0
(- (RECT-right r) (RECT-left r))
(- (RECT-bottom r) (RECT-top r)))])