[ wxwindows-Bugs-1705685 ] MSW/GTK paint differences

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Bugs item #1705685, was opened at 2007-04-23 01:41
Message generated for change (Settings changed) made by oneeyeman
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>Category: wxMSW specific
>Group: Platform specific
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: ONEEYEMAN (oneeyeman)
Assigned to: Nobody/Anonymous (nobody)
Summary: MSW/GTK paint differences

Initial Comment:
Hi, ALL,
Attached please find 2 screenshots about different behavior between MSW and GTK running same code, which is also attached.

I believe that this is bug in MSW code.

However, for some reason GTK also has a problem: dc is transparent, but I see the white space between "focus" rectangle and the bitmap.

I'm using 2.8.1 on WinXP and Gentoo Linux/GNOME/gcc-4.

Please comment, even if it will be "upgrade to the latest stable and test" ;-)

Thank you.

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Comment By: ONEEYEMAN (oneeyeman)
Date: 2007-04-24 07:40

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Robert,
According to the code, wxGTK produces correct results, and wxMSW does
not.
I'm trying to paint a "focus rectangle" around a static bitmap. I'm not
trying to paint on the bitmap (i.e. "native control), if I understood you
correctly.

Thank you.

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Comment By: Robert Roebling (roebling)
Date: 2007-04-24 02:50

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You cannot just draw over an existing native control under GTK+. I
remember this is somehow possible with Win23 and getting the control client
dc may indeed work, but this is not portable. You can draw *around* the
control by catching the paint event of the underlying window/panel/dialog.

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Comment By: ONEEYEMAN (oneeyeman)
Date: 2007-04-23 22:22

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I just tried to use paint dc instead of client dc with the MSW version.
There is no rectangle.
I also tried to create the client dc out of the dialog itself. Same
result.

Thank you.

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Comment By: ONEEYEMAN (oneeyeman)
Date: 2007-04-23 10:07

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Thank you, Robert. I was missing the transparency of the brush.
However, what do I do to make the code work on both platform the same?



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Comment By: Robert Roebling (roebling)
Date: 2007-04-23 02:24

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You cannot just get the DC of a native control under wxGTK. It may happen
to work (it may work here), but this is in general not supported. Also, you
need to call dc.SetBrush( *wxTRANSPARENT_BRUSH ) not any background mode.

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Comment By: ONEEYEMAN (oneeyeman)
Date: 2007-04-23 01:48

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File Added: test.cpp

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Comment By: ONEEYEMAN (oneeyeman)
Date: 2007-04-23 01:46

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File Added: test.h

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Comment By: ONEEYEMAN (oneeyeman)
Date: 2007-04-23 01:44

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File Added: test_gtk.PNG

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