[vtkusers] wxVTKRenderWindow: magic --sync
Mathieu.Malaterre at creatis.insa-lyon.fr
Wed Apr 9 09:39:54 EDT 2003
I swear I didn't hide anything in my pockets but on the contrary
I would be very gratfull to anyone that could find the trick. I also
apologize for all the cross posting.
This is a **long** email. Please bear with me. I was in touch with Vadim
Zeitlin about this problem but failed to produce a simple example that
didn't make use of VTK. Basically VTK is a layer that abstract OpenGL stuff.
* Description of the problem;
I am using wxVTKRenderWindow into my project and found a naughty
behavior when draging the mouse out of the VTK window and dropping the
mouse on top of let say the satus bar. While browsing the python source
code, I understood this came from a bug in wxGTK prior to 2.3.2. As I am
using wxGTK 2.4.0 I thought this bug was fixed.
So I modified the python source file:
line 71, I changed:
WX_USE_X_CAPTURE = 0
WX_USE_X_CAPTURE = 1
and I added a status bar to the main frame. You can download this
modfied version from:
Then you can start the script like this (don't forget '--sync' option):
$python wxVTKRenderWindowInteractor.py --sync
You'll see that everything is working properly. Even the drag and drop
on the status bar (for not convinced people you can turn back
WX_USE_X_CAPTURE = 0 and see that the status bar makes users loose the
Now comes the magic part. Start this script again *without* the --sync
if you click *without* moving the mouse, everything should go smoothly.
But then, try again and drag the mouse to the status bar...
yeah you lost the mouse event! You need to kill this app from a ssh
I haven't been able to reproduce this bug on wxGTK prior to 2.3.2. There
was a big change from 2.3.1 to 2.3.2 that's why it is a bit hard for me
to track down the modification that only deal with my problem.
As I don't believe anymore in magical stuff, I decide to hack down the
wxPython source and found that the '--sync' option was only there to
active an XSynchronize event. So I tried to modify the
I uncommented the XSynchronize (line 867), but this didn't make any
change. Whereas the '--sync' was still working.
Any X11 guru comment on that ?
Linux RedHat 7.3
VTK 4.3 (fresh CVS)
thank you all for reading me,
ps: If you've reach this far, you are a very patient guy !
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