[vtkusers] wxVTKRenderWindowInteractor and wxPython 2.5.2.8

[Mathieu Malaterre]

Sander Niemeijer wrote:
>> I haven't looked at it in any detail so am just as clueless.  I will
>> need to spend some time on it to figure out what is wrong.  I'd
>> probably start with the smallest case that works and build on that.
> 
> 
> Yesterday I tried to figure out what the actual change was that made it 
> work in wxPython 2.4.2.4, but made it stop working with 2.5.2.8. I think 
> I have found the problem.
> 
> It seems that wxPython is not just wrapping the wxWindow.GetHandle() 
> function, but providing its own implementation (see the GetHandle() 
> wrapping in wxPythonSrc-2.5.2.8/wxPython/src/_window.i which calls 
> wxPyGetWinHandle() in wxPythonSrc-2.5.2.8/wxPython/src/helpers.cpp).
> 
> The implementation of the wxPyGetWinHandle() function seems to have been 
> changed, such that it now returns the XWindow handle for 'm_widget' 
> instead of 'm_wxwindow'. My understanding of Gtk is that a wx window 
> consists of one or more Gtk windows, with m_widget being some kind of 
> container Gtk window and m_wxwindow the Gtk window that should be used 
> for drawing. So with the new wxPython we are getting the wrong Gtk 
> XWindow handle to do the drawing.
> 
> I'll post an e-mail on the wxPython mailinglist to ask why they made the 
> changes they did and see if we can get it fixed somehow.
> 
> On a side note: Has anybody ever tried to get the 
> wxVTKRenderWindowInteractor working for Mac? I saw that Mathieu has some 
> C++ version of wxVTK on his website, that looks like it supports Mac 
> (both Cocoa and Carbon) but only using a top-level window handle. Any 
> reasons why sub-windows can't be supported (in our application the VTK 
> window is inside a splitter window)? Or has this just not been tried yet?

On a side note, wxVTK doesn't work on Cocoa yet(*). I am still 
struggling with those guys a wxWidget.

The funny thing is that in my implementation of GetHandle (I override 
the one provided in the tollkit). I extract the Xwindow pointer from the 
GTK window and pass it the the renderwindow... and I grabbed the code 
from the python module a year ago !

Mathieu
(*) I am not a Cocoa guru but it seems that vtkCocoaRW doesn't 
initialize properly and seg fault on some opengl code...