[pygtk] Making part of a GTK-window transparent and position another window behind

[Christoph David Hermann]

Hi John,

thanks for your answer.

I found an article on 
http://mikehearn.wordpress.com/2006/03/26/gtk-windows-with-alpha-channels/ 
which uses only alpha channels, no mask and no set_opacity for window 
transparency. I'll give this a try.

Additionally, I have this strange feeling that alpha channels and 
opacity aren't supported by GTK on MS windows platforms.

Christoph

Am 24.02.2010 13:19, schrieb John Stowers:
> On Tue, 2010-02-23 at 08:33 +0100, Christoph David Hermann wrote:
>    
>> Hello to all,
>>
>> I'm planning to develop a simulation game using panda3D
>> (http://www.panda3d.org/) and pygtk. Unfortunately, it is not possible
>> export an OpenGL-context from panda3D and directly draw on a GTK
>> widget using an OpenGL-extension. So I decided to draw the main window
>> with pygtk, make a part of the window transparent and position the
>> panda3D window behind it. I want the GTK-window to capture all
>> keyboard and mouse inputs.
>>
>> My approach was to use shape_combine_mask
>> (http://www.pygtk.org/docs/pygtk/class-gdkwindow.html#method-gdkwindow--shape-combine-mask) to make the right part of the window transparent. This works like a charme except for one thing: The GTK window isn't only transparent at the desired area; this area seems to be nonexistent, because if I click on this area the panda3D window captures my mouse input.
>>
>> So, is there a way of making parts of a window transparent without
>> making a "hole" in the window?
>>
>> Using a compositing manager and set_opacity
>> (http://www.pygtk.org/docs/pygtk/class-gtkwindow.html#method-gtkwindow--set-opacity) is no option, because running panda3D makes the composition manager crash and return to normal mode on my target platform.
>>
>> A solution which works on windows (xp and 7) and linux (ubuntu Karmic
>> Koala) would be nice ;-)
>>      
> I suspect you might have more luck by hacking pygtkglext, or writing
> another small C extension to accept the gl-context from panda3d.
>
> John
>
>    
>> Thanks,
>> Christoph
>>
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>>      
>
>