[pygtk] Making part of a GTK-window transparent and position another window behind
john.stowers.lists at gmail.com
Wed Feb 24 21:00:58 WST 2010
On Wed, 2010-02-24 at 13:36 +0100, Christoph David Hermann wrote:
> Hi John,
> thanks for your answer.
> I found an article on
> 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.
A lot of features that rely on window manager functionality are not
guaranteed to work on windows, which is why I suspect that you will
never achieve the result you wish using this approach.
> 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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