[Qt-interest] fullscreen windows on X11 +Xinerama

[Clinton Stimpson]

Are you using OpenGL with this top level window?  If so, you may need to be 
smarter about XCreateWindow() by getting the right visual and other 
parameters.

  Window win = XCreateWindow(display, p, a.x, a.y, a.width, a.height,
                             0, vi->depth, InputOutput, vi->visual,
                             CWBackPixel|CWBorderPixel|CWColormap, &attrib);

Complete code is accessible here:
<http://public.kitware.com/cgi-
bin/viewcvs.cgi/GUISupport/Qt/QVTKWidget.cxx?view=markup>

Otherwise, you could probably just use your top level window as a container 
for other widgets.
Also, the OpenGL context should be created during the first show().

Clint

On Wednesday 10 March 2010 01:10:15 pm Wesley Smith wrote:
> thanks!  I'm able to use the create(...) function to do what I want,
> but now I'm having trouble with OpenGL contexts.  Does anyone know how
> passing a window generated with XCreateWindow interacts with the
> QGLWidget's OpenGL context?  Do I also have to make my own context?
> It's giving me XBadDrawable errors right now.  From what I understand,
> create gets called by in the constructor.  Does anyone know where the
> opengl context gets created?  Does calling create invalidate it if it
> exists such that the widget will recreate it properly?  Or do I have
> to manage this myself?
> 
> thanks,
> wes
> 
> On Wed, Mar 10, 2010 at 11:27 AM, Clinton Stimpson <clinton at elemtech.com> 
wrote:
> > On Wednesday 10 March 2010 11:51:51 am Wesley Smith wrote:
> >> I'm having some issues trying to get fullscreen windows to span
> >> multiple heads on X11 with Xinerama.  I'm on ubuntu Jaunty with Qt
> >> 4.3.  From what I can tell, the window manager is restricting windows
> >> to be the size of one monitor.  I've also tried setting the window to
> >> be borderless with a size equivalent to the multi-head display and i'm
> >> not able to get the window beyond one monitor without dragging it
> >> manually.
> >>
> >> I've managed to get a proper multihead fullscreen window in X11
> >> directly using XSetWindowAttrbutes.override_redirect = True and adding
> >> the CWOverrideRedirect flag to the window mask field of XCreateWindow.
> >>  Now I'm looking for a way to do this through Qt.  Is there any way
> >> for meet to somehow add these flags while still using QWidget's show
> >> method to turn a widget into a window?
> >
> > If not, then you can still do an XCreateWindow and then use that when you
> > call QWidget::create(...).
> >
> > Clint
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