X11: Opening QWidget in a separate XScreen

ElSampsa

Hi,

If a Qt application is opened in xscreen ":0.0", is it possible for that application instance to open a QWidget in a different xscreen (in, say, ":0.1")

At the X windowing API, this would map to to calling Xlib's XOpenDisplay() function with a certain display name when creating the QWidget.

Does Qt have this possibility?

Regards,

Sampsa

SGaist

Hi and welcome to devnet,

Do you mean move the widget to one of the desktop returned by QDesktopWidget ?

ElSampsa

Hi,

I have used QDesktopWidget before to move windows between different screens (inside the same xscreen).

Now that I read the class description again, it does say that QDesktopWidget should work for "multiple desktops" as well.. But "multiple desktops" may refer to either multiple desktops on a single "macro" xscreen (i.e. at :0.0) or to desktops on different xscreens (i.e. :0.0 and :0.1)

Here are some relevant posts that I found:

http://www.qtcentre.org/threads/64782-Mapping-QScreen-to-X11-display-number
https://bugreports.qt.io/browse/QTBUG-45485
https://bugreports.qt.io/browse/QTBUG-48545

I guess there is only one way to find out: trying QDesktopWidget with multiple xscreen configured and see if it works.

.. however, I wanted to know a-priori, if this is possible in Qt, before starting to tweak with "xorg.conf". Trying to configure multiple xscreens for the nouveau graphics driver is such a pain these days..

Regards,

Sampsa

Konstantin Tokarev

@ElSampsa said in X11: Opening QWidget in a separate XScreen:

Trying to configure multiple xscreens for the nouveau graphics driver is such a pain these days..

But you can use graphics driver instead of nouveau... :)