Determining which screen a full screen window is on

On a multi-head system, is there any easy way to determine which screen a
random full-screen window resides on?

QDesktopWidget is the only Qt/KDE class I can find which gives
multi-screen information, but it only returns the screen number for a
QWidget or a QPoint. I need to be able to find this information for ANY
full-screen window - not just Qt ones - so the QWidget variant is no use.
And KWindowInfo::geometry() and KWindowInfo::frameGeometry() both return a
null QRect for a full screen window, so the QPoint variant doesn't work
either.

Are there any other library functions to give this information? I could
cobble something together based on how QDesktopWidget works, but it's not
ideal for maintainability, and could be fraught from the cross-platform
perspective also.

--
David Jarvie.
KDE developer.
KAlarm author & maintainer.
http://www.astrojar.org.uk/kalarm

 
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On Tuesday 03 November 2009 09:39:05 David Jarvie wrote:

> On a multi-head system, is there any easy way to determine which screen a
> random full-screen window resides on?
>
> QDesktopWidget is the only Qt/KDE class I can find which gives
> multi-screen information, but it only returns the screen number for a
> QWidget or a QPoint. I need to be able to find this information for ANY
> full-screen window - not just Qt ones - so the QWidget variant is no use.
> And KWindowInfo::geometry() and KWindowInfo::frameGeometry() both return a
> null QRect for a full screen window, so the QPoint variant doesn't work
> either.
>
> Are there any other library functions to give this information? I could
> cobble something together based on how QDesktopWidget works, but it's not
> ideal for maintainability, and could be fraught from the cross-platform
> perspective also.

The NET series in kdelibs might be what you want.  (Like NET::WinInfo, etc.)

The API docs are hard to find though, you may have to Google it. :-/

Regards,
 - Michael Pyne


 
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[Lubos Lunak]

On Tuesday 03 of November 2009, David Jarvie wrote:

> On a multi-head system, is there any easy way to determine which screen a
> random full-screen window resides on?
>
> QDesktopWidget is the only Qt/KDE class I can find which gives
> multi-screen information, but it only returns the screen number for a
> QWidget or a QPoint. I need to be able to find this information for ANY
> full-screen window - not just Qt ones - so the QWidget variant is no use.
> And KWindowInfo::geometry() and KWindowInfo::frameGeometry() both return a
> null QRect for a full screen window, so the QPoint variant doesn't work
> either.

 Then those KWindowInfo functions have a bug, which I consider a bit unlikely,
or you are doing something wrong. Presumably you just need to watch the
kWarning() on stderr and do what it says?

--
Lubos Lunak
KDE developer
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