Qt-interest Archive, August 2006
Draw directly on the screen
Message 1 in thread
Hi,
Is it possible to draw directly on the screen, ie. without a widget
frame and background ? I tried this :
QDesktopWidget* d = new QDesktopWidget();
QWidget* w = d->screen();
QPainter p(w);
// painting ...
p.end();
But nothing appears even if the application doesn't terminate.
I am working on Windows XP.
Thanks
Kwakanar
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Message 2 in thread
Hi,
I don't think you're supposed to draw directly to QDesktopWidget. It's only there to provide information about the desktop. I think you'll need to fake it
by making your top level widget frameless (Qt::FramelessHint, I think) and grabbing the background with:
QPixmap::grabWindow(QApplication::desktop()->winId()); // stolen from screenshot example.
Supposedly, kde4 will have true desktop transparency but I doubt it'll apply to winXP. (maybe vista though)
Cheers,
Ben
> -----Original Message-----
> From: Raphaël Kolm [mailto:kwakanar@xxxxxxxxx]
> Sent: Sunday, August 20, 2006 9:02 PM
> To: qt-interest@xxxxxxxxxxxxx
> Subject: Draw directly on the screen
>
> Hi,
>
> Is it possible to draw directly on the screen, ie. without a
> widget frame and background ? I tried this :
>
> QDesktopWidget* d = new QDesktopWidget();
> QWidget* w = d->screen();
> QPainter p(w);
> // painting ...
> p.end();
>
> But nothing appears even if the application doesn't terminate.
>
> I am working on Windows XP.
>
> Thanks
> Kwakanar
>
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