[Qt-interest] Mouse Position on the screen

[Álvaro Morais]

A Quinta 28 Maio 2009 21:07:53 Karol Krizka você escreveu:
> Hi,
> Try to call the function QCursor::pos() using a timer event. It should
> accomplish what you want/
>
> From documentation:
> QPoint QCursor::pos ()   [static]
>
> Returns the position of the cursor (hot spot) in global screen 
coordinates.
>
> --
> Cheers,
> Karol Krizka
> http://www.krizka.net
>
> On Thu, May 28, 2009 at 9:30 PM, Álvaro Morais 
<alvarommorais at gmail.com> wrote:
> > Hi!
> >
> > I'm developing an application that takes mouse Events to seed a 
(not
> > so)pseudo random generator.
> >
> > While I can capture the mouse move on my application, the 
mouse
> > move is limited to the size of the widget.
> >
> >
> >
> > Kpgen::Kpgen() :
> >  QDialog()
> > {
> > ...
> >
> > // this enables all mouse events(and not just the clicked ones)
> >  setMouseTracking(true);
> >
> > }
> >
> > // virtual void mouseMoveEvent ( QMouseEvent * event )
> > void Kpgen::mouseMoveEvent ( QMouseEvent * event )
> > {
> >   std::cout << event->globalX() << ", " << event->globalY() <<
> > std::endl;
> >
> > }
> >
> >
> >
> > This works but as I said above only captures the mouse moves on 
the
> > widget.
> >
> > What I want is to capture all mouse moves on the desktop, and 
not
> > just the mouse moves inside the widget.
> >
> > I've tries QDesktopWidget like this:
> >
> >
> > QDesktopWidget *desktop = QApplication::desktop();
> >
> > Well. This doesn't work since I want to capture the mouse events 
with
> > "virtual void mouseMoveEvent ( QMouseEvent * event )"
> >
> > If I make a derivative class like this:
> >
> >
> > class desktopWidget : public QDesktopWidget
> > {
> >  Q_OBJECT
> >
> > public:
> >  desktopWidget() : QDesktopWidget(*QApplication::desktop()) // 
or
> > something similar like desktopWidget(QDesktopWidget& _d) :
> > QDesktopWidget(_d)
> >  {
> >        setMouseTracking(true);
> >  }
> >
> > protected:
> >  virtual void mouseMoveEvent ( QMouseEvent * event ) {
> >        std::cout << event->globalX() << ", " << event->globalY() 
<<
> > std::endl;
> >  }
> >
> >
> > };
> >
> >
> >
> >
> > This doesn't work since QDesktopWidget(const 
QDesktopWidget&;) is
> > private.
> >
> > I've also tried installEventFilter on QDesktopWidget but it didn't 
work.
> >
> > Last I've tried something like
> >
> > class kpgenApp : public QApplication
> > {
> >    Q_OBJECT
> > public:
> >    kpgenApp( int & argc, char ** argv );
> > protected:
> >    bool x11EventFilter ( XEvent * event );
> > };
> >
> > But I've realized that X11 only sends events also inside the 
window.
> >
> > Is any of this approaches the right one. If it is, what am I missing.
> >
> > Thanks in advance for the trouble.
> > _______________________________________________
> > Qt-interest mailing list
> > Qt-interest at trolltech.com
> > http://lists.trolltech.com/mailman/listinfo/qt-interest


Thanks. It worked. I don't know how I missed this.

Of course it was not working because I was centering my attention on 
capture mouse events, rather than the mouse position. 

I was thinking that QCursor::pos() didn't register values outside the 
window, but what I was missing was the event's that never occurred 
outside the window.

One more time, thanks. I was all day on this.