[Qt-interest] Mouse Position on the screen

[Álvaro Morais]

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.