[Qt-interest] setMouseTracking

["Alexander Carôt"]

Hej Jan,

that is a cool idea and it was indeed possible to set the setMouseTracking for my new QDesktopWidget class (in which I overwrote the mouse handlers respectively), however, they didn't fire even with a pressed mousebutton. I did it this way:

//// MAIN ///

#include <QApplication>
#include "desktopWidget.h"

int main(int argc, char *argv[]){ 
  QApplication yo(argc,argv);
  desktopWidget *dW = new desktopWidget();
  dW = (desktopWidget*) yo.desktop();
  return yo.exec();
}

/// DESKTOP WIDGET ///

#include <iostream>
#include <QMouseEvent>
#include <QEvent>
#include <QDesktopWidget>

using namespace std;

class desktopWidget : public QDesktopWidget{

  public:

  desktopWidget();
  bool event(QEvent *e);
  void mouseMoveEvent ( QMouseEvent * event );
  void mousePressEvent( QMouseEvent *event );
};


If you have any further idea please let me know.

Thanks, best

Alex




 

-------- Original-Nachricht --------
> Datum: Thu, 06 Jan 2011 18:45:38 +0100
> Von: Jan <janusius at gmx.net>
> An: qt-interest at qt.nokia.com
> Betreff: Re: [Qt-interest] setMouseTracking

> Just an idea:
> 
> Maybe it is possible to install an eventfilter on the QDesktopWidget
> 
> QDesktopWidget * QApplication::desktop ()
> 
> Through an eventfilter you may get mouse events. No idea if you can 
> enable mousetracking for the desktop widget (but it is a widget subclass 
> - so why not).
> 
> Jan
> 
> Am 06.01.2011 16:39, schrieb "Alexander Carôt":
> >> Does your main window derive from QMainWindow or just QWidget?  If not,
> >> what happens if you create a QMainWindow and set your current "main
> >> window" widget as the QMainWindow's centralWidget()?  I believe this
> >> should work (and is the common way of implementing a top level
> >> application window.)
> >
> > In fact my window derives from QWidget. Changing it to QMainWindow makes
> it receive mouseMoveEvents without clicking as desired - thank you !
> >
> > However, it does not work if the mouse resides outside the window. So I
> changed my class back to QWidget and followed your suggestion of creating
> an extra QMainWindow and set my widget as the central widget via
> setCentralWidget(); In that context I also overwrote the mouse event handler of the
> QMainWindow with mouse pos messages. Unfortunately this didn't solve the
> problem either: Only the central widget's handler fired only when placing the
> mouse on it and not outside the widget's boundaries.
> >
> > Did I correctly follow you suggestion or am I possibly mistaken ?
> >
> > Thanks and best
> >
> > Alex
> >
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> Qt-interest at qt.nokia.com
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