CGAL users discussion list

[Sébastien Meunier <>]

Hi,

I've never used the CGAL Qt_widget since I don't work anymore with Qt3 
but with Qt4, but more generally when you use a Qt widget with specific 
needs you should define your own widget class, deriving from QtWidget 
(or here CGAL::Qt_widget) and then you can redefine your own 
keyPressEvent and mousePressEvent methods.

If your application is made with 2 widgets, I would say that your 
"myProgram" class should be the main one and thus you only have to 
create a new class for your second widget (if the behaviour is different).

Hope it'll help

Sebastien
HMI Designer

Mahmood Naderan a écrit :
> Hi,
> How can I create two independent QT window? Here is what I wrote:
> in the main():
>           QApplication app (argc, argv);
>   
>           myProgram *w = new myProgram (....);
>           app.setMainWidget (w);
>           w->show();
>           return (app.exec());
> In the constructor of myProgram class, I wrote:
>          // Create first window. 
>          widget = new CGAL::Qt_widget(this);
>          widget->resize (INIT_WIDTH, INIT_HEIGHT);
>          widget->set_window (x_min, x_max, y_min, y_max);
>          connect(widget, SIGNAL(redraw_on_back()), this, SLOT(redraw_win()));
>          connect(widget, SIGNAL(s_mousePressEvent(QMouseEvent*)), this, 
> SLOT(mousePressEvent (QMouseEvent*)));
>          setCentralWidget(widget);
>          redraw_win();
>          // create second window
>          mWid = new CGAL::Qt_widget(this);
>          mWid->resize (INIT_WIDTH, INIT_HEIGHT);
>          mWid->set_window (x_min, x_max, y_min, y_max);
>          connect(mWid, SIGNAL(redraw_on_back()), this, 
> SLOT(redraw_winMahmood()));
>          connect(mWid, SIGNAL(s_keyPressEvent(QKeyEvent*)),  this, 
> SLOT(keyPressEvent(QKeyEvent*)));
>          redraw_winMahmood();
> functions for second window are:
>         void keyPressEvent(QKeyEvent *e)
>         {
>             mWid->redraw();
>         }
>         void redraw_winMahmood()
>         {    // based on CGAL manual
>             typedef CGAL::Cartesian<int> Rep;
>             typedef CGAL::Point_2<Rep> Point_2;
>             typedef CGAL::Segment_2<Rep> Segment;
>             mWid->resize(600, 600);
>             mWid->set_window(0, 600, 0, 600);
>             mWid->show();
>             mWid->lock();
>             *mWid << CGAL::BackgroundColor(CGAL::ORANGE) << CGAL::RED;
>             *mWid << Segment(Point_2(100,100), Point_2(400,400));
>             mWid->unlock();
>         }
>  
> The first window functions are ok; I mean if I only have the first window, it works. The problem is when I add second window, after I press a key (because there should be a key event in order to create second window), strangly the first window closes!!!
> What is wrong with it?
>
> -------------------
> Mahmood Naderan
> http://ce.sharif.edu/~m_naderan
>
>
>
>       
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