QApplication does not handle key event?
===

    QApplication app(argc, 0);
    MyDialog * pDlg = new MyDialog(0, Qt::WindowTitleHint | Qt::CustomizeWindowHint);
    if (qApp) qApp->installEventFilter(pDlg);

In main(), I just install a event filter for qApp. Then in MyDialog.cpp:

    bool MyDialog::eventFilter(QObject * watched, QEvent * event)
    {
    	if (watched == qApp)
    	{
    		if (event->type() == QEvent::KeyPress)
    		{
    			// do something
    			return true;
    		}
    		return false;
    	}
    	return QDialog::eventFilter(watched, event);
    }

I set some breakpoints. the line "return false" can be reached, it means the qApp had successfully installed a event filter at MyDialog. But line 'return true' never reached when I press keyboard. I remember that QApplication will dispatch all event. Could anybody tell me why this happened?


