我想在qt中的小部件上单击（向左或向右）时显示一条消息

Question

This code is for VLC Media Player. If I move the mouse in fullscreen, the message and the x,y coordinates get displayed. I want to display a message when I click (left or right) on fullscreen. How can I do this? I'm using Qt.

void FullscreenControllerWidget::mouseChanged( vout_thread_t *p_vout, int i_mousex, int i_mousey )
{
    bool b_toShow;

    /* FIXME - multiple vout (ie multiple mouse position ?) and thread safety if multiple vout ? */
    qDebug() << "mouse moved"; //ajay

    b_toShow = false;
    if ((i_mouse_last_move_x == -1 || i_mouse_last_move_y == -1) ||
        (abs( i_mouse_last_move_x - i_mousex ) > 2 ||
         abs( i_mouse_last_move_y - i_mousey ) > 2 ))
    {
        i_mouse_last_move_x = i_mousex;
        i_mouse_last_move_y = i_mousey;
        qDebug() << "mouse move changed x:" << i_mouse_last_move_x; // ajay
        qDebug() << "mouse move changed y:" << i_mouse_last_move_y; // ajay
        b_toShow = true;
    }

    if (b_toShow)
    {
        /* Show event */
        IMEvent *eShow = new IMEvent(FullscreenControlShow_Type, 0);
        QApplication::postEvent(this, eShow);

        /* Plan hide event */
        IMEvent *eHide = new IMEvent(FullscreenControlPlanHide_Type, 0);
        QApplication::postEvent(this, eHide);
    }
}

Answer 1

There is a special event for mouse clicks.

• http://developer.qt.nokia.com/doc/qt-4.8/qwidget.html#mousePressEvent
• http://developer.qt.nokia.com/doc/qt-4.8/qwidget.html#mouseReleaseEvent

Did you try implementing those? Btw. mouseChanged is vlc-specific.