The QMouseEvent class contains parameters that describe a mouse event. ... QMouseEvent  ( int type, const QPoint & pos, int button, int state )  . ... Mouse events occur when a mouse button is pressed or released inside a widget, or when the mouse cursor is moved. Mouse move events will only occur when some mouse button is pressed down, unless mouse tracking has been enabled. ... The QWidget::setEnable() function can be used to enable or disable mouse and keyboard events for a widget. ...