Signal sigMouseRelease is emitted whenever the underlying widget receives a QMouseEvent of type QEvent::MouseMove because the mouse was moved. Such events occur only when a mouse button is pressed down, unless the widget property mouseTracking has been set to true. The first two arguments are the pixel coordinates of the mouse pointer when the button was released The third argument is a string containing the [[http://doc.trolltech.com/main-snapshot/qt.html#KeyboardModifier-enum][keyboard modifier names] separated by a vertical bar. The fourth argument is a string containing the names of all depressed buttons separated by a vertical bar.