The PySide.QtGui.QIconDragEvent class indicates that a main icon drag has begun.
Icon drag events are sent to widgets when the main icon of a window has been dragged away. On Mac OS X, this happens when the proxy icon of a window is dragged off the title bar.
It is normal to begin using drag and drop in response to this event.
Constructs an icon drag event object with the accept flag set to false.