contains a string, encapsulating X, Y, the crossing mode, the notify type and , the state of the modifiers keys (Alt, Ctrl, Shift, etc), all of these separated by ":"
Description:
Generated when the pointer enters a window.
EventData can be evaluated like this :
Mode(the crossing mode) can be one of this values: GDK_CROSSING_NORMAL, GDK_CROSSING_GRAB or GDK_CROSSING_UNGRAB.
Detail(the kind of crossing that happened ) can be one of this values: GDK_NOTIFY_INFERIOR, GDK_NOTIFY_ANCESTOR, GDK_NOTIFY_VIRTUAL, GDK_NOTIFY_NONLINEAR or GDK_NOTIFY_NONLINEAR_VIRTUAL.
Return value:
This event can close the application by returning MSG_APPLICATION_QUIT. Any other return value will be ignored.