To receive
GravityNotify
events, set the
StructureNotifyMask
bit in the event-mask attribute of the window or the
SubstructureNotifyMask
bit in the event-mask attribute of the parent window
(in which case, any child that is moved because its parent has been resized
generates an event).
The structure for this event type contains:
typedef struct {
int type; /* GravityNotify */
unsigned long serial; /* # of last request processed by server */
Bool send_event; /* true if this came from a SendEvent request */
Display *display; /* Display the event was read from */
Window event;
Window window;
int x, y;
} XGravityEvent;
The event member is set either to the window that was moved or to its parent,
depending on whether
StructureNotify
or
SubstructureNotify
was selected.
The window member is set to the child window that was moved.
The x and y members are set to the coordinates relative to the
new parent window's origin
and indicate the position of the upper-left outside corner of the
window.