XLIB Programming Manual, Rel. 5, Third Edition

Name

GravityNotify — xgravity

When Generated

A GravityNotify event reports when a window is moved because of a change in the size of its parent. This happens when the win_gravity attribute of the child window is something other than StaticGravity or UnmapGravity.

Select With

This event is selected for a single window by specifying the window ID of that window with StructureNotifyMask. To receive notification of movement due to gravity for a group of siblings, specify the parent window ID with SubstructureNotifyMask.

XEvent Structure Name

typedef union _XEvent {
    ...
    XGravityEvent xgravity;
    ...
} XEvent;

Event Structure

typedef struct {
    int type;
    unsigned long serial;    /* # of last request processed by server */
    Bool send_event;         /* True if this came from SendEvent request */
    Display *display;        /* Display the event was read from */
    Window event;
    Window window;
    int x, y;
} XGravityEvent;

Event Structure Members

event

The window that selected the event.

window

The window that was moved.

x, y

The new coordinates of the window relative to its parent.