XAnyEvent(3) XLIB FUNCTIONS XAnyEvent(3)
NAME
XAnyEvent, XEvent - generic X event structures
STRUCTURES
All the event structures declared in <X11/Xlib.h> have the following
common members:
typedef struct {
int type;
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 window;
} XAnyEvent;
The type member is set to the event type constant name that uniquely
identifies it. For example, when the X server reports a GraphicsExpose
event to a client application, it sends an XGraphicsExposeEvent struc-
ture with the type member set to GraphicsExpose. The display member is
set to a pointer to the display the event was read on. The send_event
member is set to True if the event came from a SendEvent protocol re-
quest. The serial member is set from the serial number reported in the
protocol but expanded from the 16-bit least-significant bits to a full
32-bit value. The window member is set to the window that is most use-
ful to toolkit dispatchers.
The XEvent structure is a union of the individual structures declared
for each event type:
typedef union _XEvent {
int type; /* must not be changed */
XAnyEvent xany;
XKeyEvent xkey;
XButtonEvent xbutton;
XMotionEvent xmotion;
XCrossingEvent xcrossing;
XFocusChangeEvent xfocus;
XExposeEvent xexpose;
XGraphicsExposeEvent xgraphicsexpose;
XNoExposeEvent xnoexpose;
XVisibilityEvent xvisibility;
XCreateWindowEvent xcreatewindow;
XDestroyWindowEvent xdestroywindow;
XUnmapEvent xunmap;
XMapEvent xmap;
XMapRequestEvent xmaprequest;
XReparentEvent xreparent;
XConfigureEvent xconfigure;
XGravityEvent xgravity;
XResizeRequestEvent xresizerequest;
XConfigureRequestEvent xconfigurerequest;
XCirculateEvent xcirculate;
XCirculateRequestEvent xcirculaterequest;
XPropertyEvent xproperty;
XSelectionClearEvent xselectionclear;
XSelectionRequestEvent xselectionrequest;
XSelectionEvent xselection;
XColormapEvent xcolormap;
XClientMessageEvent xclient;
XMappingEvent xmapping;
XErrorEvent xerror;
XKeymapEvent xkeymap;
long pad[24];
} XEvent;
An XEvent structure's first entry always is the type member, which is
set to the event type. The second member always is the serial number of
the protocol request that generated the event. The third member always
is send_event, which is a Bool that indicates if the event was sent by a
different client. The fourth member always is a display, which is the
display that the event was read from. Except for keymap events, the
fifth member always is a window, which has been carefully selected to be
useful to toolkit dispatchers. To avoid breaking toolkits, the order of
these first five entries is not to change. Most events also contain a
time member, which is the time at which an event occurred. In addition,
a pointer to the generic event must be cast before it is used to access
any other information in the structure.
SEE ALSO
XButtonEvent(3), XCreateWindowEvent(3), XCirculateEvent(3), XCircu-
lateRequestEvent(3), XColormapEvent(3), XConfigureEvent(3), XConfigur-
eRequestEvent(3), XCrossingEvent(3), XDestroyWindowEvent(3), XEr-
rorEvent(3), XExposeEvent(3), XFocusChangeEvent(3), XGraphicsEx-
poseEvent(3), XGravityEvent(3), XKeymapEvent(3), XMapEvent(3), XMapRe-
questEvent(3), XPropertyEvent(3), XReparentEvent(3), XResiz-
eRequestEvent(3), XSelectionClearEvent(3), XSelectionEvent(3), XSelec-
tionRequestEvent(3), XUnmapEvent(3), XVisibilityEvent(3)
Xlib - C Language X Interface
X Version 11 libX11 1.8.12 XAnyEvent(3)
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