XExposeEvent(3X11) XLIB FUNCTIONS XExposeEvent(3X11)NAMEXExposeEvent - Expose event structure
STRUCTURES
The structure for Expose events contains:
typedef struct {
int type; /* Expose */
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;
int x, y;
int width, height;
int count; /* if nonzero, at least this many more */
} XExposeEvent;
When you receive this event, the structure members are set
as follows.
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 applica-
tion, it sends an XGraphicsExposeEvent structure 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 request. 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 useful to toolkit dispatchers.
The window member is set to the exposed (damaged) window.
The x and y members are set to the coordinates relative to
the window's origin and indicate the upper-left corner of
the rectangle. The width and height members are set to
the size (extent) of the rectangle. The count member is
set to the number of Expose events that are to follow. If
count is zero, no more Expose events follow for this win-
dow. However, if count is nonzero, at least that number
of Expose events (and possibly more) follow for this win-
dow. Simple applications that do not want to optimize
redisplay by distinguishing between subareas of its window
can just ignore all Expose events with nonzero counts and
perform full redisplays on events with zero counts.
SEE ALSOXAnyEvent(3X11), XButtonEvent(3X11), XCreateWindow-
Event(3X11), XCirculateEvent(3X11), XCircu-
lateRequestEvent(3X11), XColormapEvent(3X11), XConfig-
ureEvent(3X11), XConfigureRequestEvent(3X11),
XCrossingEvent(3X11), XDestroyWindowEvent(3X11), XEr-
rorEvent(3X11), XFocusChangeEvent(3X11),
X Version 11 Release 6.4 1
XExposeEvent(3X11) XLIB FUNCTIONS XExposeEvent(3X11)XGraphicsExposeEvent(3X11), XGravityEvent(3X11),
XKeymapEvent(3X11), XMapEvent(3X11), XMapRe-
questEvent(3X11), XPropertyEvent(3X11), XRepar-
entEvent(3X11), XResizeRequestEvent(3X11), XSelection-
ClearEvent(3X11), XSelectionEvent(3X11), XSelectionRe-
questEvent(3X11), XUnmapEvent(3X11), XVisibili-
tyEvent(3X11)
Xlib - C Language X Interface
X Version 11 Release 6.4 2
