XGraphicsExposeEvent, XNoExposeEvent - GraphicsExpose and NoExpose event
structures
The structures for
GraphicsExpose and
NoExpose events contain:
typedef struct {
int type; /* GraphicsExpose */
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 */
Drawable drawable;
int x, y;
int width, height;
int count; /* if nonzero, at least this many more */
int major_code; /* core is CopyArea or CopyPlane */
int minor_code; /* not defined in the core */
} XGraphicsExposeEvent;
typedef struct {
int type; /* NoExpose */
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 */
Drawable drawable;
int major_code; /* core is CopyArea or CopyPlane */
int minor_code; /* not defined in the core */
} XNoExposeEvent;
When you receive these events, their 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 application, 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.
Both structures have these common members: drawable, major_code, and minor_code.
The drawable member is set to the drawable of the destination region on which
the graphics request was to be performed. The major_code member is set to the
graphics request initiated by the client and can be either
X_CopyArea
or
X_CopyPlane. If it is
X_CopyArea, a call to
XCopyArea
initiated the request. If it is
X_CopyPlane, a call to
XCopyPlane initiated the request. These constants are defined in
X11/Xproto.h. The minor_code member, like the major_code member,
indicates which graphics request was initiated by the client. However, the
minor_code member is not defined by the core X protocol and will be zero in
these cases, although it may be used by an extension.
The
XGraphicsExposeEvent structure has these additional members: x, y,
width, height, and count. The x and y members are set to the coordinates
relative to the drawable'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
GraphicsExpose
events to follow. If count is zero, no more
GraphicsExpose events
follow for this window. However, if count is nonzero, at least that number of
GraphicsExpose events (and possibly more) are to follow for this
window.
XAnyEvent(3),
XButtonEvent(3),
XCreateWindowEvent(3),
XCirculateEvent(3),
XCirculateRequestEvent(3),
XColormapEvent(3),
XConfigureEvent(3),
XConfigureRequestEvent(3),
XCopyArea(3),
XCrossingEvent(3),
XDestroyWindowEvent(3),
XErrorEvent(3),
XExposeEvent(3),
XFocusChangeEvent(3),
XGravityEvent(3),
XKeymapEvent(3),
XMapEvent(3),
XMapRequestEvent(3),
XPropertyEvent(3),
XReparentEvent(3),
XResizeRequestEvent(3),
XSelectionClearEvent(3),
XSelectionEvent(3),
XSelectionRequestEvent(3),
XUnmapEvent(3),
XVisibilityEvent(3)
Xlib - C Language X Interface