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XNextEvent(3) XLIB FUNCTIONS XNextEvent(3)
NAME
XNextEvent, XPeekEvent, XWindowEvent, XCheckWindowEvent, XMaskEvent, XCheckMaskEvent,
XCheckTypedEvent, XCheckTypedWindowEvent - select events by type
SYNTAX
int XNextEvent(Display *display, XEvent *event_return);
int XPeekEvent(Display *display, XEvent *event_return);
int XWindowEvent(Display *display, Window w, long event_mask, XEvent *event_return);
Bool XCheckWindowEvent(Display *display, Window w, long event_mask, XEvent *event_return);
int XMaskEvent(Display *display, long event_mask, XEvent *event_return);
Bool XCheckMaskEvent(Display *display, long event_mask, XEvent *event_return);
Bool XCheckTypedEvent(Display *display, int event_type, XEvent *event_return);
Bool XCheckTypedWindowEvent(Display *display, Window w, int event_type, XEvent
*event_return);
ARGUMENTS
display Specifies the connection to the X server.
event_mask
Specifies the event mask.
event_return
Returns the matched event's associated structure.
event_return
Returns the next event in the queue.
event_return
Returns a copy of the matched event's associated structure.
event_type
Specifies the event type to be compared.
w Specifies the window whose event uou are interested in.
DESCRIPTION
The XNextEvent function copies the first event from the event queue into the specified
XEvent structure and then removes it from the queue. If the event queue is empty, XNex-
tEvent flushes the output buffer and blocks until an event is received.
The XPeekEvent function returns the first event from the event queue, but it does not
remove the event from the queue. If the queue is empty, XPeekEvent flushes the output
buffer and blocks until an event is received. It then copies the event into the client-
supplied XEvent structure without removing it from the event queue.
The XWindowEvent function searches the event queue for an event that matches both the
specified window and event mask. When it finds a match, XWindowEvent removes that event
from the queue and copies it into the specified XEvent structure. The other events stored
in the queue are not discarded. If a matching event is not in the queue, XWindowEvent
flushes the output buffer and blocks until one is received.
The XCheckWindowEvent function searches the event queue and then the events available on
the server connection for the first event that matches the specified window and event
mask. If it finds a match, XCheckWindowEvent removes that event, copies it into the spec-
ified XEvent structure, and returns True. The other events stored in the queue are not
discarded. If the event you requested is not available, XCheckWindowEvent returns False,
and the output buffer will have been flushed.
The XMaskEvent function searches the event queue for the events associated with the speci-
fied mask. When it finds a match, XMaskEvent removes that event and copies it into the
specified XEvent structure. The other events stored in the queue are not discarded. If
the event you requested is not in the queue, XMaskEvent flushes the output buffer and
blocks until one is received.
The XCheckMaskEvent function searches the event queue and then any events available on the
server connection for the first event that matches the specified mask. If it finds a
match, XCheckMaskEvent removes that event, copies it into the specified XEvent structure,
and returns True. The other events stored in the queue are not discarded. If the event
you requested is not available, XCheckMaskEvent returns False, and the output buffer will
have been flushed.
The XCheckTypedEvent function searches the event queue and then any events available on
the server connection for the first event that matches the specified type. If it finds a
match, XCheckTypedEvent removes that event, copies it into the specified XEvent structure,
and returns True. The other events in the queue are not discarded. If the event is not
available, XCheckTypedEvent returns False, and the output buffer will have been flushed.
The XCheckTypedWindowEvent function searches the event queue and then any events available
on the server connection for the first event that matches the specified type and window.
If it finds a match, XCheckTypedWindowEvent removes the event from the queue, copies it
into the specified XEvent structure, and returns True. The other events in the queue are
not discarded. If the event is not available, XCheckTypedWindowEvent returns False, and
the output buffer will have been flushed.
SEE ALSO
XAnyEvent(3X11), XIfEvent(3X11), XPutBackEvent(3X11), XSendEvent(3X11)
Xlib - C Language X Interface
X Version 11 libX11 1.2.1 XNextEvent(3) |
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