X Version 11 (1 September 1988) XtAddEventHandler(Xt)
NAME
XtAddEventHandler, XtAddRawEventHandler,
XtRemoveEventHandler XtRemoveRawEventHandler - add and
remove event handlers
SYNTAX
void XtAddEventHandler(w, event_mask, nonmaskable, proc,
client_data)
Widget w;
EventMask event_mask;
Boolean nonmaskable;
XtEventHandler proc;
caddr_t client_data;
void XtAddRawEventHandler(w, event_mask, nonmaskable, proc,
client_data)
Widget w;
EventMask event_mask;
Boolean nonmaskable;
XtEventHandler proc;
caddr_t client_data;
void XtRemoveEventHandler(w, event_mask, nonmaskable, proc,
client_data)
Widget w;
EventMask event_mask;
Boolean nonmaskable;
XtEventHandler proc;
caddr_t client_data;
void XtRemoveRawEventHandler(w, event_mask, nonmaskable,
proc, client_data)
Widget w;
EventMask event_mask;
Boolean nonmaskable;
XtEventHandler proc;
caddr_t client_data;
ARGUMENTS
client_data
Specifies additional data to be passed to the
client's event handler.
event_mask
Specifies the event mask for which to call or
unregister this procedure.
nonmaskable
Specifies a Boolean value that indicates whether
this procedure should be called or removed on the
nonmaskable events (GraphicsExpose, NoExpose,
SelectionClear, SelectionRequest, SelectionNotify,
ClientMessage, and MappingNotify).
proc Specifies the procedure that is to be added or
removed.
w Specifies the widget for which this event handler
is being registered.
DESCRIPTION
The XtAddEventHandler function registers a procedure with
the dispatch mechanism that is to be called when an event
that matches the mask occurs on the specified widget. If
the procedure is already registered with the same
client_data, the specified mask is ORed into the existing
mask. If the widget is realized, XtAddEventHandler calls
XSelectInput, if necessary.
The XtAddRawEventHandler function is similar to
XtAddEventHandler except that it does not affect the
widget's mask and never causes an XSelectInput for its
events. Note that the widget might already have those mask
bits set because of other nonraw event handlers registered
on it.
The XtAddRawEventHandler function is similar to
XtAddEventHandler except that it does not affect the
widget's mask and never causes an XSelectInput for its
events. Note that the widget might already have those mask
bits set because of other nonraw event handlers registered
on it.
The XtRemoveRawEventHandler function stops the specified
procedure from receiving the specified events. Because the
procedure is a raw event handler, this does not affect the
widget's mask and never causes a call on XSelectInput.
SEE ALSO
XtAppNextEvent(Xt), XtBuildEventMask(Xt)
X Toolkit Intrinsics - C Language Interface
Xlib - C Language X Interface
(printed 2/14/90) (1 September 1988) XtAddEventHandler(Xt)