XtAddEventHandler
NAME
XtAddEventHandler, XtAddRawEventHandler, XtRemoveEventHandler, XtRemoveRawEventHandler, XtInsertEventHandler, XtInsertRawEventHandler - add and remove event handlers
SYNTAX
void XtAddEventHandler(Widget w, EventMask event_mask, Boolean
nonmaskable, XtEventHandler proc, XtPointer client_data);
void XtAddRawEventHandler(Widget w, EventMask event_mask, Boolean
nonmaskable, XtEventHandler proc, XtPointer client_data);
void XtRemoveEventHandler(Widget w, EventMask event_mask, Boolean
nonmaskable, XtEventHandler proc, XtPointer client_data);
void XtRemoveRawEventHandler(Widget w, EventMask event_mask,
Boolean nonmaskable, XtEventHandler proc, XtPointer
client_data);
void XtInsertEventHandler(Widget w, EventMask event_mask, Boolean
nonmaskable, XtEventHandler proc, XtPointer client_data,
XtListPosition position);
void XtInsertRawEventHandler(Widget w, EventMask event_mask,
Boolean nonmaskable, XtEventHandler proc, XtPointer
client_data, XtListPosition position);
typedef enum { XtListHead, XtListTail } XtListPosition;
ARGUMENTS
client_data
Specifies additional data to be passed to the client's event handler.
event_mask
Specifies the event mask for which .
nonmaskable
Specifies a Boolean value that indicates whether this procedure should be
on the nonmaskable events
and
proc
Specifies the procedure that is.
w
Specifies the widget .
position
Specifies when the event handler is to be called relative to other
previously registered handlers.
DESCRIPTION
The
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,
calls
if necessary.
The
function is similar to
except that it does not affect the widget's mask and never causes an
for its events.
Note that the widget might already have those mask bits set
because of other nonraw event handlers registered on it.
The
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
is identical to
with the additional position argument. if position is
the event handler is registered to that it will be called before
any event handlers that were previously registered for the same widget.
If position is
the event handler is registered to be called after any previously
registered event handlers. If the procedure is already registered with
the same client_data value, the specified mask augments the
existing mask and the procedure is repositioned in the list.
is similar to
except that it does not modify the widget's event mask and never causes an
for the specified events. If the procedure is already registered with the
same client_data value, the specified mask augments the existing
mask and the procedure is repositioned in the list.
SEE ALSO
XtAppNextEvent(3Xt),
XtBuildEventMask(3Xt)
