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XtAddEventHandler, XtAddRawEventHandler, XtRemoveEventHandler, XtRemoveRawEventHandler, XtInsertEventHandler, XtInsertRawEventHandler - add and remove event handlers
void
XtAddEventHandler(w, event_mask, nonmaskable, proc, client_data)
Widget w;
EventMask event_mask;
Boolean nonmaskable;
XtEventHandler proc;
XtPointer client_data;
void
XtAddRawEventHandler(w, event_mask, nonmaskable, proc, client_data)
Widget w;
EventMask event_mask;
Boolean nonmaskable;
XtEventHandler proc;
XtPointer client_data;
void
XtRemoveEventHandler(w, event_mask, nonmaskable, proc, client_data)
Widget w;
EventMask event_mask;
Boolean nonmaskable;
XtEventHandler proc;
XtPointer client_data;
void
XtRemoveRawEventHandler(w, event_mask, nonmaskable, proc, client_data)
Widget w;
EventMask event_mask;
Boolean nonmaskable;
XtEventHandler proc;
XtPointer client_data;
void
XtInsertEventHandler(w, event_mask, nonmaskable, proc, client_data, position)
Widget w;
EventMask event_mask;
Boolean nonmaskable;
XtEventHandler proc;
XtPointer client_data;
XtListPosition position;
void
XtInsertRawEventHandler(w, event_mask, nonmaskable, proc, client_data, position)
Widget w;
EventMask event_mask;
Boolean nonmaskable;
XtEventHandler proc;
XtPointer client_data;
XtListPosition position;
typedef
enum { XtListHead, XtListTail } XtListPosition;
Specifies additional data to be passed to the client's event
handler.
Specifies the event mask for which to call or unregister this
procedure.
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).
Specifies the procedure that is to be added or removed.
Specifies the widget for which this event handler is being
registered.
Specifies when the event handler is to be called relative
to other previously registered handlers.
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 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.
XtInsertEventHandler is identical to XtAddEventHandler with the additional position argument. If position is XtListHead, 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 XtListTail, 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.
XtInsertRawEventHandler
is similar to
XtInsertEventHandler
except that it does not modify the widget's event mask and never
causes an
XSelectInput
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.
XtAppNextEvent(3Xt), XtBuildEventMask(3Xt)
X Toolkit Intrinsics -- C Language Interface
Xlib -- C Language X Interface