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,

XWIN 3.0               Last change: 9/1/88                 .ie t

               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 XtAd-
dEventHandler 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 XtAd-
dEventHandler 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(3Xt), XtBuildEventMask(3Xt)
     X Toolkit Intrinsics - C Language Interface
     Xlib - C Language X Interface

XWIN 3.0               Last change: 9/1/88                 .ie t

XWIN 3.0               Last change: 9/1/88                 .ie t