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+.\" $Xorg: XtAddEHand.man,v 1.4 2001/03/16 17:53:51 pookie Exp $
+.\"
+.\" Copyright (c) 1993, 1994 X Consortium
+.\"
+.\" Permission is hereby granted, free of charge, to any person obtaining a
+.\" copy of this software and associated documentation files (the "Software"),
+.\" to deal in the Software without restriction, including without limitation
+.\" the rights to use, copy, modify, merge, publish, distribute, sublicense,
+.\" and/or sell copies of the Software, and to permit persons to whom the
+.\" Software furnished to do so, subject to the following conditions:
+.\"
+.\" The above copyright notice and this permission notice shall be included in
+.\" all copies or substantial portions of the Software.
+.\"
+.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+.\" IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+.\" FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+.\" THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+.\" WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
+.\" OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+.\" SOFTWARE.
+.\"
+.\" Except as contained in this notice, the name of the X Consortium shall not
+.\" be used in advertising or otherwise to promote the sale, use or other
+.\" dealing in this Software without prior written authorization from the
+.\" X Consortium.
+.ds tk X Toolkit
+.ds xT X Toolkit Intrinsics \- C Language Interface
+.ds xI Intrinsics
+.ds xW X Toolkit Athena Widgets \- C Language Interface
+.ds xL Xlib \- C Language X Interface
+.ds xC Inter-Client Communication Conventions Manual
+.ds Rn 3
+.ds Vn 2.2
+.hw XtAdd-Event-Handler XtAdd-Raw-Event-Handler XtRemove-Event-Handler XtRemove-Raw-Event-Handler XtInsert-Event-Handler XtInsert-Raw-Event-Handler wid-get
+.na
+.de Ds
+.nf
+.\\$1D \\$2 \\$1
+.ft 1
+.ps \\n(PS
+.\".if \\n(VS>=40 .vs \\n(VSu
+.\".if \\n(VS<=39 .vs \\n(VSp
+..
+.de De
+.ce 0
+.if \\n(BD .DF
+.nr BD 0
+.in \\n(OIu
+.if \\n(TM .ls 2
+.sp \\n(DDu
+.fi
+..
+.de FD
+.LP
+.KS
+.TA .5i 3i
+.ta .5i 3i
+.nf
+..
+.de FN
+.fi
+.KE
+.LP
+..
+.de IN \" send an index entry to the stderr
+..
+.de C{
+.KS
+.nf
+.D
+.\"
+.\" choose appropriate monospace font
+.\" the imagen conditional, 480,
+.\" may be changed to L if LB is too
+.\" heavy for your eyes...
+.\"
+.ie "\\*(.T"480" .ft L
+.el .ie "\\*(.T"300" .ft L
+.el .ie "\\*(.T"202" .ft PO
+.el .ie "\\*(.T"aps" .ft CW
+.el .ft R
+.ps \\n(PS
+.ie \\n(VS>40 .vs \\n(VSu
+.el .vs \\n(VSp
+..
+.de C}
+.DE
+.R
+..
+.de Pn
+.ie t \\$1\fB\^\\$2\^\fR\\$3
+.el \\$1\fI\^\\$2\^\fP\\$3
+..
+.de ZN
+.ie t \fB\^\\$1\^\fR\\$2
+.el \fI\^\\$1\^\fP\\$2
+..
+.de NT
+.ne 7
+.ds NO Note
+.if \\n(.$>$1 .if !'\\$2'C' .ds NO \\$2
+.if \\n(.$ .if !'\\$1'C' .ds NO \\$1
+.ie n .sp
+.el .sp 10p
+.TB
+.ce
+\\*(NO
+.ie n .sp
+.el .sp 5p
+.if '\\$1'C' .ce 99
+.if '\\$2'C' .ce 99
+.in +5n
+.ll -5n
+.R
+..
+. \" Note End -- doug kraft 3/85
+.de NE
+.ce 0
+.in -5n
+.ll +5n
+.ie n .sp
+.el .sp 10p
+..
+.ny0
+.TH XtAddEventHandler 3Xt "Release 6.6" "X Version 11" "XT FUNCTIONS"
+.SH NAME
+XtAddEventHandler, XtAddRawEventHandler, XtRemoveEventHandler, XtRemoveRawEventHandler, XtInsertEventHandler, XtInsertRawEventHandler \- add and remove event handlers
+.SH SYNTAX
+void XtAddEventHandler(\fIw\fP, \fIevent_mask\fP, \fInonmaskable\fP, \
+\fIproc\fP, \fIclient_data\fP)
+.br
+ Widget \fIw\fP;
+.br
+ EventMask \fIevent_mask\fP;
+.br
+ Boolean \fInonmaskable\fP;
+.br
+ XtEventHandler \fIproc\fP;
+.br
+ XtPointer \fIclient_data\fP;
+.LP
+void XtAddRawEventHandler(\fIw\fP, \fIevent_mask\fP, \fInonmaskable\fP, \
+\fIproc\fP, \fIclient_data\fP)
+.br
+ Widget \fIw\fP;
+.br
+ EventMask \fIevent_mask\fP;
+.br
+ Boolean \fInonmaskable\fP;
+.br
+ XtEventHandler \fIproc\fP;
+.br
+ XtPointer \fIclient_data\fP;
+.LP
+void XtRemoveEventHandler(\fIw\fP, \fIevent_mask\fP, \fInonmaskable\fP, \
+\fIproc\fP, \fIclient_data\fP)
+.br
+ Widget \fIw\fP;
+.br
+ EventMask \fIevent_mask\fP;
+.br
+ Boolean \fInonmaskable\fP;
+.br
+ XtEventHandler \fIproc\fP;
+.br
+ XtPointer \fIclient_data\fP;
+.LP
+void XtRemoveRawEventHandler(\fIw\fP, \fIevent_mask\fP, \fInonmaskable\fP, \
+\fIproc\fP, \fIclient_data\fP)
+.br
+ Widget \fIw\fP;
+.br
+ EventMask \fIevent_mask\fP;
+.br
+ Boolean \fInonmaskable\fP;
+.br
+ XtEventHandler \fIproc\fP;
+.br
+ XtPointer \fIclient_data\fP;
+.LP
+void XtInsertEventHandler(\fIw\fP, \fIevent_mask\fP, \fInonmaskable\fP, \
+\fIproc\fP, \fIclient_data\fP, \fIposition\fP)
+.br
+ Widget \fIw\fP;
+.br
+ EventMask \fIevent_mask\fP;
+.br
+ Boolean \fInonmaskable\fP;
+.br
+ XtEventHandler \fIproc\fP;
+.br
+ XtPointer \fIclient_data\fP;
+.br
+ XtListPosition \fIposition\fP;
+.LP
+void XtInsertRawEventHandler(\fIw\fP, \fIevent_mask\fP, \fInonmaskable\fP, \
+\fIproc\fP, \fIclient_data\fP, \fIposition\fP)
+.br
+ Widget \fIw\fP;
+.br
+ EventMask \fIevent_mask\fP;
+.br
+ Boolean \fInonmaskable\fP;
+.br
+ XtEventHandler \fIproc\fP;
+.br
+ XtPointer \fIclient_data\fP;
+.br
+ XtListPosition \fIposition\fP;
+.LP
+typedef enum { XtListHead, XtListTail } XtListPosition;
+.SH ARGUMENTS
+.IP \fIclient_data\fP 1i
+Specifies additional data to be passed to the client's event handler.
+.ds Em to call or unregister this procedure
+.IP \fIevent_mask\fP 1i
+Specifies the event mask for which \*(Em.
+.ds Nm called or removed
+.IP \fInonmaskable\fP 1i
+Specifies a Boolean value that indicates whether this procedure should be
+\*(Nm on the nonmaskable events
+.Pn ( GraphicsExpose ,
+.ZN NoExpose ,
+.ZN SelectionClear ,
+.ZN SelectionRequest ,
+.ZN SelectionNotify ,
+.ZN ClientMessage ,
+and
+.ZN MappingNotify ).
+.ds Pr \ to be added or removed
+.IP \fIproc\fP 1i
+Specifies the procedure that is\*(Pr.
+.ds Wi for which this event handler is being registered
+.IP \fIw\fP 1i
+Specifies the widget \*(Wi.
+.IP \fIposition\fP 1i
+Specifies when the event handler is to be called relative to other
+previously registered handlers.
+.SH DESCRIPTION
+The
+.ZN 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,
+.ZN XtAddEventHandler
+calls
+.ZN XSelectInput ,
+if necessary.
+.LP
+The
+.ZN XtAddRawEventHandler
+function is similar to
+.ZN XtAddEventHandler
+except that it does not affect the widget's mask and never causes an
+.ZN XSelectInput
+for its events.
+Note that the widget might already have those mask bits set
+because of other nonraw event handlers registered on it.
+.LP
+The
+.ZN 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
+.ZN XSelectInput .
+.LP
+.ZN XtInsertEventHandler
+is identical to
+.ZN XtAddEventHandler
+with the additional \fIposition\fP argument. if \fIposition\fP is
+.ZN 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 \fIposition\fP is
+.ZN XtListTail ,
+the event handler is registered to be called after any previously
+registered event handlers. If the procedure is already registered with
+the same \fIclient_data\fP value, the specified mask augments the
+existing mask and the procedure is repositioned in the list.
+.LP
+.ZN XtInsertRawEventHandler
+is similar to
+.ZN XtInsertEventHandler
+except that it does not modify the widget's event mask and never causes an
+.ZN XSelectInput
+for the specified events. If the procedure is already registered with the
+same \fIclient_data\fP value, the specified mask augments the existing
+mask and the procedure is repositioned in the list.
+.SH "SEE ALSO"
+XtAppNextEvent(3Xt),
+XtBuildEventMask(3Xt)
+.br
+\fI\*(xT\fP
+.br
+\fI\*(xL\fP