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.\" $Xorg: XtCallCbks.man,v 1.3 2000/08/17 19:41:59 cpqbld 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.
.\"
.\" $XFree86: xc/doc/man/Xt/XtCallCbks.man,v 1.3 2001/02/09 03:47:50 tsi Exp $
.\"
.ds tk X Toolkit
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.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
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.hw XtCall-Callbacks XtHas-Callbacks XtCall-Callbacks-List wid-get
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.TH XtCallCallbacks __libmansuffix__ __xorgversion__ "XT FUNCTIONS"
.SH NAME
XtCallCallbacks, XtCallCallbackList, XtHasCallbacks \- process callbacks
.SH SYNTAX
.HP
void XtCallCallbacks(Widget \fIw\fP, String \fIcallback_name\fP, XtPointer
\fIcall_data\fP);
.HP
void XtCallCallbackList(Widget \fIw\fP, XtCallbackList \fIcallbacks\fP,
XtPointer \fIcall_data\fP);
.LP
typedef enum {XtCallbackNoList, XtCallbackHasNone, XtCallbackHasSome}
XtCallbackStatus;
.HP
XtCallbackStatus XtHasCallbacks(Widget \fIw\fP, String \fIcallback_name\fP);
.SH ARGUMENTS
.ds Cn \ to be executed or checked
.IP \fIcallback_name\fP 1i
Specifies the callback list\*(Cn.
.IP \fIcall_data\fP 1i
Specifies a callback-list specific data value to pass to each of the callback
procedure in the list.
.IP \fIcallbacks\fP 1i
Specifies the callback list to be executed.
.IP \fIw\fP 1i
Specifies the widget.
.SH DESCRIPTION
The
.ZN XtCallCallbacks
function calls each procedure that is registered in the specified widget's
callback list.
.LP
If \fIcallbacks\fP is not NULL,
.ZN XtCallCallbackList
calls each of the callback procedures in the list, passing client data
and \fIcall_data\fP. The \fIcallbacks\fP parameter must specify the
contents of a widget or object resource declared with representation
type
.ZN XtRCallback .
.LP
The
.ZN XtHasCallbacks
function first checks to see if the widget has a callback list identified
by callback_name.
If the callback list does not exist,
.ZN XtHasCallbacks
returns
.ZN XtCallbackNoList .
If the callback list exists but is empty,
it returns
.ZN XtCallbackHasNone .
If the callback list exists and has at least one callback registered,
it returns
.ZN XtCallbackHasSome .
.SH "SEE ALSO"
XtAddCallback(3Xt)
.br
\fI\*(xT\fP
.br
\fI\*(xL\fP
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