.\" $Xorg: XtCallCbks.man,v 1.3 2000/08/17 19:41:59 cpqbld Exp $
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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 3Xt __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