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.\" Copyright 1993 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 is 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 dealings 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 XtCheck-Subclass XtIs-Object XtIs-RectObj XtIs-Widget XtIs-Composite
.hw XtIs-Constraint XtIs-Shell XtIs-Override-Shell XtIs-WM-Shell
.hw XtIs-Vendor-Shell XtIs-Transient-Shell XtIs-Top-Level-Shell
.hw XtIs-Application-Shell wid-get
.na
.TH XtClass __libmansuffix__ __xorgversion__ "XT FUNCTIONS"
.SH NAME
XtClass, XtSuperclass, XtIsSubclass, XtCheckSubclass, XtIsObject, XtIsRectObj, XtIsWidget, XtIsComposite, XtIsConstraint, XtIsShell, XtIsOverrideShell, XtIsWMShell, XtIsVendorShell, XtIsTransientShell, XtIsTopLevelShell, XtIsApplicationShell, XtIsSessionShell \- obtain and verify a widget's class
.SH SYNTAX
#include <X11/Intrinsic.h>
.HP
WidgetClass XtClass(Widget \fIw\fP);
.HP
WidgetClass XtSuperclass(Widget \fIw\fP);
.HP
Boolean XtIsSubclass(Widget \fIw\fP, WidgetClass \fIwidget_class\fP);
.HP
void XtCheckSubclass(Widget \fIwidget\fP, WidgetClass \fIwidget_class\fP,
String \fImessage\fP);
.HP
Boolean XtIsObject(Widget \fIw\fP);
.HP
Boolean XtIsRectObj(Widget \fIw\fP);
.HP
Boolean XtIsWidget(Widget \fIw\fP);
.HP
Boolean XtIsComposite(Widget \fIw\fP);
.HP
Boolean XtIsConstraint(Widget \fIw\fP);
.HP
Boolean XtIsShell(Widget \fIw\fP);
.HP
Boolean XtIsOverrideShell(Widget \fIw\fP);
.HP
Boolean XtIsWMShell(Widget \fIw\fP);
.HP
Boolean XtIsVendorShell(Widget \fIw\fP);
.HP
Boolean XtIsTransientShell(Widget \fIw\fP);
.HP
Boolean XtIsTopLevelShell(Widget \fIw\fP);
.HP
Boolean XtIsApplicationShell(Widget \fIw\fP);
.HP
Boolean XtIsSessionShell(Widget \fIw\fP);
.SH ARGUMENTS
.IP \fIw\fP 1i
Specifies the widget.
.IP \fIwidget_class\fP 1i
Specifies the widget class.
.IP \fImessage\fP 1i
Specifies the message that is to be used.
.SH DESCRIPTION
The
.B XtClass
function returns a pointer to the widget's class structure.
.LP
The
.B XtSuperclass
function returns a pointer to the widget's superclass class structure.
.LP
The
.B XtIsSubclass
function returns
.B True
if the class of the specified widget is equal to or is a subclass of
the specified class.
The widget's class can be any number of subclasses
down the chain and need not be an immediate subclass of the specified
class.
Composite widgets that need to restrict the class of the items
they contain can use
.B XtIsSubclass
to find out if a widget belongs to the desired class of objects.
.LP
The
.B XtCheckSubclass
macro determines if the class of the specified widget is equal to
or is a subclass of the specified widget class.
The widget can be any number of subclasses down the chain
and need not be an immediate subclass of the specified widget class.
If the specified widget is not a subclass,
.B XtCheckSubclass
constructs an error message from the supplied message,
the widget's actual class, and the expected class and calls
.BR XtErrorMsg .
.B XtCheckSubclass
should be used at the entry point of exported routines to ensure
that the client has passed in a valid widget class for the exported operation.
.LP
.B XtCheckSubclass
is only executed when the widget has been compiled with the compiler symbol
DEBUG defined; otherwise, it is defined as the empty string
and generates no code.
.LP
To test if a given widget belongs to a subclass of an Intrinsics-defined
class, the Intrinsics defines macros or functions equivalent to
.B XtIsSubclass
for each of the built-in classes.
These procedures are
.BR XtIsObject ,
.BR XtIsRectObj ,
.BR XtIsWidget ,
.BR XtIsComposite ,
.BR XtIsConstraint ,
.BR XtIsShell ,
.BR XtIsOverrideShell ,
.BR XtIsWMShell ,
.BR XtIsVendorShell ,
.BR XtIsTransientShell ,
.BR XtIsTopLevelShell ,
.BR XtIsApplicationShell ,
and
.BR XtIsSessionShell .
.LP
The
.SH "SEE ALSO"
XtAppErrorMsg(__libmansuffix__),
XtDisplay(__libmansuffix__)
.br
\fI\*(xT\fP
.br
\fI\*(xL\fP
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