MirOS Manual: XtCheckSubclass(3), XtClass(3), XtIsApplicationShell(3), XtIsComposite(3), XtIsConstraint(3), XtIsObject(3), XtIsOverrideShell(3), XtIsRectObj(3), XtIsSessionShell(3), XtIsShell(3), XtIsSubclass(3), XtIsTopLevelShell(3), XtIsTransientShell(3), XtIsVendorShell(3), XtIsWidget(3), XtIsWMShell(3), XtSuperclass(3)


XtClass(3Xt)              XT FUNCTIONS               XtClass(3Xt)

NAME

     XtClass, XtSuperclass, XtIsSubclass, XtCheckSubclass, XtIs-
     Object, XtIsRectObj, XtIsWidget, XtIsComposite, XtIs-
     Constraint, XtIsShell, XtIsOverrideShell, XtIsWMShell, XtIs-
     VendorShell, XtIsTransientShell, XtIsTopLevelShell, XtIs-
     ApplicationShell, XtIsSessionShell - obtain and verify a
     widget's class

SYNTAX

     WidgetClass XtClass(Widget w);

     WidgetClass XtSuperclass(Widget w);

     Boolean XtIsSubclass(Widget w, WidgetClass widget_class);

     void XtCheckSubclass(Widget widget, WidgetClass
          widget_class, String message);

     Boolean XtIsObject(Widget w);

     Boolean XtIsRectObj(Widget w);

     Boolean XtIsWidget(Widget w);

     Boolean XtIsComposite(Widget w);

     Boolean XtIsConstraint(Widget w,

     Boolean XtIsShell(Widget w);

     Boolean XtIsOverrideShell(Widget w);

     Boolean XtIsWMShell(Widget w);

     Boolean XtIsVendorShell(Widget w);

     Boolean XtIsTransientShell(Widget w);

     Boolean XtIsTopLevelShell(Widget w);

     Boolean XtIsApplicationShell(Widget w);

     Boolean XtIsSessionShell(Widget w);

ARGUMENTS

     w         Specifies the widget.

     widget_class
               Specifies the widget class.

     message   Specifies the message that is to be used.

XFree86                   Version 4.5.0                         1

XtClass(3Xt)              XT FUNCTIONS               XtClass(3Xt)

DESCRIPTION

     The XtClass function returns a pointer to the widget's class
     structure.

     The XtSuperclass function returns a pointer to the widget's
     superclass class structure.

     The XtIsSubclass function returns True if the class of the
     specified widget is equal to or is a subclass of the speci-
     fied class. The widget's class can be any number of subc-
     lasses down the chain and need not be an immediate subclass
     of the specified class. Composite widgets that need to res-
     trict the class of the items they contain can use XtIsSub-
     class to find out if a widget belongs to the desired class
     of objects.

     The XtCheckSubclass macro determines if the class of the
     specified widget is equal to or is a subclass of the speci-
     fied widget class. The widget can be any number of subc-
     lasses down the chain and need not be an immediate subclass
     of the specified widget class. If the specified widget is
     not a subclass, XtCheckSubclass constructs an error message
     from the supplied message, the widget's actual class, and
     the expected class and calls XtErrorMsg. 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.

     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.

     To test if a given widget belongs to a subclass of an
     Intrinsics-defined class, the Intrinsics defines macros or
     functions equivalent to XtIsSubclass for each of the built-
     in classes. These procedures are XtIsObject, XtIsRectObj,
     XtIsWidget, XtIsComposite, XtIsConstraint, XtIsShell, XtIs-
     OverrideShell, XtIsWMShell, XtIsVendorShell, XtIsTransient-
     Shell, XtIsTopLevelShell, XtIsApplicationShell, and ZN
     XtIsSessionShell .

     The

SEE ALSO

     XtAppErrorMsg(3Xt), XtDisplay(3Xt)
     X Toolkit Intrinsics - C Language Interface
     Xlib - C Language X Interface

XFree86                   Version 4.5.0                         2

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