XtRealizeWidget(3Xt)

NAME
       XtRealizeWidget, XtIsRealized, XtUnrealizeWidget - realize
       and unrealize widgets

SYNTAX
       void XtRealizeWidget(w)
             Widget w;

       Boolean XtIsRealized(w)
             Widget w;

       void XtUnrealizeWidget(w)
             Widget w;

ARGUMENTS
       w         Specifies the widget.

DESCRIPTION
       If the widget is already realized, XtRealizeWidget simply
       returns.  Otherwise, it performs the following:

       +o    Binds all action names in the widget's translation
            table to procedures (see Section 10.1.2).

       +o    Makes a post-order traversal of the widget tree
            rooted at the specified widget and calls the
            change_managed procedure of each composite widget
            that has one or more managed children.

       +o    Constructs an XSetWindowAttributes structure filled
            in with information derived from the Core widget
            fields and calls the realize procedure for the wid-
            get, which adds any widget-specific attributes and
            creates the X window.

       +o    If the widget is not a subclass of
            compositeWidgetClass, XtRealizeWidget returns; other-
            wise, it continues and performs the following:

            -    Descends recursively to each of the widget's
                 managed children and calls the realize proce-
                 dures.  Primitive widgets that instantiate chil-
                 dren are responsible for realizing those chil-
                 dren themselves.

            -    Maps all of the managed children windows that
                 have mapped_when_managed True.  (If a widget is
                 managed but mapped_when_managed is False, the
                 widget is allocated visual space but is not dis-
                 played.  Some people seem to like this to indi-
                 cate certain states.)

       If the widget is a top-level shell widget (that is, it has
       no parent), and mapped_when_managed is True,

       XtRealizeWidget maps the widget window.

       The XtIsRealized function returns True if the widget has
       been realized, that is, if the widget has a nonzero X win-
       dow ID.

       Some widget procedures (for example, set_values) might
       wish to operate differently after the widget has been
       realized.

       The XtUnrealizeWidget function destroys the windows of an
       existing widget and all of its children (recursively down
       the widget tree).  To recreate the windows at a later
       time, call XtRealizeWidget again.  If the widget was man-
       aged, it will be unmanaged automatically before its window
       is freed.

SEE ALSO
       XtManageChildren(3Xt) 
       X Toolkit Intrinsics - C Language Interface
       Xlib - C Language X Interface