NAME

       XtRealizeWidget, XtIsRealized, XtUnrealizeWidget - realize and unrealize widgets

SYNTAX

       #include <X11/Intrinsic.h>

       void XtRealizeWidget(Widget w);

       Boolean XtIsRealized(Widget w);

       void XtUnrealizeWidget(Widget w);

ARGUMENTS

       w         Specifies the widget.

DESCRIPTION

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

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

       •    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.

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

       •    If the widget is not a subclass of compositeWidgetClass, XtRealizeWidget returns;
            otherwise, it continues and performs the following:

            -    Descends recursively to each of the widget's managed children and calls the
                 realize procedures.  Primitive widgets that instantiate children are responsible
                 for realizing those children 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 displayed.  Some people seem to like this to
                 indicate 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 window 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 managed, it will be unmanaged automatically
       before its window is freed.

SEE ALSO

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