XtRealizeWidget, XtIsRealized, XtUnrealizeWidget - realize and unrealize widgets
void XtRealizeWidget(Widget w);
Boolean XtIsRealized(Widget w);
void XtUnrealizeWidget(Widget w);
Specifies the widget.
If the widget is already realized,
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.
structure filled in with information derived from the
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
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
(If a widget is managed but mapped_when_managed is
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
maps the widget window.
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
after the widget has been realized.
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,
If the widget was managed,
it will be unmanaged automatically before its window is freed.
X Toolkit Intrinsics - C Language Interface Xlib - C Language X Interface