NAME
XtRealizeWidget, XtIsRealized, XtUnrealizeWidget - realize and
unrealize widgets
SYNTAX
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(3Xt)
X Toolkit Intrinsics - C Language Interface
Xlib - C Language X Interface