XtRealizeWidget(Xt) X Version 11 (Release 5) XtRealizeWidget(Xt)
6 January 1993
Name
XtRealizeWidget - 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. Other-
wise, it performs the following:
+ Binds all action names in the widget's translation table to procedures
(see Section 10.2.2 of X Toolkit Intrinsics - C Language Interface).
+ Makes a post-order traversal of the widget tree rooted at the speci-
fied 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 informa-
tion derived from the Core widget fields and calls the realize pro-
cedure for the widget, which adds any widget-specific attributes and
creates the X window.
+ If the widget is not a subclass of compositeWidgetClass, XtReal-
izeWidget 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(Xt)
X Toolkit Intrinsics - C Language Interface
Xlib - C Language X Interface