X Version 11 (Release 3) 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:
⊕ 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.)
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X Version 11 (Release 3) XtRealizeWidget(3Xt)
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
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