XtRealizeWidget(3Xt) XtRealizeWidget(3Xt)
NAME
XtRealizeWidget, XtIsRealized, XtUnrealizeWidget -
realize and unrealize widgets
SYNOPSIS
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.
⊕ 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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XtRealizeWidget(3Xt) 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 Programming Manual
Xlib Programming Manual
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