| Allegro CL version 8.2 Unrevised from 8.1 to 8.2. 8.1 version |
The class of all widget-window
s that are provided by the
underlying window system or operating system. This class is not
instantiable. An application can usually use the various instantiable
dialog-item
classes (also
called controls or widgets) without concerning itself with their
associated widget-window
classes which are internally instantiated to create the actual windows
that appear on the screen for the logical dialog-items created by the
application.
But if an application needs to intercept low-level window events that
are not exported as one or more of the dialog-item's event-handler
properties, then the application should make subclasses of both the
dialog-item
class and the
associated widget-window
class, and then add the needed methods that specialize on the window
subclass, such as virtual-key-down or mouse-left-down methods. A
widget-device
method also should be added to associate the window class with the
dialog-item class.
In releases prior to 7.0, this class was named by the symbol widget-window
. That
symbol still exists and still names a class, the superclass of os-widget-window
(and
of lisp-widget-window
).
A diagram of window and widget classes is shown in Widget and window classes in cgide.htm.
Copyright (c) 1998-2016, Franz Inc. Oakland, CA., USA. All rights reserved.
This page was not revised from the 8.1 page.
Created 2010.1.21.
| Allegro CL version 8.2 Unrevised from 8.1 to 8.2. 8.1 version |