ClassPackage: cgToCDocOverviewCGDocRelNotesFAQIndexPermutedIndex
Allegro CL version 8.2
Unrevised from 8.1 to 8.2.
8.1 version

os-widget-window

The class of all widget-windows 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) 1998-2012, Franz Inc. Oakland, CA., USA. All rights reserved.
Documentation for Allegro CL version 8.2. This page was not revised from the 8.1 page.
Created 2010.1.21.

ToCDocOverviewCGDocRelNotesFAQIndexPermutedIndex
Allegro CL version 8.2
Unrevised from 8.1 to 8.2.
8.1 version