| Allegro CL version 6.2 Unrevised from 6.1 | |||||||||
Arguments: window menu
Called whenever a menu is about to be made visible. window is the owning window. menu is the menu about to be displayed.
The default method calls about-to-show-menu recursively on the selected child of window. An application may add methods to this generic function in order to modify a menu that is about to be shown, making it suitable for the current context. This is most useful for pull-down menus, since they are not invoked by application code that could otherwise modify the menu before invoking it. You might, for example, want to make certain menu-items unavailable when the menu is displayed because the items are not meaningful in the current environment. The menu command Cut should typically be unavailable when nothing is selected, for example.
See cg-events.htm for information about event handling in Common Graphics. See also the menu chapter in the IDE User Guide, which has examples using this function.
Copyright (c) 1998-2002, Franz Inc. Oakland, CA., USA. All rights reserved.
Documentation for Allegro CL version 6.2. This page was not revised from the 6.1 page.
Created 2002.2.26.
| Allegro CL version 6.2 Unrevised from 6.1 | |||||||||