Arguments: widget-window dialog-item new-value old-value recursive-p
This generic function is called by the system when the dialog-item's
window is opened and when its value is changed. (The dialog-item is
the second argument and its window, the value of (window dialog-item),
is the first argument.) This generic function should not be called by
programs and the default method should not be replaced as it updates
the screen to reflect the change in the state of dialog-item and
returns a true value if the new value is
permissible (if it returns nil, the change
will be undone). However, after methods may be added to perform other
program-specific tasks.
recursive-p will be true when this function is called recursively. In that case, the screen may be up to date, and the update function may need to do nothing. This is, however, device-dependent.
Common Graphics and IDE documentation is described in About Common Graphics and IDE documentation in cgide.htm.
The documentation is described in introduction.htm and the index is in index.htm.
Copyright (c) 1998-2000, Franz Inc. Berkeley, CA., USA. All rights reserved.
Created 2000.10.5.