widget-set-range

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 range is changed. (The dialog-item is the second argument and its window, the value of (window dialog-item) (see window), 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.

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This page was not revised from the 10.0 page.
Created 2019.8.20.