on undoKey
if the optionKey is down then revert -- to last saved version
else pass undoKey
end undoKey
Handle the undoKey message if you want to change the normal Undo process, or prevent use of the Undo keyboard equivalent without changing the menu.
Comments:
The Revolution development environment traps the undoKey message, unless "Suspend Revolution UI" is turned on in the Development menu. This means that the undoKey message is not received by a stack if it's running in the development environment.
The undoKey message is sent when the user presses Command-Z (on Mac OS systems), Control-Z (on Windows systems), Alt-Backspace (on Unix systems), or the keyboard Undo key.
The message is sent to the active (focused) control, or to the current card if no control is focused.
