undoKey

Type

message

Summary

Sent when the user presses the key combination equivalent to the "Undo" menu item.

Syntax

undoKey

Description

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.

The LiveCode development environment traps the undoKey message, unless "Suspend LiveCode 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.

Examples

on undoKey
  if the optionKey is down then revert -- to last saved version
  else pass undoKey
end undoKey

Related

command: undo

glossary: menu item, key combination, Windows, development environment, message, menu, Mac OS, Unix, keyboard equivalent

message: cutKey, copyKey

object: stack

Compatibility and Support

Introduced

LiveCode 1.0

OS

mac

windows

linux

Platforms

desktop