UndoAction (JOSM)

java.lang.Object
- javax.swing.AbstractAction
- - org.openstreetmap.josm.actions.JosmAction
  - - org.openstreetmap.josm.actions.UndoAction

All Implemented Interfaces:

java.awt.event.ActionListener, java.io.Serializable, java.lang.Cloneable, java.util.EventListener, javax.swing.Action, UndoRedoHandler.CommandQueueListener, Destroyable
```
public class UndoAction
extends JosmAction
implements UndoRedoHandler.CommandQueueListener
```
Undoes the last command.

See Also:

Serialized Form

Nested Class Summary
- Nested classes/interfaces inherited from class org.openstreetmap.josm.actions.JosmAction
  JosmAction.ActiveLayerChangeAdapter, JosmAction.LayerChangeAdapter, JosmAction.SelectionChangeAdapter

Field Summary
- Fields inherited from class org.openstreetmap.josm.actions.JosmAction
  sc
- Fields inherited from class javax.swing.AbstractAction
  changeSupport, enabled
- Fields inherited from interface javax.swing.Action
  ACCELERATOR_KEY, ACTION_COMMAND_KEY, DEFAULT, DISPLAYED_MNEMONIC_INDEX_KEY, LARGE_ICON_KEY, LONG_DESCRIPTION, MNEMONIC_KEY, NAME, SELECTED_KEY, SHORT_DESCRIPTION, SMALL_ICON

Constructor Summary

Constructors
Constructor Description

UndoAction()
Construct the action with "Undo" as label.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`actionPerformed(java.awt.event.ActionEvent e)`
`void`	`commandChanged(int queueSize, int redoSize)`	Notifies the listener about the new queue size
`protected void`	`updateEnabledState()`	Override in subclasses to update the enabled state of the action when something in the JOSM state changes, i.e.

Methods inherited from class org.openstreetmap.josm.actions.JosmAction
buildActiveLayerChangeAdapter, buildLayerChangeAdapter, checkAndConfirmOutlyingOperation, destroy, getLayerManager, getShortcut, initEnabledState, installAdapters, listenToLayerChange, listenToSelectionChange, setHelpId, setToolbarId, setTooltip, updateEnabledState, updateEnabledStateOnCurrentSelection, updateEnabledStateOnCurrentSelection, updateEnabledStateOnModifiableSelection, waitFuture

Methods inherited from class javax.swing.AbstractAction
addPropertyChangeListener, clone, firePropertyChange, getKeys, getPropertyChangeListeners, getValue, isEnabled, putValue, removePropertyChangeListener, setEnabled

Methods inherited from class java.lang.Object
equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface javax.swing.Action
accept

- Constructor Detail
  - UndoAction
```
public UndoAction()
```
    Construct the action with "Undo" as label.
- Method Detail
  - actionPerformed
```
public void actionPerformed(java.awt.event.ActionEvent e)
```
    Specified by:
    
    actionPerformed in interface java.awt.event.ActionListener
  - updateEnabledState
```
protected void updateEnabledState()
```
    Description copied from class: JosmAction
    
    Override in subclasses to update the enabled state of the action when something in the JOSM state changes, i.e. when a layer is removed or added. See JosmAction.updateEnabledState(Collection) to respond to changes in the collection of selected primitives. Default behavior is empty.
    
    Overrides:
    
    updateEnabledState in class JosmAction
    
    See Also:
    
    JosmAction.updateEnabledState(Collection), JosmAction.initEnabledState(), JosmAction.listenToLayerChange()
  - commandChanged
```
public void commandChanged(int queueSize,
                           int redoSize)
```
    Description copied from interface: UndoRedoHandler.CommandQueueListener
    
    Notifies the listener about the new queue size
    
    Specified by:
    
    commandChanged in interface UndoRedoHandler.CommandQueueListener
    
    Parameters:
    
    queueSize - Undo stack size
    
    redoSize - Redo stack size