JHotDraw 6.0b1

Class UndoCommand

  extended by org.jhotdraw.standard.AbstractCommand
      extended by org.jhotdraw.util.UndoCommand
All Implemented Interfaces:
FigureSelectionListener, Command

public class UndoCommand
extends AbstractCommand

Command to undo the latest change in the drawing. Undo activities can be undone only once, therefore they are not added to the undo stack again (redo activities can be added to the redo stack again, because they can be redone several times, every time pushing a corresponding undo activity as well).

Nested Class Summary
Nested classes/interfaces inherited from class org.jhotdraw.standard.AbstractCommand
Constructor Summary
UndoCommand(java.lang.String name, DrawingEditor newDrawingEditor)
          Constructs a properties command.
Method Summary
 void execute()
          Executes the command.
 boolean isExecutableWithView()
          Used in enabling the undo menu item.
Methods inherited from class org.jhotdraw.standard.AbstractCommand
addCommandListener, createEventDispatcher, createViewChangeListener, dispose, figureSelectionChanged, getDrawingEditor, getEventDispatcher, getUndoActivity, isExecutable, isViewRequired, name, removeCommandListener, setName, setUndoActivity, view, viewCreated, viewDestroying, viewSelectionChanged
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail


public UndoCommand(java.lang.String name,
                   DrawingEditor newDrawingEditor)
Constructs a properties command.

name - the command name
newDrawingEditor - the DrawingEditor which manages the views
Method Detail


public void execute()
Description copied from class: AbstractCommand
Executes the command.

Specified by:
execute in interface Command
execute in class AbstractCommand


public boolean isExecutableWithView()
Used in enabling the undo menu item. Undo menu item will be enabled only when there is atleast one undoable activity registered with UndoManager.

isExecutableWithView in class AbstractCommand

JHotDraw 6.0b1