This feature provides 'Undoing' functionality for 'Select All Command', 'Connected Text Tool', etc.

The implementation of the Undo feature highly depends on the following code element(s):

• org.jhotdraw.util.UndoableAdapter.undo()
• org.jhotdraw.util.Undoable.undo()

All of the methods involved in implementing 'Undo':

• are named 'undo'
  
• override method org.jhotdraw.util.UndoableAdapter.undo()
  
• override method org.jhotdraw.util.Undoable.undo().
  
• are a member of a class named 'UndoActivity'
  
• appear with a method that overrides org.jhotdraw.util.Undoable.redo()
  
• appear with a method that overrides org.jhotdraw.util.UndoableAdapter.redo()
  
• appear with a method named 'redo'
  

All but one of the methods involved in implementing 'Undo':

• statically-calls org.jhotdraw.util.UndoableAdapter.undo()
  
• are a member of a class that extends-class org.jhotdraw.util.UndoableAdapter
  
• appear with a method that statically-calls org.jhotdraw.util.UndoableAdapter.UndoableAdapter(DrawingView)
  
• appear with a method that calls org.jhotdraw.util.UndoableAdapter.setRedoable(boolean)
  
• appear with a method that calls org.jhotdraw.util.UndoableAdapter.setUndoable(boolean)
  

All but one of the methods involved in implementing 'Undo':

• are a member of a class created by a method named 'createUndoActivity'

More than 2/3 of the methods appear with a method which calls one or more of the following methods:

• org.jhotdraw.framework.FigureEnumeration.nextFigure()
• org.jhotdraw.util.UndoableAdapter.getAffectedFigures()
  
• org.jhotdraw.framework.FigureEnumeration.hasNextFigure()
• org.jhotdraw.util.UndoableAdapter.isRedoable()

Around half of the methods call one or more of the following methods:

• org.jhotdraw.framework.DrawingView.clearSelection()
• org.jhotdraw.util.UndoableAdapter.getAffectedFigures()
• org.jhotdraw.framework.FigureEnumeration.hasNextFigure()
• org.jhotdraw.util.UndoableAdapter.getDrawingView()