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Visual Tagging Tool

Class: Undo/UndoManager

Undo class is the Java Object for undo/redo. UndoManager keeps a Vector of Undo objects for VTT to perform undo/redo operation. The undo object includes:

  • Action
    • ADD (0)
    • CHANGE (1)
    • DELETE (2)
  • Cur (current Markup)
  • Prev (previous Markup)

The UML class diagram is shown below:

Undo/UndoManager UML class diagram

Please refer to undo/redo operation for design details.