Пример #1
0
 /** Do the last entry that was undone again. */
 public void redo() {
   if (canRedo()) {
     final HistoryAction entry = redoList.removeLast();
     entry.redo();
     undoList.addLast(entry);
   }
 }
Пример #2
0
 /** Undo the last entry that was added to this history. */
 public void undo() {
   if (canUndo()) {
     final HistoryAction entry = undoList.removeLast();
     entry.undo();
     redoList.addLast(entry);
   }
 }
  /** Executes the action-list and changes the status */
  public void execute() {
    if (_actions.size() == 0) return;

    int type = ((HistoryAction) _actions.get(0))._actionType;
    if (type == HistoryAction.UNDO) {
      // we have to walk backwards because the actions have to be undone in
      // the opposite order
      ListIterator it = _actions.listIterator(_actions.size());
      while (it.hasPrevious()) {
        HistoryAction action = (HistoryAction) it.previous();
        action.performAction();
      }
    } else {
      Iterator it = _actions.iterator();
      while (it.hasNext()) {
        HistoryAction action = (HistoryAction) it.next();
        action.performAction();
      }
    }
  }