components/undo/undo_operation.h

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef COMPONENTS_UNDO_UNDO_OPERATION_H_
   6 #define COMPONENTS_UNDO_UNDO_OPERATION_H_
   7
   8 // Base class for all undo operations.
   9 class UndoOperation {
  10  public:
  11   virtual ~UndoOperation() {}
  12
  13   virtual void Undo() = 0;
  14
  15   // Returns the resource string id describing the undo/redo of this operation
  16   // for use as labels in the UI.
  17   // Note: The labels describe the original user action, this may result in
  18   // the meaning of the redo label being reversed. For example, an
  19   // UndoOperation representing a deletion would have been created in order to
  20   // redo an addition by the user. In this case, the redo label string for the
  21   // UndoOperation of delete would be "Redo add".
  22   virtual int GetUndoLabelId() const = 0;
  23   virtual int GetRedoLabelId() const = 0;
  24 };
  25
  26 #endif  // COMPONENTS_UNDO_UNDO_OPERATION_H_