Move undo files into //components/undo

chrome/browser/undo/undo_manager.h

-// Copyright 2013 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef CHROME_BROWSER_UNDO_UNDO_MANAGER_H_
-#define CHROME_BROWSER_UNDO_UNDO_MANAGER_H_
-
-#include "base/basictypes.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/memory/scoped_vector.h"
-#include "base/observer_list.h"
-#include "base/strings/string16.h"
-
-class UndoManagerObserver;
-class UndoOperation;
-
-// UndoGroup ------------------------------------------------------------------
-
-// UndoGroup represents a user action and stores all the operations that
-// make that action.  Typically there is only one operation per UndoGroup.
-class UndoGroup {
- public:
-  UndoGroup();
-  ~UndoGroup();
-
-  void AddOperation(scoped_ptr<UndoOperation> operation);
-  const std::vector<UndoOperation*>& undo_operations() {
-    return operations_.get();
-  }
-  void Undo();
-
-  // The resource string id describing the undo and redo action.
-  int get_undo_label_id() const { return undo_label_id_; }
-  void set_undo_label_id(int label_id) { undo_label_id_ = label_id; }
-
-  int get_redo_label_id() const { return redo_label_id_; }
-  void set_redo_label_id(int label_id) { redo_label_id_ = label_id; }
-
- private:
-  ScopedVector<UndoOperation> operations_;
-
-  // The resource string id describing the undo and redo action.
-  int undo_label_id_;
-  int redo_label_id_;
-
-  DISALLOW_COPY_AND_ASSIGN(UndoGroup);
-};
-
-// UndoManager ----------------------------------------------------------------
-
-// Maintains user actions as a group of operations that store enough info to
-// undo and redo those operations.
-class UndoManager {
- public:
-  UndoManager();
-  ~UndoManager();
-
-  // Perform an undo or redo operation.
-  void Undo();
-  void Redo();
-
-  size_t undo_count() const { return undo_actions_.size(); }
-  size_t redo_count() const { return redo_actions_.size(); }
-
-  base::string16 GetUndoLabel() const;
-  base::string16 GetRedoLabel() const;
-
-  void AddUndoOperation(scoped_ptr<UndoOperation> operation);
-
-  // Group multiple operations into one undoable action.
-  void StartGroupingActions();
-  void EndGroupingActions();
-
-  // Suspend undo tracking while processing non-user initiated changes such as
-  // profile synchonization.
-  void SuspendUndoTracking();
-  void ResumeUndoTracking();
-  bool IsUndoTrakingSuspended() const;
-
-  // Returns all UndoOperations that are awaiting Undo or Redo. Note that
-  // ownership of the UndoOperations is retained by UndoManager.
-  std::vector<UndoOperation*> GetAllUndoOperations() const;
-
-  // Remove all undo and redo operations. Note that grouping of actions and
-  // suspension of undo tracking states are left unchanged.
-  void RemoveAllOperations();
-
-  // Observers are notified when the internal state of this class changes.
-  void AddObserver(UndoManagerObserver* observer);
-  void RemoveObserver(UndoManagerObserver* observer);
-
- private:
-  void Undo(bool* performing_indicator,
-            ScopedVector<UndoGroup>* active_undo_group);
-  bool is_user_action() const { return !performing_undo_ && !performing_redo_; }
-
-  // Notifies the observers that the undo manager's state has changed.
-  void NotifyOnUndoManagerStateChange();
-
-  // Handle the addition of |new_undo_group| to the active undo group container.
-  void AddUndoGroup(UndoGroup* new_undo_group);
-
-  // Returns the undo or redo UndoGroup container that should store the next
-  // change taking into account if an undo or redo is being executed.
-  ScopedVector<UndoGroup>* GetActiveUndoGroup();
-
-  // Containers of user actions ready for an undo or redo treated as a stack.
-  ScopedVector<UndoGroup> undo_actions_;
-  ScopedVector<UndoGroup> redo_actions_;
-
-  // The observers to notify when internal state changes.
-  ObserverList<UndoManagerObserver> observers_;
-
-  // Supports grouping operations into a single undo action.
-  int group_actions_count_;
-
-  // The container that is used when actions are grouped.
-  scoped_ptr<UndoGroup> pending_grouped_action_;
-
-  // The action that is in the process of being undone.
-  UndoGroup* undo_in_progress_action_;
-
-  // Supports the suspension of undo tracking.
-  int undo_suspended_count_;
-
-  // Set when executing Undo or Redo so that incoming changes are correctly
-  // processed.
-  bool performing_undo_;
-  bool performing_redo_;
-
-  DISALLOW_COPY_AND_ASSIGN(UndoManager);
-};
-
-#endif  // CHROME_BROWSER_UNDO_UNDO_MANAGER_H_