Bookmark Undo service for multiple level undo/redo of bookmarks.

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"
 
 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);
   bool has_operations() const {
     return !operations_.empty();
   }
+  void Undo();
 
-  void Undo();
+  template <typename F>
+  void ForEachUndoOperation(F fn) {
+    std::for_each(operations_.begin(), operations_.end(), fn);
+  }
 
  private:
   ScopedVector<UndoOperation> operations_;
 
   DISALLOW_COPY_AND_ASSIGN(UndoGroup);
 };
 
 // UndoManager ----------------------------------------------------------------
 
 // Maintains user actions as a group of operations that store enough info to
@@ skipping 15 matching lines @@
   // 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;
 
+  // Remove all undo and redo operations.
+  void Reset();
+
+  // Applies |fn| to UndoOperations in all UndoGroups.
+  template <typename F>
+  void ForEachUndoOperation(F &fn) {
+    for (ScopedVector<UndoGroup>::iterator it = undo_actions_.begin();
+         it != undo_actions_.end(); ++it) {
+      (*it)->ForEachUndoOperation(fn);
+    }
+    for (ScopedVector<UndoGroup>::iterator it = redo_actions_.begin();
+         it != redo_actions_.end(); ++it) {
+      (*it)->ForEachUndoOperation(fn);
+    }
+  }
+
  private:
   void Undo(bool* performing_indicator,
             ScopedVector<UndoGroup>* active_undo_group);
+  bool is_user_action() const { return !performing_undo_ && !performing_redo_; }
 
-  void RemoveAllActions();
   void RemoveAllRedoActions();
 
   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_;
 
   // 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_;
 
   // 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_