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

chrome/browser/undo/bookmark_undo_service.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_BOOKMARK_UNDO_SERVICE_H_
+#define CHROME_BROWSER_UNDO_BOOKMARK_UNDO_SERVICE_H_
+
+#include <map>
+
+#include "chrome/browser/bookmarks/base_bookmark_model_observer.h"
+#include "chrome/browser/bookmarks/bookmark_node_data.h"
+#include "chrome/browser/undo/undo_manager.h"
+#include "components/browser_context_keyed_service/browser_context_keyed_service.h"
+
+class Profile;
+namespace {
+class BookmarkUndoOperation;
+}  // namespace
+
+// BookmarkUndoService --------------------------------------------------------
+
+// BookmarkUndoService is owned by the profile, and is responsible for observing
+// changes to the BookmarkModel in order to provide an undo for those changes.
+class BookmarkUndoService : public BaseBookmarkModelObserver,
+                            public BrowserContextKeyedService {
+ public:
+  explicit BookmarkUndoService(Profile* profile);
+  virtual ~BookmarkUndoService();
+
+  UndoManager* undo_manager() { return &undo_manager_; }
+
+  // Should be called when a bookmark id has been renumbered so that any
+  // BookmarkUndoOperations that refer to that bookmark can be updated.
+  void OnBookmarkRenumbered(int64 old_id, int64 new_id);

[sky, 2013/08/27 22:24:18]

Can you make this private? Maybe move it into its own interface and pass said
interface to each undo operation when created?

[Tom Cassiotis, 2013/09/04 13:44:43]

I did this by defining BookmarkRenumberObserver.  BookmarkUndoService and
BookmarkUndoOperation are now renumber observers.

BookmarkRemoveOperation notifies BookmarkUndoService when a bookmark is
renumbers which in response notifies all BookmarkUndoOperation instances.

Is this what you had in mind?

+
+ private:
+  // BaseBookmarkModelObserver:
+  virtual void BookmarkModelChanged() OVERRIDE {}
+  virtual void Loaded(BookmarkModel* model, bool ids_reassigned) OVERRIDE;
+  virtual void BookmarkModelBeingDeleted(BookmarkModel* model) OVERRIDE;
+  virtual void BookmarkNodeMoved(BookmarkModel* model,
+                                 const BookmarkNode* old_parent,
+                                 int old_index,
+                                 const BookmarkNode* new_parent,
+                                 int new_index) OVERRIDE;
+  virtual void BookmarkNodeAdded(BookmarkModel* model,
+                                 const BookmarkNode* parent,
+                                 int index) OVERRIDE;
+  virtual void OnWillRemoveBookmarks(BookmarkModel* model,
+                                     const BookmarkNode* parent,
+                                     int old_index,
+                                     const BookmarkNode* node) OVERRIDE;
+  virtual void OnWillRemoveAllBookmarks(BookmarkModel* model) OVERRIDE;
+  virtual void OnWillChangeBookmarkNode(BookmarkModel* model,
+                                        const BookmarkNode* node) OVERRIDE;
+  virtual void OnWillReorderBookmarkNode(BookmarkModel* model,
+                                         const BookmarkNode* node) OVERRIDE;
+
+  Profile* profile_;
+  UndoManager undo_manager_;
+
+  DISALLOW_COPY_AND_ASSIGN(BookmarkUndoService);
+};
+
+#endif  // CHROME_BROWSER_UNDO_BOOKMARK_UNDO_SERVICE_H_