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// Copyright (c) 2012 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_BOOKMARKS_BOOKMARK_EXPANDED_STATE_TRACKER_H_
#define CHROME_BROWSER_BOOKMARKS_BOOKMARK_EXPANDED_STATE_TRACKER_H_
#include <set>
#include "chrome/browser/bookmarks/base_bookmark_model_observer.h"
class BookmarkModel;
class BookmarkNode;
class PrefService;
// BookmarkExpandedStateTracker is used to track a set of expanded nodes. The
// nodes are persisted in preferences. If an expanded node is removed from the
// model BookmarkExpandedStateTracker removes the node.
class BookmarkExpandedStateTracker : public BaseBookmarkModelObserver {
public:
typedef std::set<const BookmarkNode*> Nodes;
BookmarkExpandedStateTracker(BookmarkModel* bookmark_model,
PrefService* pref_service);
virtual ~BookmarkExpandedStateTracker();
// The set of expanded nodes.
void SetExpandedNodes(const Nodes& nodes);
Nodes GetExpandedNodes();
private:
// BaseBookmarkModelObserver:
virtual void Loaded(BookmarkModel* model, bool ids_reassigned) OVERRIDE;
virtual void BookmarkModelChanged() OVERRIDE;
virtual void BookmarkModelBeingDeleted(BookmarkModel* model) OVERRIDE;
virtual void BookmarkNodeRemoved(BookmarkModel* model,
const BookmarkNode* parent,
int old_index,
const BookmarkNode* node) OVERRIDE;
virtual void BookmarkAllNodesRemoved(BookmarkModel* model) OVERRIDE;
// Updates the value for |prefs::kBookmarkEditorExpandedNodes| from
// GetExpandedNodes().
void UpdatePrefs(const Nodes& nodes);
BookmarkModel* bookmark_model_;
PrefService* pref_service_;
DISALLOW_COPY_AND_ASSIGN(BookmarkExpandedStateTracker);
};
#endif // CHROME_BROWSER_BOOKMARKS_BOOKMARK_EXPANDED_STATE_TRACKER_H_
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