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// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_UNDO_BOOKMARK_UNDO_SERVICE_H_
#define COMPONENTS_UNDO_BOOKMARK_UNDO_SERVICE_H_
#include <map>
#include "base/scoped_observation.h"
#include "components/bookmarks/browser/base_bookmark_model_observer.h"
#include "components/bookmarks/browser/bookmark_model.h"
#include "components/bookmarks/browser/bookmark_node_data.h"
#include "components/keyed_service/core/keyed_service.h"
#include "components/undo/undo_manager.h"
// BookmarkUndoService --------------------------------------------------------
// BookmarkUndoService is owned by the profile, and is responsible for observing
// BookmarkModel changes in order to provide an undo for those changes.
class BookmarkUndoService : public bookmarks::BaseBookmarkModelObserver,
public KeyedService {
public:
BookmarkUndoService();
BookmarkUndoService(const BookmarkUndoService&) = delete;
BookmarkUndoService& operator=(const BookmarkUndoService&) = delete;
~BookmarkUndoService() override;
// Starts the BookmarkUndoService and register it as a BookmarkModelObserver.
// Calling this method is optional, but the service will be inactive until it
// is called at least once. Must be called at most once.
void StartObservingBookmarkModel(bookmarks::BookmarkModel* model);
UndoManager* undo_manager() { return &undo_manager_; }
// KeyedService:
void Shutdown() override;
// Pushes an undo operation to the stack that allows restoring a deleted
// bookmark. As opposed to other operations, which reach this service via
// BookmarkModelObserver, removals are special-cased to be able to transfer
// ownership of the removed node. Both `parent` and `node` must belong to
// the BookmarkModel previously passed via StartObservingBookmarkModel().
void AddUndoEntryForRemovedNode(
const bookmarks::BookmarkNode* parent,
size_t index,
std::unique_ptr<bookmarks::BookmarkNode> node);
private:
// bookmarks::BaseBookmarkModelObserver:
void BookmarkModelChanged() override {}
void BookmarkModelBeingDeleted() override;
void BookmarkNodeMoved(const bookmarks::BookmarkNode* old_parent,
size_t old_index,
const bookmarks::BookmarkNode* new_parent,
size_t new_index) override;
void BookmarkNodeAdded(const bookmarks::BookmarkNode* parent,
size_t index,
bool added_by_user) override;
void OnWillChangeBookmarkNode(const bookmarks::BookmarkNode* node) override;
void OnWillReorderBookmarkNode(const bookmarks::BookmarkNode* node) override;
void ExtensiveBookmarkChangesBeginning() override;
void ExtensiveBookmarkChangesEnded() override;
void GroupedBookmarkChangesBeginning() override;
void GroupedBookmarkChangesEnded() override;
UndoManager undo_manager_;
base::ScopedObservation<bookmarks::BookmarkModel,
bookmarks::BookmarkModelObserver>
scoped_observation_{this};
};
#endif // COMPONENTS_UNDO_BOOKMARK_UNDO_SERVICE_H_
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