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// Copyright 2016 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 COMPONENTS_READING_LIST_CORE_READING_LIST_MODEL_OBSERVER_H_
#define COMPONENTS_READING_LIST_CORE_READING_LIST_MODEL_OBSERVER_H_
#include <set>
#include <vector>
#include "components/reading_list/core/reading_list_entry.h"
class GURL;
class ReadingListModel;
// Observer for the Reading List model. In the observer methods care should be
// taken to not modify the model.
class ReadingListModelObserver {
public:
// Invoked when the model has finished loading. Until this method is called it
// is unsafe to use the model.
virtual void ReadingListModelLoaded(const ReadingListModel* model) = 0;
// Invoked when the batch updates are about to start. It will only be called
// once before ReadingListModelCompletedBatchUpdates, even if several updates
// are taking place at the same time.
virtual void ReadingListModelBeganBatchUpdates(
const ReadingListModel* model) {}
// Invoked when the batch updates have completed. This is called once all
// batch updates are completed.
virtual void ReadingListModelCompletedBatchUpdates(
const ReadingListModel* model) {}
// Invoked from the destructor of the model. The model is no longer valid
// after this call. There is no need to call RemoveObserver on the model from
// here, as the observers are automatically deleted.
virtual void ReadingListModelBeingDeleted(const ReadingListModel* model) {}
// Invoked when elements are about to be removed from the read or unread list.
virtual void ReadingListWillRemoveEntry(const ReadingListModel* model,
const GURL& url) {}
// Invoked when elements |MarkEntryUpdated| is called on an entry. This means
// that the order of the entry may change and read/unread list may change
// too.
virtual void ReadingListWillMoveEntry(const ReadingListModel* model,
const GURL& url) {}
// Invoked when elements |MarkEntryUpdated| has been called on an entry. This
// means that the order of the entry may have changed and read/unread list may
// have changed too.
virtual void ReadingListDidMoveEntry(const ReadingListModel* model,
const GURL& url) {}
// Invoked when elements are added.
virtual void ReadingListWillAddEntry(const ReadingListModel* model,
const ReadingListEntry& entry) {}
// Invoked when elements have been added. This method is called after the
// the entry has been added to the model and the entry can now be retrieved
// from the model.
// |source| says where the entry came from.
virtual void ReadingListDidAddEntry(const ReadingListModel* model,
const GURL& url,
reading_list::EntrySource source) {}
// Invoked when an entry is about to change.
virtual void ReadingListWillUpdateEntry(const ReadingListModel* model,
const GURL& url) {}
// Called after all the changes signaled by calls to the "Will" methods are
// done. All the "Will" methods are called as necessary, then the changes
// are applied and then this method is called.
virtual void ReadingListDidApplyChanges(ReadingListModel* model) {}
protected:
ReadingListModelObserver() {}
virtual ~ReadingListModelObserver() {}
DISALLOW_COPY_AND_ASSIGN(ReadingListModelObserver);
};
#endif // COMPONENTS_READING_LIST_CORE_READING_LIST_MODEL_OBSERVER_H_
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