1// Copyright (c) 2012 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef UI_APP_LIST_PAGINATION_MODEL_OBSERVER_H_
6#define UI_APP_LIST_PAGINATION_MODEL_OBSERVER_H_
7
8#include "ui/app_list/app_list_export.h"
9
10namespace app_list {
11
12class APP_LIST_EXPORT PaginationModelObserver {
13 public:
14  // Invoked when the total number of page is changed.
15  virtual void TotalPagesChanged() = 0;
16
17  // Invoked when the selected page index is changed.
18  virtual void SelectedPageChanged(int old_selected, int new_selected) = 0;
19
20  // Invoked when a transition starts.
21  virtual void TransitionStarted() = 0;
22
23  // Invoked when the transition data is changed.
24  virtual void TransitionChanged() = 0;
25
26 protected:
27  virtual ~PaginationModelObserver() {}
28};
29
30}  // namespace app_list
31
32#endif  // UI_APP_LIST_PAGINATION_MODEL_OBSERVER_H_
33