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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 
10 namespace app_list {
11 
12 class 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:
~PaginationModelObserver()27   virtual ~PaginationModelObserver() {}
28 };
29 
30 }  // namespace app_list
31 
32 #endif  // UI_APP_LIST_PAGINATION_MODEL_OBSERVER_H_
33