ash: First pass of Applist v2.

ash/app_list/page_switcher.h

+// 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 ASH_APP_LIST_PAGE_SWITCHER_H_
+#define ASH_APP_LIST_PAGE_SWITCHER_H_
+#pragma once
+
+#include "ash/app_list/pagination_model_observer.h"
+#include "base/basictypes.h"
+#include "ui/views/controls/button/button.h"
+#include "ui/views/view.h"
+
+namespace ash {
+
+class PaginationModel;
+
+class PageSwitcher : public views::View,

[sky, 2012/05/06 22:51:15]

add a description.

[xiyuan, 2012/05/07 16:46:10]

Done.

+                     public views::ButtonListener,
+                     public PaginationModelObserver {
+ public:
+  explicit PageSwitcher(PaginationModel* model);
+  virtual ~PageSwitcher();
+
+ private:
+  // Overridden from views::View:
+  virtual gfx::Size GetPreferredSize() OVERRIDE;
+  virtual void Layout() OVERRIDE;
+
+  // Overridden from views::ButtonListener:
+  virtual void ButtonPressed(views::Button* sender,
+                             const views::Event& event) OVERRIDE;
+
+  // Overridden from PaginationModelObserver:
+  virtual void TotalPagesChanged() OVERRIDE;
+  virtual void SelectedPageChanged(int old_selected, int new_selected) OVERRIDE;
+
+  PaginationModel* model_;  // Owned by parent AppListView.
+  views::View* buttons_;  // Owned by views hierarchy.
+
+  DISALLOW_COPY_AND_ASSIGN(PageSwitcher);
+};
+
+}  // namespace ash
+
+#endif  // ASH_APP_LIST_PAGE_SWITCHER_H_