[Aura] Implement views-based applist.

ui/aura_shell/app_list/app_list_groups_view.h

+// Copyright (c) 2011 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 UI_AURA_SHELL_APP_LIST_APP_LIST_GROUPS_VIEW_H_
+#define UI_AURA_SHELL_APP_LIST_APP_LIST_GROUPS_VIEW_H_
+#pragma once
+
+#include <string>
+#include <vector>
+
+#include "ui/aura_shell/aura_shell_export.h"
+#include "ui/base/models/list_model_observer.h"
+#include "ui/views/controls/button/button.h"
+#include "ui/views/view.h"
+
+namespace views {
+class BoundsAnimator;
+}
+
+namespace aura_shell {
+
+class AppListItemGroupView;
+class AppListItemViewListener;
+class AppListModel;
+
+// AppListGroupsView displays the UI for an AppListModel. If there are more than
+// one group in the model , a button strip is displayed to allow user to switch
+// between pages.
+class AURA_SHELL_EXPORT AppListGroupsView : public views::View,
+                                            public views::ButtonListener,
+                                            public ui::ListModelObserver {
+ public:
+  AppListGroupsView(AppListModel* model,
+                    AppListItemViewListener* listener);
+  virtual ~AppListGroupsView();
+
+  // Gets current focused tile.
+  views::View* GetFocusedTile() const;
+
+ private:
+  // Updates from model.
+  void Update();
+
+  // Adds a result group page.
+  void AddPage(const std::string& title, AppListItemGroupView* page);
+
+  // Gets preferred number of tiles per row.
+  int GetPreferredTilesPerRow() const;
+
+  // Gets current result page.
+  AppListItemGroupView* GetCurrentPageView() const;
+
+  // Sets current result page.
+  void SetCurrentPage(int page);
+
+  // Overridden from views::View:
+  virtual void Layout() OVERRIDE;
+  virtual bool OnKeyPressed(const views::KeyEvent& event) OVERRIDE;
+
+  // Overridden from views::ButtonListener:
+  virtual void ButtonPressed(views::Button* sender,
+                             const views::Event& event) OVERRIDE;
+
+  // Overridden from ListModelObserver:
+  virtual void ListItemsAdded(int start, int count) OVERRIDE;
+  virtual void ListItemsRemoved(int start, int count) OVERRIDE;
+  virtual void ListItemsChanged(int start, int count) OVERRIDE;
+
+  AppListModel* model_;  // Owned by parent AppListView.
+  AppListItemViewListener* listener_;
+
+  std::vector<AppListItemGroupView*> pages_;
+  views::View* page_buttons_;
+  int current_page_;
+
+  scoped_ptr<views::BoundsAnimator> animator_;
+
+  DISALLOW_COPY_AND_ASSIGN(AppListGroupsView);
+};
+
+}  // namespace aura_shell
+
+#endif  // UI_AURA_SHELL_APP_LIST_APP_LIST_GROUPS_VIEW_H_