[Aura] Implement views-based applist.

ui/aura_shell/app_list/app_list_item_group_view.h

Index: ui/aura_shell/app_list/app_list_item_group_view.h
diff --git a/ui/aura_shell/app_list/app_list_item_group_view.h b/ui/aura_shell/app_list/app_list_item_group_view.h
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+++ b/ui/aura_shell/app_list/app_list_item_group_view.h
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+// 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_ITEM_GROUP_VIEW_H_
+#define UI_AURA_SHELL_APP_LIST_APP_LIST_ITEM_GROUP_VIEW_H_
+#pragma once
+
+#include "ui/aura_shell/aura_shell_export.h"
+#include "ui/base/models/list_model_observer.h"
+#include "ui/views/view.h"
+
+namespace aura_shell {
+
+class AppListItemGroupModel;
+class AppListItemViewListener;
+
+// AppListItemGroupView displays its children tiles in a grid.
+class AURA_SHELL_EXPORT AppListItemGroupView
+    : public views::View,
+      public ui::ListModelObserver {
+ public:
+  AppListItemGroupView(AppListItemGroupModel* model,
+                       AppListItemViewListener* listener);
+  virtual ~AppListItemGroupView();
+
+  // Sets tiles per row.
+  void SetTilesPerRow(int tiles_per_row);
+
+  // Gets currently focused tile.
+  views::View* GetFocusedTile();
+
+  // Updates tiles page when a tile gets focus.
+  void UpdateFocusedTile(views::View* tile);
+
+ private:
+  // Updates from model.
+  void Update();
+
+  // Sets focused tile by index.
+  void SetFocusedTileByIndex(int index);
+
+  // Overridden from views::View:
+  virtual bool OnKeyPressed(const views::KeyEvent& 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;
+
+  AppListItemGroupModel* model_;
+  AppListItemViewListener* listener_;
+
+  // Tiles per row.
+  int tiles_per_row_;
+
+  // Index of focused tile view.
+  int focused_index_;
+
+  DISALLOW_COPY_AND_ASSIGN(AppListItemGroupView);
+};
+
+}  // namespace aura_shell
+
+#endif  // UI_AURA_SHELL_APP_LIST_APP_LIST_ITEM_GROUP_VIEW_H_