[Aura] Implement views-based applist.

ui/aura_shell/app_list/app_list_item_model.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_ITEM_MODEL_H_
+#define UI_AURA_SHELL_APP_LIST_APP_LIST_ITEM_MODEL_H_
+#pragma once
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/observer_list.h"
+#include "third_party/skia/include/core/SkBitmap.h"
+#include "ui/aura_shell/aura_shell_export.h"
+
+namespace aura_shell {
+
+class AppListItemModelObserver;
+
+// AppListItemModel provides icon and title to be shown in a TileView and
+// action to be executed when the TileView is activated (clicked or enter
+// key it hit).
+class AURA_SHELL_EXPORT AppListItemModel {
+ public:
+  AppListItemModel(const SkBitmap& icon,
+                   const std::string& title);
+  virtual ~AppListItemModel();
+
+  // Activates the item. |event_flags| holds flags of a mouse/keyboard event
+  // associated with this activation.
+  virtual void Activate(int event_flags);

[sky, 2011/12/14 16:51:33]

This feels better served by a specific interface attached to the view.

[xiyuan, 2011/12/20 00:14:42]

Done.

- Added AppListItemViewListener to propogate activation event back to
AppListView;
- Added an AppListViewDelegate that handles item activation for AppListView;

+
+  // Changes icon and title for the model.
+  void SetIcon(const SkBitmap& icon);
+  void SetTitle(const std::string& title);
+
+  void AddObserver(AppListItemModelObserver* observer);
+  void RemoveObserver(AppListItemModelObserver* observer);
+
+  const SkBitmap& icon() const {
+    return icon_;
+  }
+
+  const std::string& title() const {
+    return title_;
+  }
+
+ private:
+  SkBitmap icon_;
+  std::string title_;
+
+  ObserverList<AppListItemModelObserver> observers_;
+
+  DISALLOW_COPY_AND_ASSIGN(AppListItemModel);
+};
+
+}  // namespace aura_shell
+
+#endif  // #define UI_AURA_SHELL_APP_LIST_APP_LIST_ITEM_MODEL_H_