Add WebNotificationTray to the status area

ash/system/web_notification/web_notification_tray.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_SYSTEM_NOTIFICATION_WEB_NOTIFICATION_TRAY_H_
+#define ASH_SYSTEM_NOTIFICATION_WEB_NOTIFICATION_TRAY_H_
+#pragma once
+
+#include "ash/ash_export.h"
+#include "ash/system/tray/tray_background_view.h"
+#include "base/gtest_prod_util.h"
+#include "ui/aura/event_filter.h"
+
+namespace aura {
+class LocatedEvent;
+}
+
+namespace gfx {
+class ImageSkia;
+}
+
+namespace views {
+class ImageView;
+}
+
+namespace ash {
+
+namespace internal {
+class StatusAreaWidget;
+class WebNotificationList;
+}
+
+// Status area tray for showing browser and app notifications. The client
+// (e.g. Chrome) calls [Add|Remove|Update]Notification to create and update
+// notifications in the tray. It can also implement Delegate to receive
+// callbacks when a notification is removed (closed), clicked on, or a menu
+// item is triggered.
+//
+// Note: These are not related to system notifications (i.e NotificationView
+// generated by SystemTrayItem). Visibility of one notification type or other
+// is controlled by StatusAreaWidget.
+
+class ASH_EXPORT WebNotificationTray : public aura::EventFilter,
+                                       public internal::TrayBackgroundView {
+ public:
+  class Delegate {
+   public:
+    virtual ~Delegate() {}
+
+    // Called when the notification associated with |notification_id| is
+    // removed (i.e. closed by the user).
+    virtual void NotificationRemoved(const std::string& notifcation_id) = 0;
+
+    // Request to disable the extension associated with |notification_id|.
+    virtual void DisableExtension(const std::string& notifcation_id) = 0;
+
+    // Request to disable notifications from the source of |notification_id|.
+    virtual void DisableNotificationsFromSource(
+        const std::string& notifcation_id) = 0;
+
+    // Request to show the notification settings (|notification_id| is used
+    // to identify the requesting browser context).
+    virtual void ShowSettings(const std::string& notifcation_id) = 0;
+
+    // Called when the notification body is clicked on.
+    virtual void OnClicked(const std::string& notifcation_id) = 0;
+  };
+
+  explicit WebNotificationTray(internal::StatusAreaWidget* status_area_widget);
+  virtual ~WebNotificationTray();
+
+  // Called once to set the delegate.
+  void SetDelegate(Delegate* delegate);
+
+  // Add a new notification. |id| is a unique identifier, used to update or
+  // remove notifications. |title| and |meesage| describe the notification text.
+  // Use SetNotificationImage to set the icon image. If |extension_id| is
+  // provided then 'Disable extension' will appear in a dropdown menu and the
+  // id will be used to disable notifications from the extension. Otherwise if
+  // |display_source| is provided, a menu item showing the source and allowing
+  // notifications from that source to be disabled will be shown. All actual
+  // disabling is handled by the Delegate.
+  void AddNotification(const std::string& id,
+                       const string16& title,
+                       const string16& message,
+                       const string16& display_source,
+                       const std::string& extension_id);
+
+  // Update an existing notification.
+  void UpdateNotification(const std::string& id,
+                          const string16& title,
+                          const string16& message);
+
+  // Remove an existing notification and notify the delegate.
+  void RemoveNotification(const std::string& id);
+
+  // Remove all notifications and notify the delegate.
+  void RemoveAllNotifications();
+
+  // Set the notification image.
+  void SetNotificationImage(const std::string& id,
+                            const gfx::ImageSkia& image);
+
+  // Disable all notifications matching notification |id|.
+  void DisableByExtension(const std::string& id);
+  void DisableByUrl(const std::string& id);
+
+  // Show the notification bubble. Should only be called by StatusAreaWidget.
+  void ShowBubble();
+
+  // Hide the notification bubble. Should only be called by StatusAreaWidget.
+  void HideBubble();
+
+  // Request the Delegate to the settings dialog.
+  void ShowSettings(const std::string& id);
+
+  // Called when a notification is clicked on. Event is passed to the Delegate.
+  void OnClicked(const std::string& id);
+
+  // Overridden from aura::EventFilter.
+  virtual bool PreHandleKeyEvent(aura::Window* target,
+                                 aura::KeyEvent* event) OVERRIDE;
+  virtual bool PreHandleMouseEvent(aura::Window* target,
+                                   aura::MouseEvent* event) OVERRIDE;
+  virtual ui::TouchStatus PreHandleTouchEvent(aura::Window* target,
+                                              aura::TouchEvent* event) OVERRIDE;
+  virtual ui::GestureStatus PreHandleGestureEvent(
+      aura::Window* target,
+      aura::GestureEvent* event) OVERRIDE;
+
+  // Overridden from TrayBackgroundView.
+  virtual void SetShelfAlignment(ShelfAlignment alignment) OVERRIDE;
+
+  // Overridden from internal::ActionableView.
+  virtual bool PerformAction(const views::Event& event) OVERRIDE;
+
+ private:
+  class Bubble;
+  class BubbleContentsView;
+  FRIEND_TEST_ALL_PREFIXES(WebNotificationTrayTest, WebNotifications);
+
+  int GetNotificationCount() const;
+  void UpdateIcon();
+  void UpdateBubbleAndIcon();
+  bool ProcessLocatedEvent(const aura::LocatedEvent& event);
+
+  const internal::WebNotificationList* notification_list() const {
+    return notification_list_.get();
+  }
+  views::View* tray_container() const { return tray_container_; }
+  Bubble* bubble() const { return bubble_.get(); }
+
+  internal::StatusAreaWidget* status_area_widget_;  // Unowned parent.
+  scoped_ptr<internal::WebNotificationList> notification_list_;
+  scoped_ptr<Bubble> bubble_;
+  views::View* tray_container_;
+  views::ImageView* icon_;
+  Delegate* delegate_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebNotificationTray);
+};
+
+}  // namespace ash
+
+#endif  // ASH_SYSTEM_NOTIFICATION_WEB_NOTIFICATION_TRAY_H_