Desktop Notifications UI (for windows)

chrome/browser/notifications/notification_ui_manager.h

+// Copyright (c) 2009 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 CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_UI_MANAGER_H_
+#define CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_UI_MANAGER_H_
+
+#include <deque>
+
+#include "base/id_map.h"
+#include "base/scoped_ptr.h"
+#include "chrome/browser/notifications/balloons.h"
+
+class Notification;
+class Profile;
+class QueuedNotification;
+class SiteInstance;
+
+typedef std::deque<QueuedNotification*> NotificationDeque;
+
+// The notification manager is a singleton class which manages
+// all aspects of using the desktop for notifications.  It maintains
+// a queue of pending notifications when space becomes constrained.
+class NotificationUIManager : public BalloonCollectionObserver {
+ public:
+  ~NotificationUIManager();
+
+  static NotificationUIManager* Create();
+
+  void Initialize(BalloonCollectionInterface* balloon_collection);
+
+  // Adds a notification to be displayed.
+  void Add(const Notification& notification,
+           Profile* profile, SiteInstance* site_instance);
+
+  // BalloonCollectionObserver implementation.
+  virtual void OnBalloonSpaceChanged();
+
+ private:
+  NotificationUIManager()
+    : balloons_observer_(NULL),
+      balloon_collection_(NULL) {
+  }
+
+  // Attempts to display notifications from the show_queue if the user
+  // is active.
+  void CheckAndShowNotifications();
+
+  // Attempts to display notifications from the show_queue.
+  void ShowNotifications();
+
+  BalloonCollectionObserver* balloons_observer_;
+  scoped_ptr<BalloonCollectionInterface> balloon_collection_;
+  NotificationDeque show_queue_;
+
+  IDMap<NotificationObjectProxy> proxy_map_;
+
+  DISALLOW_COPY_AND_ASSIGN(NotificationUIManager);
+};
+
+#endif  // CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_MANAGER_H_