Connect the various pieces for notifications... hook up NotificationUIManager...

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/balloon.h"
+#include "chrome/browser/notifications/balloon_collection.h"
+
+class Notification;
+class Profile;
+class QueuedNotification;
+class SiteInstance;
+
+// The notification manager manages use of the desktop for notifications.
+// It maintains a queue of pending notifications when space becomes constrained.
+class NotificationUIManager :
+    public BalloonCollectionImpl::BalloonSpaceChangeListener {
+ public:
+  NotificationUIManager();
+  virtual ~NotificationUIManager();
+
+  // Creates an initialized UI manager with a new balloon collection
+  // and the listener relationship setup.
+  // Except for unit tests, this is the way to construct the object.
+  static NotificationUIManager* Create();
+
+  // Initializes the UI manager with a balloon collection; this object
+  // takes ownership of the balloon collection.
+  void Initialize(BalloonCollection* balloon_collection) {
+    DCHECK(!balloon_collection_.get());
+    DCHECK(balloon_collection);
+    balloon_collection_.reset(balloon_collection);
+  }
+
+  // Adds a notification to be displayed. Virtual for unit test override.
+  virtual void Add(const Notification& notification,
+                   Profile* profile);
+
+ private:
+  // 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 implementation.
+  virtual void OnBalloonSpaceChanged();
+
+  // An owned pointer to the collection of active balloons.
+  scoped_ptr<BalloonCollection> balloon_collection_;
+
+  // A queue of notifications which are waiting to be shown.
+  typedef std::deque<QueuedNotification*> NotificationDeque;
+  NotificationDeque show_queue_;
+
+  DISALLOW_COPY_AND_ASSIGN(NotificationUIManager);
+};
+
+#endif  // CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_UI_MANAGER_H_