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// 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 BalloonCollection::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);
// Removes a notification.
virtual bool Cancel(const Notification& notification);
// Returns balloon collection.
BalloonCollection* balloon_collection() {
return balloon_collection_.get();
}
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();
// Replace an existing notification with this one if applicable;
// returns true if the replacement happened.
bool TryReplacement(const Notification& notification);
// 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_
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