blob: 4bcb36123b54c7d3be0bdb98b81841f29812f458 [file] [log] [blame]
// Copyright 2013 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.
#include "base/observer_list.h"
#include "ui/message_center/message_center_export.h"
#include "ui/message_center/notification.h"
namespace message_center {
class MessageCenter;
// NotificationBlocker manages the availability of notifications based on the
// current system status. Each NotificationBlocker implementation covers a
// single state such as screen lock or fullscreen.
class MESSAGE_CENTER_EXPORT NotificationBlocker {
class Observer {
virtual void OnBlockingStateChanged(NotificationBlocker* blocker) = 0;
explicit NotificationBlocker(MessageCenter* message_center);
virtual ~NotificationBlocker();
void AddObserver(Observer* observer);
void RemoveObserver(Observer* observer);
// Checks the current state and updates the availability.
virtual void CheckState() {}
// Returns true when notifications from |notifier_id| should appear in the
// message center. Default returns true always.
virtual bool ShouldShowNotification(const NotifierId& notifier_id) const;
// Returns true when notifications from |notifier_id| should be shown as
// popups on screen. If it's false, those notifications should be queued.
// When a blocker starts returning false for a notification which is already
// shown as a popup, the notification should be closed as a popup immediately.
virtual bool ShouldShowNotificationAsPopup(
const NotifierId& notifier_id) const = 0;
MessageCenter* message_center() { return message_center_; }
void NotifyBlockingStateChanged();
base::ObserverList<Observer> observers_;
MessageCenter* message_center_; // weak
typedef std::vector<NotificationBlocker*> NotificationBlockers;
} // namespace message_center