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// 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 "base/observer_list_types.h"
#include "ui/message_center/message_center_export.h"
#include "ui/message_center/public/cpp/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 : public base::CheckedObserver {
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 should be shown in the message center. Default returns true
// always.
virtual bool ShouldShowNotification(
const Notification& notification) const;
// Returns true if this notification 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 Notification& notification) 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