chromium/ui/message_center/message_center_observer.h

// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_MESSAGE_CENTER_MESSAGE_CENTER_OBSERVER_H_
#define UI_MESSAGE_CENTER_MESSAGE_CENTER_OBSERVER_H_

#include <optional>
#include <string>

#include "base/observer_list_types.h"
#include "ui/message_center/message_center_export.h"
#include "ui/message_center/message_center_types.h"

namespace message_center {
class NotificationBlocker;

// An observer class for the change of notifications in the MessageCenter.
// WARNING: It is not safe to modify the message center from within these
// callbacks.
class MESSAGE_CENTER_EXPORT MessageCenterObserver
    : public base::CheckedObserver { … };

}  // namespace message_center

#endif  // UI_MESSAGE_CENTER_MESSAGE_CENTER_OBSERVER_H_