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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.
- #ifndef UI_MESSAGE_CENTER_NOTIFICATION_BLOCKER_H_
- #define UI_MESSAGE_CENTER_NOTIFICATION_BLOCKER_H_
- #include "base/memory/raw_ptr.h"
- #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 {
- public:
- class Observer : public base::CheckedObserver {
- public:
- 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;
- protected:
- MessageCenter* message_center() { return message_center_; }
- void NotifyBlockingStateChanged();
- private:
- base::ObserverList<Observer> observers_;
- raw_ptr<MessageCenter> message_center_; // weak
- };
- typedef std::vector<NotificationBlocker*> NotificationBlockers;
- } // namespace message_center
- #endif // UI_MESSAGE_CENTER_NOTIFICATION_BLOCKER_H_
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