| // Copyright 2016 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 CONTENT_PUBLIC_BROWSER_MEDIA_SESSION_OBSERVER_H_ |
| #define CONTENT_PUBLIC_BROWSER_MEDIA_SESSION_OBSERVER_H_ |
| |
| #include <set> |
| |
| #include "base/macros.h" |
| #include "base/optional.h" |
| #include "content/common/content_export.h" |
| |
| namespace media_session { |
| namespace mojom { |
| enum class MediaSessionAction; |
| } // namespace mojom |
| } // namespace media_session |
| |
| namespace media_session { |
| struct MediaMetadata; |
| } // namespace media_session |
| |
| namespace content { |
| |
| class MediaSession; |
| |
| // The observer for observing MediaSession events. |
| class CONTENT_EXPORT MediaSessionObserver { |
| public: |
| // Gets the observed MediaSession. Will return null when the session is |
| // destroyed. |
| MediaSession* media_session() const; |
| |
| // Called when the observed MediaSession is being destroyed. Give subclass a |
| // chance to clean up. media_session() will return nullptr after this method |
| // is called. |
| virtual void MediaSessionDestroyed() {} |
| |
| // Called when the observed MediaSession has changed its state. |
| virtual void MediaSessionStateChanged(bool is_controllable, |
| bool is_suspended) {} |
| |
| // Called when the observed MediaSession has changed metadata. |
| virtual void MediaSessionMetadataChanged( |
| const base::Optional<media_session::MediaMetadata>& metadata) {} |
| |
| // Called when the media session action list has changed. |
| virtual void MediaSessionActionsChanged( |
| const std::set<media_session::mojom::MediaSessionAction>& action) {} |
| |
| protected: |
| // Create a MediaSessionObserver and start observing a session. |
| explicit MediaSessionObserver(MediaSession* media_session); |
| // Destruct a MediaSessionObserver and remove it from the session if it's |
| // still observing. |
| virtual ~MediaSessionObserver(); |
| |
| private: |
| friend class MediaSessionImpl; |
| |
| void StopObserving(); |
| |
| // Weak pointer to MediaSession |
| MediaSession* media_session_; |
| |
| DISALLOW_COPY_AND_ASSIGN(MediaSessionObserver); |
| }; |
| |
| } // namespace content |
| |
| #endif // CONTENT_PUBLIC_BROWSER_MEDIA_SESSION_OBSERVER_H_ |