blob: 233f1d4954df69a019bc9cb69397da1694abab68 [file] [log] [blame]
// 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.
#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 {
// 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) {}
// 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();
friend class MediaSessionImpl;
void StopObserving();
// Weak pointer to MediaSession
MediaSession* media_session_;
} // namespace content