tor-browser

The Tor Browser
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MediaControlKeyManager.h (2343B)

      1 /* This Source Code Form is subject to the terms of the Mozilla Public
      2 * License, v. 2.0. If a copy of the MPL was not distributed with this file,
      3 * You can obtain one at http://mozilla.org/MPL/2.0/. */
      4 
      5 #ifndef DOM_MEDIA_MEDIACONTROL_MEDIACONTROLKEYMANAGER_H_
      6 #define DOM_MEDIA_MEDIACONTROL_MEDIACONTROLKEYMANAGER_H_
      7 
      8 #include "MediaControlKeySource.h"
      9 #include "MediaEventSource.h"
     10 #include "nsIObserver.h"
     11 
     12 namespace mozilla::dom {
     13 
     14 /**
     15 * MediaControlKeyManager is a wrapper of MediaControlKeySource, which
     16 * is used to manage creating and destroying a real media keys event source.
     17 *
     18 * It monitors the amount of the media controller in MediaService, and would
     19 * create the event source when there is any existing controller and destroy it
     20 * when there is no controller.
     21 */
     22 class MediaControlKeyManager final : public MediaControlKeySource,
     23                                     public MediaControlKeyListener {
     24 public:
     25  NS_INLINE_DECL_REFCOUNTING(MediaControlKeyManager, override)
     26 
     27  MediaControlKeyManager();
     28 
     29  // MediaControlKeySource methods
     30  bool Open() override;
     31  void Close() override;
     32  bool IsOpened() const override;
     33 
     34  void SetPlaybackState(MediaSessionPlaybackState aState) override;
     35  MediaSessionPlaybackState GetPlaybackState() const override;
     36 
     37  // MediaControlKeyListener methods
     38  void OnActionPerformed(const MediaControlAction& aAction) override;
     39 
     40  void SetMediaMetadata(const MediaMetadataBase& aMetadata) override;
     41  void SetSupportedMediaKeys(const MediaKeysArray& aSupportedKeys) override;
     42  void SetEnableFullScreen(bool aIsEnabled) override;
     43  void SetEnablePictureInPictureMode(bool aIsEnabled) override;
     44  void SetPositionState(const Maybe<PositionState>& aState) override;
     45 
     46 private:
     47  ~MediaControlKeyManager();
     48  void Shutdown();
     49 
     50  class Observer final : public nsIObserver {
     51   public:
     52    NS_DECL_ISUPPORTS
     53    NS_DECL_NSIOBSERVER
     54    explicit Observer(MediaControlKeyManager* aManager);
     55 
     56   protected:
     57    virtual ~Observer() = default;
     58 
     59    MediaControlKeyManager* MOZ_OWNING_REF mManager;
     60  };
     61  RefPtr<Observer> mObserver;
     62  void OnPreferenceChange();
     63 
     64  bool StartMonitoringControlKeys();
     65  void StopMonitoringControlKeys();
     66  RefPtr<MediaControlKeySource> mEventSource;
     67  MediaMetadataBase mMetadata;
     68  nsTArray<MediaControlKey> mSupportedKeys;
     69 };
     70 
     71 }  // namespace mozilla::dom
     72 
     73 #endif