1 files changed, 73 insertions, 0 deletions
diff --git a/dom/media/mediacontrol/MediaControlKeyManager.h b/dom/media/mediacontrol/MediaControlKeyManager.h
new file mode 100644
index 0000000000..feb857e335
--- /dev/null
+++ b/dom/media/mediacontrol/MediaControlKeyManager.h
@@ -0,0 +1,73 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef DOM_MEDIA_MEDIACONTROL_MEDIACONTROLKEYMANAGER_H_
+#define DOM_MEDIA_MEDIACONTROL_MEDIACONTROLKEYMANAGER_H_
+
+#include "MediaControlKeySource.h"
+#include "MediaEventSource.h"
+#include "nsIObserver.h"
+
+namespace mozilla::dom {
+
+/**
+ * MediaControlKeyManager is a wrapper of MediaControlKeySource, which
+ * is used to manage creating and destroying a real media keys event source.
+ *
+ * It monitors the amount of the media controller in MediaService, and would
+ * create the event source when there is any existing controller and destroy it
+ * when there is no controller.
+ */
+class MediaControlKeyManager final : public MediaControlKeySource,
+                                     public MediaControlKeyListener {
+ public:
+  NS_INLINE_DECL_REFCOUNTING(MediaControlKeyManager, override)
+
+  MediaControlKeyManager();
+
+  // MediaControlKeySource methods
+  bool Open() override;
+  void Close() override;
+  bool IsOpened() const override;
+
+  void SetPlaybackState(MediaSessionPlaybackState aState) override;
+  MediaSessionPlaybackState GetPlaybackState() const override;
+
+  // MediaControlKeyListener methods
+  void OnActionPerformed(const MediaControlAction& aAction) override;
+
+  void SetMediaMetadata(const MediaMetadataBase& aMetadata) override;
+  void SetSupportedMediaKeys(const MediaKeysArray& aSupportedKeys) override;
+  void SetEnableFullScreen(bool aIsEnabled) override;
+  void SetEnablePictureInPictureMode(bool aIsEnabled) override;
+  void SetPositionState(const PositionState& aState) override;
+
+ private:
+  ~MediaControlKeyManager();
+  void Shutdown();
+
+  class Observer final : public nsIObserver {
+   public:
+    NS_DECL_ISUPPORTS
+    NS_DECL_NSIOBSERVER
+    explicit Observer(MediaControlKeyManager* aManager);
+
+   protected:
+    virtual ~Observer() = default;
+
+    MediaControlKeyManager* MOZ_OWNING_REF mManager;
+  };
+  RefPtr<Observer> mObserver;
+  void OnPreferenceChange();
+
+  bool StartMonitoringControlKeys();
+  void StopMonitoringControlKeys();
+  RefPtr<MediaControlKeySource> mEventSource;
+  MediaMetadataBase mMetadata;
+  nsTArray<MediaControlKey> mSupportedKeys;
+};
+
+}  // namespace mozilla::dom
+
+#endif