1 files changed, 56 insertions, 0 deletions
diff --git a/mobile/android/actors/MediaControlDelegateChild.jsm b/mobile/android/actors/MediaControlDelegateChild.jsm
new file mode 100644
index 0000000000..82b78c404b
--- /dev/null
+++ b/mobile/android/actors/MediaControlDelegateChild.jsm
@@ -0,0 +1,56 @@
+/* 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/. */
+
+"use strict";
+
+const { GeckoViewActorChild } = ChromeUtils.importESModule(
+  "resource://gre/modules/GeckoViewActorChild.sys.mjs"
+);
+
+const { XPCOMUtils } = ChromeUtils.importESModule(
+  "resource://gre/modules/XPCOMUtils.sys.mjs"
+);
+
+const lazy = {};
+
+XPCOMUtils.defineLazyModuleGetters(lazy, {
+  MediaUtils: "resource://gre/modules/MediaUtils.jsm",
+});
+
+var EXPORTED_SYMBOLS = ["MediaControlDelegateChild"];
+
+class MediaControlDelegateChild extends GeckoViewActorChild {
+  handleEvent(aEvent) {
+    debug`handleEvent: ${aEvent.type}`;
+
+    switch (aEvent.type) {
+      case "MozDOMFullscreen:Entered":
+      case "MozDOMFullscreen:Exited":
+        this.handleFullscreenChanged();
+        break;
+    }
+  }
+
+  handleFullscreenChanged() {
+    debug`handleFullscreenChanged`;
+
+    const element = this.document.fullscreenElement;
+    const mediaElement = lazy.MediaUtils.findMediaElement(element);
+
+    if (element && !mediaElement) {
+      // Non-media element fullscreen.
+      debug`No fullscreen media element found.`;
+    }
+
+    this.eventDispatcher.sendRequest({
+      type: "GeckoView:MediaSession:Fullscreen",
+      metadata: lazy.MediaUtils.getMetadata(mediaElement) ?? {},
+      enabled: !!element,
+    });
+  }
+}
+
+const { debug } = MediaControlDelegateChild.initLogging(
+  "MediaControlDelegateChild"
+);