1 files changed, 77 insertions, 0 deletions
diff --git a/Source/WebCore/Modules/modern-media-controls/media/controls-visibility-support.js b/Source/WebCore/Modules/modern-media-controls/media/controls-visibility-support.js
new file mode 100644
index 000000000..498fa544d
--- /dev/null
+++ b/Source/WebCore/Modules/modern-media-controls/media/controls-visibility-support.js
@@ -0,0 +1,77 @@
+/*
+ * Copyright (C) 2016 Apple Inc. All Rights Reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+class ControlsVisibilitySupport extends MediaControllerSupport
+{
+
+    constructor(mediaController)
+    {
+        super(mediaController);
+
+        this._controlsAttributeObserver = new MutationObserver(this._updateControls.bind(this));
+        this._controlsAttributeObserver.observe(mediaController.media, { attributes: true, attributeFilter: ["controls"] });
+
+        this._updateControls();
+    }
+
+    // Protected
+
+    destroy()
+    {
+        this._controlsAttributeObserver.disconnect();
+    }
+
+    get mediaEvents()
+    {
+        return ["loadedmetadata", "play", "pause"];
+    }
+
+    get tracksToMonitor()
+    {
+        return [this.mediaController.media.videoTracks];
+    }
+
+    handleEvent()
+    {
+        this._updateControls();
+    }
+
+    // Private
+
+    _updateControls()
+    {
+        const media = this.mediaController.media;
+        const isVideo = media instanceof HTMLVideoElement && media.videoTracks.length > 0;
+        let shouldShowControls = media.controls && !!media.currentSrc;
+        if (isVideo)
+            shouldShowControls = shouldShowControls && media.readyState > HTMLMediaElement.HAVE_NOTHING;
+
+        const controls = this.mediaController.controls;
+        controls.startButton.visible = shouldShowControls;
+        controls.controlsBar.visible = shouldShowControls;
+        controls.controlsBar.fadesWhileIdle = isVideo ? !media.paused : false;
+    }
+
+}