1 files changed, 54 insertions, 0 deletions
diff --git a/Source/WebCore/Modules/modern-media-controls/media/skip-back-support.js b/Source/WebCore/Modules/modern-media-controls/media/skip-back-support.js
new file mode 100644
index 000000000..ea07c703a
--- /dev/null
+++ b/Source/WebCore/Modules/modern-media-controls/media/skip-back-support.js
@@ -0,0 +1,54 @@
+/*
+ * 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.
+ */
+
+const SkipBackSeconds = 30;
+
+class SkipBackSupport extends MediaControllerSupport
+{
+
+    // Protected
+
+    get control()
+    {
+        return this.mediaController.controls.skipBackButton;
+    }
+
+    get mediaEvents()
+    {
+        return ["durationchange"];
+    }
+
+    buttonWasPressed(control)
+    {
+        const media = this.mediaController.media;
+        media.currentTime = Math.max(media.currentTime - SkipBackSeconds, media.seekable.start(0));
+    }
+
+    syncControl()
+    {
+        this.control.enabled = this.mediaController.media.duration !== Number.POSITIVE_INFINITY;
+    }
+
+}