1 files changed, 42 insertions, 0 deletions
diff --git a/gfx/layers/apz/src/AutoscrollAnimation.h b/gfx/layers/apz/src/AutoscrollAnimation.h
new file mode 100644
index 0000000000..a37f6d473a
--- /dev/null
+++ b/gfx/layers/apz/src/AutoscrollAnimation.h
@@ -0,0 +1,42 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 mozilla_layers_AutocrollAnimation_h_
+#define mozilla_layers_AutocrollAnimation_h_
+
+#include "AsyncPanZoomAnimation.h"
+
+namespace mozilla {
+namespace layers {
+
+class AsyncPanZoomController;
+
+class AutoscrollAnimation : public AsyncPanZoomAnimation {
+ public:
+  AutoscrollAnimation(AsyncPanZoomController& aApzc,
+                      const ScreenPoint& aAnchorLocation);
+
+  bool DoSample(FrameMetrics& aFrameMetrics,
+                const TimeDuration& aDelta) override;
+
+  bool HandleScrollOffsetUpdate(
+      const Maybe<CSSPoint>& aRelativeDelta) override {
+    // Autoscroll works using screen space coordinates, so there's no work we
+    // need to do to handle either a relative or an absolute scroll update.
+    return true;
+  }
+
+  void Cancel(CancelAnimationFlags aFlags) override;
+
+ private:
+  AsyncPanZoomController& mApzc;
+  ScreenPoint mAnchorLocation;
+};
+
+}  // namespace layers
+}  // namespace mozilla
+
+#endif  // mozilla_layers_AutoscrollAnimation_h_