1 files changed, 59 insertions, 0 deletions
diff --git a/gfx/layers/apz/src/GenericScrollAnimation.h b/gfx/layers/apz/src/GenericScrollAnimation.h
new file mode 100644
index 0000000000..56a64dc5ec
--- /dev/null
+++ b/gfx/layers/apz/src/GenericScrollAnimation.h
@@ -0,0 +1,59 @@
+/* -*- 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_GenericScrollAnimation_h_
+#define mozilla_layers_GenericScrollAnimation_h_
+
+#include "AsyncPanZoomAnimation.h"
+
+namespace mozilla {
+
+struct ScrollAnimationBezierPhysicsSettings;
+class ScrollAnimationPhysics;
+
+namespace layers {
+
+class AsyncPanZoomController;
+
+class GenericScrollAnimation : public AsyncPanZoomAnimation {
+ public:
+  GenericScrollAnimation(AsyncPanZoomController& aApzc,
+                         const nsPoint& aInitialPosition,
+                         const ScrollAnimationBezierPhysicsSettings& aSettings);
+
+  bool DoSample(FrameMetrics& aFrameMetrics,
+                const TimeDuration& aDelta) override;
+
+  bool HandleScrollOffsetUpdate(const Maybe<CSSPoint>& aRelativeDelta) override;
+
+  void UpdateDelta(TimeStamp aTime, const nsPoint& aDelta,
+                   const nsSize& aCurrentVelocity);
+  void UpdateDestination(TimeStamp aTime, const nsPoint& aDestination,
+                         const nsSize& aCurrentVelocity);
+
+  CSSPoint GetDestination() const {
+    return CSSPoint::FromAppUnits(mFinalDestination);
+  }
+
+ private:
+  void Update(TimeStamp aTime, const nsSize& aCurrentVelocity);
+
+ protected:
+  AsyncPanZoomController& mApzc;
+  UniquePtr<ScrollAnimationPhysics> mAnimationPhysics;
+  nsPoint mFinalDestination;
+  // If a direction is forced to overscroll, it means it's axis in that
+  // direction is locked, and scroll in that direction is treated as overscroll
+  // of an equal amount, which, for example, may then bubble up a scroll action
+  // to its parent, or may behave as whatever an overscroll occurence requires
+  // to behave
+  Maybe<ScrollDirection> mDirectionForcedToOverscroll;
+};
+
+}  // namespace layers
+}  // namespace mozilla
+
+#endif  // mozilla_layers_GenericScrollAnimation_h_