1 files changed, 61 insertions, 0 deletions
diff --git a/gfx/layers/apz/src/SmoothMsdScrollAnimation.h b/gfx/layers/apz/src/SmoothMsdScrollAnimation.h
new file mode 100644
index 0000000000..1f2247c473
--- /dev/null
+++ b/gfx/layers/apz/src/SmoothMsdScrollAnimation.h
@@ -0,0 +1,61 @@
+/* -*- 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_SmoothMsdScrollAnimation_h_
+#define mozilla_layers_SmoothMsdScrollAnimation_h_
+
+#include "AsyncPanZoomAnimation.h"
+#include "mozilla/layers/AxisPhysicsMSDModel.h"
+#include "mozilla/ScrollPositionUpdate.h"
+
+namespace mozilla {
+namespace layers {
+
+class AsyncPanZoomController;
+
+class SmoothMsdScrollAnimation final : public AsyncPanZoomAnimation {
+ public:
+  SmoothMsdScrollAnimation(AsyncPanZoomController& aApzc,
+                           const CSSPoint& aInitialPosition,
+                           const CSSPoint& aInitialVelocity,
+                           const CSSPoint& aDestination, double aSpringConstant,
+                           double aDampingRatio,
+                           ScrollSnapTargetIds&& aSnapTargetIds,
+                           ScrollTriggeredByScript aTriggeredByScript);
+
+  /**
+   * Advances a smooth scroll simulation based on the time passed in |aDelta|.
+   * This should be called whenever sampling the content transform for this
+   * frame. Returns true if the smooth scroll should be advanced by one frame,
+   * or false if the smooth scroll has ended.
+   */
+  bool DoSample(FrameMetrics& aFrameMetrics,
+                const TimeDuration& aDelta) override;
+
+  void SetDestination(const CSSPoint& aNewDestination,
+                      ScrollSnapTargetIds&& aSnapTargetIds,
+                      ScrollTriggeredByScript aTriggeredByScript);
+  CSSPoint GetDestination() const;
+  SmoothMsdScrollAnimation* AsSmoothMsdScrollAnimation() override;
+
+  bool WasTriggeredByScript() const override {
+    return mTriggeredByScript == ScrollTriggeredByScript::Yes;
+  }
+
+  ScrollSnapTargetIds TakeSnapTargetIds() { return std::move(mSnapTargetIds); }
+
+ private:
+  AsyncPanZoomController& mApzc;
+  AxisPhysicsMSDModel mXAxisModel;
+  AxisPhysicsMSDModel mYAxisModel;
+  ScrollSnapTargetIds mSnapTargetIds;
+  ScrollTriggeredByScript mTriggeredByScript;
+};
+
+}  // namespace layers
+}  // namespace mozilla
+
+#endif