1 files changed, 46 insertions, 0 deletions
diff --git a/gfx/layers/apz/src/WheelScrollAnimation.cpp b/gfx/layers/apz/src/WheelScrollAnimation.cpp
new file mode 100644
index 0000000000..ddc88615de
--- /dev/null
+++ b/gfx/layers/apz/src/WheelScrollAnimation.cpp
@@ -0,0 +1,46 @@
+/* -*- 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/. */
+
+#include "WheelScrollAnimation.h"
+
+#include <tuple>
+#include "AsyncPanZoomController.h"
+#include "mozilla/StaticPrefs_general.h"
+#include "mozilla/layers/APZPublicUtils.h"
+#include "nsPoint.h"
+#include "ScrollAnimationBezierPhysics.h"
+
+namespace mozilla {
+namespace layers {
+
+static ScrollOrigin OriginForDeltaType(
+    ScrollWheelInput::ScrollDeltaType aDeltaType) {
+  switch (aDeltaType) {
+    case ScrollWheelInput::SCROLLDELTA_PAGE:
+      return ScrollOrigin::Pages;
+    case ScrollWheelInput::SCROLLDELTA_PIXEL:
+      return ScrollOrigin::Pixels;
+    case ScrollWheelInput::SCROLLDELTA_LINE:
+      return ScrollOrigin::MouseWheel;
+  }
+  // Shouldn't happen, pick a default.
+  return ScrollOrigin::MouseWheel;
+}
+
+WheelScrollAnimation::WheelScrollAnimation(
+    AsyncPanZoomController& aApzc, const nsPoint& aInitialPosition,
+    ScrollWheelInput::ScrollDeltaType aDeltaType)
+    : GenericScrollAnimation(aApzc, aInitialPosition,
+                             OriginForDeltaType(aDeltaType)) {
+  MOZ_ASSERT(StaticPrefs::general_smoothScroll(),
+             "We shouldn't be creating a WheelScrollAnimation if smooth "
+             "scrolling is disabled");
+  mDirectionForcedToOverscroll =
+      mApzc.mScrollMetadata.GetDisregardedDirection();
+}
+
+}  // namespace layers
+}  // namespace mozilla