1 files changed, 64 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..6203bcb8fa
--- /dev/null
+++ b/gfx/layers/apz/src/WheelScrollAnimation.cpp
@@ -0,0 +1,64 @@
+/* -*- 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 "nsPoint.h"
+#include "ScrollAnimationBezierPhysics.h"
+
+namespace mozilla {
+namespace layers {
+
+static ScrollAnimationBezierPhysicsSettings SettingsForDeltaType(
+    ScrollWheelInput::ScrollDeltaType aDeltaType) {
+  int32_t minMS = 0;
+  int32_t maxMS = 0;
+
+  switch (aDeltaType) {
+    case ScrollWheelInput::SCROLLDELTA_PAGE:
+      maxMS = clamped(StaticPrefs::general_smoothScroll_pages_durationMaxMS(),
+                      0, 10000);
+      minMS = clamped(StaticPrefs::general_smoothScroll_pages_durationMinMS(),
+                      0, maxMS);
+      break;
+    case ScrollWheelInput::SCROLLDELTA_PIXEL:
+      maxMS = clamped(StaticPrefs::general_smoothScroll_pixels_durationMaxMS(),
+                      0, 10000);
+      minMS = clamped(StaticPrefs::general_smoothScroll_pixels_durationMinMS(),
+                      0, maxMS);
+      break;
+    case ScrollWheelInput::SCROLLDELTA_LINE:
+      maxMS =
+          clamped(StaticPrefs::general_smoothScroll_mouseWheel_durationMaxMS(),
+                  0, 10000);
+      minMS =
+          clamped(StaticPrefs::general_smoothScroll_mouseWheel_durationMinMS(),
+                  0, maxMS);
+      break;
+  }
+
+  // The pref is 100-based int percentage, while mIntervalRatio is 1-based ratio
+  double intervalRatio =
+      ((double)StaticPrefs::general_smoothScroll_durationToIntervalRatio()) /
+      100.0;
+  intervalRatio = std::max(1.0, intervalRatio);
+  return ScrollAnimationBezierPhysicsSettings{minMS, maxMS, intervalRatio};
+}
+
+WheelScrollAnimation::WheelScrollAnimation(
+    AsyncPanZoomController& aApzc, const nsPoint& aInitialPosition,
+    ScrollWheelInput::ScrollDeltaType aDeltaType)
+    : GenericScrollAnimation(aApzc, aInitialPosition,
+                             SettingsForDeltaType(aDeltaType)) {
+  mDirectionForcedToOverscroll =
+      mApzc.mScrollMetadata.GetDisregardedDirection();
+}
+
+}  // namespace layers
+}  // namespace mozilla