1 files changed, 82 insertions, 0 deletions
diff --git a/layout/base/ScrollbarStyles.h b/layout/base/ScrollbarStyles.h
new file mode 100644
index 000000000..e6f0c6dde
--- /dev/null
+++ b/layout/base/ScrollbarStyles.h
@@ -0,0 +1,82 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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 ScrollbarStyles_h
+#define ScrollbarStyles_h
+
+#include <stdint.h>
+#include "nsStyleConsts.h" // for NS_STYLE_SCROLL_SNAP_*
+#include "nsStyleCoord.h" // for nsStyleCoord
+#include "mozilla/dom/WindowBinding.h"
+
+// Forward declarations
+struct nsStyleDisplay;
+
+namespace mozilla {
+
+struct ScrollbarStyles
+{
+  // Always one of NS_STYLE_OVERFLOW_SCROLL, NS_STYLE_OVERFLOW_HIDDEN,
+  // or NS_STYLE_OVERFLOW_AUTO.
+  uint8_t mHorizontal;
+  uint8_t mVertical;
+  // Always one of NS_STYLE_SCROLL_BEHAVIOR_AUTO or
+  // NS_STYLE_SCROLL_BEHAVIOR_SMOOTH
+  uint8_t mScrollBehavior;
+  // Always one of NS_STYLE_SCROLL_SNAP_NONE, NS_STYLE_SCROLL_SNAP_MANDATORY,
+  // or NS_STYLE_SCROLL_SNAP_PROXIMITY.
+  uint8_t mScrollSnapTypeX;
+  uint8_t mScrollSnapTypeY;
+  nsStyleCoord mScrollSnapPointsX;
+  nsStyleCoord mScrollSnapPointsY;
+  nsStyleCoord::CalcValue mScrollSnapDestinationX;
+  nsStyleCoord::CalcValue mScrollSnapDestinationY;
+
+  ScrollbarStyles(uint8_t aH, uint8_t aV)
+    : mHorizontal(aH), mVertical(aV),
+      mScrollBehavior(NS_STYLE_SCROLL_BEHAVIOR_AUTO),
+      mScrollSnapTypeX(NS_STYLE_SCROLL_SNAP_TYPE_NONE),
+      mScrollSnapTypeY(NS_STYLE_SCROLL_SNAP_TYPE_NONE),
+      mScrollSnapPointsX(nsStyleCoord(eStyleUnit_None)),
+      mScrollSnapPointsY(nsStyleCoord(eStyleUnit_None)) {
+
+    mScrollSnapDestinationX.mPercent = 0;
+    mScrollSnapDestinationX.mLength = nscoord(0.0f);
+    mScrollSnapDestinationX.mHasPercent = false;
+    mScrollSnapDestinationY.mPercent = 0;
+    mScrollSnapDestinationY.mLength = nscoord(0.0f);
+    mScrollSnapDestinationY.mHasPercent = false;
+  }
+
+  explicit ScrollbarStyles(const nsStyleDisplay* aDisplay);
+  ScrollbarStyles(uint8_t aH, uint8_t aV, const nsStyleDisplay* aDisplay);
+  ScrollbarStyles() {}
+  bool operator==(const ScrollbarStyles& aStyles) const {
+    return aStyles.mHorizontal == mHorizontal && aStyles.mVertical == mVertical &&
+           aStyles.mScrollBehavior == mScrollBehavior &&
+           aStyles.mScrollSnapTypeX == mScrollSnapTypeX &&
+           aStyles.mScrollSnapTypeY == mScrollSnapTypeY &&
+           aStyles.mScrollSnapPointsX == mScrollSnapPointsX &&
+           aStyles.mScrollSnapPointsY == mScrollSnapPointsY &&
+           aStyles.mScrollSnapDestinationX == mScrollSnapDestinationX &&
+           aStyles.mScrollSnapDestinationY == mScrollSnapDestinationY;
+  }
+  bool operator!=(const ScrollbarStyles& aStyles) const {
+    return !(*this == aStyles);
+  }
+  bool IsHiddenInBothDirections() const {
+    return mHorizontal == NS_STYLE_OVERFLOW_HIDDEN &&
+           mVertical == NS_STYLE_OVERFLOW_HIDDEN;
+  }
+  bool IsSmoothScroll(dom::ScrollBehavior aBehavior) const {
+    return aBehavior == dom::ScrollBehavior::Smooth ||
+             (aBehavior == dom::ScrollBehavior::Auto &&
+               mScrollBehavior == NS_STYLE_SCROLL_BEHAVIOR_SMOOTH);
+  }
+};
+
+} // namespace mozilla
+
+#endif