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-rw-r--r--layout/base/ScrollStyles.h44
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diff --git a/layout/base/ScrollStyles.h b/layout/base/ScrollStyles.h
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+/* -*- 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_ScrollStyles_h
+#define mozilla_ScrollStyles_h
+
+#include <stdint.h>
+
+// Forward declarations
+struct nsStyleDisplay;
+
+namespace mozilla {
+
+enum class StyleOverflow : uint8_t;
+
+struct ScrollStyles {
+ // Always one of Scroll, Hidden, or Auto.
+ StyleOverflow mHorizontal;
+ StyleOverflow mVertical;
+
+ ScrollStyles(StyleOverflow aH, StyleOverflow aV);
+
+ // NOTE: This ctor maps `visible` to `auto` and `clip` to `hidden`.
+ // It's used for styles that are propagated from the <body> and for
+ // scroll frames (which we create also for overflow:clip/visible in
+ // some cases, e.g. form controls).
+ enum MapOverflowToValidScrollStyleTag { MapOverflowToValidScrollStyle };
+ ScrollStyles(const nsStyleDisplay&, MapOverflowToValidScrollStyleTag);
+
+ bool operator==(const ScrollStyles& aStyles) const {
+ return aStyles.mHorizontal == mHorizontal && aStyles.mVertical == mVertical;
+ }
+ bool operator!=(const ScrollStyles& aStyles) const {
+ return !(*this == aStyles);
+ }
+ bool IsHiddenInBothDirections() const;
+};
+
+} // namespace mozilla
+
+#endif // mozilla_ScrollStyles_h