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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 */
#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