layout/base/ScrollStyles.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef mozilla_ScrollStyles_h
   8 #define mozilla_ScrollStyles_h
   9
  10 #include <stdint.h>
  11 #include "mozilla/dom/WindowBinding.h"
  12
  13 // Forward declarations
  14 struct nsStyleDisplay;
  15
  16 namespace mozilla {
  17
  18 enum class StyleOverflow : uint8_t;
  19
  20 // NOTE: Only styles that are propagated from the <body> should end up in this
  21 // class.
  22 struct ScrollStyles {
  23   // Always one of Scroll, Hidden, or Auto
  24   StyleOverflow mHorizontal;
  25   StyleOverflow mVertical;
  26
  27   ScrollStyles(StyleOverflow aH, StyleOverflow aV)
  28       : mHorizontal(aH), mVertical(aV) {}
  29
  30   explicit ScrollStyles(const nsStyleDisplay&);
  31   bool operator==(const ScrollStyles& aStyles) const {
  32     return aStyles.mHorizontal == mHorizontal && aStyles.mVertical == mVertical;
  33   }
  34   bool operator!=(const ScrollStyles& aStyles) const {
  35     return !(*this == aStyles);
  36   }
  37   bool IsHiddenInBothDirections() const;
  38 };
  39
  40 }  // namespace mozilla
  41
  42 #endif  // mozilla_ScrollStyles_h