AnonymousContentKey.h (1732B)
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 /* values to identify particular subtrees of native anonymous content */ 8 9 #ifndef mozilla_AnonymousContentKey_h 10 #define mozilla_AnonymousContentKey_h 11 12 #include <stdint.h> 13 14 #include "X11UndefineNone.h" 15 #include "mozilla/TypedEnumBits.h" 16 17 namespace mozilla { 18 19 // clang-format off 20 21 // We currently use cached anonymous content styles only for scrollbar parts, 22 // and we can fit the type of scrollbar part element along with its different 23 // options (such as orientation, and other attribute values that can affect 24 // styling) into a uint8_t. 25 // 26 // The lower three bits hold a Type_* value identifying the type of 27 // element, and the remaining bits store Flag_* values. 28 // 29 // A value of 0 is used to represent an anonymous content subtree that we don't 30 // cache styles for. 31 enum class AnonymousContentKey : uint8_t { 32 None = 0x00, 33 34 // all 35 Type_ScrollCorner = 0x01, 36 Type_Scrollbar = 0x02, 37 Type_ScrollbarButton = 0x03, 38 Type_Slider = 0x04, 39 40 // scrollbar, scrollbarbutton, slider 41 Flag_Vertical = 0x08, 42 43 // scrollbarbutton 44 Flag_ScrollbarButton_Down = 0x10, 45 Flag_ScrollbarButton_Bottom = 0x20, 46 Flag_ScrollbarButton_Decrement = 0x40, 47 }; 48 49 // clang-format on 50 51 MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(AnonymousContentKey) 52 53 } // namespace mozilla 54 55 #endif // mozilla_AnonymousContentKey_h