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Diffstat (limited to '')
-rw-r--r-- | layout/generic/AnonymousContentKey.h | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/layout/generic/AnonymousContentKey.h b/layout/generic/AnonymousContentKey.h new file mode 100644 index 0000000000..531754fd20 --- /dev/null +++ b/layout/generic/AnonymousContentKey.h @@ -0,0 +1,54 @@ +/* -*- 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/. */ + +/* values to identify particular subtrees of native anonymous content */ + +#ifndef mozilla_AnonymousContentKey_h +#define mozilla_AnonymousContentKey_h + +#include "mozilla/TypedEnumBits.h" +#include <stdint.h> +#include "X11UndefineNone.h" + +namespace mozilla { + +// clang-format off + +// We currently use cached anonymous content styles only for scrollbar parts, +// and we can fit the type of scrollbar part element along with its different +// options (such as orientation, and other attribute values that can affect +// styling) into a uint8_t. +// +// The lower three bits hold a Type_* value identifying the type of +// element, and the remaining bits store Flag_* values. +// +// A value of 0 is used to represent an anonymous content subtree that we don't +// cache styles for. +enum class AnonymousContentKey : uint8_t { + None = 0x00, + + // all + Type_ScrollCorner = 0x01, + Type_Scrollbar = 0x02, + Type_ScrollbarButton = 0x03, + Type_Slider = 0x04, + + // scrollbar, scrollbarbutton, slider + Flag_Vertical = 0x08, + + // scrollbarbutton + Flag_ScrollbarButton_Down = 0x10, + Flag_ScrollbarButton_Bottom = 0x20, + Flag_ScrollbarButton_Decrement = 0x40, +}; + +// clang-format on + +MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(AnonymousContentKey) + +} // namespace mozilla + +#endif // mozilla_AnonymousContentKey_h |