| // Copyright 2014 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef THIRD_PARTY_BLINK_RENDERER_CORE_CSS_CSS_UNSET_VALUE_H_ |
| #define THIRD_PARTY_BLINK_RENDERER_CORE_CSS_CSS_UNSET_VALUE_H_ |
| |
| #include "base/memory/scoped_refptr.h" |
| #include "base/types/pass_key.h" |
| #include "third_party/blink/renderer/core/css/css_value.h" |
| #include "third_party/blink/renderer/platform/wtf/casting.h" |
| |
| namespace blink { |
| |
| class CSSValuePool; |
| |
| namespace cssvalue { |
| |
| class CORE_EXPORT CSSUnsetValue : public CSSValue { |
| public: |
| static CSSUnsetValue* Create(); |
| |
| explicit CSSUnsetValue(base::PassKey<CSSValuePool>) : CSSValue(kUnsetClass) {} |
| |
| String CustomCSSText() const; |
| |
| bool Equals(const CSSUnsetValue&) const { return true; } |
| |
| void TraceAfterDispatch(blink::Visitor* visitor) const { |
| CSSValue::TraceAfterDispatch(visitor); |
| } |
| }; |
| |
| } // namespace cssvalue |
| |
| template <> |
| struct DowncastTraits<cssvalue::CSSUnsetValue> { |
| static bool AllowFrom(const CSSValue& value) { return value.IsUnsetValue(); } |
| }; |
| |
| } // namespace blink |
| |
| #endif // THIRD_PARTY_BLINK_RENDERER_CORE_CSS_CSS_UNSET_VALUE_H_ |