| // Copyright 2019 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_LAYOUT_STYLE_RETAIN_SCOPE_H_ |
| #define THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_STYLE_RETAIN_SCOPE_H_ |
| |
| #include "third_party/blink/renderer/core/core_export.h" |
| #include "third_party/blink/renderer/platform/wtf/allocator/allocator.h" |
| #include "third_party/blink/renderer/platform/wtf/vector.h" |
| |
| namespace blink { |
| |
| class ComputedStyle; |
| |
| // This class retains references to temporary styles during layout. |
| class CORE_EXPORT StyleRetainScope { |
| STACK_ALLOCATED(); |
| |
| public: |
| StyleRetainScope(); |
| ~StyleRetainScope(); |
| |
| static StyleRetainScope* Current(); |
| |
| // Retain a reference to |style| for the lifetime of |this|. |
| void Retain(const ComputedStyle& style) { |
| styles_retained_during_layout_.push_back(&style); |
| } |
| |
| private: |
| Vector<scoped_refptr<const ComputedStyle>> styles_retained_during_layout_; |
| StyleRetainScope* parent_; |
| }; |
| |
| } // namespace blink |
| |
| #endif // THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_STYLE_RETAIN_SCOPE_H_ |