| // Copyright 2016 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 NGBox_h |
| #define NGBox_h |
| |
| #include "core/layout/LayoutBox.h" |
| #include "core/CoreExport.h" |
| #include "platform/heap/Handle.h" |
| |
| namespace blink { |
| |
| class ComputedStyle; |
| class LayoutBox; |
| class NGBlockLayoutAlgorithm; |
| class NGConstraintSpace; |
| class NGFragment; |
| |
| // Represents a node to be laid out. |
| class CORE_EXPORT NGBox final : public GarbageCollected<NGBox> { |
| public: |
| explicit NGBox(LayoutObject*); |
| |
| // Returns true when done; when this function returns false, it has to be |
| // called again. The out parameter will only be set when this function |
| // returns true. The same constraint space has to be passed each time. |
| // TODO(layout-ng): Should we have a StartLayout function to avoid passing |
| // the same space for each Layout iteration? |
| bool Layout(const NGConstraintSpace*, NGFragment**); |
| const ComputedStyle* Style() const; |
| |
| NGBox* NextSibling() const; |
| |
| NGBox* FirstChild() const; |
| |
| // This is necessary for interop between old and new trees -- after our parent |
| // positions us, it calls this function so we can store the position on the |
| // underlying LayoutBox. |
| void PositionUpdated(const NGFragment&); |
| |
| DEFINE_INLINE_VIRTUAL_TRACE() { visitor->trace(algorithm_); } |
| |
| private: |
| bool CanUseNewLayout(); |
| |
| LayoutBox* layout_box_; |
| Member<NGBlockLayoutAlgorithm> algorithm_; |
| }; |
| |
| } // namespace blink |
| |
| #endif // NGBox_h |