| // 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 NGOutOfFlowLayoutPart_h |
| #define NGOutOfFlowLayoutPart_h |
| |
| #include "core/CoreExport.h" |
| |
| #include "core/layout/ng/ng_units.h" |
| #include "core/layout/ng/ng_constraint_space.h" |
| #include "core/layout/ng/ng_absolute_utils.h" |
| #include "core/layout/ng/ng_layout_algorithm.h" |
| #include "platform/heap/Handle.h" |
| #include "wtf/Optional.h" |
| |
| namespace blink { |
| |
| class ComputedStyle; |
| class NGBlockNode; |
| class NGFragmentBase; |
| class NGConstraintSpace; |
| |
| // Helper class for positioning of out-of-flow blocks. |
| // It should be used together with NGFragmentBuilder. |
| // See NGFragmentBuilder::AddOutOfFlowChildCandidate documentation |
| // for example of using these classes together. |
| class CORE_EXPORT NGOutOfFlowLayoutPart |
| : public GarbageCollectedFinalized<NGOutOfFlowLayoutPart> { |
| public: |
| NGOutOfFlowLayoutPart(PassRefPtr<const ComputedStyle>, NGLogicalSize); |
| |
| // If false, this fragment should be passed up the tree for layout by |
| // an ancestor. |
| bool StartLayout(NGBlockNode*, const NGStaticPosition&); |
| NGLayoutStatus Layout(NGFragmentBase**, NGLogicalOffset*); |
| |
| DECLARE_TRACE(); |
| |
| private: |
| bool ComputeInlineSizeEstimate(); |
| bool ComputeBlockSizeEstimate(); |
| bool ComputeNodeFragment(); |
| |
| bool contains_fixed_; |
| bool contains_absolute_; |
| |
| enum State { |
| kComputeInlineEstimate, |
| kPartialPosition, |
| kComputeBlockEstimate, |
| kFullPosition, |
| kGenerateFragment, |
| kDone |
| }; |
| State state_; |
| |
| NGStaticPosition static_position_; |
| NGLogicalOffset parent_offset_; |
| NGPhysicalOffset parent_physical_offset_; |
| Member<NGConstraintSpace> parent_space_; |
| Member<NGBlockNode> node_; |
| Member<NGConstraintSpace> node_space_; |
| Member<NGFragmentBase> node_fragment_; |
| NGAbsolutePhysicalPosition node_position_; |
| Optional<LayoutUnit> inline_estimate_; |
| Optional<LayoutUnit> block_estimate_; |
| }; |
| |
| } // namespace blink |
| |
| #endif |