| // 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 THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_NG_NG_OUT_OF_FLOW_LAYOUT_PART_H_ |
| #define THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_NG_NG_OUT_OF_FLOW_LAYOUT_PART_H_ |
| |
| #include "third_party/blink/renderer/core/core_export.h" |
| |
| #include "base/optional.h" |
| #include "third_party/blink/renderer/core/layout/geometry/physical_offset.h" |
| #include "third_party/blink/renderer/core/layout/ng/ng_absolute_utils.h" |
| #include "third_party/blink/renderer/core/layout/ng/ng_constraint_space.h" |
| #include "third_party/blink/renderer/core/style/computed_style_base_constants.h" |
| #include "third_party/blink/renderer/platform/wtf/hash_map.h" |
| #include "third_party/blink/renderer/platform/wtf/hash_set.h" |
| |
| namespace blink { |
| |
| class ComputedStyle; |
| class LayoutBox; |
| class LayoutObject; |
| class NGBlockNode; |
| class NGBoxFragmentBuilder; |
| class NGLayoutResult; |
| class NGPhysicalContainerFragment; |
| struct NGLogicalOutOfFlowPositionedNode; |
| |
| // Helper class for positioning of out-of-flow blocks. |
| // It should be used together with NGBoxFragmentBuilder. |
| // See NGBoxFragmentBuilder::AddOutOfFlowChildCandidate documentation |
| // for example of using these classes together. |
| class CORE_EXPORT NGOutOfFlowLayoutPart { |
| STACK_ALLOCATED(); |
| |
| public: |
| NGOutOfFlowLayoutPart(const NGBlockNode& container_node, |
| const NGConstraintSpace& container_space, |
| NGBoxFragmentBuilder* container_builder); |
| |
| // The |container_builder|, |container_space|, and |container_style| |
| // parameters are all with respect to the containing block of the relevant |
| // out-of-flow positioned descendants. If the CSS "containing block" of such |
| // an out-of-flow positioned descendant isn't a true block (e.g. a relatively |
| // positioned inline instead), the containing block here is the containing |
| // block of said non-block. |
| NGOutOfFlowLayoutPart( |
| bool is_absolute_container, |
| bool is_fixed_container, |
| const ComputedStyle& container_style, |
| const NGConstraintSpace& container_space, |
| NGBoxFragmentBuilder* container_builder, |
| base::Optional<LogicalSize> initial_containing_block_fixed_size = |
| base::nullopt); |
| |
| // Normally this function lays out and positions all out-of-flow objects from |
| // the container_builder and additional ones it discovers through laying out |
| // those objects. However, if only_layout is specified, only that object will |
| // get laid out; any additional ones will be stored as out-of-flow |
| // descendants in the builder for use via |
| // LayoutResult::OutOfFlowPositionedDescendants. |
| void Run(const LayoutBox* only_layout = nullptr); |
| |
| private: |
| // Information needed to position descendant within a containing block. |
| // Geometry expressed here is complicated: |
| // There are two types of containing blocks: |
| // 1) Default containing block (DCB) |
| // Containing block passed in NGOutOfFlowLayoutPart constructor. |
| // It is the block element inside which this algorighm runs. |
| // All OOF descendants not in inline containing block are placed in DCB. |
| // 2) Inline containing block |
| // OOF descendants might be positioned wrt inline containing block. |
| // Inline containing block is positioned wrt default containing block. |
| struct ContainingBlockInfo { |
| STACK_ALLOCATED(); |
| |
| public: |
| // The direction of the container. |
| TextDirection direction; |
| // Logical in containing block coordinates. |
| LogicalSize content_size_for_absolute; |
| // Content size for fixed is different for the ICB. |
| LogicalSize content_size_for_fixed; |
| |
| // Offset of the container's padding-box. |
| LogicalOffset container_offset; |
| |
| LogicalSize ContentSize(EPosition position) const { |
| return position == EPosition::kAbsolute ? content_size_for_absolute |
| : content_size_for_fixed; |
| } |
| }; |
| |
| bool SweepLegacyCandidates(HashSet<const LayoutObject*>* placed_objects); |
| |
| const ContainingBlockInfo& GetContainingBlockInfo( |
| const NGLogicalOutOfFlowPositionedNode&, |
| const NGPhysicalContainerFragment* = nullptr); |
| |
| void ComputeInlineContainingBlocks( |
| const Vector<NGLogicalOutOfFlowPositionedNode>&); |
| |
| void LayoutCandidates(Vector<NGLogicalOutOfFlowPositionedNode>* candidates, |
| const LayoutBox* only_layout, |
| HashSet<const LayoutObject*>* placed_objects); |
| |
| scoped_refptr<const NGLayoutResult> LayoutCandidate( |
| const NGLogicalOutOfFlowPositionedNode&, |
| const LayoutBox* only_layout); |
| |
| void LayoutFragmentainerDescendants( |
| Vector<NGLogicalOutOfFlowPositionedNode>* descendants); |
| |
| scoped_refptr<const NGLayoutResult> LayoutFragmentainerDescendant( |
| const NGLogicalOutOfFlowPositionedNode&); |
| |
| scoped_refptr<const NGLayoutResult> Layout(NGBlockNode, |
| const NGConstraintSpace&, |
| const NGLogicalStaticPosition&, |
| LogicalSize container_content_size, |
| const ContainingBlockInfo&, |
| const WritingMode, |
| const TextDirection, |
| const LayoutBox* only_layout); |
| |
| bool IsContainingBlockForCandidate(const NGLogicalOutOfFlowPositionedNode&); |
| |
| void AddOOFResultToFragmentainer(scoped_refptr<const NGLayoutResult> result, |
| const wtf_size_t index); |
| NGConstraintSpace CreateConstraintSpaceForFragmentainerDescendant( |
| const NGBlockNode& descendant, |
| const LogicalSize& content_size, |
| const LayoutUnit block_offset, |
| const NGConstraintSpace& fragmentainer_constraint_space, |
| const WritingMode default_writing_mode) const; |
| const NGConstraintSpace& GetFragmentainerConstraintSpace( |
| const wtf_size_t index); |
| scoped_refptr<const NGLayoutResult> GenerateFragment( |
| NGBlockNode node, |
| const LogicalSize& container_content_size_in_child_writing_mode, |
| const base::Optional<LayoutUnit>& block_estimate, |
| const NGLogicalOutOfFlowDimensions& node_dimensions); |
| |
| const NGConstraintSpace& container_space_; |
| NGBoxFragmentBuilder* container_builder_; |
| ContainingBlockInfo default_containing_block_; |
| HashMap<const LayoutObject*, ContainingBlockInfo> containing_blocks_map_; |
| HashMap<wtf_size_t, NGConstraintSpace> fragmentainer_constraint_space_map_; |
| const WritingMode writing_mode_; |
| bool is_absolute_container_; |
| bool is_fixed_container_; |
| bool allow_first_tier_oof_cache_; |
| }; |
| |
| } // namespace blink |
| |
| #endif // THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_NG_NG_OUT_OF_FLOW_LAYOUT_PART_H_ |