| // 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 "third_party/blink/renderer/core/core_export.h" |
| |
| #include "base/optional.h" |
| #include "third_party/blink/renderer/core/layout/ng/geometry/ng_physical_offset.h" |
| #include "third_party/blink/renderer/core/layout/ng/ng_absolute_utils.h" |
| #include "third_party/blink/renderer/platform/wtf/hash_map.h" |
| |
| namespace blink { |
| |
| class ComputedStyle; |
| class LayoutObject; |
| class NGBlockNode; |
| class NGFragmentBuilder; |
| class NGConstraintSpace; |
| class NGLayoutResult; |
| struct NGOutOfFlowPositionedDescendant; |
| |
| // 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 { |
| STACK_ALLOCATED(); |
| |
| public: |
| NGOutOfFlowLayoutPart(NGFragmentBuilder* container_builder, |
| bool contains_absolute, |
| bool contains_fixed, |
| const NGBoxStrut& scrollbar_sizes, |
| const NGConstraintSpace& container_space, |
| const ComputedStyle& container_style); |
| |
| // 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(LayoutObject* 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(); |
| // Containing block style. |
| const ComputedStyle* style; |
| // Logical in containing block coordinates. |
| NGLogicalSize content_size; |
| // Content offset wrt border box. |
| NGLogicalOffset content_offset; |
| // Physical content offset wrt border box. |
| NGPhysicalOffset content_physical_offset; |
| // Logical offset of container padding box |
| // wrt default containing block padding box. |
| NGLogicalOffset default_container_offset; |
| }; |
| |
| ContainingBlockInfo GetContainingBlockInfo( |
| const NGOutOfFlowPositionedDescendant&) const; |
| |
| void ComputeInlineContainingBlocks(Vector<NGOutOfFlowPositionedDescendant>); |
| |
| scoped_refptr<NGLayoutResult> LayoutDescendant( |
| const NGOutOfFlowPositionedDescendant&, |
| NGLogicalOffset* offset); |
| |
| bool IsContainingBlockForDescendant( |
| const NGOutOfFlowPositionedDescendant& descendant); |
| |
| scoped_refptr<NGLayoutResult> GenerateFragment( |
| NGBlockNode node, |
| const ContainingBlockInfo&, |
| const base::Optional<LayoutUnit>& block_estimate, |
| const NGAbsolutePhysicalPosition& node_position); |
| |
| NGFragmentBuilder* container_builder_; |
| bool contains_absolute_; |
| bool contains_fixed_; |
| NGPhysicalSize icb_size_; |
| ContainingBlockInfo default_containing_block_; |
| HashMap<const LayoutObject*, ContainingBlockInfo> containing_blocks_map_; |
| }; |
| |
| } // namespace blink |
| |
| #endif |