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108 lines
3.6 KiB
C++
108 lines
3.6 KiB
C++
/*
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* Copyright (c) 2022, Andreas Kling <andreas@ladybird.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Noncopyable.h>
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#include <LibWeb/Layout/BlockContainer.h>
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#include <LibWeb/Layout/LayoutState.h>
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#include <LibWeb/Layout/TextNode.h>
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namespace Web::Layout {
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// This class iterates over all the inline-level objects within an inline formatting context.
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// By repeatedly calling next() with the remaining available width on the current line,
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// it returns an "Item" representing the next piece of inline-level content to be placed on the line.
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class InlineLevelIterator {
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AK_MAKE_NONCOPYABLE(InlineLevelIterator);
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AK_MAKE_NONMOVABLE(InlineLevelIterator);
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public:
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struct Item {
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enum class Type {
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Text,
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Element,
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ForcedBreak,
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AbsolutelyPositionedElement,
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FloatingElement,
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};
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Type type {};
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GC::Ptr<Layout::Node const> node {};
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RefPtr<Gfx::GlyphRun> glyph_run {};
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size_t offset_in_node { 0 };
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size_t length_in_node { 0 };
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CSSPixels width { 0.0f };
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CSSPixels padding_start { 0.0f };
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CSSPixels padding_end { 0.0f };
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CSSPixels border_start { 0.0f };
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CSSPixels border_end { 0.0f };
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CSSPixels margin_start { 0.0f };
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CSSPixels margin_end { 0.0f };
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bool is_collapsible_whitespace { false };
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CSSPixels border_box_width() const
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{
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return border_start + padding_start + width + padding_end + border_end;
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}
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};
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InlineLevelIterator(Layout::InlineFormattingContext&, LayoutState&, Layout::BlockContainer const& containing_block, LayoutState::UsedValues const& containing_block_used_values, LayoutMode);
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Optional<Item> next();
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CSSPixels next_non_whitespace_sequence_width();
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private:
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Optional<Item> next_without_lookahead();
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Gfx::GlyphRun::TextType resolve_text_direction_from_context();
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void skip_to_next();
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void compute_next();
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void enter_text_node(Layout::TextNode const&);
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void enter_node_with_box_model_metrics(Layout::NodeWithStyleAndBoxModelMetrics const&);
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void exit_node_with_box_model_metrics();
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void add_extra_box_model_metrics_to_item(Item&, bool add_leading_metrics, bool add_trailing_metrics);
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HashMap<StringView, u8> shape_features_map() const;
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Gfx::ShapeFeatures create_and_merge_font_features() const;
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Layout::Node const* next_inline_node_in_pre_order(Layout::Node const& current, Layout::Node const* stay_within);
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Layout::InlineFormattingContext& m_inline_formatting_context;
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Layout::LayoutState& m_layout_state;
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GC::Ref<BlockContainer const> m_containing_block;
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LayoutState::UsedValues const& m_containing_block_used_values;
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GC::Ptr<Layout::Node const> m_current_node;
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GC::Ptr<Layout::Node const> m_next_node;
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LayoutMode const m_layout_mode;
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struct TextNodeContext {
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bool do_collapse {};
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bool do_wrap_lines {};
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bool do_respect_linebreaks {};
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bool is_first_chunk {};
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bool is_last_chunk {};
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TextNode::ChunkIterator chunk_iterator;
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Optional<Gfx::GlyphRun::TextType> last_known_direction {};
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};
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Optional<TextNodeContext> m_text_node_context;
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struct ExtraBoxMetrics {
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CSSPixels margin { 0 };
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CSSPixels border { 0 };
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CSSPixels padding { 0 };
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};
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Optional<ExtraBoxMetrics> m_extra_leading_metrics;
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Optional<ExtraBoxMetrics> m_extra_trailing_metrics;
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Vector<GC::Ref<NodeWithStyleAndBoxModelMetrics const>> m_box_model_node_stack;
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Queue<InlineLevelIterator::Item> m_lookahead_items;
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};
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}
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