c9700e100e
This patch adds a map of Layout::Node to FormattingState::NodeState. Instead of updating layout nodes incrementally as layout progresses through the formatting contexts, all updates are now written to the corresponding NodeState instead. At the end of layout, FormattingState::commit() is called, which transfers all the values from the NodeState objects to the Node. This will soon allow us to perform completely non-destructive layouts which don't affect the tree. Note that there are many imperfections here, and still many places where we assign to the NodeState, but later read directly from the Node instead. I'm just committing at this stage to make subsequent diffs easier to understand.
98 lines
3 KiB
C++
98 lines
3 KiB
C++
/*
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* Copyright (c) 2022, Andreas Kling <kling@serenityos.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/InlineNode.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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};
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Type type {};
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Layout::Node const* node { nullptr };
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size_t offset_in_node { 0 };
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size_t length_in_node { 0 };
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float width { 0.0f };
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float padding_start { 0.0f };
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float padding_end { 0.0f };
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float border_start { 0.0f };
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float border_end { 0.0f };
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float margin_start { 0.0f };
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float margin_end { 0.0f };
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bool should_force_break { false };
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bool is_collapsible_whitespace { false };
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float 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&, FormattingState&, Layout::BlockContainer const&, LayoutMode);
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Optional<Item> next(float available_width);
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private:
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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&, bool previous_is_empty_or_ends_in_whitespace);
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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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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::FormattingState& m_formatting_state;
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Layout::BlockContainer const& m_container;
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Layout::Node const* m_current_node { nullptr };
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Layout::Node const* m_next_node { nullptr };
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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<TextNode::Chunk> next_chunk {};
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};
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Optional<TextNodeContext> m_text_node_context;
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struct ExtraBoxMetrics {
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float margin { 0 };
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float border { 0 };
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float 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<NodeWithStyleAndBoxModelMetrics const&> m_box_model_node_stack;
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};
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}
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