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https://github.com/RGBCube/serenity
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f2a917229a
Here's roughly how this works: - InlineLevelIterator keeps a nesting stack of inline-level nodes with box model metrics. - When entering a node with box model metrics, we add them to the current "leading metrics". - When exiting a node with box model metrics, we add them to the current "trailing metrics". - Pending leading metrics are consumed by the first fragment added to the line. - Pending trailing metrics are consumed by the last fragment added to the line. Like before, the position of a line box fragment is the top left of its content box. However, fragments are placed horizontally along the line with space inserted for padding and border. InlineNode::paint() now expands the content rect as appropriate when painting background and borders. Note that margins and margin collapsing is not yet implemented. This makes the eyes on ACID2 horizontally centered. :^)
97 lines
2.9 KiB
C++
97 lines
2.9 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* 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&, Layout::BlockContainer&, 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&, bool previous_is_empty_or_ends_in_whitespace);
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void enter_node_with_box_model_metrics(Layout::NodeWithStyleAndBoxModelMetrics&);
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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* next_inline_node_in_pre_order(Layout::Node& current, Layout::Node const* stay_within);
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Layout::InlineFormattingContext& m_inline_formatting_context;
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Layout::BlockContainer& m_container;
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Layout::Node* m_current_node { nullptr };
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Layout::Node* 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&> m_box_model_node_stack;
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};
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}
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