1f603c54ff
This patch adds a new mechanism that allows InlineFormattingContext to build line boxes incrementally instead of all-in-one go. Incremental build will eventually allow much better support for CSS floating objects.
64 lines
1.6 KiB
C++
64 lines
1.6 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/Box.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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};
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explicit InlineLevelIterator(Layout::Box& container, LayoutMode layout_mode)
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: m_container(container)
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, m_current_node(container.first_child())
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, m_layout_mode(layout_mode)
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{
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}
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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 enter_text_node(Layout::TextNode&);
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Layout::Box& m_container;
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Layout::Node* m_current_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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TextNode::ChunkIterator chunk_iterator;
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};
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Optional<TextNodeContext> m_text_node_context;
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};
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}
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