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.
54 lines
1.5 KiB
C++
54 lines
1.5 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 <LibWeb/Layout/InlineFormattingContext.h>
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namespace Web::Layout {
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class LineBuilder {
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AK_MAKE_NONCOPYABLE(LineBuilder);
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AK_MAKE_NONMOVABLE(LineBuilder);
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public:
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LineBuilder(InlineFormattingContext&, FormattingState&);
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~LineBuilder();
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void break_line();
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void append_box(Box const&, float leading_size, float trailing_size);
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void append_text_chunk(TextNode const&, size_t offset_in_node, size_t length_in_node, float leading_size, float trailing_size, float content_width, float content_height);
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void break_if_needed(LayoutMode layout_mode, float next_item_width, bool should_force_break)
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{
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if (should_break(layout_mode, next_item_width, should_force_break))
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break_line();
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}
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float available_width_for_current_line() const { return m_available_width_for_current_line; }
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void update_last_line();
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void remove_last_line_if_empty();
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private:
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void begin_new_line(bool increment_y);
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bool should_break(LayoutMode, float next_item_width, bool should_force_break);
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LineBox& ensure_last_line_box();
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InlineFormattingContext& m_context;
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FormattingState& m_formatting_state;
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FormattingState::NodeState& m_containing_block_state;
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float m_available_width_for_current_line { 0 };
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float m_current_y { 0 };
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float m_max_height_on_current_line { 0 };
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bool m_last_line_needs_update { false };
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};
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}
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