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LibHTML: Rewrite inline and text layout
Inline layout is now done by LayoutBlock. Blocks with inline children will split them into line boxes during layout. A LayoutBlock can have zero or more LineBox objects. Each LineBox represents one visual line. A LineBox can have any number of LineBoxFragment children. A fragment is an offset+length into a specific LayoutNode. To paint a LayoutBlock with inline children, we walk its line boxes, and walk their fragments, painting each fragment at a time by calling LineBoxFragment::render(), which in turn calls the LayoutNode via LayoutText::render_fragment(). Hit testing works similarly. This is very incomplete and has many bugs, but should make it easier for us to move forward with this code.
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12 changed files with 339 additions and 187 deletions
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Libraries/LibHTML/Layout/LineBox.h
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Libraries/LibHTML/Layout/LineBox.h
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#pragma once
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#include <AK/Vector.h>
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#include <LibHTML/Layout/LineBoxFragment.h>
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class LineBox {
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public:
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LineBox() {}
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int width() const { return m_width; }
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void add_fragment(const LayoutNode& layout_node, int start, int length, int width, int height);
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const Vector<LineBoxFragment>& fragments() const { return m_fragments; }
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Vector<LineBoxFragment>& fragments() { return m_fragments; }
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private:
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Vector<LineBoxFragment> m_fragments;
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int m_width { 0 };
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};
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