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LibHTML: Rewrite inline and text layout

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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.
This commit is contained in:
Andreas Kling 2019-10-03 15:20:13 +02:00
parent 5966fcff31
commit 1d65cf367f
12 changed files with 339 additions and 187 deletions
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20
Libraries/LibHTML/Layout/LineBox.h Normal file
View file

@ -0,0 +1,20 @@
#pragma once
#include <AK/Vector.h>
#include <LibHTML/Layout/LineBoxFragment.h>
class LineBox {
public:
LineBox() {}
int width() const { return m_width; }
void add_fragment(const LayoutNode& layout_node, int start, int length, int width, int height);
const Vector<LineBoxFragment>& fragments() const { return m_fragments; }
Vector<LineBoxFragment>& fragments() { return m_fragments; }
private:
Vector<LineBoxFragment> m_fragments;
int m_width { 0 };
};