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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.
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

View file

@ -3,6 +3,7 @@
#include <LibHTML/Layout/LayoutNode.h>
class Element;
class LayoutBlock;
class LayoutInline : public LayoutNode {
public:
@ -14,5 +15,7 @@ public:
virtual void layout() override;
virtual void split_into_lines(LayoutBlock& container);
private:
};