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LibWeb: Some improvements to absolute positioning

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Absolutely positioned blocks now register themselves with their
containing block (and note that the containing block of an absolutely
positioned box is the nearest non-statically positioned block ancestor
or the ICB as fallback.)

Containing blocks then drive the layout of their tracked absolutely
positioned descendants as a separate layout pass.

This is very far from perfect but the general direction seems good.
This commit is contained in:
Andreas Kling 2020-06-12 13:27:28 +02:00
parent ff2c949d70
commit 260427f0ad
8 changed files with 166 additions and 24 deletions
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5
Libraries/LibWeb/Layout/LayoutBlock.h
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@ -65,10 +65,14 @@ public:
virtual void split_into_lines(LayoutBlock& container, LayoutMode) override;
void add_absolutely_positioned_descendant(LayoutBox&);
size_t absolutely_positioned_descendant_count() const { return m_absolutely_positioned_descendants.size(); }
protected:
void compute_width();
void compute_position();
void compute_height();
void layout_absolute_descendants();
private:
virtual bool is_block() const override { return true; }
@ -80,6 +84,7 @@ private:
void layout_block_children(LayoutMode);
Vector<LineBox> m_line_boxes;
HashTable<RefPtr<LayoutBox>> m_absolutely_positioned_descendants;
};
template<typename Callback>