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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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20
Libraries/LibWeb/Layout/BoxModelMetrics.cpp
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@@ -46,4 +46,24 @@ BoxModelMetrics::PixelBox BoxModelMetrics::full_margin(const LayoutNode& layout_
};
}
BoxModelMetrics::PixelBox BoxModelMetrics::padding_box(const LayoutNode& layout_node) const
{
return {
m_padding.top.to_px(layout_node),
m_padding.right.to_px(layout_node),
m_padding.bottom.to_px(layout_node),
m_padding.left.to_px(layout_node),
};
}
BoxModelMetrics::PixelBox BoxModelMetrics::border_box(const LayoutNode& layout_node) const
{
return {
m_border.top.to_px(layout_node) + m_padding.top.to_px(layout_node),
m_border.right.to_px(layout_node) + m_padding.right.to_px(layout_node),
m_border.bottom.to_px(layout_node) + m_padding.bottom.to_px(layout_node),
m_border.left.to_px(layout_node) + m_padding.left.to_px(layout_node),
};
}
}