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layout: Implement z-index.

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This commit is contained in:
Patrick Walton 2014-10-02 14:11:04 -07:00
parent eff0de0ce1
commit 01c90d8d6a
9 changed files with 81 additions and 18 deletions
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7
components/layout/construct.rs
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@ -330,12 +330,17 @@ impl<'a> FlowConstructor<'a> {
{
let inline_flow = inline_flow_ref.get_mut().as_inline();
// We must scan for runs before computing minimum ascent and descent because scanning
// for runs might collapse so much whitespace away that only hypothetical fragments
// remain. In that case the inline flow will compute its ascent and descent to be zero.
TextRunScanner::new().scan_for_runs(self.layout_context.font_context(), inline_flow);
let (ascent, descent) =
inline_flow.compute_minimum_ascent_and_descent(self.layout_context.font_context(),
&**node.style());
inline_flow.minimum_block_size_above_baseline = ascent;
inline_flow.minimum_depth_below_baseline = descent;
TextRunScanner::new().scan_for_runs(self.layout_context.font_context(), inline_flow);
}
inline_flow_ref.finish(self.layout_context);