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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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22
components/layout/fragment.rs
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@ -1701,13 +1701,13 @@ impl Fragment {
&font_style);
InlineMetrics::from_block_height(&font_metrics, block_flow.base.position.size.block)
}
InlineAbsoluteHypotheticalFragment(ref info) => {
// See CSS 2.1 § 10.8.1.
let block_flow = info.flow_ref.get().as_immutable_block();
let font_style = text::computed_style_to_font_style(&*self.style);
let font_metrics = text::font_metrics_for_style(layout_context.font_context(),
&font_style);
InlineMetrics::from_block_height(&font_metrics, block_flow.base.position.size.block)
InlineAbsoluteHypotheticalFragment(_) => {
// Hypothetical boxes take up no space.
InlineMetrics {
block_size_above_baseline: Au(0),
depth_below_baseline: Au(0),
ascent: Au(0),
}
}
_ => {
InlineMetrics {
@ -1719,6 +1719,14 @@ impl Fragment {
}
}
/// Returns true if this fragment is a hypothetical box. See CSS 2.1 § 10.3.7.
pub fn is_hypothetical(&self) -> bool {
match self.specific {
InlineAbsoluteHypotheticalFragment(_) => true,
_ => false,
}
}
/// Returns true if this fragment can merge with another adjacent fragment or false otherwise.
pub fn can_merge_with_fragment(&self, other: &Fragment) -> bool {
match (&self.specific, &other.specific) {