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layout: Check flow descendants of inline block fragments to find their

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baselines when aligning inline fragments per CSS 2.1 § 10.8.1.
This commit is contained in:
Patrick Walton 2016-04-27 12:44:43 -07:00
parent 8823f87276
commit 04f05349b1
6 changed files with 191 additions and 65 deletions
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45
components/layout/fragment.rs
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@ -1077,7 +1077,7 @@ impl Fragment {
/// Returns the sum of the inline-sizes of all the borders of this fragment. Note that this
/// can be expensive to compute, so if possible use the `border_padding` field instead.
#[inline]
fn border_width(&self) -> LogicalMargin<Au> {
pub fn border_width(&self) -> LogicalMargin<Au> {
let style_border_width = match self.specific {
SpecificFragmentInfo::ScannedText(_) |
SpecificFragmentInfo::InlineBlock(_) => LogicalMargin::zero(self.style.writing_mode),
@ -1983,14 +1983,19 @@ impl Fragment {
}
SpecificFragmentInfo::InlineBlock(ref info) => {
// See CSS 2.1 § 10.8.1.
let block_flow = info.flow_ref.as_block();
let font_style = self.style.get_font_arc();
let font_metrics = text::font_metrics_for_style(&mut layout_context.font_context(),
font_style);
InlineMetrics::from_block_height(&font_metrics,
block_flow.base.position.size.block,
block_flow.fragment.margin.block_start,
block_flow.fragment.margin.block_end)
let flow = &info.flow_ref;
let block_flow = flow.as_block();
let baseline_offset = match flow.baseline_offset_of_last_line_box_in_flow() {
Some(baseline_offset) => baseline_offset,
None => block_flow.fragment.border_box.size.block,
};
let start_margin = block_flow.fragment.margin.block_start;
let end_margin = block_flow.fragment.margin.block_end;
let depth_below_baseline = flow::base(&**flow).position.size.block -
baseline_offset + end_margin;
InlineMetrics::new(baseline_offset + start_margin,
depth_below_baseline,
baseline_offset)
}
SpecificFragmentInfo::InlineAbsoluteHypothetical(_) |
SpecificFragmentInfo::InlineAbsolute(_) => {
@ -2552,6 +2557,28 @@ impl Fragment {
pub fn layer_id_for_overflow_scroll(&self) -> LayerId {
LayerId::new_of_type(LayerType::OverflowScroll, self.node.id() as usize)
}
pub fn is_text_or_replaced(&self) -> bool {
match self.specific {
SpecificFragmentInfo::Generic |
SpecificFragmentInfo::InlineAbsolute(_) |
SpecificFragmentInfo::InlineAbsoluteHypothetical(_) |
SpecificFragmentInfo::InlineBlock(_) |
SpecificFragmentInfo::Multicol |
SpecificFragmentInfo::MulticolColumn |
SpecificFragmentInfo::Table |
SpecificFragmentInfo::TableCell |
SpecificFragmentInfo::TableColumn(_) |
SpecificFragmentInfo::TableRow |
SpecificFragmentInfo::TableWrapper => false,
SpecificFragmentInfo::Canvas(_) |
SpecificFragmentInfo::GeneratedContent(_) |
SpecificFragmentInfo::Iframe(_) |
SpecificFragmentInfo::Image(_) |
SpecificFragmentInfo::ScannedText(_) |
SpecificFragmentInfo::UnscannedText(_) => true
}
}
}
impl fmt::Debug for Fragment {