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Auto merge of #17556 - jyc:inline-metrics-of-block, r=emilio

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layout: Clean up inline_metrics_of_block a little.

Previously the variable names were a little confusing (ascent was used
for the space_above_baseline in one branch and the and ascent field in
another branch, and was not really the ascent in one). Also add a
small diagram.

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This commit is contained in:
bors-servo 2017-07-05 17:35:49 -07:00 • committed by GitHub
commit 03450ee8e1
1 changed files with 29 additions and 11 deletions
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40
components/layout/fragment.rs
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@ -2158,17 +2158,35 @@ impl Fragment {
let block_flow = flow.as_block();
let start_margin = block_flow.fragment.margin.block_start;
let end_margin = block_flow.fragment.margin.block_end;
if style.get_box().overflow_y == overflow_x::T::visible {
if let Some(baseline_offset) = flow.baseline_offset_of_last_line_box_in_flow() {
let ascent = baseline_offset + start_margin;
let space_below_baseline = block_flow.fragment.border_box.size.block -
baseline_offset + end_margin;
return InlineMetrics::new(ascent, space_below_baseline, baseline_offset)
}
}
let ascent = block_flow.fragment.border_box.size.block + end_margin;
let space_above_baseline = start_margin + ascent;
InlineMetrics::new(space_above_baseline, Au(0), ascent)
let border_box_block_size = block_flow.fragment.border_box.size.block;
// --------
// margin
// top -------- + +
// | |
// | |
// A ..pogo.. | + baseline_offset_of_last_line_box_in_flow()
// |
// -------- + border_box_block_size
// margin
// B --------
//
// § 10.8.1 says that the baseline (and thus ascent, which is the
// distance from the baseline to the top) should be A if it has an
// in-flow line box and if overflow: visible, and B otherwise.
let ascent =
match (flow.baseline_offset_of_last_line_box_in_flow(),
style.get_box().overflow_y) {
// Case A
(Some(baseline_offset), overflow_x::T::visible) => baseline_offset,
// Case B
_ => border_box_block_size + end_margin,
};
let space_below_baseline = border_box_block_size + end_margin - ascent;
let space_above_baseline = ascent + start_margin;
InlineMetrics::new(space_above_baseline, space_below_baseline, ascent)
}
}