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Implement Calc for LengthOrPercentage

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This commit is contained in:
David Zbarsky 2015-08-11 17:20:23 -04:00
parent fa5ad1c6b4
commit 9556141e57
6 changed files with 165 additions and 13 deletions
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9
components/layout/block.rs
View file

@ -331,9 +331,8 @@ impl CandidateBSizeIterator {
(LengthOrPercentageOrAuto::Length(length), _) => MaybeAuto::Specified(length),
};
let max_block_size = match (fragment.style.max_block_size(), block_container_block_size) {
(LengthOrPercentageOrNone::Percentage(percent), Some(block_container_block_size)) => {
Some(block_container_block_size.scale_by(percent))
}
(LengthOrPercentageOrNone::Percentage(percent), Some(block_container_block_size)) =>
Some(block_container_block_size.scale_by(percent)),
(LengthOrPercentageOrNone::Percentage(_), None) |
(LengthOrPercentageOrNone::None, _) => None,
(LengthOrPercentageOrNone::Length(length), _) => Some(length),
@ -342,6 +341,10 @@ impl CandidateBSizeIterator {
(LengthOrPercentage::Percentage(percent), Some(block_container_block_size)) => {
block_container_block_size.scale_by(percent)
}
(LengthOrPercentage::Calc(calc), Some(block_container_block_size)) => {
calc.length() + block_container_block_size.scale_by(calc.percentage())
}
(LengthOrPercentage::Calc(calc), None) => calc.length(),
(LengthOrPercentage::Percentage(_), None) => Au(0),
(LengthOrPercentage::Length(length), _) => length,
};

2
components/layout/display_list_builder.rs
View file

@ -1955,6 +1955,8 @@ fn position_to_offset(position: LengthOrPercentage, Au(total_length): Au) -> f32
fmin(1.0, (length as f32) / (total_length as f32))
}
LengthOrPercentage::Percentage(percentage) => percentage as f32,
LengthOrPercentage::Calc(calc) =>
fmin(1.0, calc.percentage() + (calc.length().0 as f32) / (total_length as f32)),
}
}

7
components/layout/inline.rs
View file

@ -988,7 +988,12 @@ impl InlineFlow {
let percent_offset = line_height.scale_by(p);
offset_from_baseline = offset_from_baseline - percent_offset
}
}
vertical_align::T::Calc(calc) => {
let line_height = fragment.calculate_line_height(layout_context);
let percent_offset = line_height.scale_by(calc.percentage());
offset_from_baseline = offset_from_baseline - percent_offset - calc.length()
}
}
}
(offset_from_baseline - ascent, largest_size_updated)
}

4
components/layout/model.rs
View file

@ -416,7 +416,9 @@ pub fn specified_or_none(length: LengthOrPercentageOrNone, containing_length: Au
pub fn specified(length: LengthOrPercentage, containing_length: Au) -> Au {
match length {
LengthOrPercentage::Length(length) => length,
LengthOrPercentage::Percentage(p) => containing_length.scale_by(p)
LengthOrPercentage::Percentage(p) => containing_length.scale_by(p),
LengthOrPercentage::Calc(calc) =>
containing_length.scale_by(calc.percentage()) + calc.length(),
}
}