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Add to_computed method for CalcLengthOrPercentage

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* Add to_computed method to calculate `calc()` value with parent size,
if parent container size is `None`, the result will be `None`.
* Add from_option method for `MaybeAuto`, to construct from
`Option<Au>`.
* Update some test case.
This commit is contained in:
石博文 2017-04-20 11:27:19 +08:00
parent 5062c4b117
commit 22f99c71b9
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GPG key ID: FC9610D6400A173C
8 changed files with 47 additions and 32 deletions
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22
components/layout/block.rs
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@ -324,22 +324,20 @@ impl CandidateBSizeIterator {
(LengthOrPercentageOrAuto::Percentage(percent), Some(block_container_block_size)) => {
MaybeAuto::Specified(block_container_block_size.scale_by(percent))
}
(LengthOrPercentageOrAuto::Calc(calc), Some(block_container_block_size)) => {
MaybeAuto::Specified(calc.length() + block_container_block_size.scale_by(calc.percentage()))
(LengthOrPercentageOrAuto::Calc(calc), _) => {
MaybeAuto::from_option(calc.to_computed(block_container_block_size))
}
(LengthOrPercentageOrAuto::Percentage(_), None) |
(LengthOrPercentageOrAuto::Auto, _) |
(LengthOrPercentageOrAuto::Calc(_), _) => MaybeAuto::Auto,
(LengthOrPercentageOrAuto::Auto, _) => MaybeAuto::Auto,
(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::Calc(calc), Some(block_container_block_size)) => {
Some(block_container_block_size.scale_by(calc.percentage()) + calc.length())
(LengthOrPercentageOrNone::Calc(calc), _) => {
calc.to_computed(block_container_block_size)
}
(LengthOrPercentageOrNone::Calc(_), _) |
(LengthOrPercentageOrNone::Percentage(_), None) |
(LengthOrPercentageOrNone::None, _) => None,
(LengthOrPercentageOrNone::Length(length), _) => Some(length),
@ -348,10 +346,9 @@ 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), _) => {
calc.to_computed(block_container_block_size).unwrap_or(Au(0))
}
(LengthOrPercentage::Calc(calc), None) => calc.length(),
(LengthOrPercentage::Percentage(_), None) => Au(0),
(LengthOrPercentage::Length(length), _) => length,
};
@ -1168,15 +1165,14 @@ impl BlockFlow {
let content_block_size = self.fragment.style().content_block_size();
match (content_block_size, containing_block_size) {
(LengthOrPercentageOrAuto::Calc(calc), Some(container_size)) => {
Some(container_size.scale_by(calc.percentage()) + calc.length())
(LengthOrPercentageOrAuto::Calc(calc), _) => {
calc.to_computed(containing_block_size)
}
(LengthOrPercentageOrAuto::Length(length), _) => Some(length),
(LengthOrPercentageOrAuto::Percentage(percent), Some(container_size)) => {
Some(container_size.scale_by(percent))
}
(LengthOrPercentageOrAuto::Percentage(_), None) |
(LengthOrPercentageOrAuto::Calc(_), None) |
(LengthOrPercentageOrAuto::Auto, None) => {
None
}