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flex 2020: Handle positioning flex item based on align-self

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This commit is contained in:
Manish Goregaokar 2020-07-20 14:18:23 -07:00
parent d1b92b68c7
commit ba9448e682
1 changed files with 23 additions and 5 deletions
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28
components/layout_2020/flexbox/layout.rs
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@ -715,7 +715,10 @@ impl FlexLine<'_> {
.items
.iter()
.zip(&item_margins)
.map(|(item, margin)| item.align_along_cross_axis(margin));
.zip(&item_used_cross_sizes)
.map(|((item, margin), size)| {
item.align_along_cross_axis(margin, size, line_cross_size)
});
let item_fragments = self
.items
@ -1149,14 +1152,29 @@ impl FlexItem<'_> {
}
/// Return the coordinate of the cross-start side of the content area
fn align_along_cross_axis(&self, margin: &FlexRelativeSides<Length>) -> Length {
fn align_along_cross_axis(
&self,
margin: &FlexRelativeSides<Length>,
content_size: &Length,
line_cross_size: Length,
) -> Length {
let outer_cross_start =
if self.margin.cross_start.is_auto() || self.margin.cross_end.is_auto() {
Length::zero()
} else {
// FIXME: “Align all flex items along the cross-axis per `align-self`”
// For now we hard-code the behavior of `stretch`:
Length::zero()
match self.align_self {
AlignItems::Stretch | AlignItems::FlexStart => Length::zero(),
AlignItems::FlexEnd => {
let margin_box_cross = *content_size + self.pbm_auto_is_zero.cross;
line_cross_size - margin_box_cross
},
AlignItems::Center => {
let margin_box_cross = *content_size + self.pbm_auto_is_zero.cross;
(line_cross_size - margin_box_cross) / 2.
},
// FIXME: handle baseline alignment
AlignItems::Baseline => Length::zero(),
}
};
outer_cross_start + margin.cross_start + self.border.cross_start + self.padding.cross_start
}