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fix: make SpaceBetween with one element Stretch 🐛 (#813)
When there's just one element, `SpaceBetween` should do the same thing as `Stretch`.
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1 changed files with 40 additions and 1 deletions
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@ -442,7 +442,43 @@ impl Layout {
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.map(|_| Element::constrain(&mut solver, (area_start, area_end)))
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.try_collect()?;
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match layout.flex {
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// If there's just one constraint, it doesn't make sense to use `SpaceBetween`.
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// However, if the user chooses to use `SpaceBetween` we choose `Stretch` instead.
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//
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// Choosing `Stretch` will do this:
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//
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// <---~------80 px------~--->
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// ┌─~────────80 px────────~─┐
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// │ Max(20) │
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// └─~─────────────────────~─┘
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//
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// In CSS the default when you use `flex` is justify to the start. So when there's just one
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// element that's what they do.
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//
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// For us, our default is `Stretch`.
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//
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// Additionally, there's two reasons I think `SpaceBetween` should be `Stretch`.
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//
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// 1. The way to think about it is that we are telling the solver that we want to add a
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// spacer between adjacent elements but make the start of the first element at the start
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// of the area and make the end of the last element at the end of the area. When there's
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// just one element, there's no spacers added, and now the start and ends of the element
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// should match the start and end of the area.
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// 2. This above point is exactly is what constraints are added in the `SpaceBetween` match
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// but we are using `tuple_combinations` and `windows` so when there's just one element
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// and no spacers, it doesn't do anything. If we make that code work for one element,
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// it'll end up doing the same thing as `Stretch`.
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//
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// If we changed our default layout to use `Flex::Start`, there is a case to be made for
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// this to do `Flex::Start` as well.
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//
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let flex = if layout.constraints.len() == 1 && layout.flex == Flex::SpaceBetween {
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Flex::Stretch
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} else {
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layout.flex
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};
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match flex {
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Flex::SpaceBetween => {
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let spacers: Vec<Element> = std::iter::repeat_with(|| {
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Element::constrain(&mut solver, (area_start, area_end))
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@ -1909,6 +1945,9 @@ mod tests {
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#[case::max_left_justified(Max(50), Flex::Start, (0, 50))]
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#[case::max_right_justified(Max(50), Flex::End, (50, 50))]
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#[case::max_center_justified(Max(50), Flex::Center, (25, 50))]
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#[case::spacebetween_becomes_stretch(Min(1), Flex::SpaceBetween, (0, 100))]
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#[case::spacebetween_becomes_stretch_with_max(Max(20), Flex::SpaceBetween, (0, 100))]
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#[case::spacebetween_becomes_stretch_with_fixed(Fixed(20), Flex::SpaceBetween, (0, 100))]
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fn flex_one_constraint(
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#[case] constraint: Constraint,
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#[case] flex: Flex,
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