Struct LazySize

pub(crate) struct LazySize<'a> {
    result: OnceCell<Au>,
    data: Option<LazySizeData<'a>>,
}

Represents a size that can’t be fully resolved until the intrinsic size is known. This is useful in the block axis, since the intrinsic size depends on layout, but the other inputs are known beforehand.

Fields

result: OnceCell<Au>

data: Option<LazySizeData<'a>>

Implementations

impl<'a> LazySize<'a>

pub(crate) fn new( sizes: &'a Sizes, axis: Direction, automatic_size: Size<Au>, get_automatic_minimum_size: fn() -> Au, stretch_size: Option<Au>, is_table: bool, ) -> Self

pub(crate) fn intrinsic() -> Self

Creates a LazySize that will resolve to the intrinsic size. Should be equivalent to LazySize::new() with default parameters, but avoiding the trouble of getting a reference to a Sizes::default() which lives long enough.

TODO: It’s not clear what this should do if/when LazySize::resolve() is changed to accept a ContentSizes as the intrinsic size.

pub(crate) fn resolve(&self, get_content_size: impl FnOnce() -> Au) -> Au

Resolves the LazySize into Au, caching the result. The argument is a callback that computes the intrinsic size lazily.

TODO: The intrinsic size should probably be a ContentSizes instead of Au.

Trait Implementations

impl From<Au> for LazySize<'_>

fn from(value: Au) -> Self

Creates a LazySize that will resolve to the given Au, ignoring the intrinsic size.