pub struct LayoutContext<'a> {
pub text_measurer: &'a dyn TextMeasurer,
}Expand description
Shared context for a layout pass.
Created once by the caller (platform/view layer) and passed through the entire layout tree. Algorithms read from it, never construct their own dependencies.
Chrome equivalent: combination of Document::GetLayoutView() context
and the font/shaping system accessible through ComputedStyle::GetFont().
Fields§
§text_measurer: &'a dyn TextMeasurerThe text measurer for this layout pass.
Provides text width measurement and font metrics.
Chrome: accessed via Font → CachingWordShaper → HarfBuzzShaper.
The platform layer sets this to the appropriate implementation:
DefaultTextMeasurerfor estimation (no font system yet)- Parley-based measurer when integrated
- Custom measurer for testing
Auto Trait Implementations§
impl<'a> Freeze for LayoutContext<'a>
impl<'a> !RefUnwindSafe for LayoutContext<'a>
impl<'a> !Send for LayoutContext<'a>
impl<'a> !Sync for LayoutContext<'a>
impl<'a> Unpin for LayoutContext<'a>
impl<'a> UnsafeUnpin for LayoutContext<'a>
impl<'a> !UnwindSafe for LayoutContext<'a>
Blanket Implementations§
Source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
Source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
Source§impl<T> IntoEither for T
impl<T> IntoEither for T
Source§fn into_either(self, into_left: bool) -> Either<Self, Self>
fn into_either(self, into_left: bool) -> Either<Self, Self>
Converts
self into a Left variant of Either<Self, Self>
if into_left is true.
Converts self into a Right variant of Either<Self, Self>
otherwise. Read moreSource§fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
Converts
self into a Left variant of Either<Self, Self>
if into_left(&self) returns true.
Converts self into a Right variant of Either<Self, Self>
otherwise. Read moreSource§impl<T> MaybeBoxed<Box<T>> for T
impl<T> MaybeBoxed<Box<T>> for T
Source§fn maybe_boxed(self) -> Box<T>
fn maybe_boxed(self) -> Box<T>
Convert
Source§impl<T> MaybeBoxed<T> for T
impl<T> MaybeBoxed<T> for T
Source§fn maybe_boxed(self) -> T
fn maybe_boxed(self) -> T
Convert