Trait Measure 

pub trait Measure {
    // Required methods
    fn measure_intrinsics(
        &mut self,
        leaves: &[LeafRequest<'_>],
    ) -> Vec<Intrinsics>;
    fn measure_heights(
        &mut self,
        leaves: &[LeafRequest<'_>],
        requests: &[HeightRequest],
    ) -> Vec<f32>;

    // Provided method
    fn measure_id(&self) -> u64 { ... }
}

Implemented by the host. Both calls receive batches; the core never calls them per taffy request.

Required Methods

fn measure_intrinsics(&mut self, leaves: &[LeafRequest<'_>]) -> Vec<Intrinsics>

fn measure_heights( &mut self, leaves: &[LeafRequest<'_>], requests: &[HeightRequest], ) -> Vec<f32>

Provided Methods

fn measure_id(&self) -> u64

Identity of this measurer (font scale, Dynamic Type state…). Two consecutive passes with different ids invalidate every memo.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors

impl Measure for FixedMeasure

impl<F: FnMut(&LeafRequest<'_>, Option<f32>) -> (f32, f32)> Measure for DirectMeasure<F>

impl<F: FnMut(&LeafRequest<'_>, Option<f32>) -> (f32, f32, Option<f32>)> Measure for DirectMeasureWithBaseline<F>