Struct LayoutChild 

pub struct LayoutChild { /* private fields */ }

A direct child layout node available during a measure pass.

Implementations

impl LayoutChild

pub fn measure( &self, scope: &mut MeasureScope<'_>, constraint: &Constraint, ) -> Result<MeasuredChild, MeasurementError>

Measures this child under the given constraint.

The child is borrowed by index from the current measure scope so the metadata map stays uniquely borrowed for the duration of the call.

pub fn probe( &self, scope: &mut MeasureScope<'_>, constraint: &Constraint, ) -> Result<MeasuredChild, MeasurementError>

Probes this child under the given constraint.

A later probe or measure of the same child under the same constraint reuses this result and does not call into the child again. A different constraint is measured normally; only the final Self::measure is recorded for the parent snapshot cache.

pub fn probe_intrinsic( &self, scope: &mut MeasureScope<'_>, constraint: &Constraint, ) -> Result<MeasuredChild, MeasurementError>

Probes natural content dimensions without publishing layout or placements.

Minimum interactive-size padding is excluded. Other layout constraints and content padding still apply. Use this to choose shared visual dimensions before measuring the children normally for interaction. Results and metadata are isolated from the normal layout cache.

pub fn parent_data<T>(&self, scope: &MeasureScope<'_>) -> Option<T>

where T: Clone + Send + Sync + 'static,

Reads a typed parent-data payload from this direct child layout node.

Trait Implementations

impl Clone for LayoutChild

fn clone(&self) -> LayoutChild

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for LayoutChild

impl Eq for LayoutChild

impl Hash for LayoutChild

fn hash<H: Hasher>(&self, state: &mut H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl LayoutPlacementTarget for LayoutChild

impl PartialEq for LayoutChild

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.