Struct EmptyMeasurePolicy 

pub struct EmptyMeasurePolicy;

EmptyMeasurePolicy that delegates all measurement to modifier nodes.

This is used when a Layout has no child layout logic - all measurement is handled by modifier nodes (e.g., TextModifierNode for Text widgets). Matches Jetpack Compose’s EmptyMeasurePolicy pattern used in BasicText.

Implementations

impl EmptyMeasurePolicy

pub fn new() -> Self

Trait Implementations

impl Clone for EmptyMeasurePolicy

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for EmptyMeasurePolicy

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for EmptyMeasurePolicy

fn default() -> Self

Returns the “default value” for a type.

impl MeasurePolicy for EmptyMeasurePolicy

fn measure( &self, scope: &dyn MeasureScope, _measurables: &[Box<dyn Measurable>], constraints: Constraints, ) -> MeasureResult

Runs the measurement pass with the provided children and constraints.

fn measure_into( &self, _scope: &dyn MeasureScope, _measurables: &[Box<dyn Measurable>], constraints: Constraints, placements: &mut Vec<Placement>, ) -> Measurement

Runs measurement into caller-owned placement storage.

fn measure_hold( &self, _measurables: &[Box<dyn Measurable>], constraints: Constraints, size: Size, ) -> Option<ConstraintsHold>

The incoming constraints the measure that sized the layout size under constraints holds for, when the policy can tell: see crate::ConstraintsHold. None, the default, holds for constraints alone.

fn min_intrinsic_width( &self, _measurables: &[Box<dyn Measurable>], _height: f32, ) -> f32

Computes the minimum intrinsic width of this policy.

fn max_intrinsic_width( &self, _measurables: &[Box<dyn Measurable>], _height: f32, ) -> f32

Computes the maximum intrinsic width of this policy.

fn min_intrinsic_height( &self, _measurables: &[Box<dyn Measurable>], _width: f32, ) -> f32

Computes the minimum intrinsic height of this policy.

fn max_intrinsic_height( &self, _measurables: &[Box<dyn Measurable>], _width: f32, ) -> f32

Computes the maximum intrinsic height of this policy.

impl PartialEq for EmptyMeasurePolicy

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for EmptyMeasurePolicy