Struct BorderRadiusDirectional 

pub struct BorderRadiusDirectional {
    pub top_start: f32,
    pub top_end: f32,
    pub bottom_end: f32,
    pub bottom_start: f32,
}

A corner radius named by the reading direction rather than by the wall (border_radius.dart:621).

A BorderRadius says top left. This says top start — the corner where the text begins, which is the left one in English and the right one in Arabic. resolve turns one into the other once the direction is known.

The distinction is not decorative. A drawer rounds its inner edge, the one facing the page: for a leading drawer that is the end side in either direction, and a radius written as right is correct in English and wrong in Arabic. Every asymmetric radius in an interface that mirrors has this question, and answering it by hand at each site is how one of them ends up answered differently.

The reference has one type hierarchy for this (BorderRadiusGeometry, with a resolved and an unresolved subclass); this is two plain types and a resolve, because a widget here is handed a &Theme and so always has a direction available when it needs one.

Fields

top_start: f32

The corner at the top of the line’s beginning.

top_end: f32

The corner at the top of the line’s end.

bottom_end: f32

The corner at the bottom of the line’s end.

bottom_start: f32

The corner at the bottom of the line’s beginning.

Implementations

impl BorderRadiusDirectional

pub const ZERO: Self

No rounding at all.

pub const fn uniform(radius: f32) -> Self

The same radius on all four corners — which needs no direction, and is here so a caller can write one without changing type halfway through an expression.

pub const fn start(radius: f32) -> Self

The two corners at the line’s beginning — the left pair in English, the right pair in Arabic.

pub const fn end(radius: f32) -> Self

The two corners at the line’s end.

pub const fn horizontal(start: f32, end: f32) -> Self

Both sides at once, each with its own radius — the reference’s BorderRadiusDirectional.horizontal.

pub const fn vertical(top: f32, bottom: f32) -> Self

The top pair and the bottom pair. Neither depends on the direction, so this is the same as BorderRadius’s — and is here for the same reason as uniform.

pub const fn resolve(self, direction: TextDirection) -> BorderRadius

The concrete radius, once the direction is known: start becomes left where the text runs left to right, and right where it does not.

Trait Implementations

impl Clone for BorderRadiusDirectional

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for BorderRadiusDirectional

impl Debug for BorderRadiusDirectional

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

Formats the value using the given formatter.

impl Default for BorderRadiusDirectional

fn default() -> Self

Returns the “default value” for a type.

impl From<f32> for BorderRadiusDirectional

fn from(radius: f32) -> Self

Converts to this type from the input type.

impl PartialEq for BorderRadiusDirectional

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for BorderRadiusDirectional