Struct Offer 

pub struct Offer {
    pub width: Option<i32>,
    pub height: Option<i32>,
}

What a caller can promise a widget about the space it will get.

Not a constraint in the layout-engine sense: there is no minimum, no maximum and nothing to satisfy. It is the one fact a widget may need in order to answer at all — an Alert has no height until it knows the width its text wraps to, and a Rating has no width until it knows how tall its stars are.

None on an axis means the caller cannot promise anything there, which is the usual case and the default.

// "You will get 300 pixels of width; the height is up to you."
let offer = Offer::wide(300);
assert_eq!(offer.width, Some(300));
assert_eq!(offer.height, None);

assert_eq!(Offer::NOTHING, Offer::default());

Fields

width: Option<i32>

The width the caller can promise, if it can promise one.

height: Option<i32>

The height, likewise.

Implementations

impl Offer

pub const NOTHING: Self

Nothing promised on either axis.

pub const fn wide(width: i32) -> Self

This much width, and nothing said about the height.

pub const fn tall(height: i32) -> Self

This much height, and nothing said about the width.

pub const fn exactly(size: Size) -> Self

Both axes promised.

Trait Implementations

impl Clone for Offer

fn clone(&self) -> Offer

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Offer

impl Debug for Offer

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

Formats the value using the given formatter.

impl Default for Offer

fn default() -> Offer

Returns the “default value” for a type.

impl Eq for Offer

impl PartialEq for Offer

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Offer