pub trait ToComputedValue {
type ComputedValue;
// Required methods
fn to_computed_value(&self, context: &Context<'_>) -> Self::ComputedValue;
fn from_computed_value(computed: &Self::ComputedValue) -> Self;
}Expand description
A trait to represent the conversion between computed and specified values.
This trait is derivable with #[derive(ToComputedValue)]. The derived
implementation just calls ToComputedValue::to_computed_value on each field
of the passed value. The deriving code assumes that if the type isn’t
generic, then the trait can be implemented as simple Clone::clone calls,
this means that a manual implementation with ComputedValue = Self is bogus
if it returns anything else than a clone.
Required Associated Types§
Sourcetype ComputedValue
type ComputedValue
The computed value type we’re going to be converted to.
Required Methods§
Sourcefn to_computed_value(&self, context: &Context<'_>) -> Self::ComputedValue
fn to_computed_value(&self, context: &Context<'_>) -> Self::ComputedValue
Convert a specified value to a computed value, using itself and the data
inside the Context.
Sourcefn from_computed_value(computed: &Self::ComputedValue) -> Self
fn from_computed_value(computed: &Self::ComputedValue) -> Self
Convert a computed value to specified value form.
This will be used for recascading during animation. Such from_computed_valued values should recompute to the same value.
Dyn Compatibility§
This trait is not dyn compatible.
In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.