Enum FilterChange

#[non_exhaustive]
pub enum FilterChange {
    Different,
    LessStrict,
    MoreStrict,
}

Describes changes in a filter in more detail and allows objects using the filter to optimize refiltering items.

If you are writing an implementation and are not sure which value to pass, Different is always a correct choice.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Different

The filter change cannot be described with any of the other enumeration values.

LessStrict

The filter is less strict than it was before: All items that it used to return true for still return true, others now may, too.

MoreStrict

The filter is more strict than it was before: All items that it used to return false for still return false, others now may, too.

Trait Implementations

impl Clone for FilterChange

fn clone(&self) -> FilterChange

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for FilterChange

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

Formats the value using the given formatter.

impl From<FilterChange> for Value

fn from(v: FilterChange) -> Self

Converts to this type from the input type.

impl<'a> FromValue<'a> for FilterChange

type Checker = GenericValueTypeChecker<FilterChange>

Value type checker.

unsafe fn from_value(value: &'a Value) -> Self

Get the contained value from a Value.

impl HasParamSpec for FilterChange

type ParamSpec = ParamSpecEnum

type SetValue = FilterChange

Preferred value to be used as setter for the associated ParamSpec.

type BuilderFn = fn(_: &str, _: FilterChange) -> ParamSpecEnumBuilder<'_, FilterChange>

fn param_spec_builder() -> Self::BuilderFn

impl Hash for FilterChange

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 Ord for FilterChange

fn cmp(&self, other: &FilterChange) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for FilterChange

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for FilterChange

fn partial_cmp(&self, other: &FilterChange) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl StaticType for FilterChange

fn static_type() -> Type

Returns the type identifier of Self.

impl ToValue for FilterChange

fn to_value(&self) -> Value

Convert a value to a Value.

fn value_type(&self) -> Type

Returns the type identifier of self.

impl ValueType for FilterChange

type Type = FilterChange

Type to get the Type from.

impl Copy for FilterChange

impl Eq for FilterChange

impl StructuralPartialEq for FilterChange