Struct WidgetStates 

pub struct WidgetStates(/* private fields */);

The set of states a widget is in, as a byte rather than a hash set.

The reference passes a Set<WidgetState>. Eight states fit in eight bits, and a Copy set with no allocation is what a paint walk that runs every frame wants — it also means the set can take part in the rebuild hash, which a HashSet could not do cheaply.

Implementations

impl WidgetStates

pub const EMPTY: Self

In no state at all: at rest, reachable, valid, unselected.

pub const fn of(state: WidgetState) -> Self

The set holding state alone.

pub const fn with(self, state: WidgetState) -> Self

This set, plus state.

pub const fn without(self, state: WidgetState) -> Self

This set, less state.

pub const fn set(self, state: WidgetState, on: bool) -> Self

This set, with state present or not according to on — the shape a widget answering for its own selection wants.

pub const fn contains(self, state: WidgetState) -> bool

Is the widget in this state?

pub const fn is_empty(self) -> bool

Is it in none at all?

Trait Implementations

impl BitOr<WidgetState> for WidgetStates

type Output = WidgetStates

The resulting type after applying the | operator.

fn bitor(self, state: WidgetState) -> WidgetStates

Performs the | operation.

impl Clone for WidgetStates

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 WidgetStates

impl Debug for WidgetStates

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

Formats the value using the given formatter.

impl Default for WidgetStates

fn default() -> Self

Returns the “default value” for a type.

impl Eq for WidgetStates

impl From<WidgetState> for WidgetStates

fn from(state: WidgetState) -> Self

Converts to this type from the input type.

impl Hash for WidgetStates

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 PartialEq for WidgetStates

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for WidgetStates