Struct ThemeExtensions 

pub struct ThemeExtensions { /* private fields */ }

A persistent, typed extension map: any 'static + Send + Sync type can be attached once (a later insert of the same type replaces it) and recovered by type via get.

Send + Sync bounds match crate::theme::Theme’s own crossing of frust-shell-common’s process-global Mutex<OverrideSlot> (see that module’s thread contract) — an extension type that isn’t Send + Sync simply can’t be inserted, a compile-time guarantee rather than a runtime one.

Implementations

impl ThemeExtensions

pub fn new() -> Self

An empty extension map.

pub fn insert<T: Any + Send + Sync>(&mut self, ext: T)

Attach ext, keyed by its concrete type T. A later insert::<T> call replaces whatever T was previously attached (last write wins, mirroring HashMap::insert).

pub fn get<T: Any + Send + Sync>(&self) -> Option<&T>

Recover the attached T, or None if nothing of that type was ever inserted — never a panic on a type that isn’t there.

pub fn is_empty(&self) -> bool

Whether any extension is attached at all — mostly useful for tests.

pub fn len(&self) -> usize

How many distinct extension types are attached.

Trait Implementations

impl Clone for ThemeExtensions

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ThemeExtensions

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

Formats the value using the given formatter.

impl Default for ThemeExtensions

fn default() -> Self

Returns the “default value” for a type.

impl PartialEq for ThemeExtensions

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

Equality operator ==.

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

Inequality operator !=.