Trait UseContext 

pub trait UseContext<'a>: Sealed {
    // Required methods
    fn use_context<T: Any>(&self) -> Ref<'a, T>;
    fn use_context_mut<T: Any>(&self) -> RefMut<'a, T>;
    fn try_use_context<T: Any>(&self) -> Option<Ref<'a, T>>;
    fn try_use_context_mut<T: Any>(&self) -> Option<RefMut<'a, T>>;
}

Required Methods

fn use_context<T: Any>(&self) -> Ref<'a, T>

获取全局/局部上下文，实现依赖注入。适合主题、配置、全局状态等场景。

fn use_context_mut<T: Any>(&self) -> RefMut<'a, T>

获取可变上下文。

fn try_use_context<T: Any>(&self) -> Option<Ref<'a, T>>

尝试获取只读上下文，返回 Option。

fn try_use_context_mut<T: Any>(&self) -> Option<RefMut<'a, T>>

尝试获取可变上下文，返回 Option。

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.

Implementors

impl<'a> UseContext<'a> for Hooks<'a, '_>