pub struct OnChange<T>(_);
Expand description

一个控制器,当数据流发生更新时触发回调

推荐使用 crate::widget_ext::WidgetExt::on_change 来创建本控制器于一个组件上

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impl<T> OnChange<T>

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pub fn new( f: impl Fn(&mut EventCtx<'_, '_>, &T, &mut T, &Env) + 'static ) -> Self

根据所给回调创建此控制器

推荐使用 crate::widget_ext::WidgetExt::on_change 来创建本控制器于一个组件上

Trait Implementations§

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impl<T: Data, W: Widget<T>> Controller<T, W> for OnChange<T>

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fn event( &mut self, child: &mut W, ctx: &mut EventCtx<'_, '_>, event: &Event, data: &mut T, env: &Env )

Analogous to [Widget::event].
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fn lifecycle( &mut self, child: &mut W, ctx: &mut LifeCycleCtx<'_, '_>, event: &LifeCycle, data: &T, env: &Env )

Analogous to [Widget::lifecycle].
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fn update( &mut self, child: &mut W, ctx: &mut UpdateCtx<'_, '_>, old_data: &T, data: &T, env: &Env )

Analogous to [Widget::update].

Auto Trait Implementations§

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impl<T> !RefUnwindSafe for OnChange<T>

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impl<T> !Send for OnChange<T>

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impl<T> !Sync for OnChange<T>

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impl<T> Unpin for OnChange<T>

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impl<T> !UnwindSafe for OnChange<T>

Blanket Implementations§

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impl<T> Any for Twhere T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for Twhere T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for Twhere T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided [Span], returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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impl<T, U> Into<U> for Twhere U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> RoundFrom<T> for T

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fn round_from(x: T) -> T

Performs the conversion.
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impl<T, U> RoundInto<U> for Twhere U: RoundFrom<T>,

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fn round_into(self) -> U

Performs the conversion.
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impl<T> Same<T> for T

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type Output = T

Should always be Self
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impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a [WithDispatch] wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a [WithDispatch] wrapper. Read more