Struct scl_gui_widgets::widgets::Store

pub struct Store<F, T> { /* private fields */ }

一个中间件组件，用于拦截数据流并进行处理

和 [druid::Lens] 不一样的地方是，它不强制你去设置数据，这允许你在无法转换数据的情况下保持子代数据不变或父代数据不变。

Implementations

impl<F: Data, T: Data> Store<F, T>

pub fn new( inner: impl Widget<T> + 'static, pre_data_processor: fn(_: &F, _: &mut T), post_data_processor: fn(_: &T, _: &mut F), initial_post_data: T ) -> Self

创建一个中间件组件，需要提供将被传递数据的组件和相互转换的回调函数，并提供一个默认的转换后的值

impl<F: Data, T: Data + Default> Store<F, T>

pub fn new_default( inner: impl Widget<T> + 'static, pre_data_processor: fn(_: &F, _: &mut T), post_data_processor: fn(_: &T, _: &mut F) ) -> Self

创建一个中间件组件，需要提供将被传递数据的组件和相互转换的回调函数，默认值会使用其转换后类型的 Default::default 默认值

Trait Implementations

impl<F: Data, T: Data> Widget<F> for Store<F, T>

fn event( &mut self, ctx: &mut EventCtx<'_, '_>, event: &Event, data: &mut F, env: &Env )

Handle an event.

fn lifecycle( &mut self, ctx: &mut LifeCycleCtx<'_, '_>, event: &LifeCycle, _data: &F, env: &Env )

Handle a life cycle notification.

fn update( &mut self, ctx: &mut UpdateCtx<'_, '_>, _old_data: &F, data: &F, env: &Env )

Update the widget’s appearance in response to a change in the app’s [Data] or [Env].

fn layout( &mut self, ctx: &mut LayoutCtx<'_, '_>, bc: &BoxConstraints, _data: &F, env: &Env ) -> Size

Compute layout.

fn paint(&mut self, ctx: &mut PaintCtx<'_, '_, '_>, _data: &F, env: &Env)

Paint the widget appearance.

fn compute_max_intrinsic( &mut self, axis: Axis, ctx: &mut LayoutCtx<'_, '_>, bc: &BoxConstraints, data: &T, env: &Env ) -> f64

Computes max intrinsic/preferred dimension of a widget on the provided axis.