78 lines
1.8 KiB
Rust
78 lines
1.8 KiB
Rust
use crate::widget::state;
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use crate::widget::{Id, Operation};
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use iced_futures::MaybeSend;
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pub struct Action<T>(Box<dyn Operation<T>>);
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impl<T> Action<T> {
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pub fn new(operation: impl Operation<T> + 'static) -> Self {
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Self(Box::new(operation))
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}
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pub fn map<A>(
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self,
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f: impl Fn(T) -> A + 'static + MaybeSend + Sync,
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) -> Action<A>
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where
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T: 'static,
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A: 'static,
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{
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Action(Box::new(Map {
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operation: self.0,
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f: Box::new(f),
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}))
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}
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pub fn into_operation(self) -> Box<dyn Operation<T>> {
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self.0
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}
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}
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struct Map<A, B> {
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operation: Box<dyn Operation<A>>,
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f: Box<dyn Fn(A) -> B>,
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}
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impl<A, B> Operation<B> for Map<A, B>
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where
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A: 'static,
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B: 'static,
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{
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fn container(
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&mut self,
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id: Option<&Id>,
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operate_on_children: &dyn Fn(&mut dyn Operation<B>),
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) {
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struct MapRef<'a, A, B> {
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operation: &'a mut dyn Operation<A>,
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f: &'a dyn Fn(A) -> B,
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}
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impl<'a, A, B> Operation<B> for MapRef<'a, A, B> {
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fn container(
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&mut self,
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id: Option<&Id>,
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operate_on_children: &dyn Fn(&mut dyn Operation<B>),
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) {
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let Self { operation, f } = self;
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operation.container(id, &|operation| {
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operate_on_children(&mut MapRef { operation, f });
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});
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}
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}
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let Self { operation, f } = self;
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MapRef {
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operation: operation.as_mut(),
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f,
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}
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.container(id, operate_on_children);
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}
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fn focusable(&mut self, state: &mut dyn state::Focusable, id: Option<&Id>) {
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self.operation.focusable(state, id);
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}
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}
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