48 lines
1,013 B
Rust
48 lines
1,013 B
Rust
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use crate::{Color, Widget};
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pub struct Element<'a, Message> {
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pub(crate) widget: Box<dyn Widget<Message> + 'a>,
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}
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impl<'a, Message> Element<'a, Message> {
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pub fn new(widget: impl Widget<Message> + 'a) -> Self {
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Self {
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widget: Box::new(widget),
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}
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}
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pub fn explain(self, color: Color) -> Element<'a, Message> {
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self
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}
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pub fn map<F, B>(self, f: F) -> Element<'a, B>
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where
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Message: 'static,
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B: 'static,
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F: 'static + Fn(Message) -> B,
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{
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Element {
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widget: Box::new(Map::new(self.widget, f)),
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}
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}
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}
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struct Map<'a, A, B> {
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widget: Box<dyn Widget<A> + 'a>,
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mapper: Box<dyn Fn(A) -> B>,
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}
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impl<'a, A, B> Map<'a, A, B> {
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pub fn new<F>(widget: Box<dyn Widget<A> + 'a>, mapper: F) -> Map<'a, A, B>
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where
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F: 'static + Fn(A) -> B,
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{
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Map {
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widget,
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mapper: Box::new(mapper),
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}
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}
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}
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impl<'a, A, B> Widget<B> for Map<'a, A, B> {}
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