dioxus/docs/guide/examples/component_props_options.rs

#![allow(non_snake_case)]
use dioxus::prelude::*;

fn main() {
    dioxus::desktop::launch(App);
}

fn App(cx: Scope) -> Element {
    cx.render(rsx! {
        // ANCHOR: OptionalProps_usage
        Title {
            title: "Some Title",
        },
        Title {
            title: "Some Title",
            subtitle: "Some Subtitle",
        },
        // Providing an Option explicitly won't compile though:
        // Title {
        //     title: "Some Title",
        //     subtitle: None,
        // },
        // ANCHOR_END: OptionalProps_usage

        // ANCHOR: ExplicitOption_usage
        ExplicitOption {
            title: "Some Title",
            subtitle: None,
        },
        ExplicitOption {
            title: "Some Title",
            subtitle: Some("Some Title"),
        },
        // This won't compile:
        // ExplicitOption {
        //     title: "Some Title",
        // },
        // ANCHOR_END: ExplicitOption_usage

        // ANCHOR: DefaultComponent_usage
        DefaultComponent {
            number: 5,
        },
        DefaultComponent {},
        // ANCHOR_END: DefaultComponent_usage

        // ANCHOR: IntoComponent_usage
        IntoComponent {
            string: "some &str",
        },
        // ANCHOR_END: IntoComponent_usage
    })
}

// ANCHOR: OptionalProps
#[derive(Props)]
struct OptionalProps<'a> {
    title: &'a str,
    subtitle: Option<&'a str>,
}

fn Title<'a>(cx: Scope<'a, OptionalProps>) -> Element<'a> {
    return cx.render(rsx!(h1{
        "{cx.props.title}: ",
        [cx.props.subtitle.unwrap_or("No subtitle provided")],
    }));
}
// ANCHOR_END: OptionalProps

// ANCHOR: ExplicitOption
#[derive(Props)]
struct ExplicitOptionProps<'a> {
    title: &'a str,
    #[props(!optional)]
    subtitle: Option<&'a str>,
}

fn ExplicitOption<'a>(cx: Scope<'a, ExplicitOptionProps>) -> Element<'a> {
    return cx.render(rsx!(h1{
        "{cx.props.title}: ",
        [cx.props.subtitle.unwrap_or("No subtitle provided")],
    }));
}
// ANCHOR_END: ExplicitOption

// ANCHOR: DefaultComponent
#[derive(PartialEq, Props)]
struct DefaultProps {
    // default to 42 when not provided
    #[props(default = 42)]
    number: i64,
}

fn DefaultComponent(cx: Scope<DefaultProps>) -> Element {
    return cx.render(rsx!(h1{
        "{cx.props.number}",
    }));
}
// ANCHOR_END: DefaultComponent

// ANCHOR: IntoComponent
#[derive(PartialEq, Props)]
struct IntoProps {
    #[props(into)]
    string: String,
}

fn IntoComponent(cx: Scope<IntoProps>) -> Element {
    return cx.render(rsx!(h1{
        "{cx.props.string}",
    }));
}
// ANCHOR_END: IntoComponent