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use crate::callback::Callback;
use crate::html::{ChangeData, Component, ComponentLink, Html, ShouldRender};
use crate::macros::{html, Properties};
use cfg_match::cfg_match;
#[derive(Debug)]
pub struct Select<T: ToString + PartialEq + Clone + 'static> {
props: Props<T>,
link: ComponentLink<Self>,
}
#[derive(Debug)]
pub enum Msg {
Selected(Option<usize>),
}
#[derive(PartialEq, Clone, Properties, Debug)]
pub struct Props<T: Clone> {
#[prop_or_default]
pub selected: Option<T>,
#[prop_or_default]
pub disabled: bool,
#[prop_or_default]
pub options: Vec<T>,
pub onchange: Callback<T>,
}
impl<T> Component for Select<T>
where
T: ToString + PartialEq + Clone + 'static,
{
type Message = Msg;
type Properties = Props<T>;
fn create(props: Self::Properties, link: ComponentLink<Self>) -> Self {
Self { props, link }
}
fn update(&mut self, msg: Self::Message) -> ShouldRender {
match msg {
Msg::Selected(value) => {
if let Some(idx) = value {
let item = self.props.options.get(idx - 1).cloned();
if let Some(value) = item {
self.props.onchange.emit(value);
}
}
}
}
true
}
fn change(&mut self, props: Self::Properties) -> ShouldRender {
self.props = props;
true
}
fn view(&self) -> Html {
let selected = self.props.selected.as_ref();
let view_option = |value: &T| {
let flag = selected == Some(value);
html! {
<option selected=flag>{ value.to_string() }</option>
}
};
html! {
<select disabled=self.props.disabled onchange=self.onchange()>
<option disabled=true selected=selected.is_none()>
{ "↪" }
</option>
{ for self.props.options.iter().map(view_option) }
</select>
}
}
}
impl<T> Select<T>
where
T: ToString + PartialEq + Clone + 'static,
{
fn onchange(&self) -> Callback<ChangeData> {
self.link.callback(|event| match event {
ChangeData::Select(elem) => {
let value = elem.selected_index();
let value = cfg_match! {
feature = "std_web" => value.map(|x| x as usize),
feature = "web_sys" => Some(value as usize),
};
Msg::Selected(value)
}
_ => {
unreachable!();
}
})
}
}