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use crate::callback::Callback;
use crate::html::{ChangeData, Component, ComponentLink, Html, NodeRef, ShouldRender};
use crate::macros::{html, Properties};
use cfg_if::cfg_if;
use cfg_match::cfg_match;
cfg_if! {
if #[cfg(feature = "std_web")] {
use stdweb::web::html_element::SelectElement;
} else if #[cfg(feature = "web_sys")] {
use web_sys::HtmlSelectElement as SelectElement;
}
}
#[derive(Debug)]
pub struct Select<T: ToString + PartialEq + Clone + 'static> {
props: Props<T>,
select_ref: NodeRef,
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,
select_ref: NodeRef::default(),
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 {
if self.props.selected != props.selected {
if let Some(select) = self.select_ref.cast::<SelectElement>() {
let val = props
.selected
.as_ref()
.map(|v| v.to_string())
.unwrap_or_default();
cfg_match! {
feature = "std_web" => select.set_raw_value(&val),
feature = "web_sys" => select.set_value(&val),
}
}
}
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 value=value.to_string() selected=flag>{ value.to_string() }</option>
}
};
html! {
<select ref=self.select_ref.clone() disabled=self.props.disabled onchange=self.onchange()>
<option value="" 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!();
}
})
}
}