#[macro_use]
extern crate yew;
#[macro_use]
extern crate stdweb;
use yew::prelude::*;
use stdweb::web::document;
use stdweb::web::INonElementParentNode;
use yew::services::console::ConsoleService;
use stdweb::Value;
use stdweb::unstable::TryInto;
#[derive(Clone)]
pub enum Slide {
Text(String),
Image(&'static str, String)
}
pub struct Story {
pub slides: Vec<Slide>,
}
struct Registry {
console: ConsoleService,
story: Option<Story>,
}
struct RootModel {
story: Story,
current_slide: usize,
#[allow(dead_code)]
handle: Value,
}
enum RootMessage {
Keydown(u8),
}
impl Component<Registry> for RootModel {
type Message = RootMessage;
type Properties = ();
fn create(_props: <Self as Component<Registry>>::Properties, context: &mut Env<Registry, Self>) -> Self {
let callback = context.send_back(|code: u8| RootMessage::Keydown(code));
let js_callback = move |v: Value| { callback.emit(v.try_into().unwrap()) };
let handle = js! {
var cb = @{js_callback};
return document.addEventListener("keypress", function (e) {
console.log(e.keyCode);
cb(e.keyCode);
})
};
let story = context.story.take().unwrap_or_else(|| Story { slides: vec!() });
RootModel {
story,
current_slide: 0,
handle,
}
}
fn update(&mut self, msg: <Self as Component<Registry>>::Message, context: &mut Env<Registry, Self>) -> bool {
let slides_count = self.story.slides.len();
match msg {
RootMessage::Keydown(46) => {
self.current_slide = (slides_count + self.current_slide + 1).min(slides_count + slides_count - 1) % slides_count;
true
}
RootMessage::Keydown(44) => {
self.current_slide = (slides_count + self.current_slide - 1).max(slides_count) % slides_count;
true
}
RootMessage::Keydown(code) => {
context.console.log(&format!("Unhandled key {}", code));
false
}
}
}
}
impl Renderable<Registry, RootModel> for RootModel {
fn view(&self) -> Html<Registry, RootModel> {
let current_slide = &self.story.slides[self.current_slide];
match (self.story.slides.len(), current_slide) {
(0, _) => {
html! {
<div class="slide-wrapper",>
<div class="slide",>
{ "Nothing to display" }
</div>
</div>
}
}
(_, Slide::Text(string)) => {
html! {
<div class="slide-wrapper",>
<div class="slide",>
{ string }
</div>
</div>
}
}
(_, Slide::Image(resource, string)) => {
html! {
<div class="slide-wrapper",>
<div class="slide",>
<img src=resource, />
{ string }
</div>
</div>
}
}
}
}
}
pub fn run(story: Story) {
yew::initialize();
let registry = Registry {
console: ConsoleService::new(),
story: Some(story),
};
let app = App::<Registry, RootModel>::new(registry);
app.mount(document().get_element_by_id("app").expect("div with id app not found"));
yew::run_loop();
}