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main.rs
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main.rs
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use iced::widget::{button, column, text};
use iced::{Element, Sandbox, Settings};
use wasmer::{imports, Instance, Module, Store, Value};
struct Counter {
value: i32,
instance: Instance,
store: Store,
}
#[derive(Debug, Clone, Copy)]
enum Message {
Increment,
Decrememt,
}
impl Sandbox for Counter {
type Message = Message;
fn new() -> Self {
let module_wat = r#"
(module
(func $add
(export "add")
(param i32)
(param i32)
(result i32)
(i32.add
get_local 0
get_local 1)))
"#;
let mut store = Store::default();
let module = Module::new(&store, &module_wat).expect("load module failed");
let import_object = imports! {};
let instance =
Instance::new(&mut store, &module, &import_object).expect("instantiate module failed");
Self {
value: 0,
instance,
store,
}
}
fn title(&self) -> String {
"waui".to_owned()
}
fn update(&mut self, message: Self::Message) {
let add = self
.instance
.exports
.get_function("add")
.expect("get add fn failed");
let amount = match message {
Message::Increment => 1,
Message::Decrememt => -1,
};
self.value = add
.call(
&mut self.store,
&[Value::I32(self.value), Value::I32(amount)],
)
.expect("call add fn failed")[0]
.unwrap_i32();
}
fn view(&self) -> Element<Self::Message> {
column![
button("+").on_press(Message::Increment),
text(self.value),
button("-").on_press(Message::Decrememt)
]
.into()
}
}
fn main() -> iced::Result {
Counter::run(Settings::default())
}