use gtk::prelude::*;
use relm4::prelude::*;
struct App {
counter: u8,
}
#[derive(Debug)]
enum Msg {
Increment,
Decrement,
}
#[relm4::component]
impl SimpleComponent for App {
type Init = u8;
type Input = Msg;
type Output = ();
view! {
gtk::Window {
set_title: Some("Simple app"),
set_default_size: (300, 100),
gtk::Box {
set_orientation: gtk::Orientation::Vertical,
set_spacing: 5,
set_margin_all: 5,
gtk::Button {
set_label: "Increment",
connect_clicked => Msg::Increment,
},
gtk::Button {
set_label: "Decrement",
connect_clicked => Msg::Decrement,
},
gtk::Label {
#[watch]
set_label: &format!("Counter: {}", model.counter),
set_margin_all: 5,
}
}
}
}
fn init(
counter: Self::Init,
root: Self::Root,
sender: ComponentSender<Self>,
) -> ComponentParts<Self> {
let model = App { counter };
let widgets = view_output!();
ComponentParts { model, widgets }
}
fn update(&mut self, msg: Self::Input, _sender: ComponentSender<Self>) {
match msg {
Msg::Increment => {
self.counter = self.counter.wrapping_add(1);
}
Msg::Decrement => {
self.counter = self.counter.wrapping_sub(1);
}
}
}
}
fn main() {
let app = RelmApp::new("relm4.example.simple");
app.run::<App>(0);
}