Relm4

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• Official Website for GTK-Rust

use adw::prelude::*;
use relm4::prelude::*;

struct AppModel {
    counter: u8,
}

#[derive(Debug)]
enum AppMsg {
    Increment,
    Decrement,
}

#[relm4::component]
impl SimpleComponent for AppModel {
    /// The type of data with which this component will be initialized.
    type Init = u8;
    /// The type of the messages that this component can receive.
    type Input = AppMsg;
    /// The type of the messages that this component can send.
    type Output = ();

    view! {
        gtk::Window {
            set_title: Some("Simple app"),
            set_default_width: 300,
            set_default_height: 100,

            gtk::Box {
                set_orientation: gtk::Orientation::Vertical,
                set_spacing: 5,
                set_margin_all: 5,

                gtk::Button {
                    set_label: "Increment",
                    connect_clicked => AppMsg::Increment
                },

                gtk::Button::with_label("Decrement") {
                    connect_clicked => AppMsg::Decrement
                },

                gtk::Label {
                    #[watch]
                    set_label: &format!("Counter: {}", model.counter),
                    set_margin_all: 5,
                }
            }
        }
    }

    // Initialize the UI.
    fn init(
        counter: Self::Init,
        root: Self::Root,
        sender: ComponentSender<Self>,
    ) -> ComponentParts<Self> {
        let model = AppModel { counter };

        // Insert the macro code generation here
        let widgets = view_output!();

        ComponentParts { model, widgets }
    }

    fn update(&mut self, msg: Self::Input, _sender: ComponentSender<Self>) {
        match msg {
            AppMsg::Increment => {
                self.counter = self.counter.wrapping_add(1);
            }
            AppMsg::Decrement => {
                self.counter = self.counter.wrapping_sub(1);
            }
        }
    }
}

fn main() {
    let app = RelmApp::new("app.relm4.counter_demo");
    app.run::<AppModel>(0);
}