How to use this inside a struct for my egui app.

Hello, I'm trying to use this crate to make my egui app's page navigation.

I have this in my app:

#[typestate]
mod page_navigator {
    #[automaton]
    pub struct Page {}

    #[state]
    pub struct FirstPage;
    #[state]
    pub struct SecondPage;

    pub trait FirstPage {
        fn init() -> FirstPage;
        fn next_page(self) -> SecondPage;
    }

    pub trait SecondPage {
        fn prev_page(self) -> FirstPage;
        fn close(self);
    }
}

impl FirstPageState for Page<FirstPage> {
    fn init() -> Page<FirstPage> {
        Self { state: FirstPage }
    }

    fn next_page(self) -> Page<SecondPage> {
        Page::<SecondPage> { state: SecondPage }
    }
}

impl SecondPageState for Page<SecondPage> {
    fn prev_page(self) -> Page<FirstPage> {
        Page::<FirstPage> { state: FirstPage }
    }

    fn close(self) {
    }
}

I want to put this inside my egui app's App struct:

#[tokio::main]
async fn main() -> eframe::Result {
    eframe::run_native(
        "page_test_app",
        eframe::NativeOptions::default(),
        Box::new(|_cc| Ok(Box::new(App::init()))),
    )
}

struct App {
    current_app_page: Page<FirstPage>,
}

impl App {
    pub fn init() -> Self {
        Self {
            current_app_page: Page::init(),
        }
    }
}

and so far it compiles fine. But obviously when I want to change the page I need to reassign the current_app_page field to the new transitioned state problems arise because of the field's type:

impl eframe::App for App {
    fn update(&mut self, ctx: &eframe::egui::Context, frame: &mut eframe::Frame) {
        eframe::egui::CentralPanel::default().show(ctx, |ui| {
            if ui.button("Next Page").clicked() {
                self.current_app_page = self.current_app_page.next_page();
            }
        });
    }
}

How do I go about this?

Should I make my whole App struct generic over my PageState?

I apologize for the quality of this issue but I really don't know what would be a good way to do this.

rustype / typestate-rs

How to use this inside a struct for my egui app. #47