xous-core/apps/hello/src/main.rs

#![cfg_attr(target_os = "none", no_std)]
#![cfg_attr(target_os = "none", no_main)]

use core::fmt::Write;

use graphics_server::api::GlyphStyle;
use graphics_server::{DrawStyle, Gid, PixelColor, Point, Rectangle, TextBounds, TextView};
use locales::t;
use num_traits::*;
#[cfg(feature = "tts")]
use tts_frontend::*;

/// Basic 'Hello World!' application that draws a simple
/// TextView to the screen.

pub(crate) const SERVER_NAME_HELLO: &str = "_Hello World_";

/// Top level application events.
#[derive(Debug, num_derive::FromPrimitive, num_derive::ToPrimitive)]
pub(crate) enum HelloOp {
    /// Redraw the screen
    Redraw = 0,

    /// Quit the application
    Quit,
}

struct Hello {
    content: Gid,
    gam: gam::Gam,
    _gam_token: [u32; 4],
    screensize: Point,
    #[cfg(feature = "tts")]
    tts: TtsFrontend,
}

impl Hello {
    fn new(xns: &xous_names::XousNames, sid: xous::SID) -> Self {
        let gam = gam::Gam::new(&xns).expect("Can't connect to GAM");
        let gam_token = gam
            .register_ux(gam::UxRegistration {
                app_name: String::from(gam::APP_NAME_HELLO),
                ux_type: gam::UxType::Chat,
                predictor: None,
                listener: sid.to_array(),
                redraw_id: HelloOp::Redraw.to_u32().unwrap(),
                gotinput_id: None,
                audioframe_id: None,
                rawkeys_id: None,
                focuschange_id: None,
            })
            .expect("Could not register GAM UX")
            .unwrap();

        let content = gam.request_content_canvas(gam_token).expect("Could not get content canvas");
        let screensize = gam.get_canvas_bounds(content).expect("Could not get canvas dimensions");
        Self {
            gam,
            _gam_token: gam_token,
            content,
            screensize,
            #[cfg(feature = "tts")]
            tts: TtsFrontend::new(xns).unwrap(),
        }
    }

    /// Clear the entire screen.
    fn clear_area(&self) {
        self.gam
            .draw_rectangle(
                self.content,
                Rectangle::new_with_style(
                    Point::new(0, 0),
                    self.screensize,
                    DrawStyle { fill_color: Some(PixelColor::Light), stroke_color: None, stroke_width: 0 },
                ),
            )
            .expect("can't clear content area");
    }

    /// Redraw the text view onto the screen.
    fn redraw(&mut self) {
        self.clear_area();

        let mut text_view = TextView::new(
            self.content,
            TextBounds::GrowableFromBr(
                Point::new(
                    self.screensize.x - (self.screensize.x / 2),
                    self.screensize.y - (self.screensize.y / 2),
                ),
                (self.screensize.x / 5 * 4) as u16,
            ),
        );

        text_view.border_width = 1;
        text_view.draw_border = true;
        text_view.clear_area = true;
        text_view.rounded_border = Some(3);
        text_view.style = GlyphStyle::Regular;
        write!(text_view.text, "{}", t!("helloworld.hello", locales::LANG))
            .expect("Could not write to text view");
        #[cfg(feature = "tts")]
        self.tts.tts_simple(t!("helloworld.hello", locales::LANG)).unwrap();

        self.gam.post_textview(&mut text_view).expect("Could not render text view");
        self.gam.redraw().expect("Could not redraw screen");
    }
}

fn main() -> ! {
    log_server::init_wait().unwrap();
    log::set_max_level(log::LevelFilter::Info);
    log::info!("Hello world PID is {}", xous::process::id());

    let xns = xous_names::XousNames::new().unwrap();

    // Register the server with xous
    let sid = xns.register_name(SERVER_NAME_HELLO, None).expect("can't register server");

    let mut hello = Hello::new(&xns, sid);

    loop {
        let msg = xous::receive_message(sid).unwrap();
        log::debug!("Got message: {:?}", msg);

        match FromPrimitive::from_usize(msg.body.id()) {
            Some(HelloOp::Redraw) => {
                log::debug!("Got redraw");
                hello.redraw();
            }
            Some(HelloOp::Quit) => {
                log::info!("Quitting application");
                break;
            }
            _ => {
                log::error!("Got unknown message");
            }
        }
    }

    log::info!("Quitting");
    xous::terminate_process(0)
}