tui-bars 0.1.0

Bar widgets for tui-rs
Documentation 
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use std::{
    error::Error,
    f32::consts::PI,
    io,
    time::{Duration, Instant},
};

use crossterm::{
    event::{self, Event, KeyCode},
    execute,
    terminal::{disable_raw_mode, enable_raw_mode, EnterAlternateScreen, LeaveAlternateScreen},
};
use tui::{
    backend::{Backend, CrosstermBackend},
    layout::{Constraint, Direction, Layout},
    style::{Color, Style},
    widgets::{Block, Borders},
    Frame, Terminal,
};
use tui_bars::ValueBar;

#[derive(Default)]
struct App([f32; 4]);

impl App {
    fn on_tick(&mut self, t: f32) {
        self.0 = [
            (2. * PI * (t + 0.0) / 5.).sin(),
            (2. * PI * (t + 0.25) / 5.).sin(),
            (2. * PI * (t + 0.5) / 5.).sin(),
            (2. * PI * (t + 0.75) / 5.).sin(),
        ];
    }
}

fn main() -> Result<(), Box<dyn Error>> {
    // setup terminal
    enable_raw_mode()?;
    let mut stdout = io::stdout();
    execute!(stdout, EnterAlternateScreen)?;
    let backend = CrosstermBackend::new(stdout);
    let mut terminal = Terminal::new(backend)?;

    // create app and run it
    let tick_rate = Duration::from_millis(50);
    let app = App::default();
    let res = run_app(&mut terminal, app, tick_rate);

    // restore terminal
    disable_raw_mode()?;
    execute!(terminal.backend_mut(), LeaveAlternateScreen,)?;
    terminal.show_cursor()?;

    if let Err(err) = res {
        println!("{:?}", err)
    }

    Ok(())
}

fn run_app<B: Backend>(
    terminal: &mut Terminal<B>,
    mut app: App,
    tick_rate: Duration,
) -> io::Result<()> {
    let mut last_tick = Instant::now();
    let mut t = 0.;
    loop {
        terminal.draw(|f| ui(f, &app))?;

        let timeout = tick_rate
            .checked_sub(last_tick.elapsed())
            .unwrap_or_else(|| Duration::from_secs(0));
        if crossterm::event::poll(timeout)? {
            if let Event::Key(key) = event::read()? {
                if let KeyCode::Char('q') = key.code {
                    return Ok(());
                }
            }
        }
        if last_tick.elapsed() >= tick_rate {
            t += tick_rate.as_secs_f32();
            app.on_tick(t);
            last_tick = Instant::now();
        }
    }
}

fn ui<B: Backend>(f: &mut Frame<B>, app: &App) {
    let layout = Layout::default()
        .direction(Direction::Horizontal)
        .constraints([Constraint::Percentage(50), Constraint::Percentage(50)].as_ref())
        .split(f.size());

    let horizontals = Layout::default()
        .direction(Direction::Vertical)
        .constraints(
            [
                Constraint::Percentage(25),
                Constraint::Percentage(25),
                Constraint::Percentage(25),
                Constraint::Percentage(25),
            ]
            .as_ref(),
        )
        .split(layout[0]);
    let verticals = Layout::default()
        .direction(Direction::Horizontal)
        .constraints(
            [
                Constraint::Percentage(25),
                Constraint::Percentage(25),
                Constraint::Percentage(25),
                Constraint::Percentage(25),
            ]
            .as_ref(),
        )
        .split(layout[1]);

    for (i, color) in [
        Color::DarkGray,
        Color::Black,
        Color::LightBlue,
        Color::White,
    ]
    .into_iter()
    .enumerate()
    {
        let x = app.0[i];
        let bar = ValueBar::default()
            .value(x)
            .range(1.)
            .direction(Direction::Horizontal)
            .label(format!("{x:.2}"))
            .block(Block::default().title("SinWave").borders(Borders::ALL))
            .style(Style::default().fg(color));
        f.render_widget(bar.clone(), horizontals[i]);
        f.render_widget(bar.direction(Direction::Vertical), verticals[i]);
    }
}