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Jakub Stachurski 2025-08-14 23:36:57 +02:00
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15
Cargo.toml Normal file
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[package]
name = "ratatui-demo"
version = "0.1.0"
edition = "2024"
[dependencies]
cassowary = "0.3.0"
crossterm = { version = "0.29.0", features = ["event-stream"] }
futures = "0.3.31"
ratatui = "0.29.0"
terminput = "0.5.3"
terminput-crossterm = "0.3.3"
termion = "4.0.5"
termios = "0.3.3"
tokio = { version = "1.47.1", features = ["full"] }

103
src/app.rs Normal file
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use std::f64::consts::PI;
use ratatui::{layout::Rect, style::{Style, Stylize}, text::{Line, Span}, widgets::{Block, Paragraph}};
use terminput::KeyCode;
use crate::Demo;
pub(crate) struct MyApp {
counter: usize,
frame_counter: usize,
}
impl Demo for MyApp {
fn new() -> Self {
Self {
counter: 0,
frame_counter: 0,
}
}
async fn frame(&mut self, term: &mut crate::Term) -> Result<(), String> {
term.draw(|fr| {
self.frame_counter = self.frame_counter.wrapping_add(1);
let style = Style::new().light_yellow().on_black();
let block = Block::bordered()
.style(style)
.title("Example demo")
.title_bottom("Sine - made by: wilkuu (Jakub Stachurski), jakub@snt.utwente.nl");
let area = fr.area();
let barea = block.inner(area);
fr.render_widget(block, area);
let xl = barea.x;
let xr = barea.width + barea.x;
let yt = barea.y + barea.height;
let w1 = PI * 2.0 / 100.0;
let w2 = PI * 2.0 / 300.0;
let buf = fr.buffer_mut();
for x in xl..xr {
let p1 = self.frame_counter as f64 / 100.0;
let p2 = self.frame_counter as f64 / 50.0;
let y1: u16 = ((
((w1 * Into::<f64>::into(x)) + p1 as f64).sin() + 1.0)
* Into::<f64>::into(barea.height / 2-1) + Into::<f64>::into(barea.y)).round() as u16;
let y2: u16 = ((
((w2 * Into::<f64>::into(x)) + p2 as f64).sin() + 1.0)
* Into::<f64>::into(barea.height / 2-1) + Into::<f64>::into(barea.y)).round() as u16;
if y2 == y1 {
buf.set_span(x, (y1.saturating_sub(1)).max(barea.y), &Span::from("_").light_magenta(), 1);
buf.set_span(x, y1, &Span::from("#").light_magenta(), 1);
buf.set_span(x, (y1.saturating_add(1)).min(yt), &Span::from("-").light_magenta(), 1);
} else {
buf.set_span(x, (y1.saturating_sub(1)).max(barea.y), &Span::from("_").red(), 1);
buf.set_span(x, y1, &Span::from("#").red(), 1);
buf.set_span(x, (y1.saturating_add(1)).min(yt), &Span::from("-").red(), 1);
buf.set_span(x, (y2.saturating_sub(1)).max(barea.y), &Span::from("_").blue(), 1);
buf.set_span(x, y2, &Span::from("#").blue(), 1);
buf.set_span(x, (y2.saturating_add(1)).min(yt), &Span::from("-").blue(), 1);
}
}
let mut lines: Vec<Line>= Vec::new();
lines.push("Use W/S to change the counter. Enter to exit.".into());
lines.push(format!("Counter: {}", self.counter).into());
let text = Paragraph::new(lines).centered().style(style);
fr.render_widget(text, Rect::new(barea.width/2 - 25, barea.height/2, 50, 4));
}).map_err(|e| e.to_string())?;
Ok(())
}
async fn input(&mut self, event: terminput::Event) -> Result<(), String> {
if let terminput::Event::Key(kv) = event {
match kv.code {
KeyCode::Char('w') => {
self.counter = self.counter.wrapping_add(1);
},
KeyCode::Char('s') => {
self.counter = self.counter.saturating_sub(1);
},
_=> {}
}
}
Ok(())
}
async fn disconnected(&mut self) {
()
}
}

82
src/main.rs Normal file
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use std::{io::{Stdout, Write}, time::Duration};
use crossterm::event::Event;
use ratatui::{prelude::CrosstermBackend, Terminal};
use futures::{future::FutureExt, StreamExt};
mod app;
use app::MyApp;
use terminput::KeyCode;
use terminput_crossterm::to_terminput;
use termion::raw::{IntoRawMode, RawTerminal};
pub type Term = Terminal<CrosstermBackend<RawTerminal<Stdout>>>;
trait Demo: Send + Sized + 'static {
/// Needed to initialize state
fn new() -> Self;
/// Called to draw a frame
async fn frame(&mut self, term: &mut Term) -> Result<(), String>;
/// Called when user puts down input
async fn input(&mut self, event: terminput::Event) -> Result<(), String>;
/// Called on cleanup
async fn disconnected(&mut self);
}
#[tokio::main]
async fn main() -> Result<(), std::io::Error>{
let mut raw_term = std::io::stdout().into_raw_mode()?;
// Open alternate buffer
raw_term.write(b"\x1b[?1049h")?;
let mut term = Terminal::new(CrosstermBackend::new(raw_term))?;
let mut app = MyApp::new();
let mut input = crossterm::event::EventStream::new();
let mut frame_timer = tokio::time::interval(Duration::new(0, 16666)); // 16ms -> 60fps
loop {
tokio::select! {
ev = input.next().fuse() => if sh_input(ev, &mut app).await? {
app.disconnected().await;
break;
},
_ = frame_timer.tick() => app.frame(&mut term).await.map_err(err_map)?,
_ = tokio::signal::ctrl_c() => {
app.disconnected().await;
break;
},
}
}
// Clear screen and close the alternate buffer
term.backend_mut().write(b"\x1b[2J\x1b[?1049l")?;
Ok(())
}
async fn sh_input<A: Demo>(ev: Option<Result<Event, std::io::Error>>, app: &mut A) -> Result<bool, std::io::Error> {
match ev {
Some(Ok(event)) => {
let input = to_terminput(event).map_err(|e| std::io::Error::new(std::io::ErrorKind::Other, e))?;
if let Some(k) = input.as_key() && k.code == KeyCode::Enter {
// Exit on enter (Standard for demos)
Ok(true)
} else {
app.input(input).await.map(|_| false).map_err(err_map)
}
}
Some(Err(e)) => Err(e),
None => Ok(true),
}
}
fn err_map(e: String) -> std::io::Error {
std::io::Error::new(std::io::ErrorKind::Other, e)
}