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|
use std::{
fs,
sync::mpsc::{self},
thread,
time::Duration,
};
use ratatui::{
Frame,
crossterm::event::{self, Event, KeyCode, KeyEvent, KeyEventKind},
layout::{Position, Rect},
style::{Color, Stylize},
widgets::{Block, Borders, Clear, Paragraph},
};
use ratatui_image::{
Resize, StatefulImage,
errors::Errors,
picker::Picker,
thread::{ResizeRequest, ResizeResponse, ThreadProtocol},
};
struct App {
async_state: ThreadProtocol,
last_known_size: Rect,
logo_pos: Position,
logo_size: f64,
source_code_lines: Vec<String>,
}
enum AppEvent {
KeyEvent(KeyEvent),
Redraw(Result<ResizeResponse, Errors>),
Tick,
}
fn main() -> Result<(), Box<dyn std::error::Error>> {
let mut terminal = ratatui::init();
let picker = Picker::from_query_stdio()?;
let dyn_img = image::ImageReader::open("./assets/NixOS.png")?.decode()?;
// Send a [ResizeProtocol] to resize and encode it in a separate thread.
let (tx_worker, rec_worker) = mpsc::channel::<ResizeRequest>();
// Send UI-events and the [ResizeProtocol] result back to main thread.
let (tx_main, rec_main) = mpsc::channel();
// Resize and encode in background thread.
let tx_main_render = tx_main.clone();
thread::spawn(move || {
loop {
if let Ok(request) = rec_worker.recv() {
tx_main_render
.send(AppEvent::Redraw(request.resize_encode()))
.unwrap();
}
}
});
// Poll events in background thread to demonstrate polling terminal events and redraw events
// concurrently. It's not required to do it this way - the "redraw event" from the channel
// could be read after polling the terminal events (as long as it's done with a timout). But
// then the rendering of the image will always be somewhat delayed.
let tx_main_events = tx_main.clone();
thread::spawn(move || -> Result<(), std::io::Error> {
loop {
if ratatui::crossterm::event::poll(Duration::from_millis(100))? {
if let Event::Key(key) = event::read()? {
tx_main_events.send(AppEvent::KeyEvent(key)).unwrap();
}
} else {
tx_main_events.send(AppEvent::Tick).unwrap();
}
}
});
let mut app = App {
async_state: ThreadProtocol::new(tx_worker, Some(picker.new_resize_protocol(dyn_img))),
last_known_size: Rect::default(),
logo_pos: Position { x: 1, y: 1 },
logo_size: 0.1,
source_code_lines: Vec::new(),
};
let source_code = fs::read_to_string("./examples/thread.rs")?;
app.source_code_lines = source_code.split("\n").map(|s| s.to_string()).collect();
loop {
terminal.draw(|f| ui(f, &mut app))?;
if let Ok(ev) = rec_main.try_recv() {
match ev {
AppEvent::KeyEvent(key) => {
if key.kind == KeyEventKind::Press && key.code == KeyCode::Char('q') {
break;
}
}
AppEvent::Redraw(completed) => {
let _ = app.async_state.update_resized_protocol(completed?);
}
AppEvent::Tick => {
if app.source_code_lines.len() > 1 {
app.source_code_lines.remove(0);
} else {
app.source_code_lines =
source_code.split("\n").map(|s| s.to_string()).collect();
}
if rand::random::<f64>() > 0.9 {
if app.logo_size < 1.0 {
app.logo_size += 0.1;
} else {
app.logo_size = 0.1;
}
}
}
}
}
}
ratatui::restore();
Ok(())
}
fn ui(f: &mut Frame<'_>, app: &mut App) {
let area = f.area();
let block = Block::default()
.borders(Borders::ALL)
.title("Thread test")
.bg(Color::Blue);
let inner_area = block.inner(area);
f.render_widget(block, area);
for (i, y) in (inner_area.y..inner_area.height).enumerate() {
if i >= app.source_code_lines.len() {
break;
}
let p = Paragraph::new(app.source_code_lines[i].clone());
f.render_widget(p, Rect::new(inner_area.x, y, inner_area.width, 1));
}
let size_for = app.async_state.size_for(Resize::Fit(None), inner_area);
let mut size = size_for.unwrap_or(app.last_known_size);
app.last_known_size = size;
size.width = (f64::from(size.width) * app.logo_size).ceil() as u16;
size.height = (f64::from(size.height) * app.logo_size).ceil() as u16;
let mut image_block_area = size;
image_block_area.width += 2;
image_block_area.height += 2;
image_block_area.x = app.logo_pos.x;
image_block_area.y = app.logo_pos.y;
let image_block = Block::default()
.borders(Borders::ALL)
.title("Nix")
.bg(Color::White);
let block_inner_area = image_block.inner(image_block_area);
if image_block_area.width <= inner_area.width && image_block_area.height <= inner_area.height {
f.render_widget(image_block, image_block_area);
f.render_widget(Clear, block_inner_area);
f.render_widget(Block::new().bg(Color::White), block_inner_area);
if size_for.is_some() {
f.render_stateful_widget(StatefulImage::new(), block_inner_area, &mut app.async_state);
}
}
}
|
