How to Use the crossterm/termion Crate for Terminal UIs

Use crossterm to configure the terminal for raw input and alternate screen mode, then pair it with ratatui to render widgets.

use crossterm::{
    event::{DisableMouseCapture, EnableMouseCapture, Event, KeyCode},
    execute,
    terminal::{disable_raw_mode, enable_raw_mode, EnterAlternateScreen, LeaveAlternateScreen},
};
use ratatui::{backend::CrosstermBackend, Terminal};
use std::io;

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

    // Render your UI here using terminal.draw(|f| { ... })

    disable_raw_mode()?;
    execute!(terminal.backend_mut(), LeaveAlternateScreen, DisableMouseCapture)?;
    terminal.show_cursor()?;
    Ok(())
}

The crossterm/termion crate turns your terminal into a full-screen app that captures every keystroke immediately without waiting for Enter. It works like switching from a standard text editor to a dedicated game window, giving you total control over the screen layout and input. You use it to build interactive dashboards or chat interfaces directly in the command line.