tui 0.9.5

A library to build rich terminal user interfaces or dashboards
Documentation 
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#[allow(dead_code)]
mod util;

use crate::util::event::{Event, Events};
use std::{error::Error, io};
use termion::{event::Key, input::MouseTerminal, raw::IntoRawMode, screen::AlternateScreen};
use tui::{
    backend::TermionBackend,
    layout::{Constraint, Direction, Layout},
    style::{Color, Modifier, Style},
    widgets::{Block, BorderType, Borders},
    Terminal,
};

fn main() -> Result<(), Box<dyn Error>> {
    // Terminal initialization
    let stdout = io::stdout().into_raw_mode()?;
    let stdout = MouseTerminal::from(stdout);
    let stdout = AlternateScreen::from(stdout);
    let backend = TermionBackend::new(stdout);
    let mut terminal = Terminal::new(backend)?;
    terminal.hide_cursor()?;

    // Setup event handlers
    let events = Events::new();

    loop {
        terminal.draw(|mut f| {
            // Wrapping block for a group
            // Just draw the block and the group on the same area and build the group
            // with at least a margin of 1
            let size = f.size();
            let block = Block::default()
                .borders(Borders::ALL)
                .title("Main block with round corners")
                .border_type(BorderType::Rounded);
            f.render_widget(block, size);
            let chunks = Layout::default()
                .direction(Direction::Vertical)
                .margin(4)
                .constraints([Constraint::Percentage(50), Constraint::Percentage(50)].as_ref())
                .split(f.size());
            {
                let chunks = Layout::default()
                    .direction(Direction::Horizontal)
                    .constraints([Constraint::Percentage(50), Constraint::Percentage(50)].as_ref())
                    .split(chunks[0]);
                let block = Block::default()
                    .title("With background")
                    .title_style(Style::default().fg(Color::Yellow))
                    .style(Style::default().bg(Color::Green));
                f.render_widget(block, chunks[0]);
                let title_style = Style::default()
                    .fg(Color::White)
                    .bg(Color::Red)
                    .modifier(Modifier::BOLD);
                let block = Block::default()
                    .title("Styled title")
                    .title_style(title_style);
                f.render_widget(block, chunks[1]);
            }
            {
                let chunks = Layout::default()
                    .direction(Direction::Horizontal)
                    .constraints([Constraint::Percentage(50), Constraint::Percentage(50)].as_ref())
                    .split(chunks[1]);
                let block = Block::default().title("With borders").borders(Borders::ALL);
                f.render_widget(block, chunks[0]);
                let block = Block::default()
                    .title("With styled borders and doubled borders")
                    .border_style(Style::default().fg(Color::Cyan))
                    .borders(Borders::LEFT | Borders::RIGHT)
                    .border_type(BorderType::Double);
                f.render_widget(block, chunks[1]);
            }
        })?;

        if let Event::Input(key) = events.next()? {
            if key == Key::Char('q') {
                break;
            }
        }
    }
    Ok(())
}