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|
use crossterm::event::{DisableMouseCapture, EnableMouseCapture};
use crossterm::terminal::{
disable_raw_mode, enable_raw_mode, EnterAlternateScreen, LeaveAlternateScreen,
};
use ratatui::backend::CrosstermBackend;
use ratatui::layout::{Constraint, Layout};
use ratatui::style::{Color, Style};
use ratatui::widgets::{Block, Borders};
use ratatui::Terminal;
use std::io;
use tui_textarea::{Input, Key, TextArea};
fn validate(textarea: &mut TextArea) -> bool {
if let Err(err) = textarea.lines()[0].parse::<f64>() {
textarea.set_style(Style::default().fg(Color::LightRed));
textarea.set_block(
Block::default()
.borders(Borders::ALL)
.border_style(Color::LightRed)
.title(format!("ERROR: {}", err)),
);
false
} else {
textarea.set_style(Style::default().fg(Color::LightGreen));
textarea.set_block(
Block::default()
.border_style(Color::LightGreen)
.borders(Borders::ALL)
.title("OK"),
);
true
}
}
fn main() -> io::Result<()> {
let stdout = io::stdout();
let mut stdout = stdout.lock();
enable_raw_mode()?;
crossterm::execute!(stdout, EnterAlternateScreen, EnableMouseCapture)?;
let backend = CrosstermBackend::new(stdout);
let mut term = Terminal::new(backend)?;
let mut textarea = TextArea::default();
textarea.set_cursor_line_style(Style::default());
textarea.set_placeholder_text("Enter a valid float (e.g. 1.56)");
let layout = Layout::default().constraints([Constraint::Length(3), Constraint::Min(1)]);
let mut is_valid = validate(&mut textarea);
loop {
term.draw(|f| {
let chunks = layout.split(f.area());
f.render_widget(&textarea, chunks[0]);
})?;
match crossterm::event::read()?.into() {
Input { key: Key::Esc, .. } => break,
Input {
key: Key::Enter, ..
} if is_valid => break,
Input {
key: Key::Char('m'),
ctrl: true,
..
}
| Input {
key: Key::Enter, ..
} => {}
input => {
// TextArea::input returns if the input modified its text
if textarea.input(input) {
is_valid = validate(&mut textarea);
}
}
}
}
disable_raw_mode()?;
crossterm::execute!(
term.backend_mut(),
LeaveAlternateScreen,
DisableMouseCapture
)?;
term.show_cursor()?;
println!("Input: {:?}", textarea.lines()[0]);
Ok(())
}
|
