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use crate::frontend::app::{App, AppResult};
use crate::frontend::event::EventHandler;
use crossterm::event::{DisableMouseCapture, EnableMouseCapture};
use crossterm::terminal::{self, EnterAlternateScreen, LeaveAlternateScreen};
use ratatui::backend::Backend;
use ratatui::Terminal;
use std::io;
use std::panic;
/// Representation of a terminal user interface.
///
/// It is responsible for setting up the terminal,
/// initializing the interface and handling the draw events.
#[derive(Debug)]
pub struct Tui<B: Backend> {
/// Interface to the Terminal.
terminal: Terminal<B>,
/// Terminal event handler.
pub events: EventHandler,
}
impl<B: Backend> Tui<B> {
/// Constructs a new instance of [`Tui`].
pub fn new(terminal: Terminal<B>, events: EventHandler) -> Self {
Self { terminal, events }
}
/// Initializes the terminal interface.
///
/// It enables the raw mode and sets terminal properties.
pub fn init(&mut self) -> AppResult<()> {
terminal::enable_raw_mode()?;
crossterm::execute!(io::stdout(), EnterAlternateScreen, EnableMouseCapture)?;
// Define a custom panic hook to reset the terminal properties.
// This way, you won't have your terminal messed up if an unexpected error happens.
let panic_hook = panic::take_hook();
panic::set_hook(Box::new(move |panic| {
Self::reset().expect("failed to reset the terminal");
panic_hook(panic);
}));
self.terminal.hide_cursor()?;
self.terminal.clear()?;
Ok(())
}
/// [`Draw`] the terminal interface by [`rendering`] the widgets.
///
/// [`Draw`]: ratatui::Terminal::draw
/// [`rendering`]: crate::ui::render
pub fn draw(&mut self, app: &mut App) -> AppResult<()> {
// self.terminal.draw(|frame| ui::render(app, frame))?;
self.terminal
.draw(|frame| frame.render_widget(app, frame.area()))?;
Ok(())
}
/// Resets the terminal interface.
///
/// This function is also used for the panic hook to revert
/// the terminal properties if unexpected errors occur.
fn reset() -> AppResult<()> {
terminal::disable_raw_mode()?;
crossterm::execute!(io::stdout(), LeaveAlternateScreen, DisableMouseCapture)?;
Ok(())
}
/// Exits the terminal interface.
///
/// It disables the raw mode and reverts back the terminal properties.
pub fn exit(&mut self) -> AppResult<()> {
Self::reset()?;
self.terminal.show_cursor()?;
Ok(())
}
}
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