74 lines
2.3 KiB
Rust
74 lines
2.3 KiB
Rust
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use crate::app::{App, AppResult};
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use crate::event::EventHandler;
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use crate::ui;
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use crossterm::event::{DisableMouseCapture, EnableMouseCapture};
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use crossterm::terminal::{self, EnterAlternateScreen, LeaveAlternateScreen};
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use ratatui::backend::Backend;
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use ratatui::Terminal;
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use std::io;
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use std::panic;
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/// Representation of a terminal user interface.
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///
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/// It is responsible for setting up the terminal,
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/// initializing the interface and handling the draw events.
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#[derive(Debug)]
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pub struct Tui<B: Backend> {
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/// Interface to the Terminal.
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terminal: Terminal<B>,
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/// Terminal event handler.
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pub events: EventHandler,
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}
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impl<B: Backend> Tui<B> {
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/// Constructs a new instance of [`Tui`].
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pub fn new(terminal: Terminal<B>, events: EventHandler) -> Self {
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Self { terminal, events }
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}
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/// Initializes the terminal interface.
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///
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/// It enables the raw mode and sets terminal properties.
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pub fn init(&mut self) -> AppResult<()> {
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terminal::enable_raw_mode()?;
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crossterm::execute!(io::stderr(), EnterAlternateScreen, EnableMouseCapture)?;
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let panic_hook = panic::take_hook();
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panic::set_hook(Box::new(move |panic| {
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Self::reset().expect("failed to reset the terminal");
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panic_hook(panic);
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}));
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self.terminal.hide_cursor()?;
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self.terminal.clear()?;
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Ok(())
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}
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/// [`Draw`] the terminal interface by [`rendering`] the widgets.
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///
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/// [`Draw`]: ratatui::Terminal::draw
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/// [`rendering`]: crate::ui::render
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pub fn draw(&mut self, app: &mut App) -> AppResult<()> {
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self.terminal.draw(|frame| ui::render(app, frame))?;
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Ok(())
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}
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/// Resets the terminal interface.
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///
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/// This function is also used for the panic hook to revert
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/// the terminal properties if unexpected errors occur.
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fn reset() -> AppResult<()> {
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terminal::disable_raw_mode()?;
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crossterm::execute!(io::stderr(), LeaveAlternateScreen, DisableMouseCapture)?;
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Ok(())
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}
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/// Exits the terminal interface.
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///
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/// It disables the raw mode and reverts back the terminal properties.
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pub fn exit(&mut self) -> AppResult<()> {
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Self::reset()?;
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self.terminal.show_cursor()?;
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Ok(())
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}
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}
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