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use std::io::{self, stdout, Write};
use ratatui::backend::TermionBackend;
use ratatui::widgets::Widget;
use termion::raw::{IntoRawMode, RawTerminal};
use termion::screen::AlternateScreen;
use termion::screen::IntoAlternateScreen;
use termion::input::MouseTerminal;
trait New {
fn new() -> io::Result<Self>
where
Self: Sized;
}
pub enum Screen {
WithMouse(MouseTerminal<AlternateScreen<RawTerminal<std::io::Stdout>>>),
WithoutMouse(AlternateScreen<RawTerminal<std::io::Stdout>>),
}
impl Screen {
// Returns alternate screen
fn new(mouse_support: bool) -> io::Result<Self> {
let stdout = io::stdout().into_raw_mode()?;
if mouse_support {
Ok(Self::WithMouse(MouseTerminal::from(
stdout.into_alternate_screen().unwrap(),
)))
} else {
Ok(Self::WithoutMouse(stdout.into_alternate_screen().unwrap()))
}
}
}
impl Write for Screen {
fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
match self {
Screen::WithMouse(t) => t.write(buf),
Screen::WithoutMouse(t) => t.write(buf),
}
}
fn flush(&mut self) -> io::Result<()> {
match self {
Screen::WithMouse(t) => t.flush(),
Screen::WithoutMouse(t) => t.flush(),
}
}
}
// pub type TuiBackend = TermionBackend<Screen>;
pub type TuiTerminal = ratatui::Terminal<TermionBackend<Screen>>;
pub struct AppBackend {
pub terminal: Option<TuiTerminal>,
}
impl AppBackend {
pub fn new(mouse_support: bool) -> io::Result<Self> {
let mut alt_screen = Screen::new(mouse_support)?;
// clears the screen of artifacts
write!(alt_screen, "{}", termion::clear::All)?;
let backend = TermionBackend::new(alt_screen);
let mut terminal = ratatui::Terminal::new(backend)?;
terminal.hide_cursor()?;
Ok(Self {
terminal: Some(terminal),
})
}
pub fn render<W>(&mut self, widget: W)
where
W: Widget,
{
let _ = self.terminal_mut().draw(|frame| {
let rect = frame.size();
frame.render_widget(widget, rect);
});
}
pub fn terminal_ref(&self) -> &TuiTerminal {
self.terminal.as_ref().unwrap()
}
pub fn terminal_mut(&mut self) -> &mut TuiTerminal {
self.terminal.as_mut().unwrap()
}
pub fn terminal_drop(&mut self) {
let _ = self.terminal.take();
let _ = stdout().flush();
}
pub fn terminal_restore(&mut self, mouse_support: bool) -> io::Result<()> {
let mut new_backend = Self::new(mouse_support)?;
std::mem::swap(&mut self.terminal, &mut new_backend.terminal);
Ok(())
}
}
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