pub trait Backend {
fn draw<'a, I>(&mut self, content: I) -> Result<(), Error>
where
I: Iterator<Item = (u16, u16, &'a Cell)>;
fn hide_cursor(&mut self) -> Result<(), Error>;
fn show_cursor(&mut self) -> Result<(), Error>;
fn get_cursor(&mut self) -> Result<(u16, u16), Error>;
fn set_cursor(&mut self, x: u16, y: u16) -> Result<(), Error>;
fn clear(&mut self) -> Result<(), Error>;
fn size(&self) -> Result<Rect, Error>;
fn flush(&mut self) -> Result<(), Error>;
}