use crate::*;
impl Handle<Tui> for TransportToolbar<Tui> {
    fn handle (&mut self, from: &TuiInput) -> Perhaps<bool> {
        match from.event() {
            key!(KeyCode::Left)  => { self.focus.prev(); },
            key!(KeyCode::Right) => { self.focus.next(); },
            _ => match self.focus {
                TransportToolbarFocus::PlayPause => return self.handle_play_pause(from),
                TransportToolbarFocus::Bpm       => return self.handle_bpm(from),
                TransportToolbarFocus::Quant     => return self.handle_quant(from),
                TransportToolbarFocus::Sync      => return self.handle_sync(from),
                TransportToolbarFocus::Clock     => {/*todo*/},
            }
        }
        Ok(Some(true))
    }
}
impl TransportToolbar<Tui> {
    fn handle_play_pause (&mut self, from: &TuiInput) -> Perhaps<bool> {
        match from.event() {
            key!(KeyCode::Enter) => self.toggle_play().map(|_|())?,
            _ => return Ok(None)
        }
        Ok(Some(true))
    }
    fn handle_bpm (&mut self, from: &TuiInput) -> Perhaps<bool> {
        match from.event() {
            key!(KeyCode::Char(',')) => { self.bpm -= 1.0;   },
            key!(KeyCode::Char('.')) => { self.bpm += 1.0;   },
            key!(KeyCode::Char('<')) => { self.bpm -= 0.001; },
            key!(KeyCode::Char('>')) => { self.bpm += 0.001; },
            _ => return Ok(None)
        }
        Ok(Some(true))
    }
    fn handle_quant (&mut self, from: &TuiInput) -> Perhaps<bool> {
        match from.event() {
            key!(KeyCode::Char(',')) => { self.quant = prev_note_length(self.quant); },
            key!(KeyCode::Char('.')) => { self.quant = next_note_length(self.quant); },
            _ => return Ok(None)
        }
        return Ok(Some(true))
    }
    fn handle_sync (&mut self, from: &TuiInput) -> Perhaps<bool> {
        match from.event() {
            key!(KeyCode::Char(',')) => { self.sync = prev_note_length(self.sync); },
            key!(KeyCode::Char('.')) => { self.sync = next_note_length(self.sync); },
            _ => return Ok(None)
        }
        return Ok(Some(true))
    }
}