use crate::*;
/// Display mode of arranger
#[derive(Clone, PartialEq)]
pub enum ArrangerMode {
    /// Tracks are columns
    V(usize),
    /// Tracks are rows
    H,
}
impl<E: Engine> Content<E> for ArrangerMode {}
/// Arranger display mode can be cycled
impl ArrangerMode {
    /// Cycle arranger display mode
    pub fn next (&mut self) {
        *self = match self {
            Self::H    => Self::V(1),
            Self::V(1) => Self::V(2),
            Self::V(2) => Self::V(2),
            Self::V(0) => Self::H,
            Self::V(_) => Self::V(0),
        }
    }
}
fn any_size <E: Engine> (_: E::Size) -> Perhaps<E::Size>{
    Ok(Some([0.into(),0.into()].into()))
}