don't crash on add track/scene

src/view.rs

@@ -5,7 +5,9 @@ pub mod transport;
 pub mod plugin;
 pub mod border;
 pub mod theme;
+pub mod split;
 
+pub use self::split::*;
 pub use self::border::*;
 pub use self::theme::*;
 pub use self::arranger::*;
@@ -28,70 +30,3 @@ render!(App |self, buf, area| {
     }
     Ok(area)
 });
-
-pub struct If<'a>(pub bool, pub &'a (dyn Render + Sync));
-
-impl<'a> Render for If<'a> {
-    fn render (&self, buf: &mut Buffer, area: Rect) -> Usually<Rect> {
-        if self.0 {
-            self.1.render(buf, area)
-        } else {
-            ().render(buf, area)
-        }
-    }
-}
-
-pub trait Modal<T>: Device {
-    fn handle_with_state (&self, state: &mut T, event: &AppEvent) -> Usually<bool>;
-}
-
-#[derive(Copy, Clone)]
-pub enum Direction { Down, Right }
-
-impl Direction {
-    pub fn split <'a, const N: usize> (&self, items: [&'a (dyn Render + Sync);N]) -> Split<'a, N> {
-        Split(*self, items)
-    }
-    pub fn is_down (&self) -> bool {
-        match self { Self::Down => true, _ => false }
-    }
-    pub fn is_right (&self) -> bool {
-        match self { Self::Right => true, _ => false }
-    }
-}
-
-pub struct Split<'a, const N: usize>(
-    pub Direction, pub [&'a (dyn Render + Sync);N]
-);
-
-impl<'a, const N: usize> Split<'a, N> {
-    pub fn down (items: [&'a (dyn Render + Sync);N]) -> Self {
-        Self(Direction::Down, items)
-    }
-    pub fn right (items: [&'a (dyn Render + Sync);N]) -> Self {
-        Self(Direction::Right, items)
-    }
-}
-
-impl<'a, const N: usize> Render for Split<'a, N> {
-    fn render (&self, buf: &mut Buffer, area: Rect) -> Usually<Rect> {
-        let Rect { mut x, mut y, mut width, mut height } = area;
-        for item in self.1 {
-            if width == 0 || height == 0 {
-                break
-            }
-            let result = item.render(buf, Rect { x, y, width, height })?;
-            match self.0 {
-                Direction::Down => {
-                    y = y + result.height;
-                    height = height.saturating_sub(result.height);
-                },
-                Direction::Right => {
-                    x = x + result.width;
-                    width = width.saturating_sub(result.width);
-                },
-            }
-        }
-        Ok(area)
-    }
-}