extract has_sampler

sampler/src/has_sampler.rs

@@ -0,0 +1,30 @@
+use crate::*;
+pub trait HasSampler {
+    fn sampler (&self) -> &Option<Sampler>;
+    fn sampler_mut (&mut self) -> &mut Option<Sampler>;
+    fn sample_index (&self) -> usize;
+    fn view_sample <'a> (&'a self, compact: bool) -> impl Content<TuiOut> + 'a {
+        self.sampler().as_ref().map(|sampler|Max::y(
+            if compact { 0u16 } else { 5 }.into(),
+            Fill::x(sampler.viewer(self.sample_index()))
+        ))
+    }
+    fn view_sampler <'a> (&'a self, compact: bool, editor: &Option<MidiEditor>) -> impl Content<TuiOut> + 'a {
+        self.sampler().as_ref().map(|sampler|Fixed::x(
+            if compact { 4u16 } else { 40 }.into(),
+            Push::y(
+                if compact { 1u16 } else { 0 }.into(),
+                editor.as_ref().map(|e|Fill::y(sampler.list(compact, e)))
+            )
+        ))
+    }
+}
+#[macro_export] macro_rules! has_sampler {
+    (|$self:ident:$Struct:ty| { sampler = $e0:expr; index = $e1:expr; }) => {
+        impl HasSampler for $Struct {
+            fn sampler (&$self) -> &Option<Sampler> { &$e0 }
+            fn sampler_mut (&mut $self) -> &mut Option<Sampler> { &mut $e0 }
+            fn sample_index (&$self) -> usize { $e1 }
+        }
+    }
+}