wip: trying focus traits and macros again

crates/tek_core/src/focus.rs

@@ -0,0 +1,70 @@
+use crate::*;
+
+pub trait Focus <const N: usize>: Render + Handle {
+    fn focus (&self) -> usize;
+    fn focus_mut (&mut self) -> &mut usize;
+    fn focusable (&self) -> [&dyn Focusable;N];
+    fn focusable_mut (&mut self) -> [&mut dyn Focusable;N];
+
+    fn focused (&self) -> &dyn Focusable {
+        let focus = self.focus();
+        self.focusable()[focus]
+    }
+    fn focused_mut (&mut self) -> &mut dyn Focusable {
+        let focus = self.focus();
+        self.focusable_mut()[focus]
+    }
+    fn focus_prev (&mut self) {
+        let focus = self.focus();
+        let focus = if focus > 0 { N - 1 } else { focus - 1 };
+        *self.focus_mut() = focus;
+    }
+    fn focus_next (&mut self) {
+        let focus = self.focus();
+        let focus = if focus < N - 1 { focus + 1 } else { 0 };
+        *self.focus_mut() = focus;
+    }
+}
+
+pub trait Focusable: Render + Handle {
+    fn is_focused (&self) -> bool;
+    fn set_focused (&mut self, focused: bool);
+}
+
+#[macro_export] macro_rules! focus {
+    ($struct:ident ($focus:ident) : $count:expr => [
+       $($focusable:ident),*
+    ]) => {
+        impl Focus<$count> for $struct {
+            fn focus (&self) -> usize {
+                self.$focus
+            }
+            fn focus_mut (&mut self) -> &mut usize {
+                &mut self.$focus
+            }
+            fn focusable (&self) -> [&dyn Focusable;$count] {
+                [
+                    $(&self.$focusable as &dyn Focusable,)*
+                ]
+            }
+            fn focusable_mut (&mut self) -> [&mut dyn Focusable;2] {
+                [
+                    $(&mut self.$focusable as &mut dyn Focusable,)*
+                ]
+            }
+        }
+    }
+}
+
+#[macro_export] macro_rules! focusable {
+    ($struct:ident ($focused:ident)) => {
+        impl Focusable for $struct {
+            fn is_focused (&self) -> bool {
+                self.$focused
+            }
+            fn set_focused (&mut self, focused: bool) {
+                self.$focused = focused
+            }
+        }
+    }
+}

crates/tek_core/src/lib.rs

@@ -45,6 +45,7 @@ use crossterm::terminal::{
 
 submod! {
     exit
+    focus
     handle
     handle_keymap
     jack_core

crates/tek_sequencer/src/arranger.rs

@@ -1,7 +1,5 @@
 //! Clip launcher and arrangement editor.
-
 use crate::*;
-use tek_core::Direction;
 
 /// Represents the tracks and scenes of the composition.
 pub struct Arranger {

crates/tek_sequencer/src/arranger_main.rs

@@ -18,33 +18,7 @@ struct ArrangerStandalone {
     focus:           usize,
 }
 
-impl ArrangerStandalone {
-    fn focus_prev (&mut self) {
-        self.focus = if self.focus > 0 { 1 } else { self.focus - 1 };
-    }
-    fn focus_next (&mut self) {
-        self.focus = if self.focus < 1 { self.focus + 1 } else { 0 };
-    }
-    fn focused (&self) -> &dyn Render {
-        self.focusable()[self.focus]
-    }
-    fn focusable (&self) -> [&dyn Render;2] {
-        [
-            &self.transport as &dyn Render,
-            &self.arranger  as &dyn Render,
-        ]
-    }
-    fn focused_mut (&mut self) -> &mut dyn Handle {
-        let focus = self.focus;
-        self.focusable_mut()[focus]
-    }
-    fn focusable_mut (&mut self) -> [&mut dyn Handle;2] {
-        [
-            &mut self.transport as &mut dyn Handle,
-            &mut self.arranger  as &mut dyn Handle
-        ]
-    }
-}
+focus!(ArrangerStandalone (focus) : 2 => [ transport, arranger ]);
 
 #[derive(Debug, Parser)]
 #[command(version, about, long_about = None)]