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