refactor: device abstraction, layout components

src/layout.rs

@@ -0,0 +1,37 @@
+use crate::prelude::*;
+
+pub struct Rows(pub Vec<Box<dyn Device>>);
+
+pub struct Columns(pub Vec<Box<dyn Device>>);
+
+impl Device for Rows {
+    fn handle (&mut self, event: &EngineEvent) -> Result<(), Box<dyn Error>> {
+        Ok(())
+    }
+    fn render (&self, buf: &mut Buffer, area: Rect) {
+        for i in 0..3 {
+            self.0[i].render(buf, Rect {
+                x: area.x,
+                y: area.height / 3 * i as u16,
+                width: area.width,
+                height: area.height / 3
+            })
+        }
+    }
+}
+
+impl Device for Columns {
+    fn handle (&mut self, event: &EngineEvent) -> Result<(), Box<dyn Error>> {
+        Ok(())
+    }
+    fn render (&self, buf: &mut Buffer, area: Rect) {
+        for i in 0..3 {
+            self.0[i].render(buf, Rect {
+                x: area.width / 3 * i as u16,
+                y: area.y,
+                width: area.width / 3,
+                height: area.height
+            })
+        }
+    }
+}