arranger, transport: despaghettify

crates/tek_core/src/render_layered.rs

@@ -0,0 +1,29 @@
+use crate::*;
+
+pub struct Layered<'a>(Collection<'a>);
+
+impl<'a> Layered<'a> {
+    pub fn new () -> Self {
+        Self(Collection::new())
+    }
+}
+
+impl<'a> Render for Layered<'a> {
+    fn render (&self, buf: &mut Buffer, area: Rect) -> Usually<Rect> {
+        for layer in self.0.0.iter() {
+            layer.render(buf, area)?;
+        }
+        Ok(area)
+    }
+}
+
+impl<'a> Collect<'a> for Layered<'a> {
+    fn add_box (mut self, item: Box<dyn Render + 'a>) -> Self {
+        self.0 = self.0.add_box(item);
+        self
+    }
+    fn add_ref (mut self, item: &'a dyn Render) -> Self {
+        self.0 = self.0.add_ref(item);
+        self
+    }
+}