separate tui model and view layers

crates/tek_tui/src/tui_view_file_browser.rs

@@ -0,0 +1,24 @@
+use crate::*;
+
+impl Content for FileBrowser {
+    type Engine = Tui;
+    fn content (&self) -> impl Widget<Engine = Tui> {
+        Stack::down(|add|{
+            let mut i = 0;
+            for (_, name) in self.dirs.iter() {
+                if i >= self.scroll {
+                    add(&TuiStyle::bold(name.as_str(), i == self.index))?;
+                }
+                i += 1;
+            }
+            for (_, name) in self.files.iter() {
+                if i >= self.scroll {
+                    add(&TuiStyle::bold(name.as_str(), i == self.index))?;
+                }
+                i += 1;
+            }
+            add(&format!("{}/{i}", self.index))?;
+            Ok(())
+        })
+    }
+}