added enter and backspace commands

src/main.rs

@@ -17,9 +17,18 @@ use ratatui::{
 };
 use ratatui::backend::CrosstermBackend;
 
+#[derive(Clone)]
+enum View {
+    Categories,
+    Placeholder(String), // temporary for testing navigation
+}
+
 struct App {
     should_exit: bool,
     status: String,
+
+    view_stack: Vec<View>,
+
     items: Vec<String>,
     selected: usize,
 }
@@ -29,6 +38,8 @@ impl Default for App {
         Self {
             should_exit: false,
             status: "Press q to quit".to_string(),
+            view_stack: vec![View::Categories],
+
             items: vec![
                 "Shows".into(),
                 "Movies".into(),
@@ -45,6 +56,12 @@ impl Default for App {
     }
 }
 
+impl App {
+    fn current_view(&self) -> &View {
+        self.view_stack.last().unwrap()
+    }
+}
+
 fn main() -> io::Result<()> {
     // Terminal setup
     enable_raw_mode()?;
@@ -93,6 +110,26 @@ fn handle_key(app: &mut App, code: KeyCode) {
     match code {
         KeyCode::Char('q') => app.should_exit = true,
 
+        KeyCode::Enter => {
+            match app.current_view() {
+                View::Categories => {
+                    let selected = app.items[app.selected].clone();
+                    app.view_stack.push(View::Placeholder(selected.clone()));
+                    app.status = format!("Entered {}", selected);
+                    app.selected = 0;
+                }
+                _ => {}
+            }
+        }
+
+        KeyCode::Esc | KeyCode::Backspace => {
+            if app.view_stack.len() > 1 {
+                app.view_stack.pop();
+                app.status = "Went back".to_string();
+                app.selected = 0;
+            }
+        }
+
         KeyCode::Up | KeyCode::Char('k') => {
             if app.items.is_empty() {
                 return;
@@ -123,30 +160,16 @@ fn ui(frame: &mut Frame, app: &App) {
     // Top
     frame.render_widget(Block::bordered().title("cj-jftui"), panes.top);
 
-    // Left Main
-    let items: Vec<ListItem> = app
-    .items
-    .iter()
-    .map(|s| ListItem::new(s.as_str()))
-    .collect();
+    // Main
 
-    let list = List::new(items)
-        .block(Block::bordered().title("List").merge_borders(MergeStrategy::Exact))
-        .highlight_symbol("> ")
-        .highlight_style(Style::default().add_modifier(Modifier::REVERSED));
-
-    let mut state = ListState::default();
-    state.select(Some(app.selected));
-
-    frame.render_stateful_widget(list, panes.left_main, &mut state);
-
-    //Right Main
-    let detail = format!("Details for:\n\n{}", app.items[app.selected]);
-    frame.render_widget(
-        Paragraph::new(detail)
-            .block(Block::bordered().title("Details").merge_borders(MergeStrategy::Exact)),
-        panes.right_main,
-    );
+    match app.current_view() {
+        View::Categories => {
+            render_categories(frame, app, panes.left_main, panes.right_main);
+        }
+        View::Placeholder(name) => {
+            render_placeholder(frame, name, panes.left_main, panes.right_main);
+        }
+    }
 
     // Bottom
     frame.render_widget(
@@ -160,6 +183,45 @@ fn ui(frame: &mut Frame, app: &App) {
     );
 }
 
+fn render_categories(frame: &mut Frame, app: &App, left: Rect, right: Rect) {
+    let items: Vec<ListItem> = app
+        .items
+        .iter()
+        .map(|s| ListItem::new(s.as_str()))
+        .collect();
+
+    let list = List::new(items)
+        .block(Block::bordered().title("Categories").merge_borders(MergeStrategy::Exact))
+        .highlight_symbol("> ")
+        .highlight_style(Style::default().add_modifier(Modifier::REVERSED));
+
+    let mut state = ListState::default();
+    state.select(Some(app.selected));
+
+    frame.render_stateful_widget(list, left, &mut state);
+
+    let detail = format!("Details for:\n\n{}", app.items[app.selected]);
+    frame.render_widget(
+        Paragraph::new(detail)
+            .block(Block::bordered().title("Details").merge_borders(MergeStrategy::Exact)),
+        right,
+    );
+}
+
+fn render_placeholder(frame: &mut Frame, name: &str, left: Rect, right: Rect) {
+    frame.render_widget(
+        Paragraph::new(format!("Inside {}\n\nPress Esc to go back", name))
+            .block(Block::bordered().title("Library").merge_borders(MergeStrategy::Exact)),
+        left,
+    );
+
+    frame.render_widget(
+        Paragraph::new("Right pane reserved for item details / thumbnails")
+            .block(Block::bordered().title("Details").merge_borders(MergeStrategy::Exact)),
+        right,
+    );
+}
+
 struct Panes {
     top: Rect,
     left_main: Rect,