enter/exit submenus

Signed-off-by: Frank Villaro-Dixon <frank@villaro-dixon.eu>

src/apps.rs

@@ -1,3 +1,5 @@
+use std::thread::current;
+
 pub struct BeoApps {
     pub apps: Vec<Box<dyn App>>,
 }
@@ -11,6 +13,24 @@ impl AppBase {
     pub fn name(&self) -> &str {
         &self.name
     }
+
+    pub fn enter_submenu(&mut self, submenu_id: usize) {
+        let mut current_menu = &mut self.main_menu;
+        while let Some(ref mut selected_submenu) = current_menu.selected_submenu {
+            current_menu = selected_submenu
+        }
+        current_menu.set_submenu_id(submenu_id)
+    }
+
+    pub fn exit_submenu(&mut self) {
+        let current_menu = &mut self.main_menu;
+        while let Some(ref mut selected_submenu) = current_menu.selected_submenu {
+            if selected_submenu.selected_submenu.is_none() {
+                current_menu.selected_submenu = None;
+                return;
+            }
+        }
+    }
 }
 
 #[derive(Debug, Clone)]

src/ui.rs

@@ -126,9 +126,7 @@ impl BeoUi {
                         self.current_app_mut()
                             .unwrap()
                             .base_mut()
-                            .main_menu
-                            .get_deepest_selected_submenu_mut()
-                            .set_submenu_id(submenu_id);
+                            .enter_submenu(submenu_id);
                         self.angle_shift = 0.0;
                     }
                     None => {
@@ -137,6 +135,8 @@ impl BeoUi {
                 }
             }
             Beo5Event::RightButtonPressed => {
+                // That means that we get out of a submenu
+                self.current_app_mut().unwrap().base_mut().exit_submenu();
                 println!("Right button pressed");
             }
             Beo5Event::SelectionWheelRel(rel_angle_eps) => {