refactor: statefulList next/previous

src/app_data/container_state.rs

@@ -172,27 +172,25 @@ impl<T> StatefulList<T> {
 
     pub fn next(&mut self) {
         if !self.items.is_empty() {
-            let i = match self.state.selected() {
+            self.state.select(Some(self.state.selected().map_or(0, |i| {
-                Some(i) => {
                 if i < self.items.len() - 1 {
                     i + 1
                 } else {
                     i
                 }
-                }
+            })));
-                None => 0,
-            };
-            self.state.select(Some(i));
         }
     }
 
     pub fn previous(&mut self) {
         if !self.items.is_empty() {
-            let i = self
+            self.state.select(Some(self.state.selected().map_or(0, |i| {
-                .state
+                if i == 0 {
-                .selected()
+                    0
-                .map_or(0, |i| if i == 0 { 0 } else { i - 1 });
+                } else {
-            self.state.select(Some(i));
+                    i - 1
+                }
+            })));
         }
     }