refactor: refactor code layout by moving ui to another crates

src/ui/list.rs

@@ -0,0 +1,61 @@
+use tui::widgets::ListState;
+
+pub struct StatefulList<T> {
+    pub state: ListState,
+    pub items: Vec<T>,
+}
+
+impl<T> StatefulList<T> {
+    pub fn with_items(items: Vec<T>) -> StatefulList<T> {
+        StatefulList {
+            state: ListState::default(),
+            items,
+        }
+    }
+
+    pub fn begin(&mut self) {
+        self.state.select(Some(0))
+    }
+
+    pub fn end(&mut self) {
+        self.state.select(Some(self.items.len() - 1))
+    }
+
+    pub fn next(&mut self) {
+        let i = match self.state.selected() {
+            Some(i) => {
+                if i == self.items.len() - 1 {
+                    0
+                } else {
+                    i + 1
+                }
+            }
+            None => 0,
+        };
+        self.state.select(Some(i));
+    }
+
+    pub fn previous(&mut self) {
+        let i = match self.state.selected() {
+            Some(i) => {
+                if i == 0 {
+                    self.items.len() - 1
+                } else {
+                    i - 1
+                }
+            }
+            None => 0,
+        };
+        self.state.select(Some(i));
+    }
+
+    pub fn unselect(&mut self) {
+        self.state.select(None);
+    }
+    pub fn push(&mut self, item: T) {
+        self.items.push(item);
+    }
+    pub fn iter(&self) -> impl Iterator<Item = &T> {
+        self.items.iter()
+    }
+}