1 files changed, 82 insertions, 0 deletions
diff --git a/src/stateful_list.rs b/src/stateful_list.rs
new file mode 100644
index 0000000..50c71cc
--- /dev/null
+++ b/src/stateful_list.rs
@@ -0,0 +1,82 @@
+// This file is part of Germ <https://github.com/gemrest/sydney>.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, version 3.
+//
+// This program is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+// General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+//
+// Copyright (C) 2022-2022 Fuwn <[email protected]>
+// SPDX-License-Identifier: GPL-3.0-only
+
+//! <https://github.com/fdehau/tui-rs/blob/master/examples/list.rs>
+
+use tui::widgets::ListState;
+
+pub struct StatefulList<T> {
+  pub state:    ListState,
+  pub items:    Vec<T>,
+  pub selected: usize,
+}
+
+impl<T> StatefulList<T> {
+  pub fn with_items(items: Vec<T>) -> Self {
+    Self {
+      state: ListState::default(),
+      items,
+      selected: 0,
+    }
+  }
+
+  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.selected = i;
+
+    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.selected = i;
+
+    self.state.select(Some(i));
+  }
+
+  pub fn last(&mut self) {
+    self.state.select(Some(self.items.len() - 1));
+
+    self.selected = self.items.len() - 1;
+  }
+
+  pub fn first(&mut self) {
+    self.state.select(Some(0));
+
+    self.selected = 0;
+  }
+
+  pub fn unselect(&mut self) { self.state.select(None); }
+}