ui/curses: add curses interface draft

pqcli/ui/curses/widgets/list_box.py

@@ -0,0 +1,40 @@
+import curses
+import enum
+import typing as T
+
+from .scrollable import Scrollable
+
+
+class ListBox(Scrollable):
+    _items: T.List[str]
+
+    def add(self, text: str) -> None:
+        self._items.append(text)
+        self.scroll_to_item(-1)
+
+    def set(self, idx: int, value: str) -> None:
+        if idx < 0:
+            idx %= len(self._items)
+        self._items[idx] = value
+
+    def get(self, idx: int) -> T.Optional[str]:
+        if not self._items:
+            return None
+        if idx < 0:
+            idx %= len(self._items)
+        try:
+            return self._items[idx]
+        except ValueError:
+            return None
+
+    def delete(self, idx: int, count: int = 1) -> None:
+        del self._items[idx : idx + count]
+
+    def _render_impl(self) -> None:
+        assert self._pad
+        h, w = self.getmaxyx()
+        for y, item in enumerate(self._items):
+            self._pad.addnstr(y, 0, item, min(len(item), w))
+
+        y, x = self.getbegyx()
+        self._pad.refresh(self._scroll_y, 0, y, x, y + h - 1, x + w - 1)