ui+roster: implement removing players

pqcli/ui/confirm_dialog.py

@@ -0,0 +1,43 @@
+import typing as T
+
+import urwid
+
+from pqcli.ui.button import MenuButton
+
+
+class ConfirmDialog(urwid.Overlay):
+    signals = ["confirm", "cancel"]
+
+    def __init__(self, label: str, parent: urwid.Widget) -> None:
+        question = urwid.Text(("bold", label), "center")
+        yes_btn = MenuButton(
+            "Yes", hint="Y", on_press=lambda _user_data: self.confirm()
+        )
+        no_btn = MenuButton(
+            "No", hint="N", on_press=lambda _user_data: self.cancel()
+        )
+
+        line_box = urwid.LineBox(
+            urwid.ListBox(
+                urwid.SimpleFocusListWalker([question, no_btn, yes_btn])
+            )
+        )
+
+        super().__init__(
+            line_box, parent, "center", len(label) + 6, "middle", 5
+        )
+
+    def keypress(self, size: T.Any, key: str) -> T.Optional[str]:
+        if key in {"y", "Y"}:
+            self.confirm()
+            return None
+        if key in {"n", "N"}:
+            self.cancel()
+            return None
+        return T.cast(T.Optional[str], super().keypress(size, key))
+
+    def confirm(self) -> None:
+        self._emit("confirm")
+
+    def cancel(self) -> None:
+        self._emit("cancel")