import tkinter as tk


class UserListView:
    """
    Виджет списка пользователей.
    """

    def __init__(self, master):
        self.frame = tk.Frame(master)
        self._listbox = tk.Listbox(self.frame, width=40)
        self._listbox.pack(padx=10, pady=10)

    def set_items(self, items: list[str]) -> None:
        self._listbox.delete(0, tk.END)
        for it in items:
            self._listbox.insert(tk.END, it)

    def get_selected(self) -> str | None:
        sel = self._listbox.curselection()
        return self._listbox.get(sel[0]) if sel else None