WListBox item selected? about picotui HOT 5 OPEN

class WListCheckbox(WListBox):
    def __init__(self, w, h, items):
        super().__init__(w, h, items)
        self.item_selected: List[bool] = [False for _ in items]
        self.prefix_selected = "[X] "
        self.prefix_unselected = "[ ] "

    def handle_key(self, key):
        res = super().handle_key(key)
        self.choice = self.cur_line
        if key == b" ":
            self.flip()

        self.redraw()
        self.signal("changed")
        return res

    def flip(self):
        """Flip the currently selected choice"""
        self.item_selected[self.choice] = not self.item_selected[self.choice]
        self.redraw()
        self.signal("changed")

    def show_line(self, l, i):
        is_selected = self.item_selected[i]

        # highlight current line
        hlite = self.cur_line == i
        if hlite:
            if self.focus:
                self.attr_color(C_B_WHITE, C_GREEN)
            else:
                self.attr_color(C_BLACK, C_GREEN)

        # differentiate between selected and unselected lines
        if i != -1:
            prefix = self.prefix_selected if is_selected else self.prefix_unselected
            l = prefix + l
            l = self.render_line(l)[: self.width]

            if is_selected and not hlite:
                self.attr_color(C_YELLOW)
            self.wr(l)
            self.attr_reset()

        self.clear_num_pos(self.width - len(l))
        if hlite:
            self.attr_reset()

    def handle_mouse(self, x, y):
        res = super().handle_mouse(x, y)
        self.choice = self.cur_line
        self.flip()
        self.redraw()
        self.signal("changed")
        return res