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from __future__ import annotations
import typing
import urwid
if typing.TYPE_CHECKING:
from collections.abc import Callable, Hashable, Iterable
def menu_button(
caption: str | tuple[Hashable, str] | list[str | tuple[Hashable, str]],
callback: Callable[[urwid.Button], typing.Any],
) -> urwid.AttrMap:
button = urwid.Button(caption, on_press=callback)
return urwid.AttrMap(button, None, focus_map="reversed")
def sub_menu(
caption: str | tuple[Hashable, str] | list[str | tuple[Hashable, str]],
choices: Iterable[urwid.Widget],
) -> urwid.Widget:
contents = menu(caption, choices)
def open_menu(button: urwid.Button) -> None:
return top.open_box(contents)
return menu_button([caption, "..."], open_menu)
def menu(
title: str | tuple[Hashable, str] | list[str | tuple[Hashable, str]],
choices: Iterable[urwid.Widget],
) -> urwid.ListBox:
body = [urwid.Text(title), urwid.Divider(), *choices]
return urwid.ListBox(urwid.SimpleFocusListWalker(body))
def item_chosen(button: urwid.Button) -> None:
response = urwid.Text(["You chose ", button.label, "\n"])
done = menu_button("Ok", exit_program)
top.open_box(urwid.Filler(urwid.Pile([response, done])))
def exit_program(button: urwid.Button) -> typing.NoReturn:
raise urwid.ExitMainLoop()
menu_top = menu(
"Main Menu",
[
sub_menu(
"Applications",
[
sub_menu(
"Accessories",
[
menu_button("Text Editor", item_chosen),
menu_button("Terminal", item_chosen),
],
),
],
),
sub_menu(
"System",
[
sub_menu(
"Preferences",
[menu_button("Appearance", item_chosen)],
),
menu_button("Lock Screen", item_chosen),
],
),
],
)
class CascadingBoxes(urwid.WidgetPlaceholder):
max_box_levels = 4
def __init__(self, box: urwid.Widget) -> None:
super().__init__(urwid.SolidFill("/"))
self.box_level = 0
self.open_box(box)
def open_box(self, box: urwid.Widget) -> None:
self.original_widget = urwid.Overlay(
urwid.LineBox(box),
self.original_widget,
align=urwid.CENTER,
width=(urwid.RELATIVE, 80),
valign=urwid.MIDDLE,
height=(urwid.RELATIVE, 80),
min_width=24,
min_height=8,
left=self.box_level * 3,
right=(self.max_box_levels - self.box_level - 1) * 3,
top=self.box_level * 2,
bottom=(self.max_box_levels - self.box_level - 1) * 2,
)
self.box_level += 1
def keypress(self, size, key: str) -> str | None:
if key == "esc" and self.box_level > 1:
self.original_widget = self.original_widget[0]
self.box_level -= 1
return None
return super().keypress(size, key)
top = CascadingBoxes(menu_top)
urwid.MainLoop(top, palette=[("reversed", "standout", "")]).run()
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