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from __future__ import annotations
import urwid
def menu_button(caption, callback):
button = urwid.Button(caption)
urwid.connect_signal(button, 'click', callback)
return urwid.AttrMap(button, None, focus_map='reversed')
def sub_menu(caption, choices):
contents = menu(caption, choices)
def open_menu(button):
return top.open_box(contents)
return menu_button([caption, '...'], open_menu)
def menu(title, choices):
body = [urwid.Text(title), urwid.Divider()]
body.extend(choices)
return urwid.ListBox(urwid.SimpleFocusListWalker(body))
def item_chosen(button):
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):
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):
super().__init__(urwid.SolidFill('/'))
self.box_level = 0
self.open_box(box)
def open_box(self, box):
self.original_widget = urwid.Overlay(urwid.LineBox(box),
self.original_widget,
align='center', width=('relative', 80),
valign='middle', height=('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):
if key == 'esc' and self.box_level > 1:
self.original_widget = self.original_widget[0]
self.box_level -= 1
else:
return super().keypress(size, key)
top = CascadingBoxes(menu_top)
urwid.MainLoop(top, palette=[('reversed', 'standout', '')]).run()
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