import gi

gi.require_version("Gtk", "3.0")

from gi.repository import Gtk

class ExpanderExample(Gtk.Window):

def __init__(self):

super().__init__(title="Expander Demo")

self.set_size_request(350, 100)

vbox = Gtk.Box(orientation=Gtk.Orientation.VERTICAL, spacing=6)

self.add(vbox)

text_expander = Gtk.Expander(

label="This expander displays additional information"

)

text_expander.set_expanded(True)

vbox.add(text_expander)

msg = """

This message is quite long, complicated even:

- It has a list with a sublist:

- of 3 elements;

- taking several lines;

- with indentation.

"""

details = Gtk.Label(label=msg)

text_expander.add(details)

widget_expander = Gtk.Expander(label="Expand for more controls")

vbox.add(widget_expander)

expander_hbox = Gtk.HBox()

widget_expander.add(expander_hbox)

expander_hbox.add(Gtk.Label(label="Text message"))

expander_hbox.add(Gtk.Button(label="Click me"))

self.show_all()

win = ExpanderExample()

win.connect("destroy", Gtk.main_quit)

win.show_all()

Gtk.main()