from gi.repository import Gtk

class StackWindow(Gtk.Window):

def __init__(self):

Gtk.Window.__init__(self, title="Stack Demo")

self.set_border_width(10)

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

self.add(vbox)

stack = Gtk.Stack()

stack.set_transition_type(Gtk.StackTransitionType.SLIDE_LEFT_RIGHT)

stack.set_transition_duration(1000)

checkbutton = Gtk.CheckButton("Click me!")

stack.add_titled(checkbutton, "check", "Check Button")

label = Gtk.Label()

label.set_markup("<big>A fancy label</big>")

stack.add_titled(label, "label", "A label")

stack_switcher = Gtk.StackSwitcher()

stack_switcher.set_stack(stack)

vbox.pack_start(stack_switcher, True, True, 0)

vbox.pack_start(stack, True, True, 0)

win = StackWindow()

win.connect("delete-event", Gtk.main_quit)

win.show_all()

Gtk.main()