from gi.repository import Gtk, Gio

class HeaderBarWindow(Gtk.Window):

def __init__(self):

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

self.set_border_width(10)

self.set_default_size(400, 200)

hb = Gtk.HeaderBar()

hb.props.show_close_button = True

hb.props.title = "HeaderBar example"

self.set_titlebar(hb)

button = Gtk.Button()

icon = Gio.ThemedIcon(name="mail-send-receive-symbolic")

image = Gtk.Image.new_from_gicon(icon, Gtk.IconSize.BUTTON)

button.add(image)

hb.pack_end(button)

box = Gtk.Box(orientation=Gtk.Orientation.HORIZONTAL)

Gtk.StyleContext.add_class(box.get_style_context(), "linked")

button = Gtk.Button()

button.add(Gtk.Arrow(Gtk.ArrowType.LEFT, Gtk.ShadowType.NONE))

box.add(button)

button = Gtk.Button()

button.add(Gtk.Arrow(Gtk.ArrowType.RIGHT, Gtk.ShadowType.NONE))

box.add(button)

hb.pack_start(box)

self.add(Gtk.TextView())

win = HeaderBarWindow()

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

win.show_all()

Gtk.main()