import gi
gi.require_version("Gtk", "3.0")
from gi.repository import Gtk  # noqa


class App(Gtk.Window):

    def __init__(self):
        super().__init__()
        self.tip = self.tip_win = self.tip_lbl = None
        self.all = False
        self.set_size_request(250, 200)
        self.set_tooltip_text('Hi')
        self.connect("destroy", Gtk.main_quit)
        self.connect("query-tooltip", self._tip_cb)

        fixed = Gtk.Fixed()
        self.add(fixed)
        button = Gtk.Button("Button")
        button.set_size_request(80, 35)
        fixed.put(button, 50, 50)
        button.connect("clicked", self._show_tip)

        self.show_all()

    def _tip_cb(self, top_win, x, y, xt, tip):
        if self.tip_win is None:
            top_win.set_property("has-tooltip", False)
            self.tip = tip
            self.tip_lbl = Gtk.Label("Top window tip")
            self.tip.set_custom(self.tip_lbl)
            self.tip_win = self.tip_lbl.get_toplevel()
        return False

    def _show_tip(self, _):
        if self.tip is None:
            return
        self.tip.set_custom(self.tip_lbl)
        if self.all:
            self.tip_win.show_all()
        else:
            self.tip_win.show()
        self.all = not self.all

if __name__ == "__main__":
    pyapp = App()
    Gtk.main()