更改小部件鼠标悬停时的光标(PyGObject)

import gi
gi.require_version('Gtk', '3.0')
from gi.repository import Gtk, Gdk

class MyWindow(Gtk.Window):
    def __init__(self):
        Gtk.Window.__init__(self, title="Cursor Example")
        self.set_default_size(200, 200)

        button = Gtk.Button.new_with_label("Hover Me")
        button.connect("enter-notify-event", self.on_button_hover)

        box = Gtk.Box(orientation=Gtk.Orientation.VERTICAL, spacing=6)
        box.pack_start(button, True, True, 0)
        self.add(box)

    def on_button_hover(self, widget, event):
        cursor = Gdk.Cursor.new(Gdk.CursorType.HAND2)
        widget.get_window().set_cursor(cursor)

win = MyWindow()
win.connect("destroy", Gtk.main_quit)
win.show_all()
Gtk.main()