Python GTK3+使用按钮加载图片

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

window = Gtk.Window(title="加载图片示例")
window.connect("destroy", Gtk.main_quit)

button = Gtk.Button(label="点击加载图片")

image = Gtk.Image()

file_chooser = Gtk.FileChooserDialog(
    title="选择要加载的图片",
    parent=window,
    action=Gtk.FileChooserAction.OPEN
)
file_chooser.add_buttons(
    Gtk.STOCK_CANCEL,
    Gtk.ResponseType.CANCEL,
    Gtk.STOCK_OPEN,
    Gtk.ResponseType.OK
)

def on_button_clicked(widget):
    response = file_chooser.run()
    if response == Gtk.ResponseType.OK:
        file_path = file_chooser.get_filename()
        image.set_from_file(file_path)
    file_chooser.hide()

button.connect("clicked", on_button_clicked)

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

Gtk.main()