SettingsWidgets.py 文件源码

def on_button_pressed(self, widget):
        dialog = Gtk.FileChooserDialog(title=_("Choose an Image File"),
                                       action=Gtk.FileChooserAction.OPEN,
                                       transient_for=self.get_toplevel(),
                                       buttons=(_("_Cancel"), Gtk.ResponseType.CANCEL,
                                                _("_Open"), Gtk.ResponseType.OK))

        filter_text = Gtk.FileFilter()
        filter_text.set_name(_("Image files"))
        filter_text.add_mime_type("image/*")
        dialog.add_filter(filter_text)

        backgrounds = "/usr/share/backgrounds"

        if os.path.exists(self.value):
            dialog.set_filename(self.value)

        if os.path.exists(backgrounds):
            dialog.add_shortcut_folder(backgrounds)

        box = Gtk.Box(orientation=Gtk.Orientation.VERTICAL)
        self.frame = Gtk.Frame(visible=False, no_show_all=True)
        preview = Gtk.Image(visible=True)

        box.pack_start(self.frame, False, False, 0)
        self.frame.add(preview)
        dialog.set_preview_widget(box)
        dialog.set_preview_widget_active(True)
        dialog.set_use_preview_label(False)

        box.set_margin_end(12)
        box.set_margin_top(12)
        box.set_size_request(320, -1)

        dialog.connect("update-preview", self.update_icon_preview_cb, preview)

        response = dialog.run()

        if response == Gtk.ResponseType.OK:
            filename = dialog.get_filename()
            self.bind_object.set_text(filename)

        dialog.destroy()