Python GTK+ 3如何仅弹出文件选择对话框？

Question

我正在尝试创建一个使用Gtk FileChooserDialog对话框的程序。我遵循了这里的教程，它能正常工作。但是，我只想弹出对话框而不必处理实际的Gtk窗口。

我尝试将教程中在on_file_clicked()函数中的代码提取出来并放入__init__函数中（稍加修改，使其看起来可以正常工作），并删除__init__中已有的代码：

class FileChooserWindow(Gtk.Window):

    def __init__(self):
        global path

        dialog = Gtk.FileChooserDialog("Please choose a file", self,
            Gtk.FileChooserAction.OPEN,
            (Gtk.STOCK_CANCEL, Gtk.ResponseType.CANCEL,
             Gtk.STOCK_OPEN, Gtk.ResponseType.OK))

        self.add_filters(dialog)

        response = dialog.run()
        if response == Gtk.ResponseType.OK:
            print("Open clicked")
            print("File selected: " + dialog.get_filename())
            path = dialog.get_filename()
            dialog.destroy()
        elif response == Gtk.ResponseType.CANCEL:
            print("Cancel clicked")
            dialog.destroy()

    def add_filters(self, dialog):
        filter_any = Gtk.FileFilter()
        filter_any.set_name("Any files")
        filter_any.add_pattern("*")
        dialog.add_filter(filter_any)

        filter_text = Gtk.FileFilter()
        filter_text.set_name('Text files')
        filter_text.add_mime_type('text/plain')
        dialog.add_filter(filter_text)

        filter_py = Gtk.FileFilter()
        filter_py.set_name('Python files')
        filter_py.add_mime_type('text/x-python')
        dialog.add_filter(filter_py)

        filter_img = Gtk.FileFilter()
        filter_img.set_name('Image')
        filter_img.add_mime_type('image/*')
        dialog.add_filter(filter_img)

win = FileChooserWindow()
win.connect("delete-event", Gtk.main_quit)
win.show_all()
Gtk.main()

但是它只返回这个错误：

Traceback (most recent call last):
  File "base.py", line 152, in <module>
    win = FileChooserWindow()
  File "base.py", line 38, in __init__
    Gtk.STOCK_OPEN, Gtk.ResponseType.OK))
  File "/usr/lib/python3/dist-packages/gi/overrides/__init__.py", line 175, in new_init
    return super_init_func(self, **new_kwargs)
  File "/usr/lib/python3/dist-packages/gi/overrides/Gtk.py", line 500, in __init__
    self._init(*args, **new_kwargs)
  File "/usr/lib/python3/dist-packages/gi/overrides/__init__.py", line 175, in new_init
    return super_init_func(self, **new_kwargs)
  File "/usr/lib/python3/dist-packages/gi/overrides/__init__.py", line 175, in new_init
    return super_init_func(self, **new_kwargs)
TypeError: could not convert value for property `transient_for' from FileChooserWindow to GtkWindow

有人知道如何正确地拉起仅 Gtk FileChooserDialog 对话框的方法吗？

- RPiAwesomeness

Answer 1

当你在第6行声明对话框时：

dialog = Gtk.FileChooserDialog("Please choose a file", self,  

self 是对话框的父级。要创建一个没有父级的对话框，请将其设置为 None，如下所示：

dialog = Gtk.FileChooserDialog("Please choose a file", None,

- Seth

Answer 2

@Seth的解决方案会导致以下错误崩溃：

Traceback (most recent call last):
  File "scriptname.py", line 57, in <module>
    win.connect("delete-event", Gtk.main_quit)
TypeError: object at 0x7ff81d5dedc0 of type FileChooserWindow is not initialized
CRITICAL: Exiting due to uncaught exception <class 'TypeError'>

我找到了一个更简单的PyGObject示例，并修复了一些错误以尝试让它工作，但它在主循环上阻塞并等待：

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

filechooserdialog = Gtk.FileChooserDialog(title="Open...",
             parent=None,
             action=Gtk.FileChooserAction.OPEN)
filechooserdialog.add_buttons("_Open", Gtk.ResponseType.OK)
filechooserdialog.add_buttons("_Cancel", Gtk.ResponseType.CANCEL)
filechooserdialog.set_default_response(Gtk.ResponseType.OK)

response = filechooserdialog.run()

if response == Gtk.ResponseType.OK:
    print("File selected: %s" % filechooserdialog.get_filename())

filechooserdialog.destroy()

- pangoSE