I can't find an issue with my code, please help me debug... can't describe any better sorry

Python Help
,
1

Hi, I have this bit of code that is supposed to open the directory selector for the user to go to a directory and… select it. The code itself works on Linux only, and was given to me on r/learnpython.
The code - which is working by itself - :

import gi


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


dialog = Gtk.FileChooserDialog(
    title="Select folder", parent=None, action=Gtk.FileChooserAction.SELECT_FOLDER
)
dialog.add_button("Cancel", Gtk.ResponseType.CANCEL)
dialog.add_button("Select", Gtk.ResponseType.OK)


response = dialog.run()
if response == Gtk.ResponseType.OK:
    directory = dialog.get_filename()
    print(directory)
dialog.destroy()

But when I put it in my actual app’s code, then it doesn’t work. The window opens, but clicking “select” will make the app freeze completely.

here is my code, in which I implemented the gtk code that was given to me.

import flet as ft
from flet_route import Params, Basket
import subprocess
import gi


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


def parameters(page: ft.Page, params: Params, basket: Basket):


    def select_folder(self):
        dialog = Gtk.FileChooserDialog(
            title="Select folder", parent=None, action=Gtk.FileChooserAction.SELECT_FOLDER
        )
        dialog.add_button("Cancel", Gtk.ResponseType.CANCEL)
        dialog.add_button("Select", Gtk.ResponseType.OK)


        response = dialog.run()
        if response == Gtk.ResponseType.OK:
            directory = dialog.get_filename()


        dialog.destroy()



    return ft.View(
        "/parameters/",
        controls=[
            ft.Row(
                controls=[
                    ft.IconButton(
                        icon=ft.icons.ARROW_BACK,
                        icon_size=20,
                        on_click=lambda _: page.go("/")
                    )
                ],
                alignment=ft.MainAxisAlignment.START
            ),
            ft.Container(  # Conteneur qui centre la colonne
                content=ft.Column(
                    controls=[
                        ft.ElevatedButton(
                            "Sélectionner un répertoire",
                            on_click=select_folder
                        ),
                    ],
                    alignment=ft.MainAxisAlignment.CENTER,
                    horizontal_alignment=ft.CrossAxisAlignment.CENTER
                ),
                alignment=ft.alignment.center,  # Centre tout le contenu
                expand=True  # Fait en sorte que le container prenne tout l'espace
            )
        ],
        vertical_alignment=ft.MainAxisAlignment.CENTER  # Centre tout le contenu verticalement
    )

Could someone help me debug please ? I really tried but I can’t find what the issue is. It’s my first time really trying coding, please be indulgent to possible obvious mistakes !

2

I am not a Gtk user so I do not know if your code is missing something, like an event loop.

I yout place I would have a look at the tutorial documentation.
Which is here The Python GTK+ 3 Tutorial — Python GTK+ 3 Tutorial 3.4 documentation

1 Like
3

The reason your app freezes after clicking “Select” is because Gtk.FileChooserDialog.run() is a blocking function. It stops the flow of your app and waits for the user to interact. That works fine in a simple script, but not in a GUI framework like Flet, which is async and expects non-blocking callbacks.

I don’t know of a simple way to fix this. Flet is meant to create desktop and web apps, so it doesn’t have a directory selector dialogue. However, you might want to look into Flet’s FilePicker widget?

4

Yes thanks, that’s what I’ll be doing. It’s more buggy than the gtk method, but I’ve learned that mixing flet and gtk is not a good idea !