Please note, it is a fatal bug! In versions 0.12.2 and 0.17.0 (and maybe all versions 0.12.2 to 0.17.0) when using did_mount, the window cannot be opened again after being minimized

[gpt9796]

Please note, it is a fatal bug! In versions 0.12.2 and 0.17.0 (and maybe all versions 0.12.2 to 0.17.0) when using did_mount, the window cannot be opened again after being minimized. But there is no such bug in versions 0.12.1 and below.

Code example to reproduce the issue:

import flet as ft
import time, threading

class Countdown(ft.UserControl):
    def __init__(self, seconds):
        super().__init__()
        self.seconds = seconds

    def did_mount(self):
        self.running = True
        self.th = threading.Thread(target=self.update_timer, args=(), daemon=True)
        self.th.start()

    def will_unmount(self):
        self.running = False

    def update_timer(self):
        while self.seconds and self.running:
            mins, secs = divmod(self.seconds, 60)
            self.countdown.value = "{:02d}:{:02d}".format(mins, secs)
            self.update()
            time.sleep(1)
            self.seconds -= 1

    def build(self):
        self.countdown = ft.Text()
        return self.countdown

def main(page: ft.Page):
    page.add(Countdown(120), Countdown(60))

ft.app(target=main)

Describe the results you received:

Describe the results you expected:

Additional information you deem important (e.g. issue happens only occasionally):

Flet version (pip show flet):

Name: flet
Version: 0.12.2
Summary: Flet for Python - easily build interactive multi-platform apps in Python
Home-page:
Author: Appveyor Systems Inc.
Author-email: [email protected]
License: Apache-2.0
Location: d:\b\code\python\novamss\venv-cpu\lib\site-packages
Requires: cookiecutter, flet-runtime, packaging, qrcode, watchdog, websocket-client, websockets
Required-by:

Operating system: Windows

Additional environment details:

[kacper-the-programmer]

unfortunately, this bug also applies to "clean" flet window, someone on discord mentioned this bug but unfortunately this error affects only a few people ( including me )

[gpt9796]

unfortunately, this bug also applies to "clean" flet window, someone on discord mentioned this bug but unfortunately this error affects only a few people ( including me )

However, this bug is likely to affect all versions from 0.12.2 to 0.17.0. I think this is a very serious problem and I hope the author can pay attention to it. Because of this problem, I had to roll back from 0.17.0 to version 0.12.1

[kacper-the-programmer]

so maybe you could write about this bug on discord, maybe one of devs will fix it if you mention it again

[fanxing2022]

I also happend this trouble

[gpt9796]

so maybe you could write about this bug on discord, maybe one of devs will fix it if you mention it again

I have already written once on discard, but no one responded. I will continue to write.

[gpt9796]

I also happend this trouble

It seems that many people have encountered this problem

[kacper-the-programmer]

The only thing I know about this bug is that this bug is random ( sometimes it happens and sometimes it doesn't ) and that it only affects windows users

[gpt9796]

The only thing I know about this bug is that this bug is random ( sometimes it happens and sometimes it doesn't ) and that it only affects windows users

The above code is directly copied from the flet document. this bug is always appear in my env.

[Jorge-lopz]

Any updates on this issue? @FeodorFitsner It happens more and more frequently to me now.

[gpt9796]

Any updates on this issue? @FeodorFitsner It happens more and more frequently to me now.

@FeodorFitsner Hi, Are you hava any idea of this bug? Looking forward to your reply！Thanks