Open Kivy Popup Before Continuing

My kivy popup does not appear on the screen until the rest of the code in my method finishes running. I am trying to display a progress bar so it is worthless in it's current state

Solution 1:

This is based on member 'inclement's' answer. I am not 100% what you are attempting to do but here is some code I tested that kicks off a long-running task in its own thread and holds the popup open until that task completes.

Kivy .kv file entry

Button:text:"do..."on_release:app.root.info_popup(self)# your app may need root.info_popup(self)

In the app, the target method

definfo_popup(self, _button: Button):
    print(str(type(_button)))
    popup_content = ProgressBar(max=10)

    popup = Popup(title="Countdown",
                  size_hint=(None, None), size=(400, 180),
                  content=popup_content,
                  auto_dismiss=False)
    print("starting a new thread to do the countdown")
    threading.Thread(target=partial(self.update_progress, an_object=popup_content,
                                    the_popup=popup), daemon=True).start()
    popup.open()

which starts this function as its own thread

def update_progress(self, an_object, the_popup: Popup):
    for i in range(10, -1, -1):
        time.sleep(1.0)
        print("progress: {}".format(i))
        an_object.value = i
    the_popup.dismiss()
    print("I have dismissed the popup")

Solution 2:

I solved the issue by using the Clock.schedule_once() function to schedule my other threaded updates.