[Question] About threading/background tasks/live graphs

[mpikmwm]

Question

Hey,
I've been playing around with flet and I mainly intent to build apps, that monitor sensors or readout some data and then visualise the data on the app. Idealy live in combination with matplot lib.

For my readout routine I've been useing threads and I've seen the asyncio secition on the deocumentation.
There's stated, that threading isn't the best option with flet...

So my question is, if I code my app like this, with threading, it's not the ideal way (I'm not familiar with asyncio)?

And can matplotlib plots be rendered live (not as image), with the NavigationToolbar etc?

Code sample

import flet as ft
from threading import Thread,Event

class MyThread(Thread):
    threadTime = 1
    update = False
    counter = 0
    def __init__(self, event):
        Thread.__init__(self)
        self.stopped = event

    def run(self):
        while not self.stopped.wait(self.threadTime):
            self.counter += 1
            print(self.counter)
            self.update = True

def main(page: ft.Page):
    t = ft.Text(value="Hello, world!", color="green")
    number = ft.Text(value=0, color="red")
    page.controls.append(t)
    page.controls.append(number)
    page.update()
    while(True):
        if counting_thread.update == True:
            counting_thread.update = False
            number.value = number.value+1
            page.update()

stopFlag = Event()
counting_thread = MyThread(stopFlag)
counting_thread.start()
ft.app(target=main)

Error message

No response

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• I have searched for answers to my question both in the issues and in previous discussions.

[gbrandt]

There is nothing wrong with using threads when waiting for input from an external source (Database or Device). If it's working for you just go ahead and do it.

In my app I have a minimum of 3 threads running at a time with no problems (maximum 6)