How to cancel a background task

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5

After testing for a night, I find out the solution.

def task_function(arg):
    cancel_flag == False

    main loop:
        if cancel_flag:
            break

...
...
...
     
        def set_cancel_flag():
            nonlocal cancel_flag
            cancel_flag = True

        mw.taskman.run_on_main(lambda: set_cancel_flag() if mw.progress.want_cancel() else None)

Edited: Thanks to @dae, I refined the code:


def task(arg):
    mw.taskman.run_in_background(lambda: task_function(arg))

def task_function(arg):
...
...
...

    main loop:
...
...
...

        if mw.progress.want_cancel()
            break
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