CODEWITHSUNDEEP
pythonpython-3.xtimetkinter
Radagast
Radagast

Reputation: 509

time.sleep() Equivalent on Tkinter

I have to stop a loop and resume after many seconds. I tried to use after(), but the loop don't freeze. And when I use time.sleep() (works out tkinter), tkinter freeze. Have another way or a function equivalent time.sleep() without freeze.

code:

for message in listOfMessages:
    time.sleep(message.time)
    #manipulate message
    #change text widget

This will freeze my tkinter app.

I tried to use after() but message.time is a float: 0.5054564 to 1.5234244. It's random. And after supports only int. I can't convert to int, because low numbers make differents. And if i convert 0.52342342 in int: 523... i lost the others 42342

and this dont work too:

def changes(#values):
    #manipulate message
    #change text widget

for message in listOfMessages:
    app.after(message.time, lambda: changes(#values))

Have another function equivalent time.sleep thats not freeze tkinter and is different that after()? If not, have another way to do this? Thanks for attention.

Upvotes: 2

Views: 2186

Answers (1)

jfs
jfs

Reputation: 414825

To create an analog of:

for message in listOfMessages:
    time.sleep(message.time)
    change(message)

in tkinter:

def update_widget(app, messages):
    message = next(messages, None)
    if message is None: # end of the loop
        return
    delay = int(message.time * 1000) # milliseconds
    app.after(delay, change, message) # execute body
    app.after(delay, update_widget, app, messages) # next iteration

update_widget(app, iter(listOfMessages))

If you want to wait until change(message) finishes before continuing the loop:

def iterate(message, app, messages):
    change(message)
    update_widget(app, messages)

def update_widget(app, messages):
    message = next(messages, None)
    if message is None: # end of the loop
        return
    delay = int(message.time * 1000) # milliseconds
    app.after(delay, iterate, message, app, messages)

update_widget(app, iter(listOfMessages))

Upvotes: 3

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