On Thursday, July 18, 2013 1:38:34 AM UTC+8, Dave Angel wrote:
> On 07/17/2013 09:18 AM, fronag...@gmail.com wrote:
> > On Wednesday, July 17, 2013 7:42:45 PM UTC+8, Dave Angel wrote:
> >> On 07/17/2013 07:10 AM, fronag...@gmail.com wrote:
> >>> On Wednesday, July 17, 2013 6:07:22 PM UTC+8, Dave Angel wrote:
> >>>> On 07/16/2013 11:04 PM, fronag...@gmail.com wrote:
> >>>>> Noted on the quoting thing.
> >>>>> Regarding the threading, well, first, I'm not so much a programmer as
> >>>>> someone who knows a bit of how to program.
> >>>>> And it seems that the only way to update a tkinter window is to use the
> >>>>> .update() method, which is what I was experimenting with. Start up a
> >>>>> new thread that just loops the .update() with a 1ms sleep until the
> >>>>> download is done. It seems to work, actually.
> >>>> update() is to be used when it's too awkward to return to mainloop. In
> >>>> my second approach, you would periodically call it inside the processing
> >>>> loop. But unless tkinter is unique among GUI's, it's unsafe to do that
> >>>> in any thread besides the GUI thread.
> >>>> DaveA
>
> >>> Yes, based on advice from this thread, I'm doing that. From my main
> >>> thread, I create a thread that handles the download while updating a
> >>> variable that the mainloop displays as a text output, and in that
> >>> mainloop, I have a while loop that updates the GUI until the downloading
> >>> is done.
> >> I can't figure out what you're really doing, since each message from you
> >> says something different. You don't need a separate while loop, since
> >> that's exactly what app.mainloop() is.
> >> --
> >>
> >> DaveA
> >
> > Hm. My apologies for not being very clear. What I'm doing is this:
> > self.loader_thread = Thread(target=self.loadpages,
> > name="loader_thread")
> > self.loader_thread.start()
> > while self.loader_thread.isAlive():
> > self.root_window.update()
> > sleep(0.05)
> > Where loadpages is a function defined elsewhere.
>
> Presumably this fragment is from a method of some class you've written.
> Is it an event handler, or is this happening before you finish setting
> up the GUI? Somewhere at top-level, you're supposed to fall into a call
> to mainloop(), which doesn't return till the user cancels the app.
> --
>
> DaveA
This is, indeed, an event handler from a class for my GUI. My entire GUI is a
bit large, so I'll not copy the entire thing here, but it roughly goes:
class GUI(object):
def __init__(self):
[stuff]
def init_button(self):
self.execute = ttk.Button(self.input_frame, text='Tally',
command=self.execute_now)
self.execute.grid(column=1, row=2, sticky=(N, S, E, W), columnspan=4)
def execute_now(self):
[stuff]
self.loader_thread = Thread(target=self.loadpages,
name="loader_thread")
self.loader_thread.start()
while self.loader_thread.isAlive():
self.root_window.update()
sleep(0.05)
[morestuff]
if __name__ == "__main__":
APP = GUI()
APP.root_window.mainloop()
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