Idle thread (Polling) python GUI and saving program state
python at mrabarnett.plus.com
Tue Mar 4 14:19:54 CET 2014
On 2014-03-04 02:41, Rolando wrote:> On Monday, March 3, 2014 6:06:22 PM
UTC-8, MRAB wrote:
>> On 2014-03-04 01:33, Rolando wrote:
>> > I have a GUI with a bunch of cells which is my "View" in the MVC
>> > design. The user enters some information in the view and I pass
>> > this on to the model so that using the information entered by
>> > the user it(model) can do some processing.
>> > I have coded up my model as a state machine. Wherein, once a
>> > function is complete it switches to the next state and so on.
>> > I want to know how do I save the program state between restarts.
>> > Basically, I'm trying to handle a scenario wherein if someone
>> > closes the program. The next time someone starts it up, it
>> > should start from where it left off (both the view and model)
>> When the user closes the window (you don't say what you're using for
>> the GUI, but there should be a way of detecting when window closes),
>> save the necessary info to a file using, say, the 'json' module. You
>> can then reload the info from the file when the program is
>> > Also, I want to setup a poll method where once in a while I can
>> > poll each cell to know the state it is in. How do I do this? I
>> > don't want my GUI to hang when I'm doing anything. It will be
>> > great if someone could help. Thanks!
>> Can the model run continuously? If so, you should run it in its own
>> (background) thread and the GUI in the main thread and communicate
>> with the model's thread via, say, a queue (for that use the 'queue'
> I'm using wxPython for my GUI. I have tried running the model thread
in the background. But how will I save the state if the whole model is
running on a thread? When the program is restarted I want the program to
continue from the same state where it left off for each cell. I was
thinking of having an idle thread that calls a poll method which polls
all the cells and checks what each one is doing. But, I don't know how
to do that. I'm confused.
Please read this:
because Gmail is formatting your email badly, making it harder to read.
When the front-end wants to quit, it tells the back-end and then waits
for it to terminate before itself quitting.
When the back-end receives the message that it should quit, it saves
its state and terminates.
When the front-end starts up again, it starts the back-end.
When the back-end starts, it load the state and runs.
More information about the Python-list