"Pushing" Data to Modules

[Donn Ingle]

Rich Shepard wrote:
>    I have no problems with the concept(s); I've used that model in C for
> years, even though it didn't have a name.

Oops. Sorry about that. I am totally new to it - I'm a spaghetti coder!

> I read further, it seemed that I had it backwards. Now, I'm not at all
> sure what's happening. Nor, why the messages are numbered rather than
> using strings; e.g., "file open."

Well, I reckon you're way beyond my little attempt. At the end, I include
some samples given to me (on this list) recently. Perhaps those will help
you more.

I used "ear" to indicate that it was going to listen and "shout" to indicate
that one wants something heard. To my mind they make sense :) So, yeah you
got them backwards.

I used descriptive variable names rather than strings because when I get
python errors, it shows the variables involved and I can see which 'topic'
is involved in the car smash. With strings, you don't get to see
what 'topic' was involved. Well, that's my story!
 
>    In the vast universe of working wxPython apps, there must be at least
>    one
> that uses these classes so we can learn how to use them for ourselves. No?

This is what I have been pointed to:
1.
http://lists.wxwidgets.org/cgi-bin/ezmlm-cgi?11:mss:48197:200602:okmajbebilmpeafpdlco
2. See attached samples by Werner F. Bruhin
He said "The post Dan pointed out looks very good.
There is also quit a bit of test code in the
pubsub.py module.  For what it is worth I attach the
very crude test stuff (run pubsubApp, press the 
button and close it, output goes to standard out)
I put together for myself to try to understand it."
3. There are two good articels on the wiki, neither
mention pubsub, but they may help you. I found them incomplete
as far as concept goes.
http://wiki.wxpython.org/index.cgi/ModelViewController 
http://wiki.wxpython.org/index.cgi/ModelViewPresenter


Good luck, 
Donn.
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# -*- coding: iso-8859-1 -*-#

"""Use it as follows:

    

    import mypublisher as mypub

    

    # to subscribe

    mypub.publisher.subscribe(functionToCall, mypub.statusText)

    

    # to notify

    mypub.publisher.sendMessage(mypub.statusText, _('Text for status line'))



"""

from wx.lib.pubsub import Publisher



# Define variables for valid pubsub stuff, one could use strings, but 

# I find this better as you get a clear failure if there is a problem, e.g. mistyped value

statusText              = 1 # pass status text in data section

dataNeedsSaving         = 2 # pass parent in data section to limit propagation, e.g. self.parent

comboBoxRefresh         = 3 # pass table name in data section, e.g. 'country_ls'

wineDetails             = 4 # pass ('refresh' | 'changed' | 'changedMulti' | 'added' | 'deleted', pkeys) in data section

bottleDetails           = 5 # pass ('changed' | 'added' | 'deleted', pkeys) in data section

vintageDetails          = 6 # pass ('changed' | 'added' | 'deleted', pkeys) in data section

consumptionDetails      = 7 # pass ('changed' | 'added' | 'deleted', pkeys) in data section

purchaseDetails         = 8 # pass ('changed' | 'added' | 'deleted', pkeys) in data section

setGetText              = 10

setGetTextLC            = 11

refreshWineFamily       = 12

politics                = 13



def SetDefaults():

    global publisher

    publisher = Publisher()

    # subscribe to everything just for test

    publisher.subscribe(MyPrint, '')



def MyPrint(msg):

    print '****************'

    print 'for testing only'

    print msg.topic

    print msg.data

    print '****************'



SetDefaults()
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