[Chicago] wxpita

[Clint Laskowski]

I've started to play with wxPita a bit and it is very cool. Is there 
anything written up on it yet in terms of simple documentation?

How do I join the project or add to the wiki for it? I've started 
writing some notes and I'd be glad to add them as the start of 
documentation, if there is interest.

-- Clint

Feihong Hsu wrote:
> I'm not 100% sure I understand your question, but I'll take a stab at 
> an answer.
>
> The core of wxPita's API is the layout and event binding stuff. All 
> that happens outside of wxPython -- although the names of the classes 
> are the same, no widgets are being created when you're using that part 
> of the framework.
>
> Since the wxPita classes aren't real widgets, you can't treat them as 
> if they were. So I came up with two special ways to modify the state 
> of the GUI right after the widgets are initialized:
>
> - Fake methods
> - Init callbacks
>
> The fake methods just emulate simple method calls that you can make on 
> the real widgets. For example,
>
> f.combobox.SetSelection(0)
>
> Where f.combobox is a wrapper object for wx.ComboBox. This doesn't 
> execute anything, it just saves the name of the method and its 
> arguments for later, to be invoked right after the real widget is created.
>
> The Init callbacks look like this:
>
> @f.Init
> def _():
>     for s in ['cat', 'bat', 'dog', 'foo', 'box']:
>         f.combobox.Append(s)
>
>     # You can't use a Fake Method for this because wx.Font
>     # objects can't be instantiated until the wx.App object has been 
> created:
>     f.combobox.SetFont(wx.Font(14, wx.SWISS, wx.NORMAL, wx.NORMAL))
>
> The Init callback is invoked right after widget creation, but the 
> difference is that by that time, the wrapper objects have been 
> replaced by the real widgets. So, whereas f.combobox was a wrapper 
> before, inside the Init callback it's a real live wxPython widget. So 
> you can do anything inside the Init callback that you can normally do 
> in wxPython.
>
> Incidentally, I decided to do away with the Fake Method approach. It's 
> too magical and weird. I also changed the Init callback slightly from 
> how it was in yesterday's presentation (it doesn't accept a parameter 
> anymore, and it can only be used on container wrappers).
>
> The comments and questions I got were excellent; they really helped me 
> settle certain design decisions that were nagging me.  In particular, 
> the event binding API I devised with was quite ugly, but after fooling 
> around for a while I finally came up with something halfway decent:
>
> @f.button.button_clicked
> def onclick(evt):
>     print 'You clicked on', evt.EventObject.GetLabel()
>
> @f.combobox.combobox_selected
> def _(evt)
>     print 'You selected', evt.EventObject.GetSelectionString()
>
> f.button2.button_clicked.register(onclick)
>
> Again, I'm still using the wxPython names for everything, except now I 
> provide the option of using the event type IDs, which are generally 
> more descriptive than the the event binder names.
>
> I will see if I can upload everything to Google Code over the weekend. 
> The reason I didn't today was because I got sidetracked by data 
> binding, but I can't figure that out very quickly so I'll just check 
> in what I have now.
>
> Cheers,
> Feihong
>
> */sheila miguez <shekay at pobox.com>/* wrote:
>
>     Feihong's talk was fun. I did not hear all of the suggestion about
>     delegating things back to the wxWidgets. Could someone give a
>     synopsis?
>
>     -- 
>     sheila
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