[pygtk] Callbacks

[Walter Leibbrandt]

Hi,

Maybe I should just let some code do the talking. See attached script.

The button's "clicked" handler adds an "x" to the entry. The toggle 
button uses handler_(un)block_by_func() on addx_clicked so that it is 
only enabled if the toggle button is active. Note that 
handler_(un)block_by_func() was called on btn, seeing as that is the 
widget to which the handler is connected.

This is quite an exciting discovery for myself too. Seeing as its in 
GObject and not in Glade, I can use this with my custom widgets too and 
need not keep signal dictionaries anymore! :)

P.S. In this context "handler" means the function/method connected to a 
signal.

Peyman wrote:
> Hi Walter
>
> I am running into problems using it. To use 
> handler_bloc_by_func(callable) you have to pass callable: a callable 
> python object. I have tried using the widget itself, and it's callback 
> functions, but neither is working. What exactly do i have to pass as a 
> parameter. You made reference to passing the "handler" to it.
>
> Cheers
>
>
>
> Peyman Askari
>
> On 11 Mar 2009, at 12:53, Walter Leibbrandt wrote:
>
>> Hi,
>>
>> It seems that this has been asked before: 
>> http://osdir.com/ml/gnome.gtk+.python/2003-04/msg00089.html
>>
>> Short answer: no, it doesn't seem like you can. I have, however, 
>> found the handler_block_by_func() and handler_unblock_by_func() 
>> methods of gobject.GObject. Although I haven't tested this yet, it 
>> seems from the docs 
>> (http://library.gnome.org/devel/pygobject/stable/class-gobject.html#method-gobject--handler-block-by-func) 
>> that you can simply pass your handler to it to (un)block it from 
>> being called.
>>
>> Let me know how/if it works.
>>
>> HTH,
>>
>> Peyman wrote:
>>> I realize that once you call connect() it returns the handle_id. But 
>>> if glade is doing this for me, are the handle id's stored somewhere? 
>>> Surely there has to be a widget.get_handle_id('callback_function') 
>>> method. I can't seem to find anything on this over the net though.
>>
>> -- 
>> Walter Leibbrandt                  http://translate.org.za/blogs/walter
>> Software Developer                                  +27 12 460 1095 (w)
>> Translate.org.za
>>
>> Recent blogs:
>> * Firefox-style button with a pop-up menu
>> http://www.translate.org.za/blogs/walter/en/content/firefox-style-button-pop-menu 
>>
>> * Virtaal's MVCisation
>> * Things that changed the way I code
>>
>>
>

-- 
Walter Leibbrandt                  http://translate.org.za/blogs/walter
Software Developer                                  +27 12 460 1095 (w)
Translate.org.za

Recent blogs:
* Firefox-style button with a pop-up menu
http://www.translate.org.za/blogs/walter/en/content/firefox-style-button-pop-menu
* Virtaal's MVCisation
* Things that changed the way I code


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