[pygtk] Callbacks

[Timo]

Peyman schreef:
> Hi, a while back I inquired about blocking signals, and we came to the  
> conclusion that via glade there is no way to get a hold of the handler  
> IDs, so we had to use handler_block_by_func(). At the time  
> handler_block_by_func() didn't even work for me under python. I have  
> switched over to C, and handler_block_by_func() finally works.  
> Unfortunately, handler_unblock_by_func() does not work. I don't know  
> if this is because it is corrupted, or b/c I am using it incorrectly.  
> Quite frankly, I'm starting to lose my patience since there is very  
> little help on the internet wrt blocking functions.
>   
I'm using Glade too, and to block a function I use the following.


def checkbox_toggled(self, widget):
    if self.blockCheckboxCallback: return

    print "Checkbox toggled"
    # More code


self.blockCheckboxCallback = True
# Do your thing here
self.blockCheckboxCallback = False

> I also can't seem to find a way to autoconnect signals AND save their  
> handler IDs. This would seem like a very important option.
>
> It's getting to the point where I might start using brute force, and  
> connecting every signal manually, but I hope someone informs me of an  
> easier approach
>
> Thank You
>
>
> Peyman Askari
>
> On 11 Mar 2009, at 13:31, Walter Leibbrandt wrote:
>
>   
>> 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
>>
>>
>> #!/usr/bin/env python
>>
>> import gtk
>> import gtk.glade
>>
>> xml = gtk.glade.XML('gui.glade')
>> win = xml.get_widget('window')
>> btn = xml.get_widget('button')
>> entry = xml.get_widget('entry')
>>
>> def addx_clicked(*args):
>>    entry.props.text += 'x'
>>
>> def enable_toggled(togglebtn):
>>    if togglebtn.get_active():
>>        btn.handler_unblock_by_func(addx_clicked)
>>    else:
>>        btn.handler_block_by_func(addx_clicked)
>>
>> win.connect('destroy', lambda *args: gtk.main_quit())
>> btn.connect('clicked', addx_clicked)
>> xml.get_widget('togglebutton').connect('toggled', enable_toggled)
>>
>> win.show_all()
>> gtk.main()
>> <gui.glade>
>>     
>
> _______________________________________________
> pygtk mailing list   pygtk at daa.com.au
> http://www.daa.com.au/mailman/listinfo/pygtk
> Read the PyGTK FAQ: http://faq.pygtk.org/
>