Re: [Jython-users] how to catch dispose events of swing widgets

[Alex G. <ale...@ne...>]

Fabrizio Pollastri kirjoitti:
> Alex Grönholm wrote:
>   
>> Fabrizio Pollastri kirjoitti:
>>     
>>> Alex Grönholm wrote:
>>>       
>>>> Fabrizio Pollastri kirjoitti:
>>>>         
>>>>> Hi all,
>>>>> when the gui of my application is closed or when the application 
>>>>> destroys (intentionally) part of the gui, I need to catch this event 
>>>>> for each involved widget. Any suggestion is welcome. Thanks in advance.
>>>>>
>>>>>   
>>>>>           
>>>> What for? Also, I don't think any dispose events are sent, but you 
>>>> can catch events generated from removing those widgets from their 
>>>> parent container.
>>>> Would that be good enough?
>>>>         
>>> I have tried this:
>>>
>>> widget.addContainerListener(ContainerListener(my_destroy_manager_function)) 
>>>
>>> ....
>>> class ContainerListener(awt.event.ContainerListener):
>>>   "Call my widget destroy handler"
>>>
>>>   def __init__(self,my_destroy_manager):
>>>     self.my_destroy_manager = my_destroy_manager
>>>
>>>   def componentRemoved(self,*args):
>>>     self.my_destroy_manager()
>>>
>>> But nor the closing by mouse clicking, nor the widget dispose method 
>>> trigger my_destroy_manager function.
>>>
>>>       
>> Because in neither case is your component actually removed from its 
>> parent container. Please explain why you need to do this in the first 
>> place so we may help you.
>>     
>
> I am porting AVC (http://avc.inrim.it) to java swing using jython.
>
> In brief, AVC is a python module that connects values displayed by 
> widgets to values held by application variables. The connection is done 
> automatically matching names assigned to widgets with variable names.
>   
Sounds just like what I've been doing with the binding module in 
jython-swingutils (http://bitbucket.org/agronholm/jython-swingutils/).
Why don't you take a look and see if it's anything like AVC?
> When a widget controlled by AVC is destroyed, AVC needs to remove it 
> from its internal data structures. So I am looking for the right signal 
> to do this when I close the main window or the program delete same 
> widgets from the gui.
>   
It is relatively rare for widgets to actually get removed from their 
parent container in Swing applications. Are these internal data 
structures persistent? If not, I see no point in removing the variables 
from them on application exit. If they are, you could just listen for 
the parent window's windowClosed event.
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