Re: [Pyobjc-dev] PyObjC and bindings

[John S. <jo...@sk...>]

Hi Ronald,

Thanks for the response. I had declared class properties as you  
listed, but I had also written the accessors in a way that would  
collide in Python. Since I'm using bindings, I guess I only need to  
declare the properties and let the bindings do the magic.  	

The second error occurred because I didn't connect the arrayController  
to the ApplicationDelegate in Interface Builder. Once I did that,  
everything was fine.

Cheers,

John

On Jan 22, 2008, at 9:41 AM, Ronald Oussoren wrote:

> John,
>
> Could you post the code, that would make discussion easier.
>
> The first error you're getting is probably because you do something  
> like this:
>
>     def setFoo_(self, value):
>          self.foo = value
>
>
>      def foo(self):
>           return self.foo
>
>
> That works in Objective-C, but no in python, the method foo and the  
> instance variable foo live in the same namespace in Python (more or  
> less, reality is slightly more complex than that).
>
> The non-accessor version probably needs a property definition:
>
>     class FileModel (NSObject):
>         foo = objc.ivar()
>
> Ronald
>
>
> On 22 Jan, 2008, at 0:08, John Skidgel wrote:
>
>> Hi All,
>>
>> Forgive me but I'm new to PyObjC.
>>
>> I'm trying to add a directory path to an NSTableView programatically.
>>
>> In Interface builder, I have an NSTableView with columns bound to an
>> NSArrayController. It's called arrayController and it's class name is
>> FileModel, which is a Python class in my XCode project.
>> ArrayController has fileName, and fileLocation as keys. FileModel.py
>> has instance variables for both of these.
>>
>> Below the table, I have an Add and a Remove button. The Add button
>> displays an Open panel as a sheet. Upon selecting a file and clicking
>> OK, a method named, didEndSheet_returnCode_contextInfo_ creates a
>> FileModel object, myFile and uses sheet.filename() to set  
>> fileLocation
>> and sheet.filename().lastPathComponent() to set fileName. I can use
>> NSLog and successfully trace these attributes. Where the program  
>> fails
>> is in adding this myFile instance to arrayController instance.
>>
>> The current flow is:
>> 1 The user launches the application
>> 2 The user clicks Add button
>> 3 The application displays a File Open panel as a sheet
>> 4 The user browses to a file and selects it
>> 5 The user clicks open
>> 6 Error occurs
>>
>> I've added accessor methods for the FileModel class and I get this
>> error at step 6:
>>
>> (TypeError: cannot change a method)
>>
>> If I remove the accessor methods, I get the following error dialog in
>> step 6:
>>
>> (AttributeError: 'NoneType' object has no attribute 'addObject_')
>>
>> I've read a few tutorials on bindings but I'm still fuzzy on whether
>> there's a disconnect between the NSArrayController in the Nib file  
>> and
>> code in the delegate or if it's a type conversion problem.
>>
>> Any ideas?
>>
>> Cheers,
>>
>> John
>>
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