Re: Custom field editors

FROM : John Stiles
DATE : Fri Jan 04 21:02:01 2008

Cool, thanks for filing it on my behalf :)
I had been running under the assumption that the sample snippet was too
simple, so fortunately the code I just wrote is not bogus… thanks!


Aki Inoue wrote:
> Yes, admittedly, the sample code is probably too simplified.
>
> Usually you should store your custom field editor instance somewhere
> and have mapping mechanism between the editor and window/object.
>
> Also, another issue with this sample is that it's returning the custom
> editor for all NSTextField subclasses and could cause issues if there
> is an NSTextField subclass that already requires its own NSTextView
> subclass.
>
> It should selectively return the custom field editor.
>
> I filed a bug 5670642 for requesting tech document improvement.
>
> Thanks,
> Aki
>
> On 2008/01/04, at 11:35, John Stiles wrote:
>

>> I'm looking at creating a custom field editor (so I can filter out
>> keystrokes in various types of controls in a consistent way).
>> The text editing programming guide has a section called "How to
>> Substitute a Custom Field Editor", with an example snippet which
>> seems nice and simple:
>>

>>> (id)windowWillReturnFieldEditor:(NSWindow *)sender
>>> toObject:(id)anObject
>>> {
>>>    if ([anObject isKindOfClass:[NSTextField class]])
>>>    {
>>>        return [[[myCustomFieldEditor alloc] init] autorelease];
>>>    }
>>>    return nil;
>>> }

>>
>>
>> (Admittedly, there are two problems in the code—no leading hyphen and
>> a lowercase class name—but I'm going to let that slide for now :) )
>> However, according to the docs for
>> -windowWillReturnFieldEditor:toObject:, this code is actually broken:
>>

>>> Discussion
>>> This method may be called multiple times while a control is first
>>> responder. Therefore, you must return the same field editor object
>>> for the control while the control is being edited.

>>
>> This seems to directly contradict the sample code above, so which is
>> correct? I'll happily file it, but I just wanted to run this past
>> someone who might have already been down this road before.
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>