Re: Custom field editors

FROM : Aki Inoue
DATE : Fri Jan 04 20:54:21 2008

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$B!=(Bno leading 
> hyphen and a lowercase class name$B!=(Bbut 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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