Custom field editors
Custom field editors
- Subject: Custom field editors
- From: John Stiles <email@hidden>
- Date: Fri, 04 Jan 2008 11:35:38 -0800
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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