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In article <1992Jul29.162437.3218@agora.uucp> bobb@agora.rain.com (Bob  
Beauchemin) writes:
> 
>   I'm trying to make a subclass of TextField object that cannot be copied
> with the cut/copy keys or cut/copy menu entries. I made a subclass called
> XTextField and set it up with a "empty" copy method (ie a copy method that
> does nothing but printf("copy method invoked").
>   However, I can still copy the text and my custom copy method does not
> ever appear to get invoked during the COPY operation.
> 
>   I've read that all TextField objects share the same Text object for
> rendering text. Can I override the COPY method in this Text object somehow?
> Is this why my subclass of TextField with a custom COPY method will not
> work?
> 
>   Does anyone have/know of any examples of a TextField (or Text) subclass
> that cannot be copied?
> 
>   Thanks,
> 
> Bob Beauchemin
> bobb@agora.rain.com

You are correct about the Text object.  The TextField object doesn't have  
firstResponder when you are typing text into the field, the Text object does.   
One way to accomplish what you want is to subclass text that overrides the  
copy:, cut:, and paste: messages then use this subclass in your window by  
returning it via the Window's delegate message,  
windowWillReturnFieldEditor:toObject:

here's some example code (implemented in the window's delegate):

- windowWillReturnFieldEditor:sender toObject:client
{	NXRect		fRect;
	static id	ourFieldEditor = nil;
	
	if (!ourFieldEditor)
	{	fRect.origin.x=fRect.origin.y = 0.0;
		fRect.size.width = fRect.size.height = 100.0;
		ourFieldEditor = [[MyTextSubclass alloc] initFrame:&fRect];
	}
	return(ourFieldEditor);
}

Naturally you might want to have a flag in your subclass that has a flag that  
can be set so not all the fields in your window behave this way.

- Drew
--
+--------------------------------+-------------------------------------------+
|        Drew  Davidson          | The perfect development team:             |
|         Software Guy           | One person paid per line of code written  |
| First National Bank of Chicago | and another paid per line of code removed |
|     drew@fnbc.com  (NeXTmail)  |                     - Frank Mitchell      |
+--------------------------------+-------------------------------------------+