[Biococoa-dev] BCSequenceView

Koen van der Drift kvddrift at earthlink.net
Sat Mar 5 18:42:46 EST 2005

On Mar 3, 2005, at 3:01 AM, Charles PARNOT wrote:

> My gut feeling is that subclassing NSTextView is 'evil', and that 
> instead the NSTextView should be a ivar and a subview (taking all the 
> space for now, but in the future a BCSequenceView could have several 
> subviews with several text fields like 'sequence length', 'current 
> selection',...), and that BCSequenceView could be the NSTextView 
> delegate to respond to user input and reformat the text view contents 
> accordingly. Sorry this is not very detailed, so you can ignore it if 
> that does not make sense!

If BCSequenceView is the delegate, then I wouldn't call it a view :) 
Apple actually documents subclassing an NSTextView, so I don't see why 
it is evil. I think what you have in mind is more a complete window, 
with a view, and several widgets. For that you would need to create a 
controller class, probably a NSWindowController subclass.

If we want more control over the way the sequence is displayed in a 
view, overriding NSLayoutManager et al, as explained by Alex is 
probably the way to go. I am not sure however, if that would be in 
place 'in the framework' of BioCocoa.

- Koen.

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