Re: Dynamic color changes in a text view

FROM : Mike Ferris
DATE : Tue Dec 31 19:46:03 2002

Ah, so when I said you can't just change the color object, of course
that was incorrect if you do something like Greg suggests ;-).

Mike


Begin forwarded message:

> From: Greg Titus <<email_removed>>
> Date: Tue Dec 31, 2002  10:29:38 AM US/Pacific
> To: Daryn <<email_removed>>
> Cc: <email_removed>
> Subject: Re: Dynamic color changes in a text view
>
> On Tuesday, December 31, 2002, at 10:11  AM, Daryn wrote:
>
>> I have a text view that contains text with various configurable
>> colors.  Using a continous color well, I'd like the existing text to
>> change color.
>>
>> My thoughts about how to implement this would involve adding my own
>> attributes (ie. "MyRedColor", "MyGreenColor", etc) to the text
>> storage in order to use attribute:atIndex:effectiveRange: to iterate
>> over the storage and update the color.
>>
>> Is there a simpler method to achieve this result?  For example, is it
>> possible to conceptually change a single color object that all the
>> colored ranges use?
>
> Make your own custom subclass of NSColor and set instances of that
> subclass as the colors on your text. Implement the -set method to call
> -set on a real NSColor object with whatever color is appropriate at
> that moment.
>
> Then all you should need to do is tell your text view
> -setNeedsDisplay:YES when your colors change, and the existing objects
> in the text storage will  cause the right colors to be used when the
> view is redrawn.
>
> Hope this helps,
>      - Greg
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