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Re: NSTextView and limiting text attributes via delegate
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Re: NSTextView and limiting text attributes via delegate


  • Subject: Re: NSTextView and limiting text attributes via delegate
  • From: Douglas Davidson <email@hidden>
  • Date: Fri, 3 Feb 2006 15:17:34 -0800


On Feb 3, 2006, at 3:01 PM, Scott Lehman wrote:

I have an NSTextView, but want to limit the kinds of
formatting that can be used in it.  The new delegate
method
textView:shouldChangeTypingAttributes:toAttributes:
caught my eye as a good place to start, however it
doesn't seem to do what I expect.


The typing attributes are the attributes that will be used for the next character that is typed. Try bringing up an empty document in TextEdit, hitting cmd-U, and typing something; it should appear underlined. Your implementation of the delegate method should be able to prevent that.


However, you also want to control changes to the text. You can use textView:shouldChangeTextInRange:replacementString: to be notified of this. Try making a note of the range in this method--modifying its length based on the replacement string's if there is one--and then in textDidChange: you can examine the changed text and remove any unwanted attributes.

Another alternative would be to use a custom text storage, not to change the storage mechanism, but to override attribute fixing. Working at the text view delegate level lets you control user- initiated changes. At the text storage level, you can modify all changes, programmatic or user-driven.

Douglas Davidson

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