Re: NSTextView and limiting text attributes via delegate
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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