Re: Changing the text of an NSTextView without killing undos
Re: Changing the text of an NSTextView without killing undos
- Subject: Re: Changing the text of an NSTextView without killing undos
- From: Jonathan Wight <email@hidden>
- Date: Fri, 28 Nov 2003 11:00:21 -0600
If anyone is interested I've created a small sample application that
highlights the problem...
http://homepage.mac.com/jwight/FileSharing24.html
Jon.
On Nov 27, 2003, at 23:35, Jonathan Wight wrote:
>
Is there a way to modify the contents of an NSTextView without breaking
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the undo stack?
>
>
For example, let's say a user has typed 'FOOBAR' into an empty
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NSTextView. At this point I programmatically replace the 'FOOBAR' with
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the text 'MOOF'. The user hits undo and suddenly the undo stack dies
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complaining that it tried to removed 6 characters (the length of
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'FOOBAR') when there were only 4 characters in the text view (the
>
length of 'MOOF'). Basically the undo stack is out of sync with the
>
actual contents of the text.
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>
Now the obvious solution is to make my programatic modification
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undoable. This does work. Unfortunately I need to modify the text in
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response to the user's typing. The obvious place to do it is inside the
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NSTextView's degelate method 'textDidChange'. Unfortunately even if my
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changes are undoable the fact that I'm making my changes inside
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textDidChange causes the undo stack to die just like it was before.
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>
I've also tried making my changes inside NSTextStorage delegate's
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textStorageWillProcessEditing method. But when I change the text there
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I don't see the changes occur immediately in the text view.
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>
Anyone got any suggestions?
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>
Jon.
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>
[demime 0.98b removed an attachment of type
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application/pkcs7-signature which had a name of smime.p7s]
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