OK, bug found.
A really silly mistake on my part but I think it's worth reporting in case it
saves someone else a headache.
My NSTextView subclass has syntax coloring which is called on receipt of
NSTextStorageDidProcessEditingNotification.
In the method that does the coloring, I had the following:
[[self textStorage] beginEditing];
[self setTextColor:textColor range:r];
// do other coloring stuff by setting attributes on the NSTextStorage,
e.g.,
[[self textStorage] addAttribute:NSForegroundColorAttributeName
value:commentColor range:commRange];
// ..... other stuff
[[self textStorage] endEditing];
So I think it is a bad thing to make calls to NSTextView methods which change
the text in between calls to begin/endEditing. So moving the setTextColor: call
above beginEditing fixes the problem.
I still don't understand why it is depending on initializing the text storage
with an empty string or not. Still some head scratching to do, I think.
Martin
On Apr 8, 2010, at 5:57 AM, Martin Hewitson wrote:
>
> On Apr 7, 2010, at 10:50 PM, Ross Carter wrote:
>
>> On Apr 7, 2010, at 11:52 AM, Martin Hewitson <[email protected]>
>> wrote:
>>
>>> Hi Kyle,
>>>
>>> At the moment it does nothing but call super. I was using it to handle
>>> line-wrapping, but in the process of debugging this problem it's reduced to
>>>
>>> - (void)insertText:(id)aString
>>> {
>>> [super insertText:aString];
>>> }
>>
>> I would set a breakpoint here and examine a description of the textStorage
>> and the layoutManager. Also, are you creating the NSTextStorage from an
>> empty string? Nil? Or possibly some other value?
>
> Sometimes the NSTextStorage is created from an empty string, sometimes not.
> In the case the string is empty, I get the exceptions. If the string is not
> empty, I don't get the exceptions. A single whitespace character in the
> string is enough to stop the exceptions.
>
> Martin
>
>>
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>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Martin Hewitson
> Albert-Einstein-Institut
> Max-Planck-Institut fuer
> Gravitationsphysik und Universitaet Hannover
> Callinstr. 38, 30167 Hannover, Germany
> Tel: +49-511-762-17121, Fax: +49-511-762-5861
> E-Mail: [email protected]
> WWW: http://www.aei.mpg.de/~hewitson
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
>
>
>
>
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Martin Hewitson
Albert-Einstein-Institut
Max-Planck-Institut fuer
Gravitationsphysik und Universitaet Hannover
Callinstr. 38, 30167 Hannover, Germany
Tel: +49-511-762-17121, Fax: +49-511-762-5861
E-Mail: [email protected]
WWW: http://www.aei.mpg.de/~hewitson
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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