Hi Andy,
I'm still not familiar with the text system, so I don't know if the
proxy was a good way to do this.
But assuming it was, try implementing forwardingTargetForSelector:
instead of forwardInvocation:. It's less flexible, but much faster,
and your case doesn't require the flexibility.
-Ken
On Tue, Aug 12, 2008 at 5:12 PM, Andy Kim <[EMAIL PROTECTED]> wrote:
> Many thanks to everyone who helped in this thread.
>
>> I wonder if this is a larger bug in the text system? I was going to
>> suggest
>> just inserting the Unicode character "zero-width no-break space" (U+FEFF)
>> after the slash, but when I tried it (in TextEdit) I got the very
>> phenomenon
>> you describe - the break occurs before "delete", not after.
>>
>> I was able to solve the problem, though, by also inserting a "zero-width
>> space" (U+200B) before the slash... So there's a solution for you, but it
>> seems unnecessarily elaborate. m.
>
> Matt,
>
> I may have to go with your solution for cell drawing although I'm hesitant
> before proceeding. The program has to make it seem like the character is not
> there and that could get a bit hairy with all the delete operations and copy
> paste, but I'm leaning towards that solution because I can't figure out how
> to get an outline view cell to draw efficiently using a custom
> NSTextStorage.
>
> In a text view though, Ken's suggestion of subclassing a NSTextStorage and
> overriding lineBreakBeforeIndex:withinRange: worked out well. It turns out
> that subclassing is a little tricky because NSTextStorage is not a concrete
> class so here's what I did for posterity sake:
>
> @interface PFTextStorage : NSProxy
> {
> NSTextStorage *realStorage;
> }
> - (id)initWithTextStorage:(NSTextStorage *)storage;
> @end
>
>
> @implementation PFTextStorage
>
> - (id)init
> {
> realStorage = [[NSTextStorage alloc] init];
> return self;
> }
>
> - (id)initWithTextStorage:(NSTextStorage *)storage
> {
> realStorage = [storage retain];
> return self;
> }
>
> - (void)dealloc
> {
> [realStorage release];
> [super dealloc];
> }
>
> - (BOOL)respondsToSelector:(SEL)aSelector
> {
> return [realStorage respondsToSelector:aSelector];
> }
>
> - (NSMethodSignature *)methodSignatureForSelector:(SEL)aSelector
> {
> return [realStorage methodSignatureForSelector:aSelector];
> }
>
> - (void)forwardInvocation:(NSInvocation *)invocation
> {
> SEL aSelector = [invocation selector];
>
> if ([realStorage respondsToSelector:aSelector])
> [invocation invokeWithTarget:realStorage];
> else
> [realStorage doesNotRecognizeSelector:aSelector];
> }
>
> - (NSUInteger)lineBreakBeforeIndex:(NSUInteger)index
> withinRange:(NSRange)aRange
> {
> NSString *string = [realStorage string];
> NSUInteger breakIndex = [realStorage lineBreakBeforeIndex:index
> withinRange:aRange];
> if (breakIndex >= 2 &&
> [string characterAtIndex:breakIndex-1] == '/' &&
> [[NSCharacterSet whitespaceCharacterSet]
> characterIsMember:[string characterAtIndex:breakIndex-2]])
> return breakIndex - 2;
>
> return breakIndex;
> }
>
> @end
>
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