Re: Controlling line-breaking in a text view

[Andy Kim]

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.


seems unnecessarily elaborate. m.

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

Matt,





@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];
}


{
        NSString *string = [realStorage string];

        if (breakIndex >= 2 &&
                [string characterAtIndex:breakIndex-1] == '/' &&

                return breakIndex - 2;

        return breakIndex;
}

@end

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: - (NSUInteger)lineBreakBeforeIndex:(NSUInteger)index withinRange: (NSRange)aRange NSUInteger breakIndex = [realStorage lineBreakBeforeIndex:index withinRange:aRange]; [[NSCharacterSet whitespaceCharacterSet] characterIsMember:[string characterAtIndex:breakIndex-2]])

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