In my text-editing app, there are some special characters I’d like to highlight
whenever they are entered. I developed a function for this purpose, found in my
subclass of NSTextView:
-(void)setTemporaryAttributes:(NSDictionary*)attributes
forSpecialCharacters:(NSCharacterSet*)set
inRange:(NSRange)searchRange
{
NSLayoutManager* lm = self.layoutManager;
NSTextStorage* ts = self.textStorage;
NSString* str = ts.string;
NSUInteger beyondIx = searchRange.location + searchRange.length;
NSLog( @"Searching for special chars in: %@", [str
substringWithRange:searchRange]);
while ( true ) {
NSRange foundRange = [str rangeOfCharacterFromSet:set
options:0
range:searchRange];
if ( foundRange.location == NSNotFound ) {
break;
}
[lm setTemporaryAttributes:attributes forCharacterRange:foundRange];
NSUInteger startIx = foundRange.location + foundRange.length;
if ( startIx >= beyondIx ) {
break;
}
searchRange = NSMakeRange( startIx, beyondIx - startIx );
}
}
If I call this right after loading text into the Text View, it works perfectly
and all the highlights appear in the right places.
But if I call it in response to NSTextStorageDelegate’s
textStorageDidProcessEditing:, it still finds the right characters in the right
ranges, but the highlighting appears in the wrong places, as if the Layout
Manager is not in sync and the ranges sent to
setTemporaryAttributes:forCharacterRange: don’t mean the same thing.
Is there a different place other than textStorageDidProcessEditing: that I
should do this, or is there something I should be doing to sync up the Layout
Manager before setting temporary attributes?
—
Charles Jenkins
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