I meant issue with CTFrameGetLineOrigins :)
George On Sat, Apr 16, 2011 at 5:40 PM, Malayil George <georg...@gmail.com> wrote: > Seems to be an issue with CTLineGetTypographicBounds when calling it for a > single line. > > Changing the code to below seems to fix the issue. > CGPoint origin[numberOfLines]; > > CTLineGetTypographicBounds(line, &ascent, &descent, NULL); > CTFrameGetLineOrigins(_frame, CFRangeMake(0, 0), origin); > > I filed a bug report bug ID 9295523 > > > Thanks > George > > > > On Mon, Apr 11, 2011 at 11:22 PM, Malayil George <georg...@gmail.com>wrote: > >> Hi, >> I'm trying to follow the SimpleTextInput example project at >> http://developer.apple.com/library/ios/#samplecode/SimpleTextInput/Introduction/Intro.html >> >> For the most part, it works fine, but, for some reason the following >> results in a wierd result drawing the caretRect. >> 1. Type in a few lines (about 7-8 lines in the Simulator (about >> 10 characters each line followed by a newline) >> 2. Click on some random point in the text in the last couple of >> lines. The caretRect is updated properly to the new location. >> 3. Click on some random point in the first or second line. The >> caret rect isn't drawn correctly and is way larger than usual - If there is >> a place I can post a screen shot that is acceptable to the thread, please >> let me know and I'd be happy to paste it :-) >> >> >> In an effort at debugging this, it looks like the ascent and descent >> values in caretRectForIndex function changes mid-call. I added a couple of >> NSLog statements to the relevant section ( I apologize for the lengthy code >> post here). The function is identical to Apple's except for the added NSLog >> statements. >> - (CGRect)caretRectForIndex:(int)index >> { >> NSArray *lines = (NSArray *) CTFrameGetLines(_frame); >> >> // Special case, no text >> if (_text.length == 0) { >> CGPoint origin = CGPointMake(CGRectGetMinX(self.bounds), >> CGRectGetMaxY(self.bounds) - self.font.leading); >> // Note: using fabs() for typically negative descender from fonts >> return CGRectMake(origin.x, origin.y - fabs(self.font.descender), >> 3, self.font.ascender + fabs(self.font.descender)); >> } >> >> // Special case, insertion point at final position in text after >> newline >> if (index == _text.length && [_text characterAtIndex:(index - 1)] == >> '\n') { >> CTLineRef line = (CTLineRef) [lines lastObject]; >> CFRange range = CTLineGetStringRange(line); >> CGFloat xPos = CTLineGetOffsetForStringIndex(line, range.location, >> NULL); >> CGPoint origin; >> CGFloat ascent, descent; >> CTLineGetTypographicBounds(line, &ascent, &descent, NULL); >> NSLog(@"Ascent, Descent: %f, %f", ascent, descent); >> CTFrameGetLineOrigins(_frame, CFRangeMake(lines.count - 1, 0), >> &origin); >> // Place point after last line, including any font leading spacing >> if applicable >> origin.y -= self.font.leading; >> NSLog(@"Ascent, Descent: %f, %f", ascent, descent); >> return CGRectMake(xPos, origin.y - descent, 3, ascent + >> descent); >> } >> >> // Regular case, caret somewhere within our text content range >> for (int i = 0; i < [lines count]; i++) { >> CTLineRef line = (CTLineRef) [lines objectAtIndex:i]; >> CFRange range = CTLineGetStringRange(line); >> NSInteger localIndex = index - range.location; >> if (localIndex >= 0 && localIndex <= range.length) { >> // index is in the range for this line >> CGFloat xPos = CTLineGetOffsetForStringIndex(line, index, >> NULL); >> CGPoint origin; >> CGFloat ascent, descent; >> CTLineGetTypographicBounds(line, &ascent, &descent, NULL); >> NSLog(@"Ascent, Descent: %f, %f", ascent, descent); >> CTFrameGetLineOrigins(_frame, CFRangeMake(i, 0), &origin); >> NSLog(@"Ascent, Descent: %f, %f", ascent, descent); >> // Make a small "caret" rect at the index position >> return CGRectMake(xPos, origin.y - descent, 3, ascent + >> descent); >> } >> } >> >> return CGRectNull; >> } >> >> The output from the above method when I click on the first couple of lines >> is something like >> 2011-04-11 23:09:02.670 SimpleTextInput[33460:207] Ascent, Descent: >> 13.860352, 4.139648 >> 2011-04-11 23:09:02.670 SimpleTextInput[33460:207] Ascent, Descent: >> 237.339645, 0.000000 >> >> The call to CTLineGetTypographicBounds seems to be working fine as >> evidenced by the low expected values of ascent and descent. But, for some >> reason, after CTFrameGetLineOrigins it is changing. I'm at a loss as to why >> these values are changing as there doesn't seem to be anything in the code >> modifying ascent and descent between the two NSLog statements. >> I've tried synchronizing the caretRect method body on self (but, it >> doesn't look like there are other threads that are modifying these values >> either). >> >> Any pointers on why ascent and descent is changing would be much >> appreciated :) >> >> >> Thanks >> George >> >> >> > _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
