Responding to myself, here:
> 1) When I dump rich text into the text view, this method is called *twice*
> for each starting glyph index, and the proposed rect for the second call is
> the proposed rect I modify during the first call. For plain text it's only
> called once for each line. Any explanations for what's going on?
I still have no idea what the answer is.
> 2) Is simply modifying the proposed rect's origin the right approach?
> a) Does the proposed rect ever include lineFragmentPadding
> b) Is the proposed rect always a bazillion points wide?
Answers:
2) Yes.
2a) No.
2b) It *think* so.
> 3) Is it always going to be safe to ask the layout manage
> locationForGlyphAtIndex: for a glyph index < startingGlyphIndex or is there
> any possibility of an infinite loop?
Answer: yes it's possible to get in an infinite loop. There seems to be no
solution other than not using locationForGlyphAtIndex. So rather than using the
location of the first non-whitespace character to determine indentation, the
answer is to calculate the width of the indentation "manually". I took a look
at how Xcode does it, and it actually does this as well.
So here's what I've got:
- (void)getLineFragmentRect:(NSRectPointer)lineFragmentRect
usedRect:(NSRectPointer)lineFragmentUsedRect
remainingRect:(NSRectPointer)remainingRect
forStartingGlyphAtIndex:(NSUInteger)startingGlyphIndex
proposedRect:(NSRect)proposedRect lineSpacing:(CGFloat)lineSpacing
paragraphSpacingBefore:(CGFloat)paragraphSpacingBefore
paragraphSpacingAfter:(CGFloat)paragraphSpacingAfter
{
AGSourceTextStorage * textStorage = (AGSourceTextStorage
*)self.layoutManager.textStorage;
if (![textStorage isKindOfClass:[AGSourceTextStorage class]]) {
[NSException raise:@"" format:@"AGSourceTypesetter's text
storage is not an AGSourceTextStorage"];
}
if (textStorage.indentWrappedLines) {
NSString * string = textStorage.string;
NSUInteger characterIndex = [self.layoutManager
characterIndexForGlyphAtIndex:startingGlyphIndex];
NSRange lineRange = [string
lineRangeForRange:NSMakeRange(characterIndex, 0)];
// Find the line range for the line of text this glyph is a
part of
characterIndex = [self.layoutManager
characterIndexForGlyphAtIndex:startingGlyphIndex];
lineRange = [string
lineRangeForRange:NSMakeRange(characterIndex, 0)];
// If the startingGlyphIndex's character is *after* the
beginning of the line
// of text it's on, then the lineFragmentRect being asked for
must be part
// of a wrapped line - which we want to indent.
if (characterIndex > lineRange.location) {
NSUInteger lineNumber = [textStorage
lineNumberAtCharacterLocation:characterIndex];
CGFloat indentation = [textStorage
indentationForWrappedLineNumber:lineNumber];
// TODO: Do we need to do anything special for
lineFragmentPadding *here*?
// ...
// Modify the proposed rect to create that indentation
CGFloat maxX = NSMaxX(proposedRect);
proposedRect.origin.x = indentation;
proposedRect.size.width = maxX - indentation;
}
}
// After having possibly indented the proposed rect, let the standard
class do its thing.
[super getLineFragmentRect:lineFragmentRect
usedRect:lineFragmentUsedRect remainingRect:remainingRect
forStartingGlyphAtIndex:startingGlyphIndex proposedRect:proposedRect
lineSpacing:lineSpacing paragraphSpacingBefore:paragraphSpacingBefore
paragraphSpacingAfter:paragraphSpacingAfter];
}
indentationForWrappedLineNumber in the text storage class counts the number of
spaces at the beginning of the line, and multiplies that by a standard width
for a space which was precalculated.
Seems to work, and it's reassuring to know that Xcode also apparently thinks
this is a good solution and I think some smart folks work on that. ;-)
--
Seth Willits
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