I need to support arbitrary superscript, not just squared...
I should be clear:
- I initially only set superscript attribute for the characters that
are superscript, i.e. part of a larger string.
- When this attributed string was given to an NSTextField (static
non editable), the textfield draws it with the baseline offset
downward, so the text looks incorrectly aligned alongside a
neighbouring text field.
- So, I experimented with setting NSBaselineOffsetAttributeName for
the entire string to correct the problem (as I don't want to get into
font and individual offset calculations unless I have to).
What I discovered was that baseline offset has three effects: above,
at or below normal position, corresponding negative, zero, or positive
values, which seems to conflict with the documentation. However,
setting a negative value fixes my issue, so I'm happy, if a little
concerned.
Note I just checked what happens if I set
NSBaselineOffsetAttributeName and don't set
NSSuperscriptAttributeName; it has no effect no matter what the value
is...
Thanks for the info
Rua HM.
On Jul 23, 2008, at 4:43 AM, Ross Carter wrote:
The strange thing is that there only seem to be 3 baseline
positions supported by NSTextField; any positive value, 0, and any
negative value.
I assume you've seen this, from http://developer.apple.com/documentation/Cocoa/Conceptual/AttributedStrings/Articles/standardAttributes.html#/
/apple_ref/doc/uid/TP40004903
"The superscript attribute indicates an abstract level for both
super- and subscripts. The user of the attributed string can
interpret this as desired, adjusting the baseline by the same or a
different amount for each level, changing the font size, or both."
Are you perhaps setting a baseline attribute _and_ a superscript
attribute? It sounds like the Cocoa text system is adjusting the
baseline according to its notion of superscripts and ignoring your
baseline attribute value.
Personally, I don't think NSSuperscriptAttributeName is particularly
useful. I just adjust the baseline and font size: newFontSize =
oldFontSize * 0.75, baseline for superscript += 0.4 * oldFontSize,
baseline for subscript -= 0.3 * oldFontSize.
If the only thing you need to draw is a superscript 2, I like
Andrew's solution.
Ross
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