Update:
If I set the superscript attribute for the exponent, and set a
negative value (any negative value), the baseline is appropriate (i.e.
lines up with surrounding controls).
The strange thing is that there only seem to be 3 baseline positions
supported by NSTextField; any positive value, 0, and any negative value.
Is this correct behaviour? The documentation for
NSBaselineOffsetAttribute name states that:
"The baseline offset attribute is a literal distance, in pixels, by
which the characters should be shifted above the baseline (for
positive offsets) or below (for negative offsets)."
http://developer.apple.com/documentation/Cocoa/Conceptual/AttributedStrings/Articles/standardAttributes.html#/
/apple_ref/doc/uid/TP40004903
I like the fact that I can specify a negative number and it appears to
correctly account for my superscript exponent, but I'm concerned that
the value may actually be used in future, and/or there is some
complicated interaction between the attributes. Is there documentation
on NSTextField's support for attributed strings that explains why this
is happening? Or should I report this as a bug?
Can anyone shed any light on why this is happening?
thanks
Rua HM.
On Jul 21, 2008, at 4:27 PM, Rua Haszard Morris wrote:
I am using NSSuperscriptAttributeName to make part of a string
displayed in an NSTextView label display as superscript (to show "to
the power of 2"). I may also use a smaller font attribute to make
the "2" char smaller.
My problem is that thebaseline of the text drawn in the NSTextView
is moved down (presumably to accommodate the superscript 2) and the
label now looks wrong as the text doesn't line up with the other
edits and labels on the line in the dialog.
Is there a correct, standard way to keep the baseline fixed when
using an NSAttributedString in a NSTextView used as a label?
I've tried using a multi-line NSTextView, but this makes no
difference. There is the possibility of tweaking the
NSBaselineAttribute, or even the position of the NSTextView, but
both approaches seem hacky or overkill (i.e. I'd need to correctly
determine the baseline offset by querying the font superscript
offset? and converting to pixels?)
thanks
Rua HM.
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