I am writing a genealogy program that provides a variety of forms for
entering data from many sources, eg, censuses, marriage registers.
Instead of custom designing user input panels for each type of record,
I am using a specification file that describes the fields and tool
tips needed for each form and then use a custom layout manager to
layout a specific user interface panel/dialog for each form on the the
fly.
In writing this I have discovered that the font used in labels is
LucidaGrande with a font size of 13. The value of labels is generally
just an NSString which Aqua lays out in LucidaGrande/13.
For the layout manager I must calculate the lengths of all the labels
to be used on a given form so I can lay them all out together using
Apple UI guidelines. To find the sizes of the label text I create an
NSAttributedString for each one with the correct font and font size
and then ask for the length of this attributed string.
This all works and seems to be fine, but I have found something that
bothers me a little bit.
As mentioned I have discovered that the font size in labels (when
created directly from Interface Builder) is 13. However, when using
the NSFont method +(CGFloat)labelFontSize the value returned is 10.
Before I discovered that the font size used in labels was 13 I was
using the labelFontSize when setting up the attributed strings, so
things didn't work.
My question is. Why are labels rendered at 13 font when the NSFont
method labelFontSize returns a value of 10? What deep dark secrets do
I still have to learn?
Tom Wetmore
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