Either I'm misunderstanding your question, or you're
misunderstanding the Geometries code. I think you want -
widthForHeight:attributes:, with the height specified for three
lines (could just take it from what IB sets for you, or first get a
heightForWidth:reallyBig, then triple that). The demo program has a
-heightForWidth:attributes: case, just flip it around. This code
_does_ work for a multi-line height, and does allow for correct
wrapping, font changes in mid fly, multibyte characters, and all the
rest.
No, the code does not work for multi-line height. If the text that has
to be layouted does _not_ have newlines (so if I have one long line of
text), then widthForHeight just returns the width of the text as if it
is layouted in one long line. But I want the minimal width that is
necessary so that the text is wrapped around into three lines.
I think this is the missing point: my text has no line breaks. It is
one long line. But I am searching for a rectangle where the text is
wrapped around into 3 lines and I am searching the optimal width for
that.
OK. So I took NS(Attributed)String+Geometics and put the following
test code in:
{
NSDictionary *attributes = [NSDictionary dictionaryWithObjectsAndKeys:
[NSFont systemFontOfSize:12.0], NSFontAttributeName,
nil];
NSString *test = @"This is a very long line. It should be wrapped into
three lines. And I want to get the optimal (minimal) width for that.";
float width = [test widthForHeight:45.0 attributes:attributes]; // a
height of 45.0 is capable of holding 3 lines of 12pt system font
NSLog(@"width = %f", width);
// this is what widthForHeight internally does:
NSSize size = [test sizeForWidth:FLT_MAX height:45.0
attributes:attributes];
NSLog(@"size = %@", NSStringFromSize(size));
}
Output is:
2008-04-21 19:40:20.317 StringGeometricsDemo[17913:10b] width =
686.863281
2008-04-21 19:40:20.319 StringGeometricsDemo[17913:10b] size =
{686.863, 15}
So, this is really NOT what I want. This is the width for the text if
it is layouted in one line.
In the meantime I have a solution that searches for the optimal width
with a binary search algorithm (just takes a few layouts to get a good
result).
The result that I get for the text above is {246, 45}, and that's
exactly the result that I wanted.
246 is the smallest width so that the text fits completely into the
rectangle and is wrapped into 3 lines.
If I choose a smaller width, the text will be clipped (it will not fit
completely in the rectangle).
If I choose a wider width, the text will be wrapped in less than 3
lines at some point.
Regards,
Mani
--
http://www.mani.de
iVolume - Loudness adjustment for iTunes.
LittleSecrets - The encrypted notepad.
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