On Jun 30, 2009, at 9:52 AM, Riccardo Canalicchio wrote:
I'm developing an application for MacOSX, based on Core Animation.
I would like to know the best way to render a fixed-width text
paragraph
inside a CALayer. I already tried with CATextLayer, which indeed
gave me a
fixed-width text but I wasn't able to make height automatically adjust
accordingly to the number of lines in the paragraph.
To some extent it depends on your application.
I would recommend looking at the Cocoa text system and in particular
how to assemble the text system "by hand":
http://developer.apple.com/documentation/Cocoa/Conceptual/TextArchitecture/Tasks/AssembleSysByHand.html
Using that you could determine the size and layout (line breaks) for a
section of text (fixed-width or not). You could also use that system
to draw the text onto the layer using the NSLayoutManager:
- (void)drawBackgroundForGlyphRange:(NSRange)glyphsToShow atPoint:
(NSPoint)origin;
- (void)drawGlyphsForGlyphRange:(NSRange)glyphsToShow atPoint:(NSPoint)
origin;
If Cocoa is not to your liking, then you could also use the Core Text
system, a C interface that the Cocoa Text (at least in part) is built
upon:
http://gemma.apple.com/documentation/Carbon/Conceptual/CoreText_Programming/Introduction/Introduction.html
Scott
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