OK, I have spent the last night by digging into the cocoa text system
and this is what I could come up with.
I'm sure this is not the best way to do it, but the result is very
close to what I want to achieve.
Basically I use the NSLayoutmanager to find how it would lay out the
first line of the text and then do the drawing myself.
Any comment on this?
I really want to do this nicer..
Here is the code:
-(void) drawLabel:(NSString *)label inRect:(NSRect)rect
{
NSTextStorage *textStorage = [[NSTextStorage alloc]
initWithString:label];
NSMutableParagraphStyle *globalStyle = [[NSParagraphStyle
defaultParagraphStyle] mutableCopy];
[globalStyle setLineBreakMode:NSLineBreakByWordWrapping];
[globalStyle setAlignment:NSCenterTextAlignment];
[textStorage addAttribute:NSParagraphStyleAttributeName
value:globalStyle range:NSMakeRange(0, [label length])];
NSTextContainer *textContainer = [[NSTextContainer alloc]
initWithContainerSize:rect.size];
NSLayoutManager *layoutManager = [[NSLayoutManager alloc] init];
[layoutManager addTextContainer:textContainer];
[textStorage addLayoutManager:layoutManager];
int glyphIndex = 0;
NSRange range;
NSRange glyphRange = [layoutManager
glyphRangeForTextContainer:textContainer];
int lines = 1;
while (YES)
{
NSRect lineRect = [layoutManager
lineFragmentUsedRectForGlyphAtIndex:glyphIndex effectiveRange:&range];
lineRect.origin.x += rect.origin.x;
lineRect.origin.y = (rect.origin.y + rect.size.height) -
(lineRect.size.height * lines);
NSString *s = nil;
if (lines == 1)
{
s = [label substringWithRange:range];
}
else
{
s = [label substringFromIndex:range.location];
}
[[NSColor redColor] set];
NSRectFill(lineRect);
NSMutableParagraphStyle *style = [[NSParagraphStyle
defaultParagraphStyle] mutableCopy];
[style setLineBreakMode:NSLineBreakByTruncatingMiddle];
[style setAlignment:NSCenterTextAlignment];
[s drawInRect:lineRect withAttributes:[NSDictionary
dictionaryWithObject:style forKey:NSParagraphStyleAttributeName]];
if (NSMaxRange(range) >= NSMaxRange(glyphRange))
{
break;
}
glyphIndex = NSMaxRange(range);
lines++;
}
[textStorage release];
[textContainer release];
[layoutManager release];
}
On Nov 1, 2008, at 2:39 AM, Mudi Dandan wrote:
Hi,
I'm needing a hand with this. I'm trying to emulate the wrapping and
truncation for icon labels in Finder's icon view.
My first question is: is there any method around for making a string
to line wrap, and to truncate the second line if it is too long
(like on the right hand image in the screenshot). Is this supported
in an API?
The second questions is: can the NSAttributedString render the
background for the text like the ones on the screenshots or is it
something I have to draw myself?
here's the screenshot:
http://www.binarynights.com/images/Screenshot.png
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