NSAttributedString in NSTextFieldCell (NSTableView)
NSAttributedString in NSTextFieldCell (NSTableView)
- Subject: NSAttributedString in NSTextFieldCell (NSTableView)
- From: Andrew Cooper <email@hidden>
- Date: Sat, 24 Jun 2006 03:08:27 -0500
I'm having trouble adjusting the baseline offset of a string in an
NSTextFieldCell. I'm designing a UI to be driven with a touchscreen
so I need something bigger than normal and so I'm wanting the font
and cells in my table to be larger than usual. Because of the larger
cell height and wanting to keep white space around the text i've
sized the cell larger than the text and it is vertically aligned to
the top edge. I'd like to center this and I am having trouble doing so.
I've found that this has been discussed before on this list, but the
suggested solution of using NSAttributedStrings with the
NSBaselineOffsetAttributeName attribute set to a negative value does
not work for me. I can set just about any other parameter font,
color, underline, strikethrough, obliqueness, etc and they all work,
but anything involving the baseline like
NSBaselineOffsetAttributeName or NSSuperscriptAttributeName seems to
do nothing at all.
I am using a custom formatter connected to the NSTextFieldCell
prototype of my table's column, shown below.
The results of this are shown in http://hkcreations.org/
attributedStringResult.png
I've made the cells very tall to illustrate that the baseline is not
being affected.
I've read that I can also subclass the cell to implement my own
centering, but i'd like to use this solution if possible because it's
much cleaner.
Thanks to anyone who has suggestions for me.
Andrew Cooper
@implementation AMCenterFormatter
- (id) init {
self = [super init];
if (self != nil) {
NSNumber *blOffset = [NSNumber numberWithFloat:-15.0];
NSFont *font = [NSFont systemFontOfSize:20];
attributes = [[NSDictionary alloc] initWithObjectsAndKeys:
font,NSFontAttributeName,
blOffset,NSBaselineOffsetAttributeName,
nil];
}
return self;
}
- (NSAttributedString *)attributedStringForObjectValue:(id)anObject
withDefaultAttributes:(NSDictionary *)attr
{
NSString *str = [self stringForObjectValue:anObject];
return [[[NSAttributedString alloc] initWithString:str
attributes:attributes] autorelease];
}
- (BOOL)getObjectValue:(id *)anObject
forString:(NSString *)string
errorDescription:(NSString **)error
{
if (anObject)
*anObject = [[string copy] autorelease];
return YES;
}
- (NSString *)stringForObjectValue:(id)anObject
{
return [anObject description];
}
@end
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