NSTextView - using initWithHTML with tables - cocoa

Question

I'm trying to format some text in NSTextView to be placed in a single line with black background. One piece of text needs to be left aligned, the other piece (but still in the same line) needs to be centered.
NSString *header = [NSString stringWithFormat:
#""
"<table style=\"width: 100%; background: black; "
"color: white; font-family: Arial; "
"font-size: 16px;\"><tr><td>"
"1. zadatak"
"</td><td align=\"center\" width=\"100%\">"
""
"%#"
""
"</td></tr></table>"
"", [self.problemname.stringValue uppercaseString]];
Unfortunately, no matter what width I specify, NSTextView appears to ignore the table width.
Any workarounds, different approaches, or other suggestions?
More info on the background of the problem.
I've written an app for writing tasks for programming contests. Each task author submits content in different format, so getting them to standardize it in a simple bundle would be of great benefit.
I need this for a printing module. I'm taking several NSTextViews and stitching them together.
These contests have the following document formatting which we're supposed to follow - Example PDF (GoogleDocs)
:
Contest header
+------------------------------------------------+
| 1st Task TITLE 20 points |
+------------------------------------------------+
Introductory text here.
Input
Explanation of input data
Output
Explanation of output data
Sample Data
Input: | Input:
abcd | bcde
|
Output: | Output:
efgh | fghi
|
More info: |
info text |

Answer 1

Modification of Apple's sample code for programmatically adding tables to NSAttributedString:
- (NSMutableAttributedString *) printTitleTableAttributedString
{
NSMutableAttributedString *tableString = [[NSMutableAttributedString alloc] initWithString:#"\n\n"];
NSTextTable *table = [[NSTextTable alloc] init];
[table setNumberOfColumns:3];
[tableString appendAttributedString:[self printTitleTableCellAttributedStringWithString:#"1. zadatak\n"
table:table
textAlignment:NSLeftTextAlignment
row:0
column:0]];
[tableString appendAttributedString:[self printTitleTableCellAttributedStringWithString:[self.problemname.stringValue stringByAppendingString:#"\n"]
table:table
textAlignment:NSCenterTextAlignment
row:0
column:1]];
[tableString appendAttributedString:[self printTitleTableCellAttributedStringWithString:#"20 bodova\n"
table:table
textAlignment:NSRightTextAlignment
row:0
column:2]];
[table release];
return [tableString autorelease];
}
- (NSMutableAttributedString *) printTitleTableCellAttributedStringWithString:(NSString *)string
table:(NSTextTable *)table
textAlignment:(NSTextAlignment)textAlignment
row:(int)row
column:(int)column
{
NSColor *backgroundColor = [NSColor colorWithCalibratedRed:0
green:0
blue:0x80/255.
alpha:0xFF];;
NSColor *borderColor = [NSColor whiteColor];
NSTextTableBlock *block = [[NSTextTableBlock alloc]
initWithTable:table
startingRow:row
rowSpan:1
startingColumn:column
columnSpan:1];
[block setBackgroundColor:backgroundColor];
[block setBorderColor:borderColor];
[block setWidth:0.0 type:NSTextBlockAbsoluteValueType forLayer:NSTextBlockBorder];
[block setWidth:2.0 type:NSTextBlockAbsoluteValueType forLayer:NSTextBlockPadding];
NSMutableParagraphStyle *paragraphStyle =
[[NSParagraphStyle defaultParagraphStyle] mutableCopy];
[paragraphStyle setTextBlocks:[NSArray arrayWithObjects:block, nil]];
[paragraphStyle setAlignment:textAlignment];
[block release];
NSMutableAttributedString *cellString =
[[NSMutableAttributedString alloc] initWithString:string];
[cellString addAttribute:NSParagraphStyleAttributeName
value:paragraphStyle
range:NSMakeRange(0, [cellString length])];
[cellString addAttribute:NSForegroundColorAttributeName
value:[NSColor whiteColor]
range:NSMakeRange(0, [cellString length])];
[paragraphStyle release];
return [cellString autorelease];
}
Then I just append it into the textview:
[printText.textStorage setAttributedString:[self printTitleTableAttributedString]];

Answer 2

NSTextView's HTML support is only rudimentary. It does't hook into WebKit or anything to render full HTML.
The only way I know of that comes even close to accomplishing what you're trying to do with an NSTextView is tab stops. You can add an NSTextTab with an alignment of NSCenterTextAlignment to the line's paragraph style. Then use a tab to separate the left-aligned text from the center-aligned text.
The biggest problem with this is that you have to calculate the center point of your text view and create your tab stop at that location every time the size of your text view changes.
I suppose you could also subclass NSLayoutManager, but that's probably more heavy-handed than you were expecting.