I'm working with an NSTextView and one of the requirements I have is that a
tab character, '\t', shall have the same width as four spaces.
So the text-content would look like this:
AAAA
AAAA - 1 tab
AAAA - 4 spaces
And this is how I accomplish this:
// done when NSTextView first loaded and when
// delegate's textDidBeginEditing gets called: (perhaps overkill, but is a
work in progress).
- (void)updateMyTextViewTextAttributes
{
NSMutableParagraphStyle* paragraphStyle = [[myTextView
defaultParagraphStyle] mutableCopy];
if (paragraphStyle == nil) {
paragraphStyle = [[NSParagraphStyle defaultParagraphStyle] mutableCopy];
}
float charWidth = [[myFont
screenFontWithRenderingMode:NSFontDefaultRenderingMode]
advancementForGlyph:(NSGlyph) ' '].width;
[paragraphStyle setDefaultTabInterval:(charWidth * 4)];
[paragraphStyle setTabStops:[NSArray array]];
[myTextView setDefaultParagraphStyle:paragraphStyle];
NSMutableDictionary* typingAttributes = [[myTextView typingAttributes]
mutableCopy];
[typingAttributes setObject:paragraphStyle
forKey:NSParagraphStyleAttributeName];
[typingAttributes setObject:scriptFont forKey:NSFontAttributeName];
[myTextView setTypingAttributes:typingAttributes];
}
This allows the appropriate layout to be shown with the initial text as
well as keep the typing attributes the same.
The problem is that the end-user can change the font. And when that
happens, the sample text becomes misaligned. Much like the below:
[smaller font]
AAAA
AAAA - 1 tab
AAAA - 4 spaces
[larger font]
AAAA
AAAA - 1 tab
AAAA - 4 spaces
I've tried calling myTextView's setNeedsDisplay:YES as I read that it ends
up calling NSTextView's setNeedsDisplayInRect:avoidAdditionalLayout with a
NO for the avoidAdditionalLayout parameter. This didn't change anything.
I've tried calling my updateMyTextViewTextAttributes call when myTextView
has the new myFont set. That doesn't change a thing.
I've also tried telling the layoutManager of myTextView to
ensureLayoutFOrTextContainer for the textContainer of myTextView. No change.
At this point, I'm not sure what to try next. Any suggestions?
Thanks in advance,
Lyndsey Ferguson
PS I've posted this to stackoverflow.com as well:
http://stackoverflow.com/questions/2284150/how-to-relayout-content-of-nstextview-so-that-my-tab-characters-are-drawn-with-wi
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