Hi!
As far as I know setShowsControlCharacters/setShowsInvisibleCharacters
does not work or they only work with some special fonts. But it is
fairly easy to implement it yourself (but it does make it slightly
slower). What you need to do is use your own NSLayoutManager in your
NSTextView and override -
(void)drawGlyphsForGlyphRange:(NSRange)glyphRange
atPoint:(NSPoint)containerOrigin and there basically check if the
glyph is one that you want visible and, if so, draw it yourself.
Something like this:
- (void)drawGlyphsForGlyphRange:(NSRange)glyphRange
atPoint:(NSPoint)containerOrigin
{
if (showInvisibleCharacters) {
completeString = [[self textStorage] string];
lengthToRedraw = NSMaxRange(glyphRange);
for (index = glyphRange.location; index < lengthToRedraw; index++) {
characterToCheck = [completeString characterAtIndex:index];
if (characterToCheck == '\t') {
pointToDrawAt = [self locationForGlyphAtIndex:index];
glyphFragment = [self lineFragmentRectForGlyphAtIndex:index
effectiveRange:NULL];
pointToDrawAt.x += glyphFragment.origin.x;
pointToDrawAt.y = glyphFragment.origin.y;
[tabCharacter drawAtPoint:pointToDrawAt withAttributes:attributes];
}
}
}
[super drawGlyphsForGlyphRange:glyphRange atPoint:containerOrigin];
}
You can check out some complete workable code at
http://smultron.sourceforge.net (the SMLLayoutManager class).
Peter
On Sun, 2 Jan 2005 18:36:56 -0800, Jean Bovet
<email@hidden> wrote:
> Hello all!
>
> Is it possible to show invisible/controls characters (like carriage
> return, tab, etc) in a NSTextView using
> setShowsControlCharacters/setShowsInvisibleCharacters ? I have tried
> both methods but nothing is displayed: is this related to the font I'm
> using ?
>
> Thanks.
>
> Jean
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