On 14 Aug 2012, at 01:30, Ross Carter <rosscarter...@me.com> wrote:
>
> On Aug 12, 2012, at 5:34 AM, Gerriet M. Denkmann <gerr...@mdenkmann.de> wrote:
>
>> In windowWillUseStandardFrame:defaultFrame: in a subclass of NSDocument
>> (which is also the delegate of it's window) I want to set the window to just
>> contain a certain line.
>>
>> - (NSRect)windowWillUseStandardFrame:(NSWindow *)sender
>> defaultFrame:(NSRect)defaultFrame
>> {
>> // myTextView is an NSTextView inside a scroll view, which is the
>> sole window content
>>
>> NSString *mySpecialLine = @"... something...";
>> NSDictionary *typingAttributes = [ myTextView typingAttributes ];
>> NSFont *typingFont = [ typingAttributes objectForKey:
>> NSFontAttributeName ];
>>
>> NSSize oneSize = [ mySpecialLine sizeWithAttributes: typingAttributes
>> ];
>> // this does not work - it always uses printer fonts even if
>> myTextView does not.
>
> I think the basic problem is in assuming that the Cocoa text system and the
> string drawing methods use the same layout. That assumption is not safe. If
> you need to know the metrics of a line as it appears in a NSTextView, you
> need to ask the NSLayoutManager for the metrics of that specific line
> fragment; you cannot ask the attributed string itself, because its
> calculations are likely to be different. For one thing, the string drawing
> methods might use a different typesetter compatibility setting.
Ok.
So I came up with this:
- (CGFloat)widthOfTextViewLike: (NSTextView *)oldTextView withLine: (NSString
*)fittingLine;
{
NSDictionary *typingAttributes = [ oldTextView typingAttributes ];
NSFont *typingFont = [ typingAttributes objectForKey:
NSFontAttributeName ];
NSLayoutManager *oldLayoutManager = [ oldTextView layoutManager ];
BOOL usesScreenFonts = [ oldLayoutManager usesScreenFonts ];
CGFloat big = 1e4;
NSTextView *dummyTextView = [ [ NSTextView alloc ] initWithFrame:
NSMakeRect(0,0, big, big) ];
[ dummyTextView setString: fittingLine ];
[ dummyTextView setFont: typingFont ];
[ dummyTextView setMinSize: NSMakeSize(1, big) ];
[ dummyTextView setHorizontallyResizable: YES ];
NSLayoutManager *dummyLayoutManager = [ dummyTextView layoutManager ];
[ dummyLayoutManager setUsesScreenFonts: usesScreenFonts ];
[ dummyTextView sizeToFit ];
NSRect frame = [ dummyTextView frame ];
[ dummyTextView release ];
return frame.size.width;
}
If there is a better (more efficient) way, please let me know.
Kind regards,
Gerriet.
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