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.
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