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swillits/allowsDefaultTighteningForTruncation.md

Last active December 2, 2016 01:11
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NSAttributedString drawing squeezing broken -- allowsDefaultTighteningForTruncation
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allowsDefaultTighteningForTruncation.md 
Natural attrStr.size is (width = 1578, height = 15)

NSRect stringRect = ...
[attrString drawWithRect:stringRect options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingTruncatesLastVisibleLine];

Drawn with size {500, 60} works as expected (wraps, no squeezing):

Drawn with size {500, 15} squeezes which is probably wrong, but truncates which is right:

Drawn with Monaco font and size {500, 15} it starts to squeeze ridiculously:

{500, 15} but no NSStringDrawingTruncatesLastVisibleLine, and it's better:

But I want the truncated line…

Answer!

Set allowsDefaultTighteningForTruncation to NO on the paragraph style applied to the whole attributed string.

See: https://developer.apple.com/library/prerelease/content/releasenotes/AppKit/RN-AppKitOlderNotes/index.html#10_11DynamicTracking

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