Hello all, In the episode of Late Night Cocoa on the text system, [ http://www.macdevnet.com/index.php/shows/latenightcocoa/37-latenightcocoa/93-lnc005 ] Juan Pablo Claude described a setup with multiple NSLayoutManagers editing text from the same NSTextStorage and then said, off-hand, that you might do this if you wanted to display the same text with different fonts. I am curious if anyone could discuss how this might be done: displaying the same underlying attributed string, but formatting it before the NSLayoutManager tries to lay it out and formatting it back when the NSTextView sends back changes. I cannot find specific information on subclassing NSLayoutManager to make these sorts of changes.
(I know there is an Apple demo [TextViewConfig, http://developer.apple.com/samplecode/TextViewConfig/index.html] which shows multiple layout managers, but these both render the exact same attributed string (except that one view has been essentially zoomed to twice the size). I am curious if it is possible to actually change temporary attributes in one LayoutManager but not the other, and then change them back appropriately before sending events to the NSTextStorage.) End technical discussion ---- Begin back story for those interested: I am a relatively new Cocoa developer working on an open-source project for academics. I recently spent considerable time working on a web-based version of this application before learning that the hardest part was technically infeasible because of some limitations in HTML's designmode. In starting with Cocoa, I will be happy if the project and required learning takes many years, so long as there is an answer in advance to this one difficult question. The application is an editor for a specific subset of the TEI XML guidelines for encoding literary works and scholarly commentaries on them. The underlying data maps very nicely into an attributed string, because it is a single text divided up into separate 'series' (main text, footnotes, cross-links) The series are all anchored together, but would best be displayed apart, with first the main text, then each series of notes. I believe the easiest way to do this would be to have a single underlying NSTextStorage, to attribute every range of text to one series, and then to create various subclasses (or formatters) for NSLayoutManager that each display only text in one particular series. I suspect this could also be done with a custom Typesetter and the method setNotShownAttribute:forGlyphAtIndex:, but am curious if there is a more general hook to set attributes on the string before layout. Thank you, Adam Solove _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to [EMAIL PROTECTED]
