Re: NSLayoutManager question
Re: NSLayoutManager question
- Subject: Re: NSLayoutManager question
- From: Paul Bayley <email@hidden>
- Date: Wed, 20 Feb 2002 12:24:36 -0800
At 9:57 AM -0800 2/20/02, Douglas Davidson wrote:
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On Tuesday, February 19, 2002, at 05:56 PM, Paul Bayley wrote:
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> I wish to change the text area selection behavior of a Cocoa application and I'm a bit lost. I believe this is handled by NSLayoutManager but not certain. I'm sure somebody will correct me if I'm wrong.
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> The behavior I wish to change is when selecting text via dragging I do not want to select the trailing hard return (linefeed). The current behavior selects the linefeed when selecting right or down. I do not wish to change the triple-click behavior which selects a line including the trailing linefeed.
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> I also want to create a click-and-hold gesture as well as a drag-the-selection gesture, but those are secondary concerns.
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> It seems to me, browsing Apple's documentation, that the selection behavior is performed by NSLayoutManager. However I'm not quite sure how to alter the behavior of NSLayoutManager to my liking.
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No, this behavior is determined by NSTextView, primarily in its mouseDown: method. NSTextView is the view, NSTextStorage the model (or part of it), and NSLayoutManager the controller; this is view behavior. NSLayoutManager is consulted, primarily through glyphIndexForPoint:inTextContainer:fractionOfDistanceThroughGlyph:, and you could consider intervening there, but the primary responsibility lies with NSTextView. (glyphIndexForPoint:inTextContainer:fractionOfDistanceThroughGlyph: is not the right method to override, however; see the NSLayoutManager header for details.)
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Possibly someone else on the list has tried to do something like this before.
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Douglas Davidson
Nobody on this list has tried this.
I'm not clear what the selection process is then. I know NSTextView knows where the mouseDown occurs, but I thought it passed that information to NSLayoutManager so it could make the selection. For example if one document spans two views (like page 1+2) how would NSTextView know what to select? I thought that each view would report each end of the selection to NSLayoutManager which would perform the selection (not only visually but also creating a text range).
So what do I override?
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