• Open Menu Close Menu
  • Apple
  • Shopping Bag
  • Apple
  • Mac
  • iPad
  • iPhone
  • Watch
  • TV
  • Music
  • Support
  • Search apple.com
  • Shopping Bag

Lists

Open Menu Close Menu
  • Terms and Conditions
  • Lists hosted on this site
  • Email the Postmaster
  • Tips for posting to public mailing lists
Re: Overwriting text in an NSTextView?
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Overwriting text in an NSTextView?


  • Subject: Re: Overwriting text in an NSTextView?
  • From: Douglas Davidson <email@hidden>
  • Date: Thu, 15 Jun 2006 10:52:59 -0700


On Jun 15, 2006, at 9:39 AM, Keith Blount wrote:

Is there a way to have letters overwrite one another
using the NSTextView text system? Eg., so that I could
merge a "g" with an "X" (in my emulator, I would like
it so that if the user goes back and types, instead of
the text getting inserted and moving text after it
forward, it will overwrite the old text). Not sure if
this is at all possible, but I'm sure I read somewhere
ages ago about something like this (probably imagining
it).


Well, usually this is something we try to avoid. :) You can, if you like, directly manipulate the glyphs in the layout manager--for example, inserting new glyphs at arbitrary locations in the text and arbitrary positions. You need to be a little careful about it, because it's easy to shoot yourself in the foot this way. You should think about how you want this to work in general, though--the Cocoa text system is based on taking a text document (NSTextStorage) and from it producing a set of glyphs and positions in the layout manager. Just how do you plan on representing your overstrikes in the text document?


If you represent them as characters, then maybe you can use a typesetter subclass to arrange the positioning you want--that would probably be the most robust way to do it. If the overstrikes are represented as attributes, then perhaps you don't need to insert glyphs in the layout manager--maybe you just need to do some extra drawing. I showed an example of something along those lines at WWDC in 2003, my "AnnotatedTextDemo". I can make that code available if you want it.

Douglas Davidson

_______________________________________________
Do not post admin requests to the list. They will be ignored.
Cocoa-dev mailing list      (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden


  • Follow-Ups:
    • Re: Overwriting text in an NSTextView?
      • From: Keith Blount <email@hidden>
References: 
 >Overwriting text in an NSTextView? (From: Keith Blount <email@hidden>)

  • Prev by Date: setSelectedTextAttributes not fully supported?
  • Next by Date: Re: Disallow edit for rows in NSOutlineView
  • Previous by thread: Overwriting text in an NSTextView?
  • Next by thread: Re: Overwriting text in an NSTextView?
  • Index(es):
    • Date
    • Thread