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(as you type) spell checking of an attributed string
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(as you type) spell checking of an attributed string


  • Subject: (as you type) spell checking of an attributed string
  • From: "email@hidden" <email@hidden>
  • Date: Mon, 29 Jun 2009 18:31:13 -0700

in my app, i use a NSTableView to let the user specify headers/footers for use in reports. a row in the table corresponds to a single header/footer line. a single header/footer line is an NSAttributedString, and i allow the user to specify the text and font and size and text color. additionally, the user can select "tags" from a popup to insert tags in the line that get evaluated when the report is printed. (these tags correspond to things like the print date, user's name, report name, etc.) my model (persistent copy) of a header/footer line stores these tags as a 4 character sequence: %XX% (where XX corresponds to the particular tag). for display in the table, i replace the 4 character sequence with:
\x0001<EXPANDED VALUE>\x0001
ie, a unicode "1", a string meaningful to the user, a unicode "1". this expanded sequence is given its own custom attribute and the string is displayed with a unique background color. (i suspect this is sorta like a token string, but my implementation pre-dates my knowledge of NSTokenField).


this has worked well for me, and i successfully deal with my tags as words as far as selection and drag and drop.

now i'd like to be able to support spell checking when the user is specifying header/footer lines. and i'd like to be able to support both manually requested spell checking and continuous/as-you-type spell checking. and when performing either form of spell checking, a tag should be treated as a series of space characters.

as i already have my own custom field editor for the table, i believe by overriding of -[NSText checkSpelling], i can get user requested spell checking to work. i would simply perform the appropriate call to NSSpellChecker to check a string in which i've replaced my tags with spaces, and i could set the spell state and selection as needed.

but i can't think of anyway to have continuous spell checking treat my tags as a sequence of spaces. can anyone (Mr. Davidson? :-)) offer some suggestions?

one thing i thought of thus far is to have the spell checker learn and unlearn my sequences whenever my custom field editor becomes the first responder and the user has requested continuous spell checking. this almost works, but fails if the user doesn't have a word break character between my tag and his/her typing.

thanx for any help/advice/suggestions/any thing,
ken
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