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- Path: sparky!uunet!usc!sdd.hp.com!mips!apple!cambridge.apple.com!cornell@freya.cs.umass.edu
- From: cornell@freya.cs.umass.edu
- Newsgroups: comp.lang.lisp.mcl
- Subject: Knowing when a buffer is modified, when point is moved, ...
- Message-ID: <9207281737.AA03521@giane.cs.umass.edu>
- Date: 28 Jul 92 17:37:46 GMT
- Sender: info-mcl-request@cambridge.apple.com
- Lines: 38
- Approved: comp.lang.lisp.mcl@Cambridge.Apple.C0M
- Original-To: info-mcl@cambridge.apple.com
-
- Howdy. I am building a mechanism that displays editable text and
- non-editable textual representations of objects in a FRED buffer. The
- non-text reps show in a different font to disginguish them from
- editable text. I have two issues:
-
-
- 1) To insert text in the proper style I thought I'd use
- buffer-insert-with-style, which takes a style vector. However, it
- seemst the only way to get a style is via buffer-get-style, which
- assumes I've already set the style! I'm now using buffer-set-font-spec
- then buffer-insert to simulate a buffer-insert-with-font-spec, which
- is really what I want. Would someone please tell me the accepted way
- to do this?
-
-
- 2) I need *general* ways to be informed when certain editing
- conditions take place:
-
- a) when the cursor mark is moved within a non-editable
- range (which I know via start and end marks I create for each
- non-editable item) so I can extend the selection to cover the entire
- object.
-
- b) when non-editable text is deleted so I can delete the
- internally-stored objects corresponding to the deleted text.
-
- My question here is: Are there a few functions that I can tap that
- tell me when these conditions happen? I thought move-mark and
- buffer-delete might be them but they're non-generic functions so I'd
- have to advise them, which means my functions get called whenever they
- take place (often). I'm also thinking my start and end marks'
- positions might tell me if their text has been deleted. Anyone have
- a good solution?
-
-
- Sincerely,
-
- matt
-