home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: gnu.misc.discuss
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!darwin.sura.net!uvaarpa!cv3.cv.nrao.edu!cv3.cv.nrao.edu!pshannon
- From: pshannon@iapetus.cv.nrao.edu (Paul Shannon)
- Subject: RFC: using Texinfo and InterViews for a context-sensitive help program
- Message-ID: <PSHANNON.92Dec14144048@iapetus.cv.nrao.edu>
- Sender: news@nrao.edu
- Organization: nrao
- Distribution: gnu
- Date: Mon, 14 Dec 1992 19:40:48 GMT
- Lines: 65
-
- We'd like to get comments on a small project we're about to begin. By
- "comments" I mean anything like
-
- 1. "this is a great idea, please let us use the code when you're done"
- 2. "this was done months ago, look at anon ftp site xxx.yyy.zzz for
- a copy"
- 3. "this is a stupid idea, for these reasons....."
-
-
- A Context-sensitive help program, based upon
- Texinfo and InterViews
-
- By using the GNU project's Texinfo for documentation, we're able to have a
- single source file for printed manuals and and on-line help. So there's
- two ways to read the Texinfo source: print it out, or use emacs in info
- mode. We want to add a third way: a program with a graphical user
- interface that responds to ipc requests (over a socket, for instance),
- by displaying a particular node in the file. Once this node is displayed,
- the user can navigate using the normal info keyboard commands (m,d,u,....)
- and with corresponding gui widgets as well (menus, buttons, and sliders).
-
- This gui program, sensitive to ipc requests, will allow us to provide
- context-sensitive help to our users: any of our application programs
- that knows the protocol (socket number, node names, info navigation commands)
- can popup the Texinfo viewer, at a particular node, at will.
-
- In time we'd like to add printing, bookmarks, different fonts, and perhaps
- the ability to display postscript.
-
- We propose to use the C++ gui toolkit InterViews. IV has many strengths:
-
- 1. written in C++, with classes that are easily adapted to
- the model-view-controller approach to gui design
- 2. public domain source
- 3. isolation of X and OS related code
- 4. may become the standard X consortium C++ toolkit
-
- and some weaknesses
-
- 1. few examples to learn from
- 2. scant documentation
- 3. unstable design: though version 3.0 brought glyphs, and 3.1
- introduced object creation kits, these rest uneasily among
- classes left over from the earlier 2.6 design.
- 4. some functionality from the X Intrinsics is not
- available: XtWorkProc, for example, allows the programmer
- to install a task to run whenever no events are pending;
- this is difficult to do in IV.
-
- There's an InterViews 2.6 application, ivinfo, available on the ftp
- archive at interviews.stanford.edu, which contains some code we'd
- either use directly or learn from.
-
- We plan to distribute the code for our larger project (aips++, an image
- processing tools for radio astronomy) under the gnu copyleft agreement.
- We would do the same for the context-sensitive help program as well.
-
- Any comments, criticisms or suggestions?
-
- Paul Shannon
- pshannon@nrao.edu
- National Radio Astronomy Observatory
-
-
-
-