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- From: david@breslau.ap.mchp.sni.de (David Smyth)
- Newsgroups: comp.windows.x
- Subject: Re: Opinion of O'Reilly Guides to the X Window System (UIL)
- Date: 17 Nov 1992 08:47:03 GMT
- Organization: Siemens-Nixdorf AG
- Lines: 97
- Message-ID: <1eabi7INN7hs@horus.ap.mchp.sni.de>
- References: <BwA8Du.4yw@dcs.ed.ac.uk> <2AE31AD9.2711@deneva.sdd.trw.com> <1992Nov12.013019.920@mjs486.uucp>
- NNTP-Posting-Host: breslau.ap.mchp.sni.de
- Keywords: UIL, Motif
-
- martin@mjs486.UUCP (Martin J. Schedlbauer) writes:
- >helding@pooh.sdd.trw.com (steve helding) writes:
- >>pdc@dcs.ed.ac.uk (Paul Crowley) writes:
- >>
- >>>UIL seems pretty well universally acknowledged to be unusable, and
- >>>inferior in every respect to other application builders such as the free
- >>>Wcl 2.0. I guess O'Reilly are going for completeness, but I can see no
- >>>reason why any but a very few people might want to know how to use it.
- >>
- >>Being somewhat new to X and Motif I was wondering about the assertion made
- >>above. We use Builder Xcessory which optionally generates UIL. UIL seems
- >
- >I have recently developed an advanced Motif course that teaches UIL in
- >detail. Although I've run into a few attendees that don't much care for UIL,
- >the majority of attendees appreciate the simplicity of UIL. ...
- >
- >I've also found that for those folks that program in a language other than
- >C (e.g. Ada) that they prefer UIL. They don't have to learn the Ada-Motif/X
- >bindings.
- >
- >I suspect much of the dislike for UIL stems from ...
-
- First, thanks for the complement, Paul.
-
- Wcl and UIL are, in many ways, very similar. The basic idea of both is
- to specify the look and feel of the user interface in a form
- independent of the logic of the application.
-
- Wcl is a thin layer over Xrm, while UIL is a complete "replacement"
- for Xrm - but Xrm is not replaced, it still exists and still is
- used IN ADDITION TO UIL.
-
- Xrm is loaded during XtInitialize, and is searched when each widget
- is created. Xt always fetches all widget resources from Xrm when
- each widget is created.
-
- Wcl simply also fetches the widget types, and the widget heirarchy
- from Xrm. For example:
-
- foo.wcCreate: SomeWidgetClass
- *foo.wcPopups: dialog1 dialog2
- *foo.wcChildren: manager1 manager2 buttonA buttonB
-
- UIL, on the other hand, DUPLICATES everything Xrm does in addition to
- adding widget type and heirarchy specifications. Xrm is not
- eliminated: Xt and the widgets still access the Xrm database. Whether
- or not the resource value is specified in resources (as one would do it
- using Wcl) or is set by UIL or by arguments passed to XtCreateWidget(),
- the resource values are still fetched from the resource database. The
- UIL values, or the arguments passed to XtCreateWidget() simply override
- the resource values.
-
- Programmers still need to know about Xrm. Users still need to know about
- Xrm. But with UIL, programmers ALSO need to learn about UIL.
-
-
- The worst part is that not only does UIL simply add (significantly)
- to the run-time overhead, but it also adds to the hassle people must
- endure to use new widgets. Again, the difference between UIL and
- Wcl is that UIL duplicates information and capability, Wcl simply
- uses what it already there. Take a widget: Wcl only needs the name
- and the widget class pointer. Period. UIL needs to know about all
- the resources and their types. This is silly, because the Widgets
- already know their resources and types. Wcl lets the widgets get
- the right types from the Xrm database, UIL needs to do everything the
- widget+Xrm+converters already do.
-
- This is an important point. I doubt if anyone can do anything serious
- without special widget classes. At least, one must deal with new releases
- of widget classes during the life of the application.
-
- > ... My course addresses those issues and quite often
- >former UIL-bashers are won over (or at least they tolerate my teaching of
- >UIL :)
-
- An interesting thing happened last year about this time. Some guy
- attended a Motif programming course where they presented UIL. He
- figured we should not use some home-brew Wcl thingy, we should use the
- standard UIL. He organized a meeting with organizational Brass to get
- a mandate to stop Wcl and get everyone to use UIL. He came in and
- asked me about Wcl. I said "Love to help, but I'm busy this week -
- here's the distribution on floppy, build it and play with it." I heard
- nothing more until the meeting...
-
- The next Monday morning when we had this meeting, he had become (and
- still is) a big booster for Wcl. I had to stand up for UIL just so it
- did not look TOO bad!
-
- >P.S. Please watch for my UIL tutorial at the X conference.
-
- ... and my tutorial and BOF on Wcl
-
- ---------------------------------------------------------------------------
- David E. Smyth David.Smyth@ap.mchp.sni.de
- Object/X Researcher AP 154, Carl-Wery-Str 22, Munich 83 Germany
- Research Grant provided by Esprit Investments Ltd,
- major sponsor Siemens Nixdorf Informationssysteme AG
-