W3C home > Mailing lists > Public > w3c-wai-ua@w3.org > October to December 1998

Re: on events with different UA ???

From: Daniel Dardailler <danield@w3.org>
Date: Thu, 15 Oct 1998 15:13:49 +0200
Message-Id: <199810151313.PAA19234@www47.inria.fr>
To: Al Gilman <asgilman@access.digex.net>
cc: hbingham@ACM.org (Harvey Bingham), w3c-wai-ua@w3.org

> Good questions.  Here are some related thoughts.

More data, more souvenirs...

Back when I was working on implementing the X Window and Motif
toolkit, we had defined a level of event notification that would allow
application to transparently support keyboard or mouse control in all
widgets (i.e. UI WIndow obJECTS).

If you take any good Motif programming book, you'll find definitions
for things like

osfCopy
osfCut	
osfPaste
osfClear
osfEscape
osfPageUp
osfPageDown
osfPageRight	
osfActivate	
osfMenuBar	
osfEndLine
osfBeginLine
osfSelect
osfUndo		
osfCancel
osfHelp		
osfSelectAll	
osfDeselectAll	
etc

All these "virtual keysym", in our jargon, were meant to provide a
layer of abstraction that permitted programs to stay independent of
the device. In order to really be independent, the program "callbacks"
had to follow some discipline and not dig into the guts of the real
event that was behind this virtual notification.

In retrospect, I think we should have made it impossible for the
program API to access the real event details.

Anyway, as Web pages involving DTHML are more and more ressembling the
imperative coding practices of the past (vs. the declarative UI
practives HTML FORM had introduced), this technology is likely to find
a new use.
Received on Thursday, 15 October 1998 09:14:06 GMT

This archive was generated by hypermail 2.2.0+W3C-0.50 : Tuesday, 27 October 2009 06:48:38 GMT