Re: Keyboard Navigation For Document Exploration In SVG 1.2

Will,

I updated the draft to include your directional navigation
proposal.  Sorry I didn't have it in the first draft.

http://www.w3.org/WAI/UA/2004-11-wai-comments-svg12.html

Jon


---- Original message ----
>Date: Mon, 22 Nov 2004 20:38:55 -0000
>From: "Will Pearson" <will-pearson@tiscali.co.uk>  
>Subject: Keyboard Navigation For Document Exploration In SVG
1.2  
>To: <wai-xtech@w3.org>
>
>   Hi;
>    
>   At the moment there's no clear indication within the
>   spec that document exploration should be made
>   available through a ua's keyboard interface.  Whilst
>   most people will be able to visually explore the
>   image, this won't be possible for some users, and
>   may not be possible for others.  Therefore, I would
>   like to suggest that some form of navigation between
>   container elements and graphic elements be
>   recommended as a guideline for ua developers.  This
>   should facilitate exploration of the document away
>   from any elements with 'focusable' set to true, or
>   active elements with 'focusable' set to auto.
>    
>   Ideally, this would be based on spatial direction,
>   thus allowing the user to build up a mental model of
>   the spatial relationships between elements.
>    
>   The spec already makes provision for a range of
>   alternative pointing devices, through DOM 3 I think,
>   but I think we need something a bit more granular
>   than a pixel by pixel movement typically offered by
>   pointing devices.  The main reason for this, is that
>   the HCI task analysis for moving two points require
>   the user to know where the pointer is in relation to
>   the target.  This can be done with speech, and
>   there's an event in JAWS to handle this, but having
>   experimented with this on a small number of users,
>   doing the math necessary to work out the
>   relationship between pointer and target raised the
>   cognitive workload, as measured by the NASA-TLX
>   test, quite significantly.
>    
>   So, I propose the following eight keys to facilitate
>   document exploration within a ua:
>
>                              I.       Up (337.5º -
>   22.5º)
>
>                            II.      Diagonally up and
>   right (22.5º - 67.5º)
>
>                           III.       Right (67.5º -
>   112.5º)
>
>                        IV.       Diagonally down and
>   right (112.5º - 157.5º)
>
>                          V.       Down (157.5º -
>   202.5º)
>
>                        VI.       Diagonally down and
>   left (202.5º - 247.5º)
>
>                       VII.       Left (247.5º -
>   292.5º)
>
>                     VIII.      Diagonally left and up
>   (292.5º - 337.5º)
>
>    
>
>   Each of these keys will be responsible for moving to
>   the nearest element within a 45º arc, as listed
>   above.
>    
>   Will


Jon Gunderson, Ph.D., ATP
Coordinator of Assistive Communication and Information Technology
Division of Rehabilitation - Education Services
MC-574
College of Applied Life Studies
University of Illinois at Urbana/Champaign
1207 S. Oak Street, Champaign, IL  61820

Voice: (217) 244-5870
Fax: (217) 333-0248

E-mail: jongund@uiuc.edu

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WWW: http://www.staff.uiuc.edu/~jongund

Received on Monday, 22 November 2004 21:28:51 UTC