Re: mouse-grid selection for navigation [was: Re: Updated SVG comments document]

At 1:16 PM -0500 11/29/04, david poehlman wrote:
>Al,  The quadrant approach can be layered to achieve the same effect

Please explain.

I can understand how one can walk the cells with directional commands
(probably four) *if* the UA has constructed the cells out of the bounding
box of the currently selected cell.

On the other hand, I don't believe that the method Will proposed where
it just leaps to the nearest enabled element in the octant indicated by
the command can be made hierarchical without author assistance to
stratify or prioritize the destinations.


>  but the
>limits you'll place on navigation with "mouse grid" will be that not all
>plots will be equally devidable so you still need some incramental nav
>Johnnie Apple Seed
>----- Original Message -----
>From: "Al Gilman" <>
>To: "Jon Gunderson" <>; <>
>Sent: Monday, November 29, 2004 1:09 PM
>Subject: mouse-grid selection for navigation [was: Re: Updated SVG comments
>At 1:25 PM -0600 11/24/04, Jon Gunderson wrote:
>>I have updated the WAI SVG 1.2 comments document to add
>>sections on benefits to people with disabilities. Comments or
>>edits can be sent to the list.
>I have some local-edit suggestions that I'll put in a following mail.
>There is one issue that I consider major enough so that I don't want
>to just slip it in or move ahead without giving the UAAG and PF
>participants some opportunity to react.
>This has to do with the keyboard navigation model for visual scenes.
>There is a suggestion in the current draft for incremental navigation
>by geometrical octants.  Comparable to the points of an eight-point
>compass rose: North, North-East, East, etc.
>But in voice command there is a precedent for another way of selecting
>something in a scene without a pointing device.  This is I believe called
>'mouse grid' in at least one tool.
>The rectangular canvass is divided into [nine] equal parts.
>The user selects one of these.
>The selected part is subdiivided again into a similar set of sub-parts.
>And so on until there is only one focusable item in the remaining
>region.  This is not only selected but gets the focus.
>The user can then activate the methods of this object.
>To my way of thinking this is a mode of operation that belongs ahead
>of any incremental navigation by quadrants as something for the
>mainstream players to support for all users (not relying on AT add-ons)
>as a means of ensuring access.
>It affords a systematic way to reach any 'enabled element' to use the
>UAAG term.  And it builds a breadcrumb trail that one can understand
>without seeing the visual display.
>It is definitely quicker with vision, but it has the advantage over
>navigation by quadrants in that it provides a comprehensible way to
>sweep through all enabled elements in the scene by parts.
>Think of this as a repair structure for a scene constructed with no marked
>or discernable structure.
>Did the User Agent group consider this functionality and reject it for some
>Should we add this as an option or another suggestion alongside incremental
>navigation by quadrants?
>[Note: there is [four?] directional navigation to author-designated elements
>CSS for the TV delivery context.  What we actually do in SVG should make
>sense as compared to the way that works, even if not identical.]
>>Jon Gunderson, Ph.D., ATP
>>Coordinator of Assistive Communication and Information Technology
>>Division of Rehabilitation - Education Services
>>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
>  >WWW:

Received on Monday, 29 November 2004 18:36:56 UTC