- From: Joseph Scheuhammer <clown@utoronto.ca>
- Date: Tue, 22 Apr 2008 11:37:41 -0400
- To: "Wlodkowski, Thomas" <Thomas.Wlodkowski@corp.aol.com>
- CC: Aaron M Leventhal <aleventh@us.ibm.com>, David Bolter <david.bolter@utoronto.ca>, wai-xtech@w3.org, wai-xtech-request@w3.org
Tom wrote: > Feel free to propose a keyboard behavior and then join a style guide > call held Tuesdays at noon Eastern and we will discuss. Here is a first draft of a proposal. Basically, I've taken the key strokes for a "single-thumb" slider and adapted it for a dual thumb slider. The keystrokes for the single thumb slider are: http://dev.aol.com/dhtml_style_guide#slider Two Thumb Slider - Tab to the slider's low-range thumb. - Second tab moves to high-range thumb. - Third tab away from slider. - Shift-tab moves back to low-range thumb if focus is on the high-range thumb. - With focus on a thumb: - Right and Up Arrows increases the value of the slider constrained by the value of the other thumb. - Left and Down Arrows decrease the value of the slider constrained by the value of the other thumb. - Home and End move to the minimum and maximum values of the slider constrained by the value of the other thumb. - Page Up and Page Down optionally increment or decrement the slider by a given amount, constrained by the value of the other thumb. - Note: Focus is placed on one of the thumbs of the slider. - Note: The two thumbs are in the focus order. - Note: Localization for right to left languages may wish to reverse the left and right arrows. A couple (non-keyboard) problems: First, how does the system communicate to the user which thumb has focus? Visually, this is easy; however, it's not clear how to do it for non-visual users. Secondly, the value of the slider is not a single number, but a range. Is there a common way to present a range? If the user conceives of the dual thumb slider as a pair of separate but linked single thumb sliders, then the keyboard behaviour remains as outlined above. The two sliders' values together define the range (the value of the analogous two-thumbed slider). Perhaps the non-visual presentation is much that same as that for a single slider, taking into account that the second slider/thumb constrains the range/value of the system. -- ;;;;joseph 'This is not war -- this is pest control!' - "Doomsday", Dalek Leader -
Received on Tuesday, 22 April 2008 15:38:54 UTC