perpendicular split pane control (3 panes: 1 vertical, 2 horizontal)

at yesterday's ARIA workgroup call, we discussed the issue of "Split Pane 
control implementation"

at first, split pane control was addressed as a binary choice:

1. expand/contract left-right, or
2. expand/contract up-down

i observed that in GUI systems, applications, such as GUI FTP managers, 
email clients, calendaring software, authoring tools, etc. often have 2 
splits - one vertical and another horizontal

al gilman noted that on the mac side of things, that this situation is 
part of the default presentation of applemail -- the left bar has 
the top segment of the right column is unfoldable, the bottom pane splits 
horizontally into a preview and message list -- noting that this 
a viable use case for 3 heirarchies

al elaborated on the applemail example:

     the top thing is not unfoldable. It is a preview pane. The folder 
     listing appears in the top big part of the right hand column, the 
     preview pane contains the preview of message;  It is clear that 
     it is dividing the width into two columns. The second is 
     splitting the right hand column into an upper and lower part

when asked by RichS if i as a blind user would prefer direct control of 
the split pane or have the pane delimiters included in the tab order, i 
replied that in the ideal world, i would leave it to the user to choose --
for some it will be easier to accomplish resizing panes with direct 
control, but some users may prefer or require the resizing widgets to be 
in the tab navigation order...  in the real world, however, direct 
control/acces to the slider outside of normal navigation order is 
probably the best solution...  i asked if this was something which should 
be addressed at the DHTML call today, and so the decision was made to use 
slider for split pane control at the moment, but to discuss the 
ramifications of perpendicular resizing and possible keyboard 
implementation thereof with the DHTML group...

al noted that if we aren't careful, an application may end up pointing at 
3 things with selection of the first container, and so it was decided to 
add this as an issue for the upcoming PF face2face meetings in venice, 
after soliciting the opinions of the DHTML group

as al summed up the state of the spliter proposal -- one can use slider, 
but what does that mean in terms of keyboard navigation, placement, 

would it be possible to discuss this at today's meeting?

thank you and apologies for the short notice,

CONSERVATIVE, n.  A statesman who is enamored of existing evils,
as distinguished from the Liberal, who wishes to replace them 
with others.         -- Ambrose Bierce, _The Devil's Dictionary_
             Gregory J. Rosmaita,
  Camera Obscura:

Received on Tuesday, 12 February 2008 14:54:14 UTC