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Re: canvas API changes to drive magnification

From: Richard Schwerdtfeger <schwer@us.ibm.com>
Date: Tue, 9 Mar 2010 08:56:02 -0600
To: David Bolter <david.bolter@gmail.com>
Cc: Charles McCathieNevile <chaals@opera.com>, cooper@w3.org, cyns@exchange.microsoft.com, Steven Faulkner <faulkner.steve@gmail.com>, Frank Olivier <franko@microsoft.com>, janina@rednote.net, jcraig@apple.com, "public-canvas-api@w3.org" <public-canvas-api@w3.org>
Message-ID: <OFC45032EB.68E50D28-ON862576E1.00515F16-862576E1.005208E8@us.ibm.com>

David,

Good pickup. I believe the author should be responsible for drawing the
caret. The canDrawCustom argument is left over from Hixie's proposal and I
agree that is a bit confusing. I have not seen a convention whereby the
system draws the caret - has anyone else? I left it in. Do you think it is
possible for the browser to draw a default caret?  I can see a focus ring
being doable but for caret I have my doubts.

Rich

Rich Schwerdtfeger
Distinguished Engineer, SWG Accessibility Architect/Strategist


                                                                           
             David Bolter                                                  
             <david.bolter@gma                                             
             il.com>                                                    To 
                                       Richard                             
             03/09/2010 08:34          Schwerdtfeger/Austin/IBM@IBMUS      
             AM                                                         cc 
                                       cooper@w3.org, janina@rednote.net,  
                                       Charles McCathieNevile              
                                       <chaals@opera.com>,                 
                                       cyns@exchange.microsoft.com, Steven 
                                       Faulkner                            
                                       <faulkner.steve@gmail.com>, Frank   
                                       Olivier <franko@microsoft.com>,     
                                       jcraig@apple.com,                   
                                       "public-canvas-api@w3.org"          
                                       <public-canvas-api@w3.org>          
                                                                   Subject 
                                       Re: canvas API changes to drive     
                                       magnification                       
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           




Hi Rich, all,

I just read the proposal at
http://www.w3.org/html/wg/wiki/ChangeProposals/canvasaccessibility

I don't feel like I fully understand the proposal. Take the case for canvas
drawn text. Each time the user presses the right arrow, does the author
catch that event and call e.g. drawFocusRing(myTextBox, 10, 5, true, true)?

I want to understand who is responsible for drawing the caret or focus ring
in various examples.

http://www.paciellogroup.com/blog/misc/canvas/2dcontext-caret.html is
really hard to understand (maybe because of typos). For example I don't
understand how to parse this sentence: " If the given element is focused or
is a descendant of the focus element, and isCaret is true, canDrawCustom
argument is true draws a caret following the platform conventions for
carets." -- Who draws?

cheers,
David

On 08/03/10 7:17 PM, Richard Schwerdtfeger wrote:


      I would like to have people review Steve and my proposal to the
      canvas
      accessibility API to address focus and caret tracking for the next
      canvas
      meeting on the 15th so that we can take this to the task force for
      approval. David, Frank, Cynthia, James, and Charles I would very much
      like
      your feedback by the next call.

      http://www.w3.org/html/wg/wiki/ChangeProposals/canvasaccessibility

      Thanks,
      Rich

      Rich Schwerdtfeger
      Distinguished Engineer, SWG Accessibility Architect/Strategist






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Received on Tuesday, 9 March 2010 14:57:17 UTC

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