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Re: canvas API changes to drive magnification

From: David Bolter <david.bolter@gmail.com>
Date: Tue, 09 Mar 2010 11:00:56 -0500
Message-ID: <4B9670B8.7020206@gmail.com>
To: Richard Schwerdtfeger <schwer@us.ibm.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>
Hi Rich,

I don't know if I am against the canDrawCustom attribute, I just want to 
understand it better. Perhaps it is useful for interop with the usemap 
approach?

cheers,
David
On 09/03/10 9:56 AM, Richard Schwerdtfeger wrote:
> 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
>
>
>    
Received on Tuesday, 9 March 2010 16:30:10 UTC

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