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Re: Fw: Draft Revisions to Canvas 2D Context API to drive magnification

From: Steven Faulkner <faulkner.steve@gmail.com>
Date: Tue, 1 Jun 2010 18:55:46 +0100
Message-ID: <AANLkTimAFDYyjMXIe6qozCy4Yrapwn1FLJb9Gbsm5zv8@mail.gmail.com>
To: Richard Schwerdtfeger <schwer@us.ibm.com>
Cc: Maciej Stachowiak <mjs@apple.com>, Frank Olivier <franko@microsoft.com>, Janina Sajka <janina@rednote.net>, "public-canvas-api@w3.org" <public-canvas-api@w3.org>, public-html-a11y@w3.org, david.bolter@gmail.com
hi rich,
editorial: remove second 'is'

"If the drawCustomRing argument is true, then the author is wishes to draw a
custom focus ring around the element in which case the user agent will only
draw the focus ring if the user has specifally configured the operating
sytem to draw focus rings in a particular manner in which case the author
would not be approved to draw a custom focus ring. (For example, high
contrast focus rings.) "

the rest looks good to me.

On 29 April 2010 22:25, Richard Schwerdtfeger <schwer@us.ibm.com> wrote:

>  Hi Maciej,
> I have not heard back from Apple on this proposal. Please take a look at
> the proposal (attached HTML file) and let me know if this will work for the
> Mac. I think I addressed your issues and would like your feedback.
> We have an MSAA API call on Windows which we can call to set the Caret
> Position so that a magnifier can can follow it which can be used by IE and
> FF.
> I don't know if you have a similar API for the Mac where the selection
> position could drive the magnifier.
> Thanks,
> Rich
> Rich Schwerdtfeger
> CTO Accessibility Software Group
> ----- Forwarded by Richard Schwerdtfeger/Austin/IBM on 04/29/2010 04:17 PM-----
>     *Richard Schwerdtfeger/Austin/IBM@IBMUS*
>             Sent by: public-canvas-api-request@w3.org
>             04/11/2010 06:49 PM
> To
> Frank Olivier <franko@microsoft.com>, Janina Sajka <janina@rednote.net>, "
> public-canvas-api@w3.org" <public-canvas-api@w3.org>, Steven Faulkner <
> faulkner.steve@gmail.com>, public-html-a11y@w3.org, david.bolter@gmail.com
> cc
> Subject
> Draft Revisions to Canvas 2D Context API
> Sorry it took so long for me to get this draft out. Too much traveling
> going on. Please take a look and provide feedback.
> The edits reflect:
> - Separate caret/selection from drawFocusRing *
> http://lists.w3.org/Archives/Public/public-html/2010Mar/0502.html*<http://lists.w3.org/Archives/Public/public-html/2010Mar/0502.html>.
> The Mac does not support caret tracking during selection so this needed to
> be allotted for.
> - Expose the caret blink rate via 2D canvas API. Frank indicated Windows
> has a 500 millisecond defult blink rate a. Carl Carlson (Apple) indicated a
> default blink rate of 560 milliseconds. I provided information for authors
> regarding average default blink rates should the value returned be negative
> 1.
> - Change the name of canDrawCustom and clean up its definiton which
> according to Maciej is "want to draw custom unless Special Focus Ring
> Setting is in Effect" *
> http://lists.w3.org/Archives/Public/public-html/2010Mar/0363.html*<http://lists.w3.org/Archives/Public/public-html/2010Mar/0363.html>
> David Bolter: From the Firefox perspective we still need to see that the
> caret/selection location can be properly mapped to the accessibility API as
> is. Currently, the caret position is a logical one in IA2 and I believe the
> caret pixel position is calculated from the character font offset and the
> bounding rectangle of the text. We may need to move the system caret. I am
> trying to find the old Windows API for that.
> Frank: Please see if we can map the pixel position accurately, when
> provided, from the accessibility API. Windows used to have an MSAA
> notification for driving a magnifier based on screen position. I don't know
> if this is still used when using UIA Express.
> Maciej or James: Same question for Mac regarding the caret/selection
> position.
> *
> (See attached file: 2dcontext10-Apr-11.html)*
> Rich Schwerdtfeger
> CTO Accessibility Software Group*(See attached file:
> 2dcontext10-Apr-11.html)*

with regards

Steve Faulkner
Technical Director - TPG Europe
Director - Web Accessibility Tools Consortium

www.paciellogroup.com | www.wat-c.org
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Received on Tuesday, 1 June 2010 17:56:46 UTC

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