- From: David Bolter <david.bolter@gmail.com>
- Date: Thu, 29 Apr 2010 13:07:26 -0400
- To: Richard Schwerdtfeger <schwer@us.ibm.com>
- CC: 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
Hi Rich, I'm sorry this email got lost in my stack! I've replied to the part directed at me below: On 11/04/10 7:49 PM, Richard Schwerdtfeger wrote: > > 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. 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 > > > 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. > On Windows FF updates the system caret when focus changes or when the caret offset changes. We call such Windows functions as: CreateCaret (http://msdn.microsoft.com/en-us/library/ms648399%28VS.85%29.aspx) ShowCaret SetCaretPos I hope that helps. I didn't test this via AT. cheers, David > 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 >
Received on Thursday, 29 April 2010 17:08:12 UTC