- From: Richard Schwerdtfeger <schwer@us.ibm.com>
- Date: Fri, 8 Jul 2011 12:19:38 -0500
- To: Charles Pritchard <chuck@jumis.com>
- Cc: paniz alipour <alipourpaniz@gmail.com>, "cyns@exchange.microsoft.com" <cyns@exchange.microsoft.com>, "david.bolter@gmail.com" <david.bolter@gmail.com>, "franko@microsoft.com" <franko@microsoft.com>, "Mike@w3.org" <Mike@w3.org>, "public-canvas-api@w3.org" <public-canvas-api@w3.org>, "public-canvas-api-request@w3.org" <public-canvas-api-request@w3.org>, "public-html@w3.org" <public-html@w3.org>, "public-html-a11y@w3.org" <public-html-a11y@w3.org>
- Message-ID: <OF5C10ABB2.90B52EA0-ON862578C7.005F1703-862578C7.005F2E25@us.ibm.com>
IE9's ARIA support is improved over IE8.
Rich Schwerdtfeger
CTO Accessibility Software Group
From: Charles Pritchard <chuck@jumis.com>
To: paniz alipour <alipourpaniz@gmail.com>
Cc: Richard Schwerdtfeger/Austin/IBM@IBMUS,
"cyns@exchange.microsoft.com" <cyns@exchange.microsoft.com>,
"david.bolter@gmail.com" <david.bolter@gmail.com>,
"franko@microsoft.com" <franko@microsoft.com>, "Mike@w3.org"
<Mike@w3.org>, "public-canvas-api@w3.org"
<public-canvas-api@w3.org>, "public-canvas-api-request@w3.org"
<public-canvas-api-request@w3.org>, "public-html@w3.org"
<public-html@w3.org>, "public-html-a11y@w3.org"
<public-html-a11y@w3.org>
Date: 07/08/2011 12:17 PM
Subject: Re: hit testing and retained graphics
Sent by: public-canvas-api-request@w3.org
You are correct: IE9 introduced support for Canvas and the sub-tree (with
drawFocusRing).
IE8 introduced support for WAI-ARIA.
You may view a page as it would render in IE7 and IE8 by using IE9s F12
Developer Tools
and changing the compatibility view mode.
On 7/7/2011 11:41 PM, paniz alipour wrote:
I knew Charles,but I remember that shadow Dom and fallback content
sub-tree is just supported in IE9.Am I right?
On Fri, Jul 8, 2011 at 10:51 AM, Charles Pritchard <chuck@jumis.com>
wrote:
IE8 does not support canvas; it shows the fallback content.
On Jul 7, 2011, at 11:18 PM, paniz alipour <alipourpaniz@gmail.com>
wrote:
Hi Richard,
There was some thing marvelous! As I found out shadow Dom or
fallback content was just supported in IE9 ,but I saw that it
is run in IE8 too.
I mean your sample that you had sent it for me.
Am I right ? What has happened?
Thanks
On Thu, Jul 7, 2011 at 6:45 PM, Richard Schwerdtfeger <
schwer@us.ibm.com> wrote:
Yes, the author draws the widget on the canvas based on the
information in the canvas subtree.
If you don't use the subtree it won't be in the keyboard
navigation order and you can't provide the accessibility
information
From the HTML 5 spec on canvas:
http://dev.w3.org/html5/spec/the-canvas-element.html#the-canvas-element
"When a canvas element represents embedded content, the user
can still focus descendants of the canvas element (in the
fallback content). When an element is focused, it is the
target of keyboard interaction events (even though the
element itself is not visible). This allows authors to make
an interactive canvas keyboard-accessible: authors should
have a one-to-one mapping of interactive regions to
focusable elements in the fallback content. (Focus has no
effect on mouse interaction events.) [DOMEVENTS]"
Attached is a basic example:
(See attached file: CanvasEditor.html)
Rich Schwerdtfeger
CTO Accessibility Software Group
<graycol.gif>paniz alipour ---07/07/2011 09:04:12 AM---Hi
Richard, Yes I get your purpose,except one part :
From: paniz alipour <alipourpaniz@gmail.com>
To: Richard Schwerdtfeger/Austin/IBM@IBMUS
Cc: chuck@jumis.com, cyns@exchange.microsoft.com,
david.bolter@gmail.com, franko@microsoft.com, Mike@w3.org,
public-canvas-api@w3.org, public-canvas-api-request@w3.org,
public-html@w3.org, public-html-a11y@w3.org
Date: 07/07/2011 09:04 AM
Subject: Re: hit testing and retained graphics
Sent by: public-canvas-api-request@w3.org
Hi Richard,
Yes I get your purpose,except one part :
You control the drawing ?!
in this sentence:
If you wanted to create a canvas rendering of a checkbox in
the fallback content, on the canvas that was 70X70 you can
do it. You control the drawing
and some thing else if a developer doesn't use sub-tree in
shadow DOM? what does happen?
Thanks
On Thu, Jul 7, 2011 at 6:25 PM, Richard Schwerdtfeger <
schwer@us.ibm.com> wrote:
Hi Paniz,
I am not sure if I am answering your question but you
could create these objects on canvas and create
equivalents in the canvas subtree whereby the canvas
is a rendering of the HTML element in the canvas
subtree and you can give it any size and dimension you
want. All the elements in canvas subtree could be
placed in the keyboard navigation order. If you wanted
to create a canvas rendering of a checkbox in the
fallback content, on the canvas that was 70X70 you can
do it. You control the drawing. Accessibility wise I
don't yet have a way to communicate those bounds to
the accessibility API. This is what we have been
discussing. We have been discussing creating a drawing
path on canvas that represents the bounds of the
object, binding it to the canvas subtree element
(which is in the keyboard navigation order). In doing
so we would have the user agent to do hit testing on
the drawing objects in canvas and pass the pointing
event to the corresponding object in the accessibility
subtree. The bounds of the object used for hit testing
would be passed to the corresponding accessible object
(corresponding the to the DOM element in the subtree).
Now a magnifier would know how to zoom to the
corresponding 70x70 checkbox on the canvas.
To be honest, this is not new. This is how desktops
like Windows work. You have a graphic on the screen
bound to a COM object which supports MSAA. The MSAA
bounding rectangle is retrieved from the retained mode
graphic.
We are arguing for putting this capability into
canvas.
Rich
Rich Schwerdtfeger
CTO Accessibility Software Group
<graycol.gif>paniz alipour ---07/07/2011 08:42:16
AM---Hi Richard, I mean for example I have an
interaction UI on canvas as like web pages,
From: paniz alipour <alipourpaniz@gmail.com>
To: Richard Schwerdtfeger/Austin/IBM@IBMUS
Cc: chuck@jumis.com, cyns@exchange.microsoft.com,
david.bolter@gmail.com, franko@microsoft.com,
Mike@w3.org, public-canvas-api@w3.org,
public-html@w3.org, public-html-a11y@w3.org
Date: 07/07/2011 08:42 AM
Subject: Re: hit testing and retained graphics
Sent by: public-canvas-api-request@w3.org
Hi Richard,
I mean for example I have an interaction UI on canvas
as like web pages,
textbox,radiobutton ,checkbox,.... .I want to know
these elements that are drawn or are images on canvas
could be incredible,Of course they can but in your
opinion how many percent it is possible(forexample
checkbox with height 70 and width 70)
Best Regards
On Thu, Jul 7, 2011 at 6:02 PM, Richard Schwerdtfeger
<schwer@us.ibm.com> wrote:
Hi Paniz,
I am not quite following you. Could you please
provide more detail?
Thanks,
Rich
Rich Schwerdtfeger
CTO Accessibility Software Group
<graycol.gif>paniz alipour ---07/07/2011
06:32:18 AM---Hello to all, Maybe you think that
this question is not related to this discussion,
From: paniz alipour <alipourpaniz@gmail.com>
To: Richard Schwerdtfeger/Austin/IBM@IBMUS
Cc: chuck@jumis.com, franko@microsoft.com,
Mike@w3.org, david.bolter@gmail.com,
cyns@exchange.microsoft.com,
public-canvas-api@w3.org,
public-html-a11y@w3.org, public-html@w3.org
Date: 07/07/2011 06:32 AM
Subject: Re: hit testing and retained graphics
Hello to all,
Maybe you think that this question is not
related to this discussion,
But I want to know whether the web widget that
are located on canvas,
are they incredible .I mean a check box with
height 70,weight 70,
or no it will design as the common web widget on
websites?
Thanks
On Fri, Jun 17, 2011 at 11:11 PM, Richard
Schwerdtfeger <schwer@us.ibm.com> wrote:
Charles, Frank, Mike,
I am back from vacation. How far do we
need to go with hit testing? Right now I
am looking at associating a closed draw
path with a DOM object in the canvas
subtree. We would then need to address the
routing of pointing device input events to
the DOM object. The drawing path can be
used to provide bound information to
platform accessibility API.
Do we need to bind any other drawing
properties to the canvas object - similar
to the way device context's are handled on
graphic subsystems like Windows?
Mike, I am including you as before I went
on vacation you indicated that a number of
developers desired this feature and wanted
to be involved.
Rich
Rich Schwerdtfeger
CTO Accessibility Software Group
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Paniz Alipour
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Paniz Alipour
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Paniz Alipour
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Paniz Alipour
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Paniz Alipour
Attachments
- image/gif attachment: graycol.gif
Received on Friday, 8 July 2011 17:20:15 UTC