- From: Rik Cabanier <cabanier@gmail.com>
- Date: Mon, 28 Apr 2014 10:48:29 -0700
- To: Jay Munro <jaymunro@microsoft.com>
- Cc: Mark Sadecki <mark@w3.org>, "public-canvas-api@w3.org" <public-canvas-api@w3.org>
- Message-ID: <CAGN7qDAfW6j-0EDB2qLL6xfbk_jiDxQxBD2WYke_8CqNwaLnEQ@mail.gmail.com>
On Mon, Apr 28, 2014 at 10:28 AM, Jay Munro <jaymunro@microsoft.com> wrote: > Rik, > > > > I see it responds to a mousemove event, which was something we wanted but > thought might be difficult. Looks like it covers it nicely. > Thanks! Yes, any event that derives of the mouse event should now support the region attribute. The hard part was the retargeting which we're postponing to level 2 > > > *From:* Rik Cabanier [mailto:cabanier@gmail.com] > *Sent:* Monday, April 28, 2014 8:42 AM > *To:* Mark Sadecki > *Cc:* public-canvas-api@w3.org > *Subject:* Re: Final changes to Hit Regions before return to Last Call > > > > Hi Mark, > > > > I implemented a prototype implementation of hit regions in Firefox. It has > not landed in FF Nightly yet, but that should happen shortly. > > Here's a build for windows: > http://ftp.mozilla.org/pub/mozilla.org/firefox/try-builds/cabanier@adobe.com-7c242c5e96ce/try-win32/firefox-31.0a1.en-US.win32.zip > > and for mac: > http://ftp.mozilla.org/pub/mozilla.org/firefox/try-builds/cabanier@adobe.com-7c242c5e96ce/try-macosx64/firefox-31.0a1.en-US.mac.dmg > > > > After downloading, set the hitregions flag to true (about:config -> > canvas.hitregions.enabled) and restart. > > Here's an example: http://codepen.io/anon/pen/zEsxa?editors=101 > > Hovering over the areas, should update the text with the ID of the area. > The regions should also be accessible to a11y tools. > > > > Please let me know if this is behaving as expected, especially the a11y > part. > > > > Rik > > > > On Tue, Apr 15, 2014 at 12:53 PM, Mark Sadecki <mark@w3.org> wrote: > > The following changes were discussed during the canvas accessibility sub > group > call on 14 APR 2014 > > <http://www.w3.org/2014/04/14-html-a11y-minutes.html> > > ## The region representing the control > > * Add a step that handles a null value for control, similar to the one > that is > defined for ID, just before the existing step 1. > > > "If control is null, return nothing and abort these steps." > > ## The region for a pixel > > * Change "set of pixels" to "path" in step 2 and link "path" to > < > http://www.w3.org/html/wg/drafts/2dcontext/html5_canvas_CR/#hit-region%27s-path > > > > ## addHitRegion() > > * add the following step after step 3 (Let specified pixels be the pixels > contained in source path.) > > > "Remove from specified pixels any pixels not contained within the > clipping > region." > > ## clearHitRegions() > > * Remove Step 2 RE: Garbage Collection > > ## MouseEvent > > We agreed that we would eliminate event retargeting altogether and just > pass the > event.region to the canvas element. This would require the following > changes: > > * Revert order of steps and add step for handling a canvas element with no > hit > region list. The first 4 steps should read as follows: > > 1. If the pointing device is not indicating a pixel on the canvas, act > as > normal and abort these steps. > -> 2. If the canvas element has no hit region list, act as normal and abort > these steps. > 3. Let pixel be the pixel indicated by the pointing device. > 4. Let region be the hit region that is the region for the pixel pixel > on > this canvas element's bitmap, if any. > > * The following steps are no longer required (the numbers will be shifted > by one > if the above steps have been followed) and should be removed: > > 7. Let control be the region's control, if any. > 8. Let the canvas element be the target of the event object, unless there > is a > control, then target the control instead. > 9. Continue dispatching the event, but with the updated event object and > target > as given in the above steps. > > -- > Mark Sadecki > Web Accessibility Engineer > World Wide Web Consortium, Web Accessibility Initiative > Telephone: +1.617.715.4017 > Email: mark@w3.org > Web: http://w3.org/People/mark > > >
Received on Monday, 28 April 2014 17:49:00 UTC