[whatwg] Removing hit regions without calling clearRect() or addHitRegion()

Charles Pritchard chuck at jumis.com
Thu Jul 5 11:34:45 PDT 2012

There's also just removing the element from the DOM. Yes, I'd like a removeHitRegion(Element) feature; though I can skate by with the empty addHitRegion method.

I've not seen a response from you regarding the issues that Richard and Steve have brought up around the lightweight nodes feature-proposal. It seems relevant to the method signature of removeHitRegion.

On Jul 5, 2012, at 9:40 AM, Edward O'Connor <eoconnor at apple.com> wrote:

> Hi,
> Currently, there are only two ways to invoke the "clear regions that
> cover the pixels" algorithm: by calling either addHitRegion() or
> clearRect(). Authors should be able to explicitly remove a hit region as
> well, with a removeHitRegion(id) method.
> Consider a region of a canvas which the author would like to toggle
> between clickable and non-clickable states without drawing. Maybe
> they're indicating clickability by drawing a different outline around
> the region without actually redrawing the region itself, or perhaps
> there is no visible indication that the region's clickability is
> changing. Such an author should be able to straightforwardly achieve
> this without redrawing the region (as clearRect would require) and
> without installing a dummy hit region (as addHitRegion would require).
> Thanks,
> Ted

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