[webkit-dev] DeviceOrientation/Motion on Document rather than Page

Eric Seidel eric at webkit.org
Mon Aug 16 22:52:43 PDT 2010

Where-ever it goes, please don't put it on Document directly. :)
(Feel free to tie it to Document's lifetime, just don't add to
Document's 300+ methods.)

The madness must stop...  Document is long overdue for some weightloss...


On Mon, Aug 16, 2010 at 11:43 PM, Dean Jackson <dino at apple.com> wrote:
> Hi,
> I've been looking into implementing the clients for DeviceOrientation/Motion Events. Currently, the controllers for these events are members of Page. I think they are better suited on Document.
> Here are a few reasons:
> - Page isn't tied to any actual web page or document. Would we want to share the same controller and client across multiple web pages? I don't think so.
> - Document is already the place that is listening for these events
> - It's easy to suspend and resume the client from the Document-level when the user navigates to another page, or the document enters the cache, or a platform needs to temporarily suspend events for some reason.
> - When the API is on Page, it is hidden in the WebView, from where it is difficult to access.
> - it would allow the client to live in WebCore. This avoids tweaking the WebView implementations for all platforms to pass messages back and forth
> https://bugs.webkit.org/show_bug.cgi?id=41616
> I assume one of the advantages of having them on Page is that it allows a Mock Controller to be easily created for testing from Dump Render Tree. Am I right? Is this that important?
> FWIW, Geolocation seems to take both approaches. One implementation is down in Navigator/Document/DOMWindow, but the mock controller is on Page. I've found the low-level approach much easier to implement.
> Thoughts?
> Dean
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