Bug 151840 – [iOS] Suspend and resume device motion and device orientation updates when page is hidden and visible, respectively

• Component: WebKit2
• Status: RESOLVED FIXED

[Daniel Bates]

As we do in Legacy WebKit, in WebKit2 we should suspend active DOM objects when the a page is in the background or the app leaves the foreground.

[Daniel Bates]

<rdar://problem/23753931>

[Daniel Bates]

Created attachment 266817 [details]
Patch and manual test

This patch teach WebKit2 to call to the iOS-specific Frame::setTimersPaused() machinery. Ideally we should unify the iOS-specific Frame::setTimersPaused() machinery with the platform-independent Frame::{suspend, resume}ActiveDOMObjectsAndAnimations()-logic and then make use of the latter logic in WebKit2.

[Daniel Bates]

After talking with Brent Fulgham and Sam Weinig today (12/09) it seems sufficient to suspend device motion and device orientation updates for now. In the future we may want to consider being more aggressive and suspending and resuming DOM timers when a page is hidden and made visible, respectively.

[Daniel Bates]

Created attachment 267060 [details]
Patch and manual test

[Simon Fraser (smfr)]

Comment on attachment 267060 [details]
Patch and manual test

View in context: https://bugs.webkit.org/attachment.cgi?id=267060&action=review

> Source/WebCore/page/Page.cpp:1311
> +    syslog(LOG_WARNING, "## Page::setIsVisibleInternal; isVisible: %d", isVisible);

I don't think you want to commit that.

> Source/WebCore/page/Page.h:398
> +    void suspendDeviceMotionAndOrientationUpdates();
> +    void resumeDeviceMotionAndOrientationUpdates();

I don't see anyone calling these.

[Daniel Bates]

(In reply to comment #5)
> Comment on attachment 267060 [details]
> Patch and manual test
> 
> View in context:
> https://bugs.webkit.org/attachment.cgi?id=267060&action=review
> 
> > Source/WebCore/page/Page.cpp:1311
> > +    syslog(LOG_WARNING, "## Page::setIsVisibleInternal; isVisible: %d", isVisible);
> 
> I don't think you want to commit that.
> 

Will remove before landing.

> > Source/WebCore/page/Page.h:398
> > +    void suspendDeviceMotionAndOrientationUpdates();
> > +    void resumeDeviceMotionAndOrientationUpdates();
> 
> I don't see anyone calling these.

These are called by Page::setIsVisibleInternal().

[Daniel Bates]

Committed r193885: <http://trac.webkit.org/changeset/193885>