Bug 61956 – Remember the scroll position and restore after exiting full-screen mode.

• Component: WebCore Misc.
• Status: RESOLVED FIXED

[Jer Noble]

Remember the scroll position and restore after exiting full-screen mode.

[Jer Noble]

<rdar://problem/9544461>

[Jer Noble]

Created attachment 95797 [details]
Patch

[Jer Noble]

Correction: <rdar://problem/9504664>

[Adam Roben (:aroben)]

What about WebKit1 on Windows?

[Jer Noble]

(In reply to comment #4)
> What about WebKit1 on Windows?

Actually, both WebKit1 & 2 on Windows would need more work.  Let me look into it.

[Jer Noble]

Created attachment 99233 [details]
Patch

[Darin Adler]

Comment on attachment 99233 [details]
Patch

What makes scroll position special? Is there any other state that needs to be saved and restored?

[Eric Seidel (no email)]

Who should review this 6 month old patch?  Should it be r-'d?

[Jer Noble]

(In reply to comment #7)
> (From update of attachment 99233 [details])
> What makes scroll position special? Is there any other state that needs to be saved and restored?

@Darin: Scroll position is modified when entering and exiting full-screen, which is what makes it special.  At this time, I'm not aware of any other state which needs saving in the same way.

[Jer Noble]

Turns out there's at least one more property which needs to be saved and restored: bug #106115.

[Jer Noble]

Created attachment 188356 [details]
Patch

Rebaselined

[Simon Fraser (smfr)]

What if the page scrolls while some element is in fullscreen?

[Jer Noble]

Generally speaking, this won't happen, as we set a 'overflow:hidden' rule on the document root.

[Brad Dougherty]

This would be really helpful for Vimeo when people embed videos on their own pages.

[Simon Fraser (smfr)]

Comment on attachment 188356 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=188356&action=review

> Source/WebKit2/ChangeLog:44
> +        Reviewed by NOBODY (OOPS!).
> +
> +        Remember the scroll position and restore after exiting full-screen mode.
> +        https://bugs.webkit.org/show_bug.cgi?id=61956
> +
> +        Add support for two new FullScreenClient callbacks for saving and restoring the 
> +        full-screen frame's scroll position.
> +
> +        * UIProcess/win/WebView.cpp:
> +        (WebKit::WebView::fullScreenClientSaveScrollPosition):
> +        (WebKit::WebView::fullScreenClientRestoreScrollPosition):
> +        * UIProcess/win/WebView.h:
> +
> [phone]  Jeremy Noble  <[e-mail]>
> +
> +        Reviewed by NOBODY (OOPS!).
> +
> +        Remember the scroll position and restore after exiting full-screen mode.
> +        https://bugs.webkit.org/show_bug.cgi?id=61956
> +        <rdar://problem/9544461>
> +
> +        Call into the main FrameView to save the scroll position before swapping the
> +        WebView into the full-screen window, and restore the scroll position after 
> +        swapping the WebView back into the browser window.
> +
> +        * UIProcess/mac/WKFullScreenWindowController.mm:
> +        (-[WKFullScreenWindowController finishedEnterFullScreenAnimation:]):
> +        (-[WKFullScreenWindowController beganExitFullScreenAnimation]):
> +
> +        In WebKit2, this requires some communication between the WebProcess and the
> +        UIProcess, so add two new messages to WebFullScreenManager to be called by
> +        its proxy.
> +
> +        * UIProcess/WebFullScreenManagerProxy.h:
> +        * UIProcess/WebFullScreenManagerProxy.cpp:
> +        (WebKit::WebFullScreenManagerProxy::saveScrollPosition):
> +        (WebKit::WebFullScreenManagerProxy::restoreScrollPosition):
> +        * WebProcess/FullScreen/WebFullScreenManager.h:
> +        * WebProcess/FullScreen/WebFullScreenManager.messages.in:
> +        * WebProcess/FullScreen/WebFullScreenManager.cpp:
> +        (WebKit::WebFullScreenManager::saveScrollPosition):
> +        (WebKit::WebFullScreenManager::restoreScrollPosition):

Two changelogs!

[Jer Noble]

Committed r152520: <http://trac.webkit.org/changeset/152520>

[Rado]

Hi, this is still happening. Demo: https://codepen.io/matt-west/pen/hmqsF
Is it really resolved? Thanks.