[WK2][iOS] Add WKWebView private API to save a back/forward snapshot

• Component: WebKit2
• Status: RESOLVED FIXED

[Chris Dumez]

Add WKWebView private API to save a back/forward snapshot so that the client can make sure a back/forward snapshot is available even when swapping WKWebView upon navigation.

[Chris Dumez]

rdar://problem/21584231

Is this something the existing session state API can do?

[Chris Dumez]

(In reply to comment #2)
> Is this something the existing session state API can do?

I will check. I was trying to match the way we currently do this on Mac:

in WKViewPrivate.h
- (void)saveBackForwardSnapshotForItem:(WKBackForwardListItemRef)item;

[Chris Dumez]

(In reply to comment #2)
> Is this something the existing session state API can do?

Please see comment on radar.

[Chris Dumez]

Created attachment 255729 [details]
Patch

Comment on attachment 255729 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=255729&action=review

> Source/WebKit2/UIProcess/API/Cocoa/WKWebViewPrivate.h:212
> +- (void)_saveBackForwardSnapshotForItem:(WKBackForwardListItem *)item WK_AVAILABLE(WK_MAC_TBA, WK_IOS_TBA);

Can this be used on an item that isn’t the current item? What does it do in that case?

[Chris Dumez]

Comment on attachment 255729 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=255729&action=review

>> Source/WebKit2/UIProcess/API/Cocoa/WKWebViewPrivate.h:212
>> +- (void)_saveBackForwardSnapshotForItem:(WKBackForwardListItem *)item WK_AVAILABLE(WK_MAC_TBA, WK_IOS_TBA);
> 
> Can this be used on an item that isn’t the current item? What does it do in that case?

Yes, it can and it is the intended use. On Mac, we have both saveBackForwardSnapshotForItem(item) and saveBackForwardSnapshotForCurrentItem().

What it does in this case is take a snapshot of the current view and save it on the WKBackForwardListItem that is given. The WKBackForwardListItem being given in this case would be from another WKWebView.

[WebKit Commit Bot]

Comment on attachment 255729 [details]
Patch

Clearing flags on attachment: 255729

Committed r186077: <http://trac.webkit.org/changeset/186077>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.