Eliminate DragSession structure

• Component: WebCore Misc.
• Status: RESOLVED FIXED

[Alexey Proskuryakov]

It is very difficult to figure out which object is responsible for what in dragging. We have many "session"-like object, including DragController, DragData, DragState and DragSession. Plus a DragOperation enum that could also look like a session object at a first glance.

DragSession is the worst - it's really just a transient response to NSDragDestination delegate methods. WebKit2 keeps it as a member of WebPageProxy, but that's only because of its asynchronous nature - we can't apply the response until the next delegate call is made.

[Alexey Proskuryakov]

Created attachment 229001 [details]
proposed patch

[Benjamin Poulain]

Comment on attachment 229001 [details]
proposed patch

View in context: https://bugs.webkit.org/attachment.cgi?id=229001&action=review

Looks great.

> Source/WebCore/page/DragController.h:65
> +        // As computed from the most recent DragData.

Not sure the comment is useful. That is pretty much true for all the state of DragController.

> Source/WebKit2/UIProcess/WebPageProxy.h:905
> +    void resetCurrentDragInformation() { m_currentDragOperation = WebCore::DragOperationNone; m_currentDragIsOverFileInput = false; m_currentDragNumberOfFilesToBeAccepted = 0; }

Let's put this in the cpp file or split it over 3 lines.

> Source/WebKit2/UIProcess/API/mac/WKView.mm:2251
> +    NSInteger numberOfValidItemsForDrop = _data->_page->currentDragNumberOfFilesToBeAccepted();

No need for cast here?

> Source/WebKit2/WebProcess/WebPage/WebPage.cpp:2783
> +    DragOperation resolvedDragOperation;

It may be better to create a scope for both cases and define resolvedDragOperation in there.

[Alexey Proskuryakov]

Committed <http://trac.webkit.org/r167074>.

[Alexey Proskuryakov]

Tried to fix Gtk build in <http://trac.webkit.org/r167075>.