Bug 213086

Summary: DragState::type should be Optional<DragSourceAction> instead of OptionSet<DragSourceAction>
Product: WebKit Reporter: David Kilzer (:ddkilzer) <ddkilzer>
Component: DOMAssignee: Nobody <webkit-unassigned>
Status: NEW ---    
Severity: Normal CC: ahmad.saleem792, darin, thorton, wenson_hsieh
Priority: P2    
Version: Other   
Hardware: Unspecified   
OS: Unspecified   
Bug Depends on: 212885    
Bug Blocks:    

Description David Kilzer (:ddkilzer) 2020-06-11 11:20:50 PDT 
Per Darin's feedback in Bug 212885 Comment #12, DragState::type should be Optional<DragSourceAction> instead of OptionSet<DragSourceAction>.

'''
Refactoring this to be explicitly "OptionSet" when before it was not explicit is making the confusion worse, so I think we need to straighten this out first.

I guess there is some code can set the type to more than one thing. But this seems disorganized and messy. I think it’s not really a general set. It’s just one type plus possibly "selection". Seems really messy. I suppose you aren’t making it worse, but all this "hasExactlyOneBitSet" stuff is just what happens when we make the data structure too confusing. Clearly the "selection" is an independent flag, and need not be included in an option set.
'''
Comment 1 David Kilzer (:ddkilzer) 2020-06-11 11:37:02 PDT 
Note that when DragState::type is changed from OptionSet<> to Optional<>, then WTF::Optional<>::hasExactlyOneBitSet() and WTF::Optional<>::toSingleValue() may also be removed.

The need for both of these methods are also indicative of the need to change DragState::type to Optional<>.