[webkit-changes] [WebKit/WebKit] 196398: [iOS] [WK2] Adopt _UIAsyncDragInteraction and _UIA...

[Wenson Hsieh]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: 196398d09011b84ec6081ec5fb5ff932c0de2622
      https://github.com/WebKit/WebKit/commit/196398d09011b84ec6081ec5fb5ff932c0de2622
  Author: Wenson Hsieh <wenson_hsieh at apple.com>
  Date:   2023-09-26 (Tue, 26 Sep 2023)

  Changed paths:
    M Source/WTF/Scripts/Preferences/UnifiedWebPreferences.yaml
    M Source/WebKit/Platform/spi/ios/UIKitSPI.h
    M Source/WebKit/UIProcess/ios/WKContentViewInteraction.h
    M Source/WebKit/UIProcess/ios/WKContentViewInteraction.mm

  Log Message:
  -----------
  [iOS] [WK2] Adopt _UIAsyncDragInteraction and _UIAsyncDragInteractionDelegate
https://bugs.webkit.org/show_bug.cgi?id=262006
rdar://114331777

Reviewed by Tim Horton.

As a part of cleaning up asynchronous `UIInteraction` integration in WebKit, adopt a new
`_UIAsyncDragInteraction` subclass that encapsulates the delegate methods for both (1) starting a
drag session asynchronously, and (2) adding items to an existing drag session asynchronously.

* Source/WTF/Scripts/Preferences/UnifiedWebPreferences.yaml:

Add a runtime feature flag as well, to guard adoption of these new async `UIInteraction`s in UIKit.

* Source/WebKit/Platform/spi/ios/UIKitSPI.h:
* Source/WebKit/UIProcess/ios/WKContentViewInteraction.h:
* Source/WebKit/UIProcess/ios/WKContentViewInteraction.mm:
(-[WKContentView _dragInteractionClass]):

Add a helper method to return the drag interaction class to instantiate, based on runtime and build-
time flags.

(-[WKContentView setUpDragAndDropInteractions]):
(-[WKContentView asyncDragInteraction:prepareDragSession:completion:]):
(-[WKContentView asyncDragInteraction:itemsForAddingToSession:withTouchAtPoint:completion:]):

Implement the new `_UIAsyncDragInteractionDelegate` methods here.

Canonical link: https://commits.webkit.org/268470@main