Merge commit '7621e2f8dec938cf48181c8b10afc9b01f444e68' into beta

submodules/Display/Source/AccessibilityAreaNode.swift

@@ -0,0 +1,56 @@
+import Foundation
+import UIKit
+import AsyncDisplayKit
+
+public protocol AccessibilityFocusableNode {
+    func accessibilityElementDidBecomeFocused()
+}
+
+public final class AccessibilityAreaNode: ASDisplayNode {
+    public var activate: (() -> Bool)?
+    public var increment: (() -> Void)?
+    public var decrement: (() -> Void)?
+    public var focused: (() -> Void)?
+    
+    override public init() {
+        super.init()
+        
+        self.isAccessibilityElement = true
+    }
+    
+    override public func accessibilityActivate() -> Bool {
+        return self.activate?() ?? false
+    }
+    
+    override public func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {
+        return nil
+    }
+    
+    override public func accessibilityElementDidBecomeFocused() {
+        if let focused = self.focused {
+            focused()
+        } else {
+            var supernode = self.supernode
+            while true {
+                if let supernodeValue = supernode {
+                    if let listItemNode = supernodeValue as? AccessibilityFocusableNode {
+                        listItemNode.accessibilityElementDidBecomeFocused()
+                        break
+                    } else {
+                        supernode = supernodeValue.supernode
+                    }
+                } else {
+                    break
+                }
+            }
+        }
+    }
+
+    override public func accessibilityIncrement() {
+        self.increment?()
+    }
+    
+    override public func accessibilityDecrement() {
+        self.decrement?()
+    }
+}