Merge commit '7621e2f8dec938cf48181c8b10afc9b01f444e68' into beta

submodules/Display/Source/HighlightTrackingButton.swift

@@ -0,0 +1,56 @@
+import UIKit
+
+open class HighlightTrackingButton: UIButton {
+    private var internalHighlighted = false
+    
+    public var internalHighligthedChanged: (Bool) -> Void = { _ in }
+    public var highligthedChanged: (Bool) -> Void = { _ in }
+    
+    override public init(frame: CGRect) {
+        super.init(frame: frame)
+    }
+    
+    required public init?(coder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+    
+    open override func beginTracking(_ touch: UITouch, with event: UIEvent?) -> Bool {
+        if !self.internalHighlighted {
+            self.internalHighlighted = true
+            self.highligthedChanged(true)
+            self.internalHighligthedChanged(true)
+        }
+        
+        return super.beginTracking(touch, with: event)
+    }
+    
+    open override func endTracking(_ touch: UITouch?, with event: UIEvent?) {
+        if self.internalHighlighted {
+            self.internalHighlighted = false
+            self.highligthedChanged(false)
+            self.internalHighligthedChanged(false)
+        }
+        
+        super.endTracking(touch, with: event)
+    }
+    
+    open override func cancelTracking(with event: UIEvent?) {
+        if self.internalHighlighted {
+            self.internalHighlighted = false
+            self.highligthedChanged(false)
+            self.internalHighligthedChanged(false)
+        }
+        
+        super.cancelTracking(with: event)
+    }
+    
+    open override func touchesCancelled(_ touches: Set<UITouch>, with event: UIEvent?) {
+        if self.internalHighlighted {
+            self.internalHighlighted = false
+            self.highligthedChanged(false)
+            self.internalHighligthedChanged(false)
+        }
+        
+        super.touchesCancelled(touches, with: event)
+    }
+}