Haptic feedback when changing menu action selection

// FREEBIE

Signal.xcodeproj/project.pbxproj

@@ -414,6 +414,7 @@
 		45FBC5C81DF8575700E9B410 /* CallKitCallManager.swift in Sources */ = {isa = PBXBuildFile; fileRef = 45FBC59A1DF8575700E9B410 /* CallKitCallManager.swift */; };
 		45FBC5D11DF8592E00E9B410 /* SignalCall.swift in Sources */ = {isa = PBXBuildFile; fileRef = 45FBC5D01DF8592E00E9B410 /* SignalCall.swift */; };
 		4AC4EA13C8A444455DAB351F /* Pods_SignalMessaging.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 264242150E87D10A357DB07B /* Pods_SignalMessaging.framework */; };
+		4C090A1B210FD9C7001FD7F9 /* HapticFeedback.swift in Sources */ = {isa = PBXBuildFile; fileRef = 4C090A1A210FD9C7001FD7F9 /* HapticFeedback.swift */; };
 		4C11AA5020FD59C700351FBD /* MessageStatusView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 4C11AA4F20FD59C700351FBD /* MessageStatusView.swift */; };
 		4C13C9F620E57BA30089A98B /* ColorPickerViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 4C13C9F520E57BA30089A98B /* ColorPickerViewController.swift */; };
 		4C20B2B720CA0034001BAC90 /* ThreadViewModel.swift in Sources */ = {isa = PBXBuildFile; fileRef = 4542DF51208B82E9007B4E76 /* ThreadViewModel.swift */; };
@@ -1080,6 +1081,7 @@
 		45FBC59A1DF8575700E9B410 /* CallKitCallManager.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = CallKitCallManager.swift; sourceTree = "<group>"; };
 		45FBC5D01DF8592E00E9B410 /* SignalCall.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = SignalCall.swift; sourceTree = "<group>"; };
 		45FDA43420A4D22700396358 /* OWSNavigationBar.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = OWSNavigationBar.swift; sourceTree = "<group>"; };
+		4C090A1A210FD9C7001FD7F9 /* HapticFeedback.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; name = HapticFeedback.swift; path = UserInterface/HapticFeedback.swift; sourceTree = "<group>"; };
 		4C11AA4F20FD59C700351FBD /* MessageStatusView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MessageStatusView.swift; sourceTree = "<group>"; };
 		4C13C9F520E57BA30089A98B /* ColorPickerViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ColorPickerViewController.swift; sourceTree = "<group>"; };
 		4C20B2B820CA10DE001BAC90 /* ConversationSearchViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ConversationSearchViewController.swift; sourceTree = "<group>"; };
@@ -1855,6 +1857,7 @@
 			isa = PBXGroup;
 			children = (
 				450DF2071E0DD29E003D14BE /* Notifications */,
+				4C090A1A210FD9C7001FD7F9 /* HapticFeedback.swift */,
 				34FD936E1E3BD43A00109093 /* OWSAnyTouchGestureRecognizer.h */,
 				34FD936F1E3BD43A00109093 /* OWSAnyTouchGestureRecognizer.m */,
 				34B3F8331E8DF1700035BE1A /* ViewControllers */,
@@ -3254,6 +3257,7 @@
 				34A55F3720485465002CC6DE /* OWS2FARegistrationViewController.m in Sources */,
 				340FC8AD204DAC8D007AEB0F /* OWSLinkedDevicesTableViewController.m in Sources */,
 				340FC8AA204DAC8D007AEB0F /* NotificationSettingsViewController.m in Sources */,
+				4C090A1B210FD9C7001FD7F9 /* HapticFeedback.swift in Sources */,
 				3496744F2076ACD000080B5F /* LongTextViewController.swift in Sources */,
 				34FD93701E3BD43A00109093 /* OWSAnyTouchGestureRecognizer.m in Sources */,
 				34B3F8931E8DF1710035BE1A /* SignalsNavigationController.m in Sources */,

Signal/src/UserInterface/HapticFeedback.swift

@@ -0,0 +1,51 @@
+//
+//  Copyright (c) 2018 Open Whisper Systems. All rights reserved.
+//
+
+import Foundation
+
+protocol HapticAdapter {
+    func selectionChanged()
+}
+
+class LegacyHapticAdapter: NSObject, HapticAdapter {
+
+    // MARK: HapticAdapter
+
+    func selectionChanged() {
+        // do nothing
+    }
+}
+
+@available(iOS 10, *)
+class FeedbackGeneratorHapticAdapter: NSObject, HapticAdapter {
+    let selectionFeedbackGenerator: UISelectionFeedbackGenerator
+
+    override init() {
+        selectionFeedbackGenerator = UISelectionFeedbackGenerator()
+        selectionFeedbackGenerator.prepare()
+    }
+
+    // MARK: HapticAdapter
+
+    func selectionChanged() {
+        selectionFeedbackGenerator.selectionChanged()
+        selectionFeedbackGenerator.prepare()
+    }
+}
+
+class HapticFeedback: HapticAdapter {
+    let adapter: HapticAdapter
+
+    init() {
+        if #available(iOS 10, *) {
+            adapter = FeedbackGeneratorHapticAdapter()
+        } else {
+            adapter = LegacyHapticAdapter()
+        }
+    }
+
+    func selectionChanged() {
+        adapter.selectionChanged()
+    }
+}

Signal/src/ViewControllers/MenuActionsViewController.swift

@@ -261,6 +261,9 @@ class MenuActionSheetView: UIView, MenuActionViewDelegate {
     private let actionStackView: UIStackView
     private var actions: [MenuAction]
     private var actionViews: [MenuActionView]
+    private var hapticFeedback: HapticFeedback
+    private var hasEverHighlightedAction = false
+
     weak var delegate: MenuActionSheetDelegate?
 
     override var bounds: CGRect {
@@ -281,6 +284,7 @@ class MenuActionSheetView: UIView, MenuActionViewDelegate {
 
         actions = []
         actionViews = []
+        hapticFeedback = HapticFeedback()
 
         super.init(frame: frame)
 
@@ -371,7 +375,13 @@ class MenuActionSheetView: UIView, MenuActionViewDelegate {
             unhighlightAllActionViews()
             return
         }
+
+        if hasEverHighlightedAction, !touchedView.isHighlighted {
+            self.hapticFeedback.selectionChanged()
+        }
         touchedView.isHighlighted = true
+        hasEverHighlightedAction = true
+
         self.actionViews.filter { $0 != touchedView }.forEach {  $0.isHighlighted = false }
     }
 
@@ -441,7 +451,6 @@ class MenuActionView: UIButton {
 
     override var isHighlighted: Bool {
         didSet {
-            Logger.debug("\(logTag) in \(#function) \(oldValue) -> \(isHighlighted)")
             self.backgroundColor = isHighlighted ? UIColor.ows_light10 : UIColor.white
         }
     }