Moving SKHighlightOverlay

Summary: Moving FlipperKitLayoutPlugin/FlipperKitPluginUtils/SKHighlightOverlay to shared folder, so Layout and WorkingRange plugins can depend on it

Reviewed By: kevin0571

Differential Revision: D17156396

fbshipit-source-id: 3f17371f2ab4818924d61e6cfb243f60ad1f2892

iOS/Plugins/FlipperKitPluginUtils/FlipperKitHighlightOverlay/SKHighlightOverlay.h

@@ -0,0 +1,17 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the LICENSE
+ * file in the root directory of this source tree.
+ */
+#import <UIKit/UIKit.h>
+
+@interface SKHighlightOverlay : NSObject
+
++ (instancetype)sharedInstance;
++ (UIColor*)overlayColor;
+
+- (void)mountInView:(UIView *)view withFrame:(CGRect)frame;
+- (void)unmount;
+
+@end

iOS/Plugins/FlipperKitPluginUtils/FlipperKitHighlightOverlay/SKHighlightOverlay.mm

@@ -0,0 +1,54 @@
+/*
+ *  Copyright (c) 2018-present, Facebook, Inc. and its affiliates.
+ *
+ *  This source code is licensed under the MIT license found in the LICENSE
+ *  file in the root directory of this source tree.
+ *
+ */
+#if FB_SONARKIT_ENABLED
+
+#import "SKHighlightOverlay.h"
+
+@implementation SKHighlightOverlay
+{
+  CALayer *_overlayLayer;
+}
+
++ (instancetype)sharedInstance {
+  static SKHighlightOverlay *sharedInstance = nil;
+  static dispatch_once_t onceToken;
+  dispatch_once(&onceToken, ^{
+      sharedInstance = [self new];
+  });
+  return sharedInstance;
+}
+
+- (instancetype)init {
+  if (self = [super init]) {
+    _overlayLayer = [CALayer layer];
+    _overlayLayer.backgroundColor = [SKHighlightOverlay overlayColor].CGColor;
+  }
+
+  return self;
+}
+
+- (void)mountInView:(UIView *)view withFrame:(CGRect)frame {
+  [CATransaction begin];
+  [CATransaction setValue:(id)kCFBooleanTrue
+                   forKey:kCATransactionDisableActions];
+  _overlayLayer.frame = frame;
+  [view.layer addSublayer: _overlayLayer];
+  [CATransaction commit];
+}
+
+- (void)unmount {
+  [_overlayLayer removeFromSuperlayer];
+}
+
++ (UIColor*)overlayColor {
+  return [UIColor colorWithRed:136.0 / 255.0 green:117.0 / 255.0 blue:197.0 / 255.0 alpha:0.6];
+}
+
+@end
+
+#endif