Shuffle & Cleanup Stuff (#3080)

Source/Layout/ASOverlayLayoutSpec.h

@@ -0,0 +1,35 @@
+//
+//  ASOverlayLayoutSpec.h
+//  AsyncDisplayKit
+//
+//  Copyright (c) 2014-present, Facebook, Inc.  All rights reserved.
+//  This source code is licensed under the BSD-style license found in the
+//  LICENSE file in the root directory of this source tree. An additional grant
+//  of patent rights can be found in the PATENTS file in the same directory.
+//
+
+#import <AsyncDisplayKit/ASLayoutSpec.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+/**
+ This layout spec lays out a single layoutElement child and then overlays a layoutElement object on top of it streched to its size
+ */
+@interface ASOverlayLayoutSpec : ASLayoutSpec
+
+/**
+ * Overlay layoutElement of this layout spec
+ */
+@property (nonatomic, strong) id<ASLayoutElement> overlay;
+
+/**
+ * Creates and returns an ASOverlayLayoutSpec object with a given child and an layoutElement that act as overlay.
+ *
+ * @param child A child that is laid out to determine the size of this spec.
+ * @param overlay A layoutElement object that is laid out over the child.
+ */
++ (instancetype)overlayLayoutSpecWithChild:(id<ASLayoutElement>)child overlay:(id<ASLayoutElement>)overlay AS_WARN_UNUSED_RESULT;
+
+@end
+
+NS_ASSUME_NONNULL_END