Initial commit.

AsyncDisplayKit/Details/ASTextNodeTextKitHelpers.h

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+/* 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 <objc/message.h>
+
+#import <Foundation/Foundation.h>
+#import <UIKit/UIKit.h>
+
+typedef struct {
+  NSTextStorage *textStorage;
+  NSTextContainer *textContainer;
+  NSLayoutManager *layoutManager;
+  UITextView *textView;
+} ASTextKitComponents;
+
+// Convenience.
+/**
+  @abstract Creates the stack of TextKit components.
+  @param attributedSeedString The attributed string to sed the returned text storage with, or nil to receive an blank text storage.
+  @param textContainerSize The size of the text-container. Typically, size specifies the constraining width of the layout, and FLT_MAX for height. Pass CGSizeZero if these components will be hooked up to a UITextView, which will manage the text container's size itself.
+  @return A {@ref ASTextKitComponents} containing the created components. The text view component will be nil.
+  @discussion The returned components will be hooked up together, so they are ready for use as a system upon return.
+ */
+extern ASTextKitComponents ASTextKitComponentsCreate(NSAttributedString *attributedSeedString, CGSize textContainerSize);
+/**
+  @abstract Returns the bounding size for the text view's text.
+  @param components The TextKit components to calculate the constrained size of the text for.
+  @param constrainedWidth The constraining width to be used during text-sizing. Usually, this value should be the receiver's calculated size.
+  @result A CGSize representing the bounding size for the receiver's text.
+ */
+extern CGSize ASTextKitComponentsSizeForConstrainedWidth(ASTextKitComponents components, CGFloat constrainedWidth);