/* 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);