/* 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 <Foundation/Foundation.h>
#import <UIKit/NSLayoutManager.h>

NS_ASSUME_NONNULL_BEGIN

/**
  @abstract This class acts as the NSLayoutManagerDelegate for ASTextNode.
  @discussion Its current job is word kerning, i.e. adjusting the width of spaces to match the set
    wordKernedSpaceWidth. If word kerning is not needed, set the layoutManager's delegate to nil.
 */
@interface ASTextNodeWordKerner : NSObject <NSLayoutManagerDelegate>

/**
  The following @optional NSLayoutManagerDelegate methods are implemented:

- (NSUInteger)layoutManager:(NSLayoutManager *)layoutManager shouldGenerateGlyphs:(const CGGlyph *)glyphs properties:(const NSGlyphProperty *)props characterIndexes:(const NSUInteger *)charIndexes font:(UIFont *)aFont forGlyphRange:(NSRange)glyphRange NS_AVAILABLE_IOS(7_0);

- (NSControlCharacterAction)layoutManager:(NSLayoutManager *)layoutManager shouldUseAction:(NSControlCharacterAction)action forControlCharacterAtIndex:(NSUInteger)charIndex NS_AVAILABLE_IOS(7_0);

- (CGRect)layoutManager:(NSLayoutManager *)layoutManager boundingBoxForControlGlyphAtIndex:(NSUInteger)glyphIndex forTextContainer:(NSTextContainer *)textContainer proposedLineFragment:(CGRect)proposedRect glyphPosition:(CGPoint)glyphPosition characterIndex:(NSUInteger)charIndex NS_AVAILABLE_IOS(7_0);
 */

@end

NS_ASSUME_NONNULL_END