101 lines
2.6 KiB
Objective-C
101 lines
2.6 KiB
Objective-C
// Copyright 2004-present Facebook. All Rights Reserved.
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#import "RCTText.h"
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#import "RCTShadowText.h"
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#import "RCTUtils.h"
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#import "UIView+ReactKit.h"
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@implementation RCTText
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{
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NSLayoutManager *_layoutManager;
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NSTextStorage *_textStorage;
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NSTextContainer *_textContainer;
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}
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- (instancetype)initWithFrame:(CGRect)frame
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{
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if ((self = [super initWithFrame:frame])) {
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_textContainer = [[NSTextContainer alloc] init];
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_textContainer.lineBreakMode = NSLineBreakByTruncatingTail;
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_textContainer.lineFragmentPadding = 0.0;
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_layoutManager = [[NSLayoutManager alloc] init];
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[_layoutManager addTextContainer:_textContainer];
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_textStorage = [[NSTextStorage alloc] init];
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[_textStorage addLayoutManager:_layoutManager];
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self.contentMode = UIViewContentModeRedraw;
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}
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return self;
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}
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- (NSAttributedString *)attributedText
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{
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return [_textStorage copy];
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}
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- (void)setAttributedText:(NSAttributedString *)attributedText
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{
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[_textStorage setAttributedString:attributedText];
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[self setNeedsDisplay];
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}
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- (NSUInteger)numberOfLines
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{
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return _textContainer.maximumNumberOfLines;
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}
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- (void)setNumberOfLines:(NSUInteger)numberOfLines
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{
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_textContainer.maximumNumberOfLines = numberOfLines;
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[self setNeedsDisplay];
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}
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- (NSLineBreakMode)lineBreakMode
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{
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return _textContainer.lineBreakMode;
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}
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- (void)setLineBreakMode:(NSLineBreakMode)lineBreakMode
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{
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_textContainer.lineBreakMode = lineBreakMode;
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[self setNeedsDisplay];
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}
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- (void)layoutSubviews
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{
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[super layoutSubviews];
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// The header comment for `size` says that a height of 0.0 should be enough,
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// but it isn't.
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_textContainer.size = CGSizeMake(self.bounds.size.width, CGFLOAT_MAX);
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}
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- (void)drawRect:(CGRect)rect
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{
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NSRange glyphRange = [_layoutManager glyphRangeForTextContainer:_textContainer];
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[_layoutManager drawBackgroundForGlyphRange:glyphRange atPoint:CGPointZero];
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[_layoutManager drawGlyphsForGlyphRange:glyphRange atPoint:CGPointZero];
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}
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- (NSNumber *)reactTagAtPoint:(CGPoint)point
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{
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CGFloat fraction;
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NSUInteger characterIndex = [_layoutManager characterIndexForPoint:point inTextContainer:_textContainer fractionOfDistanceBetweenInsertionPoints:&fraction];
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NSNumber *reactTag = nil;
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// If the point is not before (fraction == 0.0) the first character and not
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// after (fraction == 1.0) the last character, then the attribute is valid.
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if (_textStorage.length > 0 && (fraction > 0 || characterIndex > 0) && (fraction < 1 || characterIndex < _textStorage.length - 1)) {
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reactTag = [_textStorage attribute:RCTReactTagAttributeName atIndex:characterIndex effectiveRange:NULL];
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}
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return reactTag ?: self.reactTag;
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}
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@end
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