141 lines
4.5 KiB
Objective-C
141 lines
4.5 KiB
Objective-C
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*/
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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+React.h"
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@implementation RCTText
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{
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NSTextStorage *_textStorage;
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NSMutableArray *_reactSubviews;
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CAShapeLayer *_highlightLayer;
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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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_textStorage = [[NSTextStorage alloc] init];
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_reactSubviews = [NSMutableArray array];
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self.isAccessibilityElement = YES;
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self.accessibilityTraits |= UIAccessibilityTraitStaticText;
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self.opaque = NO;
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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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- (NSString *)description
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{
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NSString *superDescription = super.description;
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NSRange semicolonRange = [superDescription rangeOfString:@";"];
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NSString *replacement = [NSString stringWithFormat:@"; reactTag: %@; text: %@", self.reactTag, self.textStorage.string];
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return [superDescription stringByReplacingCharactersInRange:semicolonRange withString:replacement];
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}
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- (void)reactSetFrame:(CGRect)frame
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{
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// Text looks super weird if its frame is animated.
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// This disables the frame animation, without affecting opacity, etc.
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[UIView performWithoutAnimation:^{
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[super reactSetFrame:frame];
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}];
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}
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- (void)insertReactSubview:(UIView *)subview atIndex:(NSInteger)atIndex
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{
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[_reactSubviews insertObject:subview atIndex:atIndex];
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}
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- (void)removeReactSubview:(UIView *)subview
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{
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[_reactSubviews removeObject:subview];
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}
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- (NSMutableArray *)reactSubviews
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{
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return _reactSubviews;
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}
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- (void)setTextStorage:(NSTextStorage *)textStorage
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{
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_textStorage = textStorage;
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[self setNeedsDisplay];
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}
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- (void)drawRect:(CGRect)rect
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{
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NSLayoutManager *layoutManager = [_textStorage.layoutManagers firstObject];
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NSTextContainer *textContainer = [layoutManager.textContainers firstObject];
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CGRect textFrame = UIEdgeInsetsInsetRect(self.bounds, _contentInset);
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NSRange glyphRange = [layoutManager glyphRangeForTextContainer:textContainer];
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[layoutManager drawBackgroundForGlyphRange:glyphRange atPoint:textFrame.origin];
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[layoutManager drawGlyphsForGlyphRange:glyphRange atPoint:textFrame.origin];
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__block UIBezierPath *highlightPath = nil;
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[layoutManager.textStorage enumerateAttributesInRange:glyphRange options:0 usingBlock:^(NSDictionary *attrs, NSRange range, __unused BOOL *stop){
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if ([attrs[RCTIsHighlightedAttributeName] boolValue]) {
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[layoutManager enumerateEnclosingRectsForGlyphRange:range withinSelectedGlyphRange:range inTextContainer:textContainer usingBlock:^(CGRect r, __unused BOOL *s){
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UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:CGRectInset(r, -2, -2) cornerRadius:2];
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if (highlightPath) {
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[highlightPath appendPath:path];
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} else {
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highlightPath = path;
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}
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}];
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}
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}];
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if (highlightPath) {
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if (!_highlightLayer) {
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_highlightLayer = [CAShapeLayer layer];
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_highlightLayer.fillColor = [UIColor colorWithWhite:0 alpha:0.25].CGColor;
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[self.layer addSublayer:_highlightLayer];
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}
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_highlightLayer.position = (CGPoint){_contentInset.left, _contentInset.top};
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_highlightLayer.path = highlightPath.CGPath;
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} else {
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[_highlightLayer removeFromSuperlayer];
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_highlightLayer = nil;
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}
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}
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- (NSNumber *)reactTagAtPoint:(CGPoint)point
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{
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NSNumber *reactTag = self.reactTag;
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CGFloat fraction;
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NSLayoutManager *layoutManager = [_textStorage.layoutManagers firstObject];
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NSTextContainer *textContainer = [layoutManager.textContainers firstObject];
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NSUInteger characterIndex = [layoutManager characterIndexForPoint:point
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inTextContainer:textContainer
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fractionOfDistanceBetweenInsertionPoints:&fraction];
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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;
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}
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#pragma mark - Accessibility
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- (NSString *)accessibilityLabel
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{
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return _textStorage.string;
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}
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@end
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