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react-native/Libraries/Text/RCTShadowText.m

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/**
* Copyright (c) 2015-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 "RCTShadowText.h"
#import "RCTAccessibilityManager.h"
#import "RCTUIManager.h"
#import "RCTBridge.h"
#import "RCTConvert.h"
#import "RCTImageComponent.h"
#import "RCTLog.h"
#import "RCTShadowRawText.h"
#import "RCTText.h"
#import "RCTUtils.h"
NSString *const RCTIsHighlightedAttributeName = @"IsHighlightedAttributeName";
NSString *const RCTReactTagAttributeName = @"ReactTagAttributeName";
@implementation RCTShadowText
{
NSTextStorage *_cachedTextStorage;
CGFloat _cachedTextStorageWidth;
CGFloat _cachedTextStorageWidthMode;
NSAttributedString *_cachedAttributedString;
CGFloat _effectiveLetterSpacing;
}
static css_dim_t RCTMeasure(void *context, float width, css_measure_mode_t widthMode, float height, css_measure_mode_t heightMode)
{
RCTShadowText *shadowText = (__bridge RCTShadowText *)context;
NSTextStorage *textStorage = [shadowText buildTextStorageForWidth:width widthMode:widthMode];
NSLayoutManager *layoutManager = textStorage.layoutManagers.firstObject;
NSTextContainer *textContainer = layoutManager.textContainers.firstObject;
CGSize computedSize = [layoutManager usedRectForTextContainer:textContainer].size;
css_dim_t result;
result.dimensions[CSS_WIDTH] = RCTCeilPixelValue(computedSize.width);
if (shadowText->_effectiveLetterSpacing < 0) {
result.dimensions[CSS_WIDTH] -= shadowText->_effectiveLetterSpacing;
}
result.dimensions[CSS_HEIGHT] = RCTCeilPixelValue(computedSize.height);
return result;
}
- (instancetype)init
{
if ((self = [super init])) {
_fontSize = NAN;
_letterSpacing = NAN;
_isHighlighted = NO;
_textDecorationStyle = NSUnderlineStyleSingle;
_opacity = 1.0;
_cachedTextStorageWidth = -1;
_cachedTextStorageWidthMode = -1;
_fontSizeMultiplier = 1.0;
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(contentSizeMultiplierDidChange:)
name:RCTUIManagerWillUpdateViewsDueToContentSizeMultiplierChangeNotification
object:nil];
}
return self;
}
- (void)dealloc
{
[[NSNotificationCenter defaultCenter] removeObserver:self];
}
- (NSString *)description
{
NSString *superDescription = super.description;
return [[superDescription substringToIndex:superDescription.length - 1] stringByAppendingFormat:@"; text: %@>", [self attributedString].string];
}
- (void)contentSizeMultiplierDidChange:(NSNotification *)note
{
[self dirtyLayout];
[self dirtyText];
}
- (NSDictionary<NSString *, id> *)processUpdatedProperties:(NSMutableSet<RCTApplierBlock> *)applierBlocks
parentProperties:(NSDictionary<NSString *, id> *)parentProperties
{
parentProperties = [super processUpdatedProperties:applierBlocks
parentProperties:parentProperties];
UIEdgeInsets padding = self.paddingAsInsets;
CGFloat width = self.frame.size.width - (padding.left + padding.right);
NSTextStorage *textStorage = [self buildTextStorageForWidth:width widthMode:CSS_MEASURE_MODE_EXACTLY];
[applierBlocks addObject:^(NSDictionary<NSNumber *, RCTText *> *viewRegistry) {
RCTText *view = viewRegistry[self.reactTag];
view.textStorage = textStorage;
}];
return parentProperties;
}
- (void)applyLayoutNode:(css_node_t *)node
viewsWithNewFrame:(NSMutableSet<RCTShadowView *> *)viewsWithNewFrame
absolutePosition:(CGPoint)absolutePosition
{
[super applyLayoutNode:node viewsWithNewFrame:viewsWithNewFrame absolutePosition:absolutePosition];
[self dirtyPropagation];
}
- (NSTextStorage *)buildTextStorageForWidth:(CGFloat)width widthMode:(css_measure_mode_t)widthMode
{
if (_cachedTextStorage && width == _cachedTextStorageWidth && widthMode == _cachedTextStorageWidthMode) {
return _cachedTextStorage;
}
NSLayoutManager *layoutManager = [NSLayoutManager new];
NSTextStorage *textStorage = [[NSTextStorage alloc] initWithAttributedString:self.attributedString];
[textStorage addLayoutManager:layoutManager];
NSTextContainer *textContainer = [NSTextContainer new];
textContainer.lineFragmentPadding = 0.0;
textContainer.lineBreakMode = _numberOfLines > 0 ? NSLineBreakByTruncatingTail : NSLineBreakByClipping;
textContainer.maximumNumberOfLines = _numberOfLines;
textContainer.size = (CGSize){widthMode == CSS_MEASURE_MODE_UNDEFINED ? CGFLOAT_MAX : width, CGFLOAT_MAX};
[layoutManager addTextContainer:textContainer];
[layoutManager ensureLayoutForTextContainer:textContainer];
_cachedTextStorageWidth = width;
_cachedTextStorageWidthMode = widthMode;
_cachedTextStorage = textStorage;
return textStorage;
}
- (void)dirtyText
{
[super dirtyText];
_cachedTextStorage = nil;
}
- (void)recomputeText
{
[self attributedString];
[self setTextComputed];
[self dirtyPropagation];
}
- (NSAttributedString *)attributedString
{
return [self _attributedStringWithFontFamily:nil
fontSize:nil
fontWeight:nil
fontStyle:nil
letterSpacing:nil
useBackgroundColor:NO
foregroundColor:self.color ?: [UIColor blackColor]
backgroundColor:self.backgroundColor
opacity:self.opacity];
}
- (NSAttributedString *)_attributedStringWithFontFamily:(NSString *)fontFamily
fontSize:(NSNumber *)fontSize
fontWeight:(NSString *)fontWeight
fontStyle:(NSString *)fontStyle
letterSpacing:(NSNumber *)letterSpacing
useBackgroundColor:(BOOL)useBackgroundColor
foregroundColor:(UIColor *)foregroundColor
backgroundColor:(UIColor *)backgroundColor
opacity:(CGFloat)opacity
{
if (![self isTextDirty] && _cachedAttributedString) {
return _cachedAttributedString;
}
if (_fontSize && !isnan(_fontSize)) {
fontSize = @(_fontSize);
}
if (_fontWeight) {
fontWeight = _fontWeight;
}
if (_fontStyle) {
fontStyle = _fontStyle;
}
if (_fontFamily) {
fontFamily = _fontFamily;
}
if (!isnan(_letterSpacing)) {
letterSpacing = @(_letterSpacing);
}
_effectiveLetterSpacing = letterSpacing.doubleValue;
NSMutableAttributedString *attributedString = [NSMutableAttributedString new];
for (RCTShadowView *child in [self reactSubviews]) {
if ([child isKindOfClass:[RCTShadowText class]]) {
RCTShadowText *shadowText = (RCTShadowText *)child;
[attributedString appendAttributedString:
[shadowText _attributedStringWithFontFamily:fontFamily
fontSize:fontSize
fontWeight:fontWeight
fontStyle:fontStyle
letterSpacing:letterSpacing
useBackgroundColor:YES
foregroundColor:shadowText.color ?: foregroundColor
backgroundColor:shadowText.backgroundColor ?: backgroundColor
opacity:opacity * shadowText.opacity]];
} else if ([child isKindOfClass:[RCTShadowRawText class]]) {
RCTShadowRawText *shadowRawText = (RCTShadowRawText *)child;
[attributedString appendAttributedString:[[NSAttributedString alloc] initWithString:shadowRawText.text ?: @""]];
} else if ([child conformsToProtocol:@protocol(RCTImageComponent)]) {
UIImage *image = ((id<RCTImageComponent>)child).image;
if (image) {
NSTextAttachment *imageAttachment = [NSTextAttachment new];
imageAttachment.image = image;
[attributedString appendAttributedString:[NSAttributedString attributedStringWithAttachment:imageAttachment]];
}
} else {
RCTLogError(@"<Text> can't have any children except <Text>, <Image> or raw strings");
}
[child setTextComputed];
}
[self _addAttribute:NSForegroundColorAttributeName
withValue:[foregroundColor colorWithAlphaComponent:CGColorGetAlpha(foregroundColor.CGColor) * opacity]
toAttributedString:attributedString];
if (_isHighlighted) {
[self _addAttribute:RCTIsHighlightedAttributeName withValue:@YES toAttributedString:attributedString];
}
if (useBackgroundColor && backgroundColor) {
[self _addAttribute:NSBackgroundColorAttributeName
withValue:[backgroundColor colorWithAlphaComponent:CGColorGetAlpha(backgroundColor.CGColor) * opacity]
toAttributedString:attributedString];
}
UIFont *font = [RCTConvert UIFont:nil withFamily:fontFamily
size:fontSize weight:fontWeight style:fontStyle
scaleMultiplier:_allowFontScaling ? _fontSizeMultiplier : 1.0];
[self _addAttribute:NSFontAttributeName withValue:font toAttributedString:attributedString];
[self _addAttribute:NSKernAttributeName withValue:letterSpacing toAttributedString:attributedString];
[self _addAttribute:RCTReactTagAttributeName withValue:self.reactTag toAttributedString:attributedString];
[self _setParagraphStyleOnAttributedString:attributedString];
// create a non-mutable attributedString for use by the Text system which avoids copies down the line
_cachedAttributedString = [[NSAttributedString alloc] initWithAttributedString:attributedString];
[self dirtyLayout];
return _cachedAttributedString;
}
- (void)_addAttribute:(NSString *)attribute withValue:(id)attributeValue toAttributedString:(NSMutableAttributedString *)attributedString
{
[attributedString enumerateAttribute:attribute inRange:NSMakeRange(0, attributedString.length) options:0 usingBlock:^(id value, NSRange range, BOOL *stop) {
if (!value && attributeValue) {
[attributedString addAttribute:attribute value:attributeValue range:range];
}
}];
}
/*
* LineHeight works the same way line-height works in the web: if children and self have
* varying lineHeights, we simply take the max.
*/
- (void)_setParagraphStyleOnAttributedString:(NSMutableAttributedString *)attributedString
{
// check if we have lineHeight set on self
__block BOOL hasParagraphStyle = NO;
if (_lineHeight || _textAlign) {
hasParagraphStyle = YES;
}
if (!_lineHeight) {
self.lineHeight = 0.0;
}
CGFloat fontSizeMultiplier = _allowFontScaling ? _fontSizeMultiplier : 1.0;
// check for lineHeight on each of our children, update the max as we go (in self.lineHeight)
[attributedString enumerateAttribute:NSParagraphStyleAttributeName inRange:(NSRange){0, attributedString.length} options:0 usingBlock:^(id value, NSRange range, BOOL *stop) {
if (value) {
NSParagraphStyle *paragraphStyle = (NSParagraphStyle *)value;
CGFloat maximumLineHeight = round(paragraphStyle.maximumLineHeight / fontSizeMultiplier);
if (maximumLineHeight > self.lineHeight) {
self.lineHeight = maximumLineHeight;
}
hasParagraphStyle = YES;
}
}];
self.textAlign = _textAlign ?: NSTextAlignmentNatural;
self.writingDirection = _writingDirection ?: NSWritingDirectionNatural;
// if we found anything, set it :D
if (hasParagraphStyle) {
NSMutableParagraphStyle *paragraphStyle = [NSMutableParagraphStyle new];
paragraphStyle.alignment = _textAlign;
paragraphStyle.baseWritingDirection = _writingDirection;
CGFloat lineHeight = round(_lineHeight * fontSizeMultiplier);
paragraphStyle.minimumLineHeight = lineHeight;
paragraphStyle.maximumLineHeight = lineHeight;
[attributedString addAttribute:NSParagraphStyleAttributeName
value:paragraphStyle
range:(NSRange){0, attributedString.length}];
}
// Text decoration
if (_textDecorationLine == RCTTextDecorationLineTypeUnderline ||
_textDecorationLine == RCTTextDecorationLineTypeUnderlineStrikethrough) {
[self _addAttribute:NSUnderlineStyleAttributeName withValue:@(_textDecorationStyle)
toAttributedString:attributedString];
}
if (_textDecorationLine == RCTTextDecorationLineTypeStrikethrough ||
_textDecorationLine == RCTTextDecorationLineTypeUnderlineStrikethrough){
[self _addAttribute:NSStrikethroughStyleAttributeName withValue:@(_textDecorationStyle)
toAttributedString:attributedString];
}
if (_textDecorationColor) {
[self _addAttribute:NSStrikethroughColorAttributeName withValue:_textDecorationColor
toAttributedString:attributedString];
[self _addAttribute:NSUnderlineColorAttributeName withValue:_textDecorationColor
toAttributedString:attributedString];
}
// Text shadow
if (!CGSizeEqualToSize(_textShadowOffset, CGSizeZero)) {
NSShadow *shadow = [NSShadow new];
shadow.shadowOffset = _textShadowOffset;
shadow.shadowBlurRadius = _textShadowRadius;
shadow.shadowColor = _textShadowColor;
[self _addAttribute:NSShadowAttributeName withValue:shadow toAttributedString:attributedString];
}
}
- (void)fillCSSNode:(css_node_t *)node
{
[super fillCSSNode:node];
node->measure = RCTMeasure;
node->children_count = 0;
}
- (void)insertReactSubview:(RCTShadowView *)subview atIndex:(NSInteger)atIndex
{
[super insertReactSubview:subview atIndex:atIndex];
self.cssNode->children_count = 0;
}
- (void)removeReactSubview:(RCTShadowView *)subview
{
[super removeReactSubview:subview];
self.cssNode->children_count = 0;
}
- (void)setBackgroundColor:(UIColor *)backgroundColor
{
super.backgroundColor = backgroundColor;
[self dirtyText];
}
#define RCT_TEXT_PROPERTY(setProp, ivar, type) \
- (void)set##setProp:(type)value; \
{ \
ivar = value; \
[self dirtyText]; \
}
RCT_TEXT_PROPERTY(Color, _color, UIColor *)
RCT_TEXT_PROPERTY(FontFamily, _fontFamily, NSString *)
RCT_TEXT_PROPERTY(FontSize, _fontSize, CGFloat)
RCT_TEXT_PROPERTY(FontWeight, _fontWeight, NSString *)
RCT_TEXT_PROPERTY(FontStyle, _fontStyle, NSString *)
RCT_TEXT_PROPERTY(IsHighlighted, _isHighlighted, BOOL)
RCT_TEXT_PROPERTY(LetterSpacing, _letterSpacing, CGFloat)
RCT_TEXT_PROPERTY(LineHeight, _lineHeight, CGFloat)
RCT_TEXT_PROPERTY(NumberOfLines, _numberOfLines, NSUInteger)
RCT_TEXT_PROPERTY(TextAlign, _textAlign, NSTextAlignment)
RCT_TEXT_PROPERTY(TextDecorationColor, _textDecorationColor, UIColor *);
RCT_TEXT_PROPERTY(TextDecorationLine, _textDecorationLine, RCTTextDecorationLineType);
RCT_TEXT_PROPERTY(TextDecorationStyle, _textDecorationStyle, NSUnderlineStyle);
RCT_TEXT_PROPERTY(WritingDirection, _writingDirection, NSWritingDirection)
RCT_TEXT_PROPERTY(Opacity, _opacity, CGFloat)
RCT_TEXT_PROPERTY(TextShadowOffset, _textShadowOffset, CGSize);
RCT_TEXT_PROPERTY(TextShadowRadius, _textShadowRadius, CGFloat);
RCT_TEXT_PROPERTY(TextShadowColor, _textShadowColor, UIColor *);
- (void)setAllowFontScaling:(BOOL)allowFontScaling
{
_allowFontScaling = allowFontScaling;
for (RCTShadowView *child in [self reactSubviews]) {
if ([child isKindOfClass:[RCTShadowText class]]) {
((RCTShadowText *)child).allowFontScaling = allowFontScaling;
}
}
[self dirtyText];
}
- (void)setFontSizeMultiplier:(CGFloat)fontSizeMultiplier
{
_fontSizeMultiplier = fontSizeMultiplier;
if (_fontSizeMultiplier == 0) {
RCTLogError(@"fontSizeMultiplier value must be > zero.");
_fontSizeMultiplier = 1.0;
}
for (RCTShadowView *child in [self reactSubviews]) {
if ([child isKindOfClass:[RCTShadowText class]]) {
((RCTShadowText *)child).fontSizeMultiplier = fontSizeMultiplier;
}
}
[self dirtyText];
}
@end
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