693 lines
27 KiB
Objective-C
693 lines
27 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 "RCTShadowText.h"
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#import <React/RCTAccessibilityManager.h>
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#import <React/RCTBridge.h>
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#import <React/RCTConvert.h>
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#import <React/RCTFont.h>
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#import <React/RCTLog.h>
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#import <React/RCTShadowView+Layout.h>
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#import <React/RCTUIManager.h>
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#import <React/RCTUtils.h>
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#import "RCTShadowRawText.h"
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#import "RCTText.h"
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#import "RCTTextView.h"
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NSString *const RCTIsHighlightedAttributeName = @"IsHighlightedAttributeName";
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NSString *const RCTReactTagAttributeName = @"ReactTagAttributeName";
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static NSString *const kShadowViewAttributeName = @"RCTShadowViewAttributeName";
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static CGFloat const kAutoSizeWidthErrorMargin = 0.05f;
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static CGFloat const kAutoSizeHeightErrorMargin = 0.025f;
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static CGFloat const kAutoSizeGranularity = 0.001f;
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@implementation RCTShadowText
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{
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NSTextStorage *_cachedTextStorage;
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CGFloat _cachedTextStorageWidth;
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CGFloat _cachedTextStorageWidthMode;
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NSAttributedString *_cachedAttributedString;
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CGFloat _effectiveLetterSpacing;
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UIUserInterfaceLayoutDirection _cachedLayoutDirection;
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}
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static YGSize RCTMeasure(YGNodeRef node, float width, YGMeasureMode widthMode, float height, YGMeasureMode heightMode)
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{
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RCTShadowText *shadowText = (__bridge RCTShadowText *)YGNodeGetContext(node);
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NSTextStorage *textStorage = [shadowText buildTextStorageForWidth:width widthMode:widthMode];
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[shadowText calculateTextFrame:textStorage];
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NSLayoutManager *layoutManager = textStorage.layoutManagers.firstObject;
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NSTextContainer *textContainer = layoutManager.textContainers.firstObject;
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CGSize computedSize = [layoutManager usedRectForTextContainer:textContainer].size;
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YGSize result;
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result.width = RCTCeilPixelValue(computedSize.width);
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if (shadowText->_effectiveLetterSpacing < 0) {
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result.width -= shadowText->_effectiveLetterSpacing;
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}
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result.height = RCTCeilPixelValue(computedSize.height);
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return result;
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}
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- (instancetype)init
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{
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if ((self = [super init])) {
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_fontSize = NAN;
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_letterSpacing = NAN;
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_isHighlighted = NO;
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_textDecorationStyle = NSUnderlineStyleSingle;
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_opacity = 1.0;
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_cachedTextStorageWidth = -1;
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_cachedTextStorageWidthMode = -1;
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_fontSizeMultiplier = 1.0;
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_textAlign = NSTextAlignmentNatural;
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_writingDirection = NSWritingDirectionNatural;
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_cachedLayoutDirection = UIUserInterfaceLayoutDirectionLeftToRight;
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YGNodeSetMeasureFunc(self.yogaNode, RCTMeasure);
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[[NSNotificationCenter defaultCenter] addObserver:self
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selector:@selector(contentSizeMultiplierDidChange:)
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name:RCTUIManagerWillUpdateViewsDueToContentSizeMultiplierChangeNotification
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object:nil];
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}
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return self;
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}
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- (void)dealloc
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{
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[[NSNotificationCenter defaultCenter] removeObserver: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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return [[superDescription substringToIndex:superDescription.length - 1] stringByAppendingFormat:@"; text: %@>", [self attributedString].string];
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}
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- (BOOL)isYogaLeafNode
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{
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return YES;
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}
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- (void)contentSizeMultiplierDidChange:(NSNotification *)note
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{
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YGNodeMarkDirty(self.yogaNode);
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[self dirtyText];
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}
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- (NSDictionary<NSString *, id> *)processUpdatedProperties:(NSMutableSet<RCTApplierBlock> *)applierBlocks
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parentProperties:(NSDictionary<NSString *, id> *)parentProperties
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{
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if ([[self reactSuperview] isKindOfClass:[RCTShadowText class]]) {
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return parentProperties;
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}
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parentProperties = [super processUpdatedProperties:applierBlocks
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parentProperties:parentProperties];
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CGFloat availableWidth = self.availableSize.width;
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NSNumber *parentTag = [[self reactSuperview] reactTag];
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NSTextStorage *textStorage = [self buildTextStorageForWidth:availableWidth widthMode:YGMeasureModeExactly];
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CGRect textFrame = [self calculateTextFrame:textStorage];
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BOOL selectable = _selectable;
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[applierBlocks addObject:^(NSDictionary<NSNumber *, UIView *> *viewRegistry) {
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RCTText *view = (RCTText *)viewRegistry[self.reactTag];
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view.textFrame = textFrame;
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view.textStorage = textStorage;
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view.selectable = selectable;
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/**
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* NOTE: this logic is included to support rich text editing inside multiline
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* `<TextInput>` controls. It is required in order to ensure that the
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* textStorage (aka attributed string) is copied over from the RCTShadowText
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* to the RCTText view in time to be used to update the editable text content.
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* TODO: we should establish a delegate relationship betweeen RCTTextView
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* and its contaned RCTText element when they get inserted and get rid of this
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*/
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UIView *parentView = viewRegistry[parentTag];
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if ([parentView respondsToSelector:@selector(performTextUpdate)]) {
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[(RCTTextView *)parentView performTextUpdate];
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}
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}];
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return parentProperties;
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}
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- (void)applyLayoutNode:(YGNodeRef)node
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viewsWithNewFrame:(NSMutableSet<RCTShadowView *> *)viewsWithNewFrame
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absolutePosition:(CGPoint)absolutePosition
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{
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[super applyLayoutNode:node viewsWithNewFrame:viewsWithNewFrame absolutePosition:absolutePosition];
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[self dirtyPropagation];
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}
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- (void)applyLayoutToChildren:(YGNodeRef)node
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viewsWithNewFrame:(NSMutableSet<RCTShadowView *> *)viewsWithNewFrame
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absolutePosition:(CGPoint)absolutePosition
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{
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// Run layout on subviews.
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CGFloat availableWidth = self.availableSize.width;
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NSTextStorage *textStorage = [self buildTextStorageForWidth:availableWidth widthMode:YGMeasureModeExactly];
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NSLayoutManager *layoutManager = textStorage.layoutManagers.firstObject;
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NSTextContainer *textContainer = layoutManager.textContainers.firstObject;
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NSRange glyphRange = [layoutManager glyphRangeForTextContainer:textContainer];
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NSRange characterRange = [layoutManager characterRangeForGlyphRange:glyphRange actualGlyphRange:NULL];
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[layoutManager.textStorage enumerateAttribute:kShadowViewAttributeName inRange:characterRange options:0 usingBlock:^(RCTShadowView *child, NSRange range, BOOL *_) {
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if (child) {
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YGNodeRef childNode = child.yogaNode;
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float width = YGNodeStyleGetWidth(childNode).value;
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float height = YGNodeStyleGetHeight(childNode).value;
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if (YGFloatIsUndefined(width) || YGFloatIsUndefined(height)) {
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RCTLogError(@"Views nested within a <Text> must have a width and height");
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}
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UIFont *font = [textStorage attribute:NSFontAttributeName atIndex:range.location effectiveRange:nil];
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CGRect glyphRect = [layoutManager boundingRectForGlyphRange:range inTextContainer:textContainer];
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CGRect childFrame = {{
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RCTRoundPixelValue(glyphRect.origin.x),
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RCTRoundPixelValue(glyphRect.origin.y + glyphRect.size.height - height + font.descender)
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}, {
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RCTRoundPixelValue(width),
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RCTRoundPixelValue(height)
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}};
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NSRange truncatedGlyphRange = [layoutManager truncatedGlyphRangeInLineFragmentForGlyphAtIndex:range.location];
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BOOL childIsTruncated = NSIntersectionRange(range, truncatedGlyphRange).length != 0;
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[child collectUpdatedFrames:viewsWithNewFrame
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withFrame:childFrame
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hidden:childIsTruncated
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absolutePosition:absolutePosition];
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}
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}];
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}
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- (NSTextStorage *)buildTextStorageForWidth:(CGFloat)width widthMode:(YGMeasureMode)widthMode
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{
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if (
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_cachedTextStorage &&
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(width == _cachedTextStorageWidth || (isnan(width) && isnan(_cachedTextStorageWidth))) &&
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widthMode == _cachedTextStorageWidthMode &&
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_cachedLayoutDirection == self.layoutDirection
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) {
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return _cachedTextStorage;
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}
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NSLayoutManager *layoutManager = [NSLayoutManager new];
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NSTextStorage *textStorage = [[NSTextStorage alloc] initWithAttributedString:self.attributedString];
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[textStorage addLayoutManager:layoutManager];
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NSTextContainer *textContainer = [NSTextContainer new];
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textContainer.lineFragmentPadding = 0.0;
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if (_numberOfLines > 0) {
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textContainer.lineBreakMode = _ellipsizeMode;
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} else {
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textContainer.lineBreakMode = NSLineBreakByClipping;
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}
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textContainer.maximumNumberOfLines = _numberOfLines;
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textContainer.size = (CGSize){
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widthMode == YGMeasureModeUndefined || isnan(width) ? CGFLOAT_MAX : width,
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CGFLOAT_MAX
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};
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[layoutManager addTextContainer:textContainer];
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[layoutManager ensureLayoutForTextContainer:textContainer];
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_cachedTextStorageWidth = width;
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_cachedTextStorageWidthMode = widthMode;
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_cachedTextStorage = textStorage;
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return textStorage;
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}
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- (void)dirtyText
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{
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[super dirtyText];
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_cachedTextStorage = nil;
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}
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- (void)recomputeText
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{
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[self attributedString];
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[self setTextComputed];
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[self dirtyPropagation];
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}
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- (NSAttributedString *)attributedString
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{
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return [self _attributedStringWithFontFamily:nil
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fontSize:nil
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fontWeight:nil
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fontStyle:nil
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letterSpacing:nil
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useBackgroundColor:NO
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foregroundColor:self.color ?: [UIColor blackColor]
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backgroundColor:self.backgroundColor
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opacity:self.opacity];
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}
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- (NSAttributedString *)_attributedStringWithFontFamily:(NSString *)fontFamily
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fontSize:(NSNumber *)fontSize
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fontWeight:(NSString *)fontWeight
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fontStyle:(NSString *)fontStyle
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letterSpacing:(NSNumber *)letterSpacing
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useBackgroundColor:(BOOL)useBackgroundColor
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foregroundColor:(UIColor *)foregroundColor
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backgroundColor:(UIColor *)backgroundColor
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opacity:(CGFloat)opacity
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{
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if (
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![self isTextDirty] &&
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_cachedAttributedString &&
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_cachedLayoutDirection == self.layoutDirection
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) {
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return _cachedAttributedString;
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}
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_cachedLayoutDirection = self.layoutDirection;
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if (_fontSize && !isnan(_fontSize)) {
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fontSize = @(_fontSize);
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}
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if (_fontWeight) {
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fontWeight = _fontWeight;
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}
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if (_fontStyle) {
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fontStyle = _fontStyle;
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}
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if (_fontFamily) {
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fontFamily = _fontFamily;
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}
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if (!isnan(_letterSpacing)) {
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letterSpacing = @(_letterSpacing);
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}
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_effectiveLetterSpacing = letterSpacing.doubleValue;
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UIFont *font = [RCTFont updateFont:nil
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withFamily:fontFamily
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size:fontSize
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weight:fontWeight
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style:fontStyle
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variant:_fontVariant
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scaleMultiplier:_allowFontScaling ? _fontSizeMultiplier : 1.0];
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CGFloat heightOfTallestSubview = 0.0;
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NSMutableAttributedString *attributedString = [NSMutableAttributedString new];
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for (RCTShadowView *child in [self reactSubviews]) {
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if ([child isKindOfClass:[RCTShadowText class]]) {
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RCTShadowText *shadowText = (RCTShadowText *)child;
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[attributedString appendAttributedString:
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[shadowText _attributedStringWithFontFamily:fontFamily
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fontSize:fontSize
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fontWeight:fontWeight
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fontStyle:fontStyle
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letterSpacing:letterSpacing
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useBackgroundColor:YES
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foregroundColor:shadowText.color ?: foregroundColor
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backgroundColor:shadowText.backgroundColor ?: backgroundColor
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opacity:opacity * shadowText.opacity]];
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[child setTextComputed];
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} else if ([child isKindOfClass:[RCTShadowRawText class]]) {
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RCTShadowRawText *shadowRawText = (RCTShadowRawText *)child;
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[attributedString appendAttributedString:[[NSAttributedString alloc] initWithString:shadowRawText.text ?: @""]];
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[child setTextComputed];
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} else {
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float width = YGNodeStyleGetWidth(child.yogaNode).value;
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float height = YGNodeStyleGetHeight(child.yogaNode).value;
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if (YGFloatIsUndefined(width) || YGFloatIsUndefined(height)) {
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RCTLogError(@"Views nested within a <Text> must have a width and height");
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}
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NSTextAttachment *attachment = [NSTextAttachment new];
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attachment.bounds = (CGRect){CGPointZero, {width, height}};
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NSMutableAttributedString *attachmentString = [NSMutableAttributedString new];
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[attachmentString appendAttributedString:[NSAttributedString attributedStringWithAttachment:attachment]];
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[attachmentString addAttribute:kShadowViewAttributeName value:child range:(NSRange){0, attachmentString.length}];
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[attributedString appendAttributedString:attachmentString];
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if (height > heightOfTallestSubview) {
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heightOfTallestSubview = height;
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}
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// Don't call setTextComputed on this child. RCTTextManager takes care of
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// processing inline UIViews.
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}
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}
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[self _addAttribute:NSForegroundColorAttributeName
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withValue:[foregroundColor colorWithAlphaComponent:CGColorGetAlpha(foregroundColor.CGColor) * opacity]
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toAttributedString:attributedString];
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if (_isHighlighted) {
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[self _addAttribute:RCTIsHighlightedAttributeName withValue:@YES toAttributedString:attributedString];
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}
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if (useBackgroundColor && backgroundColor) {
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[self _addAttribute:NSBackgroundColorAttributeName
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withValue:[backgroundColor colorWithAlphaComponent:CGColorGetAlpha(backgroundColor.CGColor) * opacity]
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toAttributedString:attributedString];
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}
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[self _addAttribute:NSFontAttributeName withValue:font toAttributedString:attributedString];
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[self _addAttribute:NSKernAttributeName withValue:letterSpacing toAttributedString:attributedString];
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[self _addAttribute:RCTReactTagAttributeName withValue:self.reactTag toAttributedString:attributedString];
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[self _setParagraphStyleOnAttributedString:attributedString
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fontLineHeight:font.lineHeight
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heightOfTallestSubview:heightOfTallestSubview];
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// create a non-mutable attributedString for use by the Text system which avoids copies down the line
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_cachedAttributedString = [[NSAttributedString alloc] initWithAttributedString:attributedString];
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YGNodeMarkDirty(self.yogaNode);
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return _cachedAttributedString;
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}
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- (void)_addAttribute:(NSString *)attribute withValue:(id)attributeValue toAttributedString:(NSMutableAttributedString *)attributedString
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{
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[attributedString enumerateAttribute:attribute inRange:NSMakeRange(0, attributedString.length) options:0 usingBlock:^(id value, NSRange range, BOOL *stop) {
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if (!value && attributeValue) {
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[attributedString addAttribute:attribute value:attributeValue range:range];
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}
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}];
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}
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/*
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* LineHeight works the same way line-height works in the web: if children and self have
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* varying lineHeights, we simply take the max.
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*/
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- (void)_setParagraphStyleOnAttributedString:(NSMutableAttributedString *)attributedString
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fontLineHeight:(CGFloat)fontLineHeight
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heightOfTallestSubview:(CGFloat)heightOfTallestSubview
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{
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__block BOOL hasParagraphStyle = NO;
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if (_lineHeight != 0.0 || _textAlign != NSTextAlignmentNatural) {
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hasParagraphStyle = YES;
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}
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CGFloat fontSizeMultiplier = _allowFontScaling ? _fontSizeMultiplier : 1.0;
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// Text line height
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__block float compoundLineHeight = _lineHeight * fontSizeMultiplier;
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// Checking for `maximumLineHeight` on each of our children and updating `compoundLineHeight` with the maximum value on the go.
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[attributedString enumerateAttribute:NSParagraphStyleAttributeName
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inRange:(NSRange){0, attributedString.length}
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options:0
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usingBlock:^(NSParagraphStyle *paragraphStyle, NSRange range, BOOL *stop) {
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if (!paragraphStyle) {
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return;
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}
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hasParagraphStyle = YES;
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compoundLineHeight = MAX(compoundLineHeight, paragraphStyle.maximumLineHeight);
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}];
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compoundLineHeight = MAX(round(compoundLineHeight), ceilf(heightOfTallestSubview));
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// Text alignment
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NSTextAlignment textAlign = _textAlign;
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if (textAlign == NSTextAlignmentRight || textAlign == NSTextAlignmentLeft) {
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if (_cachedLayoutDirection == UIUserInterfaceLayoutDirectionRightToLeft) {
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if (textAlign == NSTextAlignmentRight) {
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textAlign = NSTextAlignmentLeft;
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} else {
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textAlign = NSTextAlignmentRight;
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}
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}
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}
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if (hasParagraphStyle) {
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NSMutableParagraphStyle *paragraphStyle = [NSMutableParagraphStyle new];
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paragraphStyle.alignment = textAlign;
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paragraphStyle.baseWritingDirection = _writingDirection;
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paragraphStyle.minimumLineHeight = compoundLineHeight;
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paragraphStyle.maximumLineHeight = compoundLineHeight;
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[attributedString addAttribute:NSParagraphStyleAttributeName
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value:paragraphStyle
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range:(NSRange){0, attributedString.length}];
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if (compoundLineHeight > fontLineHeight) {
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[attributedString addAttribute:NSBaselineOffsetAttributeName
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value:@(compoundLineHeight / 2 - fontLineHeight / 2)
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range:(NSRange){0, attributedString.length}];
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}
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}
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// Text decoration
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if (_textDecorationLine == RCTTextDecorationLineTypeUnderline ||
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_textDecorationLine == RCTTextDecorationLineTypeUnderlineStrikethrough) {
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[self _addAttribute:NSUnderlineStyleAttributeName withValue:@(_textDecorationStyle)
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toAttributedString:attributedString];
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}
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if (_textDecorationLine == RCTTextDecorationLineTypeStrikethrough ||
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_textDecorationLine == RCTTextDecorationLineTypeUnderlineStrikethrough){
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[self _addAttribute:NSStrikethroughStyleAttributeName withValue:@(_textDecorationStyle)
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toAttributedString:attributedString];
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}
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if (_textDecorationColor) {
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[self _addAttribute:NSStrikethroughColorAttributeName withValue:_textDecorationColor
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toAttributedString:attributedString];
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[self _addAttribute:NSUnderlineColorAttributeName withValue:_textDecorationColor
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toAttributedString:attributedString];
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}
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// Text shadow
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if (!CGSizeEqualToSize(_textShadowOffset, CGSizeZero)) {
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NSShadow *shadow = [NSShadow new];
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shadow.shadowOffset = _textShadowOffset;
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shadow.shadowBlurRadius = _textShadowRadius;
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shadow.shadowColor = _textShadowColor;
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[self _addAttribute:NSShadowAttributeName withValue:shadow toAttributedString:attributedString];
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}
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}
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#pragma mark Autosizing
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- (CGRect)calculateTextFrame:(NSTextStorage *)textStorage
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{
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CGRect textFrame = UIEdgeInsetsInsetRect((CGRect){CGPointZero, self.frame.size},
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self.compoundInsets);
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if (_adjustsFontSizeToFit) {
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textFrame = [self updateStorage:textStorage toFitFrame:textFrame];
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}
|
|
|
|
return textFrame;
|
|
}
|
|
|
|
- (CGRect)updateStorage:(NSTextStorage *)textStorage toFitFrame:(CGRect)frame
|
|
{
|
|
BOOL fits = [self attemptScale:1.0f
|
|
inStorage:textStorage
|
|
forFrame:frame];
|
|
CGSize requiredSize;
|
|
if (!fits) {
|
|
requiredSize = [self calculateOptimumScaleInFrame:frame
|
|
forStorage:textStorage
|
|
minScale:self.minimumFontScale
|
|
maxScale:1.0
|
|
prevMid:INT_MAX];
|
|
} else {
|
|
requiredSize = [self calculateSize:textStorage];
|
|
}
|
|
|
|
// Vertically center draw position for new text sizing.
|
|
frame.origin.y = self.compoundInsets.top + RCTRoundPixelValue((CGRectGetHeight(frame) - requiredSize.height) / 2.0f);
|
|
return frame;
|
|
}
|
|
|
|
- (CGSize)calculateOptimumScaleInFrame:(CGRect)frame
|
|
forStorage:(NSTextStorage *)textStorage
|
|
minScale:(CGFloat)minScale
|
|
maxScale:(CGFloat)maxScale
|
|
prevMid:(CGFloat)prevMid
|
|
{
|
|
CGFloat midScale = (minScale + maxScale) / 2.0f;
|
|
if (round((prevMid / kAutoSizeGranularity)) == round((midScale / kAutoSizeGranularity))) {
|
|
//Bail because we can't meet error margin.
|
|
return [self calculateSize:textStorage];
|
|
} else {
|
|
RCTSizeComparison comparison = [self attemptScale:midScale
|
|
inStorage:textStorage
|
|
forFrame:frame];
|
|
if (comparison == RCTSizeWithinRange) {
|
|
return [self calculateSize:textStorage];
|
|
} else if (comparison == RCTSizeTooLarge) {
|
|
return [self calculateOptimumScaleInFrame:frame
|
|
forStorage:textStorage
|
|
minScale:minScale
|
|
maxScale:midScale - kAutoSizeGranularity
|
|
prevMid:midScale];
|
|
} else {
|
|
return [self calculateOptimumScaleInFrame:frame
|
|
forStorage:textStorage
|
|
minScale:midScale + kAutoSizeGranularity
|
|
maxScale:maxScale
|
|
prevMid:midScale];
|
|
}
|
|
}
|
|
}
|
|
|
|
- (RCTSizeComparison)attemptScale:(CGFloat)scale
|
|
inStorage:(NSTextStorage *)textStorage
|
|
forFrame:(CGRect)frame
|
|
{
|
|
NSLayoutManager *layoutManager = [textStorage.layoutManagers firstObject];
|
|
NSTextContainer *textContainer = [layoutManager.textContainers firstObject];
|
|
|
|
NSRange glyphRange = NSMakeRange(0, textStorage.length);
|
|
[textStorage beginEditing];
|
|
[textStorage enumerateAttribute:NSFontAttributeName
|
|
inRange:glyphRange
|
|
options:0
|
|
usingBlock:^(UIFont *font, NSRange range, BOOL *stop)
|
|
{
|
|
if (font) {
|
|
UIFont *originalFont = [self.attributedString attribute:NSFontAttributeName
|
|
atIndex:range.location
|
|
effectiveRange:&range];
|
|
UIFont *newFont = [font fontWithSize:originalFont.pointSize * scale];
|
|
[textStorage removeAttribute:NSFontAttributeName range:range];
|
|
[textStorage addAttribute:NSFontAttributeName value:newFont range:range];
|
|
}
|
|
}];
|
|
|
|
[textStorage endEditing];
|
|
|
|
NSInteger linesRequired = [self numberOfLinesRequired:[textStorage.layoutManagers firstObject]];
|
|
CGSize requiredSize = [self calculateSize:textStorage];
|
|
|
|
BOOL fitSize = requiredSize.height <= CGRectGetHeight(frame) &&
|
|
requiredSize.width <= CGRectGetWidth(frame);
|
|
|
|
BOOL fitLines = linesRequired <= textContainer.maximumNumberOfLines ||
|
|
textContainer.maximumNumberOfLines == 0;
|
|
|
|
if (fitLines && fitSize) {
|
|
if ((requiredSize.width + (CGRectGetWidth(frame) * kAutoSizeWidthErrorMargin)) > CGRectGetWidth(frame) &&
|
|
(requiredSize.height + (CGRectGetHeight(frame) * kAutoSizeHeightErrorMargin)) > CGRectGetHeight(frame))
|
|
{
|
|
return RCTSizeWithinRange;
|
|
} else {
|
|
return RCTSizeTooSmall;
|
|
}
|
|
} else {
|
|
return RCTSizeTooLarge;
|
|
}
|
|
}
|
|
|
|
// Via Apple Text Layout Programming Guide
|
|
// https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/TextLayout/Tasks/CountLines.html
|
|
- (NSInteger)numberOfLinesRequired:(NSLayoutManager *)layoutManager
|
|
{
|
|
NSInteger numberOfLines, index, numberOfGlyphs = [layoutManager numberOfGlyphs];
|
|
NSRange lineRange;
|
|
for (numberOfLines = 0, index = 0; index < numberOfGlyphs; numberOfLines++){
|
|
(void) [layoutManager lineFragmentRectForGlyphAtIndex:index
|
|
effectiveRange:&lineRange];
|
|
index = NSMaxRange(lineRange);
|
|
}
|
|
|
|
return numberOfLines;
|
|
}
|
|
|
|
// Via Apple Text Layout Programming Guide
|
|
//https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/TextLayout/Tasks/StringHeight.html
|
|
- (CGSize)calculateSize:(NSTextStorage *)storage
|
|
{
|
|
NSLayoutManager *layoutManager = [storage.layoutManagers firstObject];
|
|
NSTextContainer *textContainer = [layoutManager.textContainers firstObject];
|
|
|
|
[textContainer setLineBreakMode:NSLineBreakByWordWrapping];
|
|
NSInteger maxLines = [textContainer maximumNumberOfLines];
|
|
[textContainer setMaximumNumberOfLines:0];
|
|
(void) [layoutManager glyphRangeForTextContainer:textContainer];
|
|
CGSize requiredSize = [layoutManager usedRectForTextContainer:textContainer].size;
|
|
[textContainer setMaximumNumberOfLines:maxLines];
|
|
|
|
return requiredSize;
|
|
}
|
|
|
|
- (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(AdjustsFontSizeToFit, _adjustsFontSizeToFit, BOOL)
|
|
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(FontVariant, _fontVariant, NSArray *)
|
|
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(EllipsizeMode, _ellipsizeMode, NSLineBreakMode)
|
|
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];
|
|
}
|
|
|
|
- (void)setMinimumFontScale:(CGFloat)minimumFontScale
|
|
{
|
|
if (minimumFontScale >= 0.01) {
|
|
_minimumFontScale = minimumFontScale;
|
|
}
|
|
[self dirtyText];
|
|
}
|
|
|
|
@end
|