mirror of
https://github.com/Swiftgram/Telegram-iOS.git
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150 lines
4.2 KiB
Objective-C
150 lines
4.2 KiB
Objective-C
/*
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* Copyright (c) 2014-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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*/
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#import "ASLayoutOptions.h"
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#import <AsyncDisplayKit/ASAssert.h>
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#import <AsyncDisplayKit/ASTextNode.h>
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#import "ASInternalHelpers.h"
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@implementation ASLayoutOptions
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static Class gDefaultLayoutOptionsClass = nil;
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+ (void)setDefaultLayoutOptionsClass:(Class)defaultLayoutOptionsClass
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{
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gDefaultLayoutOptionsClass = defaultLayoutOptionsClass;
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}
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+ (Class)defaultLayoutOptionsClass
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{
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static dispatch_once_t onceToken;
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dispatch_once(&onceToken, ^{
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if (gDefaultLayoutOptionsClass == nil) {
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// If someone is asking for this and it hasn't been customized yet, use the default.
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gDefaultLayoutOptionsClass = [ASLayoutOptions class];
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}
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});
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return gDefaultLayoutOptionsClass;
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}
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- (instancetype)init
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{
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return [self initWithLayoutable:nil];
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}
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- (instancetype)initWithLayoutable:(id<ASLayoutable>)layoutable;
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{
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self = [super init];
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if (self) {
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[self setupDefaults];
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[self setValuesFromLayoutable:layoutable];
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_isMutable = YES;
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#if DEBUG
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[self addObserver:self
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forKeyPath:@"changeMonitor"
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options:NSKeyValueObservingOptionNew
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context:nil];
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#endif
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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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#if DEBUG
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[self removeObserver:self forKeyPath:@"changeMonitor"];
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#endif
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}
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#if DEBUG
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+ (NSSet *)keyPathsForValuesAffectingChangeMonitor
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{
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NSMutableSet *keys = [NSMutableSet set];
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[keys addObjectsFromArray:@[@"spacingBefore", @"spacingAfter", @"flexGrow", @"flexShrink", @"flexBasis", @"alignSelf"]];
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[keys addObjectsFromArray:@[@"ascender", @"descender"]];
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[keys addObjectsFromArray:@[@"sizeRange", @"layoutPosition"]];
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return keys;
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}
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#endif
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- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
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{
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#if DEBUG
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if ([keyPath isEqualToString:@"changeMonitor"]) {
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ASDisplayNodeAssert(self.isMutable, @"You cannot alter this class once it is marked as immutable");
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} else
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#endif
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{
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[super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
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}
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}
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#pragma mark - NSCopying
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- (id)copyWithZone:(NSZone *)zone
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{
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ASLayoutOptions *copy = [[[self class] alloc] init];
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[self copyIntoOptions:copy];
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return copy;
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}
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- (void)copyIntoOptions:(ASLayoutOptions *)copy
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{
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copy.flexBasis = self.flexBasis;
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copy.spacingAfter = self.spacingAfter;
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copy.spacingBefore = self.spacingBefore;
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copy.flexGrow = self.flexGrow;
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copy.flexShrink = self.flexShrink;
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copy.ascender = self.ascender;
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copy.descender = self.descender;
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copy.sizeRange = self.sizeRange;
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copy.layoutPosition = self.layoutPosition;
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}
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#pragma mark - Defaults
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- (void)setupDefaults
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{
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_flexBasis = ASRelativeDimensionUnconstrained;
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_spacingBefore = 0;
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_spacingAfter = 0;
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_flexGrow = NO;
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_flexShrink = NO;
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_alignSelf = ASStackLayoutAlignSelfAuto;
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_ascender = 0;
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_descender = 0;
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_sizeRange = ASRelativeSizeRangeMake(ASRelativeSizeMakeWithCGSize(CGSizeZero), ASRelativeSizeMakeWithCGSize(CGSizeZero));
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_layoutPosition = CGPointZero;
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}
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// Do this here instead of in Node/Spec subclasses so that custom specs can set default values
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- (void)setValuesFromLayoutable:(id<ASLayoutable>)layoutable
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{
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if ([layoutable isKindOfClass:[ASTextNode class]]) {
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ASTextNode *textNode = (ASTextNode *)layoutable;
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self.ascender = round([[textNode.attributedString attribute:NSFontAttributeName atIndex:0 effectiveRange:NULL] ascender] * ASScreenScale())/ASScreenScale();
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self.descender = round([[textNode.attributedString attribute:NSFontAttributeName atIndex:textNode.attributedString.length - 1 effectiveRange:NULL] descender] * ASScreenScale())/ASScreenScale();
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}
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if ([layoutable isKindOfClass:[ASDisplayNode class]]) {
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ASDisplayNode *displayNode = (ASDisplayNode *)layoutable;
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self.sizeRange = ASRelativeSizeRangeMake(ASRelativeSizeMakeWithCGSize(displayNode.preferredFrameSize), ASRelativeSizeMakeWithCGSize(displayNode.preferredFrameSize));
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self.layoutPosition = displayNode.frame.origin;
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}
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}
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@end
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