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git-subtree-dir: submodules/AsyncDisplayKit git-subtree-mainline: d06f423e0ed3df1fed9bd10d79ee312a9179b632 git-subtree-split: 02bedc12816e251ad71777f9d2578329b6d2bef6
105 lines
3.9 KiB
Plaintext
105 lines
3.9 KiB
Plaintext
//
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// ASTextKitRenderer+TextChecking.mm
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// Texture
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//
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// Copyright (c) Facebook, Inc. and its affiliates. All rights reserved.
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// Changes after 4/13/2017 are: Copyright (c) Pinterest, Inc. All rights reserved.
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// Licensed under Apache 2.0: http://www.apache.org/licenses/LICENSE-2.0
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//
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#import <AsyncDisplayKit/ASTextKitRenderer+TextChecking.h>
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#if AS_ENABLE_TEXTNODE
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#import <AsyncDisplayKit/ASTextKitEntityAttribute.h>
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#import <AsyncDisplayKit/ASTextKitRenderer+Positioning.h>
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#import <AsyncDisplayKit/ASTextKitTailTruncater.h>
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@implementation ASTextKitTextCheckingResult
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{
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// Be explicit about the fact that we are overriding the super class' implementation of -range and -resultType
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// and substituting our own custom values. (We could use @synthesize to make these ivars, but our linter correctly
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// complains; it's weird to use @synthesize for properties that are redeclared on top of an original declaration in
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// the superclass. We only do it here because NSTextCheckingResult doesn't expose an initializer, which is silly.)
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NSRange _rangeOverride;
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NSTextCheckingType _resultTypeOverride;
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}
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- (instancetype)initWithType:(NSTextCheckingType)type
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entityAttribute:(ASTextKitEntityAttribute *)entityAttribute
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range:(NSRange)range
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{
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if ((self = [super init])) {
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_resultTypeOverride = type;
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_rangeOverride = range;
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_entityAttribute = entityAttribute;
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}
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return self;
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}
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- (NSTextCheckingType)resultType
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{
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return _resultTypeOverride;
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}
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- (NSRange)range
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{
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return _rangeOverride;
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}
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@end
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@implementation ASTextKitRenderer (TextChecking)
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- (NSTextCheckingResult *)textCheckingResultAtPoint:(CGPoint)point
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{
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__block NSTextCheckingResult *result = nil;
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NSAttributedString *attributedString = self.attributes.attributedString;
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NSAttributedString *truncationAttributedString = self.attributes.truncationAttributedString;
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// get the index of the last character, so we can handle text in the truncation token
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__block NSRange truncationTokenRange = { NSNotFound, 0 };
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[truncationAttributedString enumerateAttribute:ASTextKitTruncationAttributeName inRange:NSMakeRange(0, truncationAttributedString.length)
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options:0
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usingBlock:^(id value, NSRange range, BOOL *stop) {
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if (value != nil && range.length > 0) {
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truncationTokenRange = range;
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}
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}];
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if (truncationTokenRange.location == NSNotFound) {
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// The truncation string didn't specify a substring which should be highlighted, so we just highlight it all
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truncationTokenRange = { 0, truncationAttributedString.length };
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}
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NSRange visibleRange = self.truncater.firstVisibleRange;
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truncationTokenRange.location += NSMaxRange(visibleRange);
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__block CGFloat minDistance = CGFLOAT_MAX;
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[self enumerateTextIndexesAtPosition:point usingBlock:^(NSUInteger index, CGRect glyphBoundingRect, BOOL *stop){
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if (index >= truncationTokenRange.location) {
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result = [[ASTextKitTextCheckingResult alloc] initWithType:ASTextKitTextCheckingTypeTruncation
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entityAttribute:nil
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range:truncationTokenRange];
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} else {
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NSRange range;
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NSDictionary *attributes = [attributedString attributesAtIndex:index effectiveRange:&range];
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ASTextKitEntityAttribute *entityAttribute = attributes[ASTextKitEntityAttributeName];
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CGFloat distance = hypot(CGRectGetMidX(glyphBoundingRect) - point.x, CGRectGetMidY(glyphBoundingRect) - point.y);
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if (entityAttribute && distance < minDistance) {
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result = [[ASTextKitTextCheckingResult alloc] initWithType:ASTextKitTextCheckingTypeEntity
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entityAttribute:entityAttribute
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range:range];
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minDistance = distance;
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}
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}
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}];
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return result;
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}
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@end
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#endif
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