108 lines
2.9 KiB
Objective-C
108 lines
2.9 KiB
Objective-C
/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#import "RCTTouchEvent.h"
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#import "RCTAssert.h"
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@implementation RCTTouchEvent {
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NSArray<NSDictionary *> *_reactTouches;
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NSArray<NSNumber *> *_changedIndexes;
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uint16_t _coalescingKey;
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}
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@synthesize eventName = _eventName;
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@synthesize viewTag = _viewTag;
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- (instancetype)initWithEventName:(NSString *)eventName
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reactTag:(NSNumber *)reactTag
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reactTouches:(NSArray<NSDictionary *> *)reactTouches
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changedIndexes:(NSArray<NSNumber *> *)changedIndexes
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coalescingKey:(uint16_t)coalescingKey
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{
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if (self = [super init]) {
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_viewTag = reactTag;
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_eventName = eventName;
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_reactTouches = reactTouches;
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_changedIndexes = changedIndexes;
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_coalescingKey = coalescingKey;
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}
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return self;
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}
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RCT_NOT_IMPLEMENTED(-(instancetype)init)
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#pragma mark - RCTEvent
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- (BOOL)canCoalesce
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{
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return [_eventName isEqual:@"touchMove"];
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}
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// We coalesce only move events, while holding some assumptions that seem reasonable but there are no explicit
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// guarantees about them.
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- (id<RCTEvent>)coalesceWithEvent:(id<RCTEvent>)newEvent
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{
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RCTAssert(
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[newEvent isKindOfClass:[RCTTouchEvent class]],
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@"Touch event cannot be coalesced with any other type of event, such as provided %@",
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newEvent);
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RCTTouchEvent *newTouchEvent = (RCTTouchEvent *)newEvent;
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RCTAssert(
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[_reactTouches count] == [newTouchEvent->_reactTouches count],
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@"Touch events have different number of touches. %@ %@",
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self,
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newEvent);
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BOOL newEventIsMoreRecent = NO;
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BOOL oldEventIsMoreRecent = NO;
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NSInteger count = _reactTouches.count;
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for (int i = 0; i < count; i++) {
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NSDictionary *touch = _reactTouches[i];
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NSDictionary *newTouch = newTouchEvent->_reactTouches[i];
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RCTAssert(
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[touch[@"identifier"] isEqual:newTouch[@"identifier"]],
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@"Touch events doesn't have touches in the same order. %@ %@",
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touch,
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newTouch);
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if ([touch[@"timestamp"] doubleValue] > [newTouch[@"timestamp"] doubleValue]) {
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oldEventIsMoreRecent = YES;
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} else {
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newEventIsMoreRecent = YES;
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}
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}
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RCTAssert(
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!(oldEventIsMoreRecent && newEventIsMoreRecent),
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@"Neither touch event is exclusively more recent than the other one. %@ %@",
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_reactTouches,
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newTouchEvent->_reactTouches);
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return newEventIsMoreRecent ? newEvent : self;
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}
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+ (NSString *)moduleDotMethod
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{
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return @"RCTEventEmitter.receiveTouches";
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}
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- (NSArray *)arguments
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{
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return @[ RCTNormalizeInputEventName(_eventName), _reactTouches, _changedIndexes ];
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}
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- (uint16_t)coalescingKey
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{
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return _coalescingKey;
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}
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- (NSString *)description
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{
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return [NSString
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stringWithFormat:@"<%@: %p; name = %@; coalescing key = %hu>", [self class], self, _eventName, _coalescingKey];
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}
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@end
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