react-native/React/Base/RCTTouchEvent.m

91 lines
2.9 KiB
Objective-C

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