RCTInterpolationAnimatedNode.m
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/**
* 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 "RCTInterpolationAnimatedNode.h"
#import "RCTAnimationUtils.h"
@implementation RCTInterpolationAnimatedNode
{
__weak RCTValueAnimatedNode *_parentNode;
NSArray<NSNumber *> *_inputRange;
NSArray<NSNumber *> *_outputRange;
NSString *_extrapolateLeft;
NSString *_extrapolateRight;
}
- (instancetype)initWithTag:(NSNumber *)tag
config:(NSDictionary<NSString *, id> *)config
{
if ((self = [super initWithTag:tag config:config])) {
_inputRange = [config[@"inputRange"] copy];
NSMutableArray *outputRange = [NSMutableArray array];
for (id value in config[@"outputRange"]) {
if ([value isKindOfClass:[NSNumber class]]) {
[outputRange addObject:value];
}
}
_outputRange = [outputRange copy];
_extrapolateLeft = config[@"extrapolateLeft"];
_extrapolateRight = config[@"extrapolateRight"];
}
return self;
}
- (void)onAttachedToNode:(RCTAnimatedNode *)parent
{
[super onAttachedToNode:parent];
if ([parent isKindOfClass:[RCTValueAnimatedNode class]]) {
_parentNode = (RCTValueAnimatedNode *)parent;
}
}
- (void)onDetachedFromNode:(RCTAnimatedNode *)parent
{
[super onDetachedFromNode:parent];
if (_parentNode == parent) {
_parentNode = nil;
}
}
- (void)performUpdate
{
[super performUpdate];
if (!_parentNode) {
return;
}
CGFloat inputValue = _parentNode.value;
self.value = RCTInterpolateValueInRange(inputValue,
_inputRange,
_outputRange,
_extrapolateLeft,
_extrapolateRight);
}
@end