89 lines
2.5 KiB
Objective-C
89 lines
2.5 KiB
Objective-C
/**
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* Copyright (c) 2015-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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#import "RCTInterpolationAnimatedNode.h"
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#import "RCTAnimationUtils.h"
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@implementation RCTInterpolationAnimatedNode
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{
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__weak RCTValueAnimatedNode *_parentNode;
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NSArray<NSNumber *> *_inputRange;
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NSArray<NSNumber *> *_outputRange;
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}
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- (instancetype)initWithTag:(NSNumber *)tag
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config:(NSDictionary<NSString *, id> *)config
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{
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if ((self = [super initWithTag:tag config:config])) {
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_inputRange = [config[@"inputRange"] copy];
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NSMutableArray *outputRange = [NSMutableArray array];
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for (id value in config[@"outputRange"]) {
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if ([value isKindOfClass:[NSNumber class]]) {
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[outputRange addObject:value];
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}
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}
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_outputRange = [outputRange copy];
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}
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return self;
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}
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- (void)onAttachedToNode:(RCTAnimatedNode *)parent
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{
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[super onAttachedToNode:parent];
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if ([parent isKindOfClass:[RCTValueAnimatedNode class]]) {
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_parentNode = (RCTValueAnimatedNode *)parent;
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}
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}
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- (void)onDetachedFromNode:(RCTAnimatedNode *)parent
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{
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[super onDetachedFromNode:parent];
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if (_parentNode == parent) {
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_parentNode = nil;
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}
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}
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- (NSUInteger)findIndexOfNearestValue:(CGFloat)value
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inRange:(NSArray<NSNumber *> *)range
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{
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NSUInteger index;
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NSUInteger rangeCount = range.count;
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for (index = 1; index < rangeCount - 1; index++) {
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NSNumber *inputValue = range[index];
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if (inputValue.doubleValue >= value) {
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break;
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}
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}
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return index - 1;
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}
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- (void)performUpdate
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{
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[super performUpdate];
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if (!_parentNode) {
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return;
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}
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NSUInteger rangeIndex = [self findIndexOfNearestValue:_parentNode.value
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inRange:_inputRange];
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NSNumber *inputMin = _inputRange[rangeIndex];
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NSNumber *inputMax = _inputRange[rangeIndex + 1];
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NSNumber *outputMin = _outputRange[rangeIndex];
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NSNumber *outputMax = _outputRange[rangeIndex + 1];
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CGFloat outputValue = RCTInterpolateValue(_parentNode.value,
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inputMin.doubleValue,
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inputMax.doubleValue,
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outputMin.doubleValue,
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outputMax.doubleValue);
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self.value = outputValue;
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}
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@end
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