63 lines
1.4 KiB
Mathematica
63 lines
1.4 KiB
Mathematica
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/**
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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 "RCTDiffClampAnimatedNode.h"
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#import "RCTLog.h"
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@implementation RCTDiffClampAnimatedNode
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{
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NSNumber *_inputNodeTag;
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CGFloat _min;
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CGFloat _max;
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CGFloat _lastValue;
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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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_inputNodeTag = config[@"input"];
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_min = [config[@"min"] floatValue];
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_max = [config[@"max"] floatValue];
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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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self.value = _lastValue = [self inputNodeValue];
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}
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- (void)performUpdate
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{
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[super performUpdate];
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CGFloat value = [self inputNodeValue];
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CGFloat diff = value - _lastValue;
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_lastValue = value;
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self.value = MIN(MAX(self.value + diff, _min), _max);
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}
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- (CGFloat)inputNodeValue
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{
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RCTValueAnimatedNode *inputNode = (RCTValueAnimatedNode *)self.parentNodes[_inputNodeTag];
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if (![inputNode isKindOfClass:[RCTValueAnimatedNode class]]) {
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RCTLogError(@"Illegal node ID set as an input for Animated.DiffClamp node");
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return 0;
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}
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return inputNode.value;
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}
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@end
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