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Add support for DiffClamp node

Summary:
Add native support on iOS and Android for `Animated.diffClamp` that was added in #9419.

**Test plan**
Tested that it works properly using the native animations UIExplorer example.
Closes #9691

Differential Revision: D3813440

fbshipit-source-id: 48a3ecddf3708fa44b408954d3d8133ec8537f21
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janicduplessis authored and Facebook Github Bot 9 committed Sep 6, 2016
1 parent 6d978c3 commit e26c13574665d4028cde536077927e01cea78034
@@ -1228,6 +1228,11 @@ class AnimatedDiffClamp extends AnimatedWithChildren {
this._value = this._lastValue = this._a.__getValue();
}

__makeNative() {
super.__makeNative();
this._a.__makeNative();
}

interpolate(config: InterpolationConfigType): AnimatedInterpolation {
return new AnimatedInterpolation(this, config);
}
@@ -1247,6 +1252,15 @@ class AnimatedDiffClamp extends AnimatedWithChildren {
__detach(): void {
this._a.__removeChild(this);
}

__getNativeConfig(): any {
return {
type: 'diffclamp',
input: this._a.__getNativeTag(),
min: this._min,
max: this._max,
};
}
}

class AnimatedTransform extends AnimatedWithChildren {
@@ -0,0 +1,14 @@
/**
* 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 "RCTValueAnimatedNode.h"

@interface RCTDiffClampAnimatedNode : RCTValueAnimatedNode

@end
@@ -0,0 +1,62 @@
/**
* 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 "RCTDiffClampAnimatedNode.h"
#import "RCTLog.h"

@implementation RCTDiffClampAnimatedNode
{
NSNumber *_inputNodeTag;
CGFloat _min;
CGFloat _max;
CGFloat _lastValue;
}

- (instancetype)initWithTag:(NSNumber *)tag
config:(NSDictionary<NSString *, id> *)config
{
if (self = [super initWithTag:tag config:config]) {
_inputNodeTag = config[@"input"];
_min = [config[@"min"] floatValue];
_max = [config[@"max"] floatValue];
}

return self;
}

- (void)onAttachedToNode:(RCTAnimatedNode *)parent
{
[super onAttachedToNode:parent];

self.value = _lastValue = [self inputNodeValue];
}

- (void)performUpdate
{
[super performUpdate];

CGFloat value = [self inputNodeValue];

CGFloat diff = value - _lastValue;
_lastValue = value;
self.value = MIN(MAX(self.value + diff, _min), _max);
}

- (CGFloat)inputNodeValue
{
RCTValueAnimatedNode *inputNode = (RCTValueAnimatedNode *)self.parentNodes[_inputNodeTag];
if (![inputNode isKindOfClass:[RCTValueAnimatedNode class]]) {
RCTLogError(@"Illegal node ID set as an input for Animated.DiffClamp node");
return 0;
}

return inputNode.value;
}

@end
@@ -20,6 +20,7 @@
13E501EF1D07A6C9005F35D8 /* RCTTransformAnimatedNode.m in Sources */ = {isa = PBXBuildFile; fileRef = 13E501E51D07A6C9005F35D8 /* RCTTransformAnimatedNode.m */; };
13E501F01D07A6C9005F35D8 /* RCTValueAnimatedNode.m in Sources */ = {isa = PBXBuildFile; fileRef = 13E501E71D07A6C9005F35D8 /* RCTValueAnimatedNode.m */; };
94DAE3F91D7334A70059942F /* RCTModuloAnimatedNode.m in Sources */ = {isa = PBXBuildFile; fileRef = 94DAE3F81D7334A70059942F /* RCTModuloAnimatedNode.m */; };
193F64F41D776EC6004D1CAA /* RCTDiffClampAnimatedNode.m in Sources */ = {isa = PBXBuildFile; fileRef = 193F64F31D776EC6004D1CAA /* RCTDiffClampAnimatedNode.m */; };
/* End PBXBuildFile section */

/* Begin PBXCopyFilesBuildPhase section */
@@ -62,6 +63,8 @@
13E501E71D07A6C9005F35D8 /* RCTValueAnimatedNode.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = RCTValueAnimatedNode.m; sourceTree = "<group>"; };
94DAE3F71D7334A70059942F /* RCTModuloAnimatedNode.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = RCTModuloAnimatedNode.h; sourceTree = "<group>"; };
94DAE3F81D7334A70059942F /* RCTModuloAnimatedNode.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = RCTModuloAnimatedNode.m; sourceTree = "<group>"; };
193F64F21D776EC6004D1CAA /* RCTDiffClampAnimatedNode.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = RCTDiffClampAnimatedNode.h; sourceTree = "<group>"; };
193F64F31D776EC6004D1CAA /* RCTDiffClampAnimatedNode.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = RCTDiffClampAnimatedNode.m; sourceTree = "<group>"; };
/* End PBXFileReference section */

/* Begin PBXFrameworksBuildPhase section */
@@ -86,6 +89,8 @@
13E501D51D07A6C9005F35D8 /* Nodes */ = {
isa = PBXGroup;
children = (
193F64F21D776EC6004D1CAA /* RCTDiffClampAnimatedNode.h */,
193F64F31D776EC6004D1CAA /* RCTDiffClampAnimatedNode.m */,
13E501D61D07A6C9005F35D8 /* RCTAdditionAnimatedNode.h */,
13E501D71D07A6C9005F35D8 /* RCTAdditionAnimatedNode.m */,
13E501D81D07A6C9005F35D8 /* RCTAnimatedNode.h */,
@@ -182,6 +187,7 @@
files = (
13E501F01D07A6C9005F35D8 /* RCTValueAnimatedNode.m in Sources */,
94DAE3F91D7334A70059942F /* RCTModuloAnimatedNode.m in Sources */,
193F64F41D776EC6004D1CAA /* RCTDiffClampAnimatedNode.m in Sources */,
13E501EE1D07A6C9005F35D8 /* RCTStyleAnimatedNode.m in Sources */,
13E501CC1D07A644005F35D8 /* RCTAnimationUtils.m in Sources */,
13E501CF1D07A644005F35D8 /* RCTNativeAnimatedModule.m in Sources */,
@@ -15,6 +15,7 @@
#import "RCTConvert.h"
#import "RCTInterpolationAnimatedNode.h"
#import "RCTLog.h"
#import "RCTDiffClampAnimatedNode.h"
#import "RCTModuloAnimatedNode.h"
#import "RCTMultiplicationAnimatedNode.h"
#import "RCTPropsAnimatedNode.h"
@@ -69,6 +70,7 @@ - (dispatch_queue_t)methodQueue
@"props" : [RCTPropsAnimatedNode class],
@"interpolation" : [RCTInterpolationAnimatedNode class],
@"addition" : [RCTAdditionAnimatedNode class],
@"diffclamp": [RCTDiffClampAnimatedNode class],
@"multiplication" : [RCTMultiplicationAnimatedNode class],
@"modulus" : [RCTModuloAnimatedNode class],
@"transform" : [RCTTransformAnimatedNode class]};
@@ -0,0 +1,53 @@
/**
* 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.
*/

package com.facebook.react.animated;

import com.facebook.react.bridge.JSApplicationCausedNativeException;
import com.facebook.react.bridge.ReadableMap;

/*package*/ class DiffClampAnimatedNode extends ValueAnimatedNode {
private final NativeAnimatedNodesManager mNativeAnimatedNodesManager;
private final int mInputNodeTag;
private final double mMin;
private final double mMax;

private double mLastValue;

public DiffClampAnimatedNode(
ReadableMap config,
NativeAnimatedNodesManager nativeAnimatedNodesManager) {
mNativeAnimatedNodesManager = nativeAnimatedNodesManager;
mInputNodeTag = config.getInt("input");
mMin = config.getDouble("min");
mMax = config.getDouble("max");

mValue = mLastValue = getInputNodeValue();
}

@Override
public void update() {
double value = getInputNodeValue();

double diff = value - mLastValue;
mLastValue = value;
mValue = Math.min(Math.max(mValue + diff, mMin), mMax);
}

private double getInputNodeValue() {
AnimatedNode animatedNode = mNativeAnimatedNodesManager.getNodeById(mInputNodeTag);
if (animatedNode == null || !(animatedNode instanceof ValueAnimatedNode)) {
throw new JSApplicationCausedNativeException("Illegal node ID set as an input for " +
"Animated.DiffClamp node");

}

return ((ValueAnimatedNode) animatedNode).mValue;
}
}
@@ -78,6 +78,8 @@ public void createAnimatedNode(int tag, ReadableMap config) {
node = new AdditionAnimatedNode(config, this);
} else if ("multiplication".equals(type)) {
node = new MultiplicationAnimatedNode(config, this);
} else if ("diffclamp".equals(type)) {
node = new DiffClampAnimatedNode(config, this);
} else if ("transform".equals(type)) {
node = new TransformAnimatedNode(config, this);
} else {

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