[NativeAnimated] Add support for DiffClamp node

Author: janicduplessis

Libraries/Animated/src/AnimatedImplementation.js

@@ -1223,6 +1223,11 @@ 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);
   }
@@ -1242,6 +1247,15 @@ 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 {

Libraries/NativeAnimation/Nodes/RCTDiffClampAnimatedNode.h

@@ -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

Libraries/NativeAnimation/Nodes/RCTDiffClampAnimatedNode.m

@@ -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

Libraries/NativeAnimation/RCTAnimation.xcodeproj/project.pbxproj

@@ -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 */,

Libraries/NativeAnimation/RCTNativeAnimatedModule.m

@@ -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]};

ReactAndroid/src/main/java/com/facebook/react/animated/DiffClampAnimatedNode.java

@@ -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;
+  }
+}

ReactAndroid/src/main/java/com/facebook/react/animated/NativeAnimatedNodesManager.java

@@ -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 {