/**
* 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).getValue();
}
}