/**
* 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.infer.annotation.Assertions;
import java.util.ArrayList;
import java.util.List;
import javax.annotation.Nullable;
/**
* Base class for all Animated.js library node types that can be created on the "native" side.
*/
/*package*/ abstract class AnimatedNode {
public static final int INITIAL_BFS_COLOR = 0;
private static final int DEFAULT_ANIMATED_NODE_CHILD_COUNT = 1;
/*package*/ @Nullable List<AnimatedNode> mChildren; /* lazy-initialized when a child is added */
/*package*/ int mActiveIncomingNodes = 0;
/*package*/ int mBFSColor = INITIAL_BFS_COLOR;
/*package*/ int mTag = -1;
public final void addChild(AnimatedNode child) {
if (mChildren == null) {
mChildren = new ArrayList<>(DEFAULT_ANIMATED_NODE_CHILD_COUNT);
}
Assertions.assertNotNull(mChildren).add(child);
child.onAttachedToNode(this);
}
public final void removeChild(AnimatedNode child) {
if (mChildren == null) {
return;
}
child.onDetachedFromNode(this);
mChildren.remove(child);
}
/**
* Subclasses may want to override this method in order to store a reference to the parent of a
* given node that can then be used to calculate current node's value in {@link #update}.
* In that case it is important to also override {@link #onDetachedFromNode} to clear that
* reference once current node gets detached.
*/
public void onAttachedToNode(AnimatedNode parent) {
}
/**
* See {@link #onAttachedToNode}
*/
public void onDetachedFromNode(AnimatedNode parent) {
}
/**
* This method will be run on each node at most once every repetition of the animation loop. It
* will be executed on a node only when all the node's parent has already been updated. Therefore
* it can be used to calculate node's value.
*/
public void update() {
}
}