react-native/ReactAndroid/src/main/java/com/facebook/react/animated/PropsAnimatedNode.java

/**
 * Copyright (c) 2015-present, Facebook, Inc.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */

package com.facebook.react.animated;

import com.facebook.react.bridge.JSApplicationIllegalArgumentException;
import com.facebook.react.bridge.JavaOnlyMap;
import com.facebook.react.bridge.ReadableMap;
import com.facebook.react.bridge.ReadableMapKeySetIterator;
import com.facebook.react.uimanager.ReactStylesDiffMap;
import com.facebook.react.uimanager.UIImplementation;

import java.util.HashMap;
import java.util.Map;

import javax.annotation.Nullable;

/**
 * Animated node that represents view properties. There is a special handling logic implemented for
 * the nodes of this type in {@link NativeAnimatedNodesManager} that is responsible for extracting
 * a map of updated properties, which can be then passed down to the view.
 */
/*package*/ class PropsAnimatedNode extends AnimatedNode {

  private int mConnectedViewTag = -1;
  private final NativeAnimatedNodesManager mNativeAnimatedNodesManager;
  private final UIImplementation mUIImplementation;
  private final Map<String, Integer> mPropNodeMapping;
  // This is the backing map for `mDiffMap` we can mutate this to update it instead of having to
  // create a new one for each update.
  private final JavaOnlyMap mPropMap;
  private final ReactStylesDiffMap mDiffMap;

  PropsAnimatedNode(ReadableMap config, NativeAnimatedNodesManager nativeAnimatedNodesManager, UIImplementation uiImplementation) {
    ReadableMap props = config.getMap("props");
    ReadableMapKeySetIterator iter = props.keySetIterator();
    mPropNodeMapping = new HashMap<>();
    while (iter.hasNextKey()) {
      String propKey = iter.nextKey();
      int nodeIndex = props.getInt(propKey);
      mPropNodeMapping.put(propKey, nodeIndex);
    }
    mPropMap = new JavaOnlyMap();
    mDiffMap = new ReactStylesDiffMap(mPropMap);
    mNativeAnimatedNodesManager = nativeAnimatedNodesManager;
    mUIImplementation = uiImplementation;
  }

  public void connectToView(int viewTag) {
    if (mConnectedViewTag != -1) {
      throw new JSApplicationIllegalArgumentException("Animated node " + mTag + " is " +
        "already attached to a view");
    }
    mConnectedViewTag = viewTag;
  }

  public void disconnectFromView(int viewTag) {
    if (mConnectedViewTag != viewTag) {
      throw new JSApplicationIllegalArgumentException("Attempting to disconnect view that has " +
        "not been connected with the given animated node");
    }

    mConnectedViewTag = -1;
  }

  public void restoreDefaultValues() {
    ReadableMapKeySetIterator it = mPropMap.keySetIterator();
    while(it.hasNextKey()) {
      mPropMap.putNull(it.nextKey());
    }

    mUIImplementation.synchronouslyUpdateViewOnUIThread(
      mConnectedViewTag,
      mDiffMap);
  }

  public final void updateView() {
    if (mConnectedViewTag == -1) {
      return;
    }
    for (Map.Entry<String, Integer> entry : mPropNodeMapping.entrySet()) {
      @Nullable AnimatedNode node = mNativeAnimatedNodesManager.getNodeById(entry.getValue());
      if (node == null) {
        throw new IllegalArgumentException("Mapped property node does not exists");
      } else if (node instanceof StyleAnimatedNode) {
        ((StyleAnimatedNode) node).collectViewUpdates(mPropMap);
      } else if (node instanceof ValueAnimatedNode) {
        mPropMap.putDouble(entry.getKey(), ((ValueAnimatedNode) node).getValue());
      } else {
        throw new IllegalArgumentException("Unsupported type of node used in property node " +
            node.getClass());
      }
    }

    mUIImplementation.synchronouslyUpdateViewOnUIThread(
      mConnectedViewTag,
      mDiffMap);
  }
}