Implement Cloning for ART Views

Reviewed By: achen1

Differential Revision: D7058410

fbshipit-source-id: 394330654be1ab70853f78580c2543e04a3efb7c

ReactAndroid/src/main/java/com/facebook/react/common/ArrayUtils.java

@@ -0,0 +1,11 @@
+package com.facebook.react.common;
+
+import java.util.Arrays;
+
+public class ArrayUtils {
+
+  public static float[] copyArray(float[] array) {
+    return array == null ? null : Arrays.copyOf(array, array.length);
+  }
+
+}

ReactAndroid/src/main/java/com/facebook/react/uimanager/ReactShadowNodeImpl.java

@@ -123,6 +123,7 @@ public ReactShadowNodeImpl(ReactShadowNodeImpl original) {
     }
   }
 
+  @Override
   public ReactShadowNodeImpl mutableCopy() {
     return new ReactShadowNodeImpl(this);
   }

ReactAndroid/src/main/java/com/facebook/react/views/art/ARTGroupShadowNode.java

@@ -7,6 +7,7 @@
 
 package com.facebook.react.views.art;
 
+import com.facebook.react.uimanager.ReactShadowNodeImpl;
 import javax.annotation.Nullable;
 
 import android.graphics.Canvas;
@@ -25,6 +26,13 @@ public class ARTGroupShadowNode extends ARTVirtualNode {
 
   protected @Nullable RectF mClipping;
 
+  public ARTGroupShadowNode() { }
+
+  public ARTGroupShadowNode(ARTGroupShadowNode node) {
+    super(node);
+    this.mClipping = new RectF(node.mClipping);
+  }
+
   @ReactProp(name = "clipping")
   public void setClipping(@Nullable ReadableArray clippingDims) {
     float[] clippingData = PropHelper.toFloatArray(clippingDims);
@@ -34,6 +42,11 @@ public void setClipping(@Nullable ReadableArray clippingDims) {
     }
   }
 
+  @Override
+  public ReactShadowNodeImpl mutableCopy() {
+    return new ARTGroupShadowNode(this);
+  }
+
   @Override
   public boolean isVirtual() {
     return true;

ReactAndroid/src/main/java/com/facebook/react/views/art/ARTShapeShadowNode.java

@@ -7,22 +7,22 @@
 
 package com.facebook.react.views.art;
 
-import javax.annotation.Nullable;
-
 import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.DashPathEffect;
+import android.graphics.LinearGradient;
 import android.graphics.Paint;
 import android.graphics.Path;
 import android.graphics.RectF;
-import android.graphics.DashPathEffect;
-import android.graphics.LinearGradient;
 import android.graphics.Shader;
-import android.graphics.Color;
-
 import com.facebook.common.logging.FLog;
 import com.facebook.react.bridge.JSApplicationIllegalArgumentException;
 import com.facebook.react.bridge.ReadableArray;
 import com.facebook.react.common.ReactConstants;
 import com.facebook.react.uimanager.annotations.ReactProp;
+import javax.annotation.Nullable;
+
+import static com.facebook.react.common.ArrayUtils.copyArray;
 
 /**
  * Shadow node for virtual ARTShape view
@@ -58,6 +58,24 @@ public class ARTShapeShadowNode extends ARTVirtualNode {
   private int mStrokeCap = CAP_ROUND;
   private int mStrokeJoin = JOIN_ROUND;
 
+  public ARTShapeShadowNode() { }
+
+  public ARTShapeShadowNode(ARTShapeShadowNode node) {
+    super(node);
+    mPath = new Path(node.mPath);
+    mStrokeColor = copyArray(node.mStrokeColor);
+    mBrushData = copyArray(node.mBrushData);
+    mStrokeDash = copyArray(node.mStrokeDash);
+    mStrokeWidth = node.mStrokeWidth;
+    mStrokeCap = node.mStrokeCap;
+    mStrokeJoin = node.mStrokeJoin;
+  }
+
+  @Override
+  public ARTShapeShadowNode mutableCopy() {
+    return new ARTShapeShadowNode(this);
+  }
+
   @ReactProp(name = "d")
   public void setShapePath(@Nullable ReadableArray shapePath) {
     float[] pathData = PropHelper.toFloatArray(shapePath);

ReactAndroid/src/main/java/com/facebook/react/views/art/ARTTextShadowNode.java

@@ -40,6 +40,19 @@ public class ARTTextShadowNode extends ARTShapeShadowNode {
   private @Nullable ReadableMap mFrame;
   private int mTextAlignment = TEXT_ALIGNMENT_LEFT;
 
+  public ARTTextShadowNode() { }
+
+  public ARTTextShadowNode(ARTTextShadowNode node) {
+    super(node);
+    mTextAlignment = node.mTextAlignment;
+    mFrame = node.mFrame; // copy reference as mFrame is already immutable
+  }
+
+  @Override
+  public ARTShapeShadowNode mutableCopy() {
+    return new ARTTextShadowNode(this);
+  }
+
   @ReactProp(name = "frame")
   public void setFrame(@Nullable ReadableMap frame) {
     mFrame = frame;

ReactAndroid/src/main/java/com/facebook/react/views/art/ARTVirtualNode.java

@@ -37,6 +37,13 @@ public ARTVirtualNode() {
     mScale = DisplayMetricsHolder.getWindowDisplayMetrics().density;
   }
 
+  protected ARTVirtualNode(ARTVirtualNode artVirtualNode) {
+    super(artVirtualNode);
+    mScale = artVirtualNode.mScale;
+    mOpacity = artVirtualNode.mOpacity;
+    mMatrix = new Matrix(artVirtualNode.mMatrix);
+  }
+
   @Override
   public boolean isVirtual() {
     return true;