yoga/java/com/facebook/yoga/YogaNode.java

/*
 * Copyright (c) 2014-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.yoga;

import javax.annotation.Nullable;

import java.util.List;
import java.util.ArrayList;

import com.facebook.proguard.annotations.DoNotStrip;
import com.facebook.soloader.SoLoader;

@DoNotStrip
public class YogaNode {

  static {
    SoLoader.loadLibrary("yoga");
  }

  /**
   * Get native instance count. Useful for testing only.
   */
  static native int jni_YGNodeGetInstanceCount();

  private YogaNode mParent;
  private List<YogaNode> mChildren;
  private YogaMeasureFunction mMeasureFunction;
  private YogaBaselineFunction mBaselineFunction;
  private final long mNativePointer;
  private Object mData;

  /* Those flags needs be in sync with YGJNI.cpp */
  private static final int MARGIN = 1;
  private static final int PADDING = 2;
  private static final int BORDER = 4;

  @DoNotStrip
  private int mEdgeSetFlag = 0;

  private boolean mHasSetPosition = false;

  @DoNotStrip
  private float mWidth = YogaConstants.UNDEFINED;
  @DoNotStrip
  private float mHeight = YogaConstants.UNDEFINED;
  @DoNotStrip
  private float mTop = YogaConstants.UNDEFINED;
  @DoNotStrip
  private float mLeft = YogaConstants.UNDEFINED;
  @DoNotStrip
  private float mMarginLeft = 0;
  @DoNotStrip
  private float mMarginTop = 0;
  @DoNotStrip
  private float mMarginRight = 0;
  @DoNotStrip
  private float mMarginBottom = 0;
  @DoNotStrip
  private float mPaddingLeft = 0;
  @DoNotStrip
  private float mPaddingTop = 0;
  @DoNotStrip
  private float mPaddingRight = 0;
  @DoNotStrip
  private float mPaddingBottom = 0;
  @DoNotStrip
  private float mBorderLeft = 0;
  @DoNotStrip
  private float mBorderTop = 0;
  @DoNotStrip
  private float mBorderRight = 0;
  @DoNotStrip
  private float mBorderBottom = 0;
  @DoNotStrip
  private int mLayoutDirection = 0;
  @DoNotStrip
  private boolean mHasNewLayout = true;

  private native long jni_YGNodeNew();
  public YogaNode() {
    mNativePointer = jni_YGNodeNew();
    if (mNativePointer == 0) {
      throw new IllegalStateException("Failed to allocate native memory");
    }
  }

  private native long jni_YGNodeNewWithConfig(long configPointer);
  public YogaNode(YogaConfig config) {
    mNativePointer = jni_YGNodeNewWithConfig(config.mNativePointer);
    if (mNativePointer == 0) {
      throw new IllegalStateException("Failed to allocate native memory");
    }
  }

  private native void jni_YGNodeFree(long nativePointer);
  @Override
  protected void finalize() throws Throwable {
    try {
      jni_YGNodeFree(mNativePointer);
    } finally {
      super.finalize();
    }
  }

  private native void jni_YGNodeReset(long nativePointer);
  public void reset() {
    mEdgeSetFlag = 0;
    mHasSetPosition = false;
    mHasNewLayout = true;

    mWidth = YogaConstants.UNDEFINED;
    mHeight = YogaConstants.UNDEFINED;
    mTop = YogaConstants.UNDEFINED;
    mLeft = YogaConstants.UNDEFINED;
    mMarginLeft = 0;
    mMarginTop = 0;
    mMarginRight = 0;
    mMarginBottom = 0;
    mPaddingLeft = 0;
    mPaddingTop = 0;
    mPaddingRight = 0;
    mPaddingBottom = 0;
    mBorderLeft = 0;
    mBorderTop = 0;
    mBorderRight = 0;
    mBorderBottom = 0;
    mLayoutDirection = 0;

    mMeasureFunction = null;
    mBaselineFunction = null;
    mData = null;

    jni_YGNodeReset(mNativePointer);
  }

  public int getChildCount() {
    return mChildren == null ? 0 : mChildren.size();
  }

  public YogaNode getChildAt(int i) {
    return mChildren.get(i);
  }

  private native void jni_YGNodeInsertChild(long nativePointer, long childPointer, int index);
  public void addChildAt(YogaNode child, int i) {
    if (child.mParent != null) {
      throw new IllegalStateException("Child already has a parent, it must be removed first.");
    }

    if (mChildren == null) {
      mChildren = new ArrayList<>(4);
    }
    mChildren.add(i, child);
    child.mParent = this;
    jni_YGNodeInsertChild(mNativePointer, child.mNativePointer, i);
  }

  private native void jni_YGNodeRemoveChild(long nativePointer, long childPointer);
  public YogaNode removeChildAt(int i) {

    final YogaNode child = mChildren.remove(i);
    child.mParent = null;
    jni_YGNodeRemoveChild(mNativePointer, child.mNativePointer);
    return child;
  }

  @Nullable
  public
  YogaNode getParent() {
    return mParent;
  }

  public int indexOf(YogaNode child) {
    return mChildren == null ? -1 : mChildren.indexOf(child);
  }

  private native void jni_YGNodeCalculateLayout(long nativePointer, float width, float height);
  public void calculateLayout(float width, float height) {
    jni_YGNodeCalculateLayout(mNativePointer, width, height);
  }

  public boolean hasNewLayout() {
    return mHasNewLayout;
  }

  private native void jni_YGNodeMarkDirty(long nativePointer);
  public void dirty() {
    jni_YGNodeMarkDirty(mNativePointer);
  }

  private native boolean jni_YGNodeIsDirty(long nativePointer);
  public boolean isDirty() {
    return jni_YGNodeIsDirty(mNativePointer);
  }

  private native void jni_YGNodeCopyStyle(long dstNativePointer, long srcNativePointer);
  public void copyStyle(YogaNode srcNode) {
    jni_YGNodeCopyStyle(mNativePointer, srcNode.mNativePointer);
  }

  public void markLayoutSeen() {
    mHasNewLayout = false;
  }

  private native int jni_YGNodeStyleGetDirection(long nativePointer);
  public YogaDirection getStyleDirection() {
    return YogaDirection.fromInt(jni_YGNodeStyleGetDirection(mNativePointer));
  }

  private native void jni_YGNodeStyleSetDirection(long nativePointer, int direction);
  public void setDirection(YogaDirection direction) {
    jni_YGNodeStyleSetDirection(mNativePointer, direction.intValue());
  }

  private native int jni_YGNodeStyleGetFlexDirection(long nativePointer);
  public YogaFlexDirection getFlexDirection() {
    return YogaFlexDirection.fromInt(jni_YGNodeStyleGetFlexDirection(mNativePointer));
  }

  private native void jni_YGNodeStyleSetFlexDirection(long nativePointer, int flexDirection);
  public void setFlexDirection(YogaFlexDirection flexDirection) {
    jni_YGNodeStyleSetFlexDirection(mNativePointer, flexDirection.intValue());
  }

  private native int jni_YGNodeStyleGetJustifyContent(long nativePointer);
  public YogaJustify getJustifyContent() {
    return YogaJustify.fromInt(jni_YGNodeStyleGetJustifyContent(mNativePointer));
  }

  private native void jni_YGNodeStyleSetJustifyContent(long nativePointer, int justifyContent);
  public void setJustifyContent(YogaJustify justifyContent) {
    jni_YGNodeStyleSetJustifyContent(mNativePointer, justifyContent.intValue());
  }

  private native int jni_YGNodeStyleGetAlignItems(long nativePointer);
  public YogaAlign getAlignItems() {
    return YogaAlign.fromInt(jni_YGNodeStyleGetAlignItems(mNativePointer));
  }

  private native void jni_YGNodeStyleSetAlignItems(long nativePointer, int alignItems);
  public void setAlignItems(YogaAlign alignItems) {
    jni_YGNodeStyleSetAlignItems(mNativePointer, alignItems.intValue());
  }

  private native int jni_YGNodeStyleGetAlignSelf(long nativePointer);
  public YogaAlign getAlignSelf() {
    return YogaAlign.fromInt(jni_YGNodeStyleGetAlignSelf(mNativePointer));
  }

  private native void jni_YGNodeStyleSetAlignSelf(long nativePointer, int alignSelf);
  public void setAlignSelf(YogaAlign alignSelf) {
    jni_YGNodeStyleSetAlignSelf(mNativePointer, alignSelf.intValue());
  }

  private native int jni_YGNodeStyleGetAlignContent(long nativePointer);
  public YogaAlign getAlignContent() {
    return YogaAlign.fromInt(jni_YGNodeStyleGetAlignContent(mNativePointer));
  }

  private native void jni_YGNodeStyleSetAlignContent(long nativePointer, int alignContent);
  public void setAlignContent(YogaAlign alignContent) {
    jni_YGNodeStyleSetAlignContent(mNativePointer, alignContent.intValue());
  }

  private native int jni_YGNodeStyleGetPositionType(long nativePointer);
  public YogaPositionType getPositionType() {
    return YogaPositionType.fromInt(jni_YGNodeStyleGetPositionType(mNativePointer));
  }

  private native void jni_YGNodeStyleSetPositionType(long nativePointer, int positionType);
  public void setPositionType(YogaPositionType positionType) {
    jni_YGNodeStyleSetPositionType(mNativePointer, positionType.intValue());
  }

  private native void jni_YGNodeStyleSetFlexWrap(long nativePointer, int wrapType);
  public void setWrap(YogaWrap flexWrap) {
    jni_YGNodeStyleSetFlexWrap(mNativePointer, flexWrap.intValue());
  }

  private native int jni_YGNodeStyleGetOverflow(long nativePointer);
  public YogaOverflow getOverflow() {
    return YogaOverflow.fromInt(jni_YGNodeStyleGetOverflow(mNativePointer));
  }

  private native void jni_YGNodeStyleSetOverflow(long nativePointer, int overflow);
  public void setOverflow(YogaOverflow overflow) {
    jni_YGNodeStyleSetOverflow(mNativePointer, overflow.intValue());
  }

  private native int jni_YGNodeStyleGetDisplay(long nativePointer);
  public YogaDisplay getDisplay() {
    return YogaDisplay.fromInt(jni_YGNodeStyleGetDisplay(mNativePointer));
  }

  private native void jni_YGNodeStyleSetDisplay(long nativePointer, int display);
  public void setDisplay(YogaDisplay display) {
    jni_YGNodeStyleSetDisplay(mNativePointer, display.intValue());
  }

  private native void jni_YGNodeStyleSetFlex(long nativePointer, float flex);
  public void setFlex(float flex) {
    jni_YGNodeStyleSetFlex(mNativePointer, flex);
  }

  private native float jni_YGNodeStyleGetFlexGrow(long nativePointer);
  public float getFlexGrow() {
    return jni_YGNodeStyleGetFlexGrow(mNativePointer);
  }

  private native void jni_YGNodeStyleSetFlexGrow(long nativePointer, float flexGrow);
  public void setFlexGrow(float flexGrow) {
    jni_YGNodeStyleSetFlexGrow(mNativePointer, flexGrow);
  }

  private native float jni_YGNodeStyleGetFlexShrink(long nativePointer);
  public float getFlexShrink() {
    return jni_YGNodeStyleGetFlexShrink(mNativePointer);
  }

  private native void jni_YGNodeStyleSetFlexShrink(long nativePointer, float flexShrink);
  public void setFlexShrink(float flexShrink) {
    jni_YGNodeStyleSetFlexShrink(mNativePointer, flexShrink);
  }

  private native Object jni_YGNodeStyleGetFlexBasis(long nativePointer);
  public YogaValue getFlexBasis() {
    return (YogaValue) jni_YGNodeStyleGetFlexBasis(mNativePointer);
  }

  private native void jni_YGNodeStyleSetFlexBasis(long nativePointer, float flexBasis);
  public void setFlexBasis(float flexBasis) {
    jni_YGNodeStyleSetFlexBasis(mNativePointer, flexBasis);
  }

  private native void jni_YGNodeStyleSetFlexBasisPercent(long nativePointer, float percent);
  public void setFlexBasisPercent(float percent) {
    jni_YGNodeStyleSetFlexBasisPercent(mNativePointer, percent);
  }

  private native void jni_YGNodeStyleSetFlexBasisAuto(long nativePointer);
  public void setFlexBasisAuto() {
    jni_YGNodeStyleSetFlexBasisAuto(mNativePointer);
  }

  private native Object jni_YGNodeStyleGetMargin(long nativePointer, int edge);
  public YogaValue getMargin(YogaEdge edge) {
    if (!((mEdgeSetFlag & MARGIN) == MARGIN)) {
      return YogaValue.UNDEFINED;
    }
    return (YogaValue) jni_YGNodeStyleGetMargin(mNativePointer, edge.intValue());
  }

  private native void jni_YGNodeStyleSetMargin(long nativePointer, int edge, float margin);
  public void setMargin(YogaEdge edge, float margin) {
    mEdgeSetFlag |= MARGIN;
    jni_YGNodeStyleSetMargin(mNativePointer, edge.intValue(), margin);
  }

  private native void jni_YGNodeStyleSetMarginPercent(long nativePointer, int edge, float percent);
  public void setMarginPercent(YogaEdge edge, float percent) {
    mEdgeSetFlag |= MARGIN;
    jni_YGNodeStyleSetMarginPercent(mNativePointer, edge.intValue(), percent);
  }

  private native void jni_YGNodeStyleSetMarginAuto(long nativePointer, int edge);
  public void setMarginAuto(YogaEdge edge) {
    mEdgeSetFlag |= MARGIN;
    jni_YGNodeStyleSetMarginAuto(mNativePointer, edge.intValue());
  }

  private native Object jni_YGNodeStyleGetPadding(long nativePointer, int edge);
  public YogaValue getPadding(YogaEdge edge) {
    if (!((mEdgeSetFlag & PADDING) == PADDING)) {
      return YogaValue.UNDEFINED;
    }
    return (YogaValue) jni_YGNodeStyleGetPadding(mNativePointer, edge.intValue());
  }

  private native void jni_YGNodeStyleSetPadding(long nativePointer, int edge, float padding);
  public void setPadding(YogaEdge edge, float padding) {
    mEdgeSetFlag |= PADDING;
    jni_YGNodeStyleSetPadding(mNativePointer, edge.intValue(), padding);
  }

  private native void jni_YGNodeStyleSetPaddingPercent(long nativePointer, int edge, float percent);
  public void setPaddingPercent(YogaEdge edge, float percent) {
    mEdgeSetFlag |= PADDING;
    jni_YGNodeStyleSetPaddingPercent(mNativePointer, edge.intValue(), percent);
  }

  private native float jni_YGNodeStyleGetBorder(long nativePointer, int edge);
  public float getBorder(YogaEdge edge) {
    if (!((mEdgeSetFlag & BORDER) == BORDER)) {
      return YogaConstants.UNDEFINED;
    }
    return jni_YGNodeStyleGetBorder(mNativePointer, edge.intValue());
  }

  private native void jni_YGNodeStyleSetBorder(long nativePointer, int edge, float border);
  public void setBorder(YogaEdge edge, float border) {
    mEdgeSetFlag |= BORDER;
    jni_YGNodeStyleSetBorder(mNativePointer, edge.intValue(), border);
  }

  private native Object jni_YGNodeStyleGetPosition(long nativePointer, int edge);
  public YogaValue getPosition(YogaEdge edge) {
    if (!mHasSetPosition) {
      return YogaValue.UNDEFINED;
    }
    return (YogaValue) jni_YGNodeStyleGetPosition(mNativePointer, edge.intValue());
  }

  private native void jni_YGNodeStyleSetPosition(long nativePointer, int edge, float position);
  public void setPosition(YogaEdge edge, float position) {
    mHasSetPosition = true;
    jni_YGNodeStyleSetPosition(mNativePointer, edge.intValue(), position);
  }

  private native void jni_YGNodeStyleSetPositionPercent(long nativePointer, int edge, float percent);
  public void setPositionPercent(YogaEdge edge, float percent) {
    mHasSetPosition = true;
    jni_YGNodeStyleSetPositionPercent(mNativePointer, edge.intValue(), percent);
  }

  private native Object jni_YGNodeStyleGetWidth(long nativePointer);
  public YogaValue getWidth() {
    return (YogaValue) jni_YGNodeStyleGetWidth(mNativePointer);
  }

  private native void jni_YGNodeStyleSetWidth(long nativePointer, float width);
  public void setWidth(float width) {
    jni_YGNodeStyleSetWidth(mNativePointer, width);
  }

  private native void jni_YGNodeStyleSetWidthPercent(long nativePointer, float percent);
  public void setWidthPercent(float percent) {
    jni_YGNodeStyleSetWidthPercent(mNativePointer, percent);
  }

  private native void jni_YGNodeStyleSetWidthAuto(long nativePointer);
  public void setWidthAuto() {
    jni_YGNodeStyleSetWidthAuto(mNativePointer);
  }

  private native Object jni_YGNodeStyleGetHeight(long nativePointer);
  public YogaValue getHeight() {
    return (YogaValue) jni_YGNodeStyleGetHeight(mNativePointer);
  }

  private native void jni_YGNodeStyleSetHeight(long nativePointer, float height);
  public void setHeight(float height) {
    jni_YGNodeStyleSetHeight(mNativePointer, height);
  }

  private native void jni_YGNodeStyleSetHeightPercent(long nativePointer, float percent);
  public void setHeightPercent(float percent) {
    jni_YGNodeStyleSetHeightPercent(mNativePointer, percent);
  }

  private native void jni_YGNodeStyleSetHeightAuto(long nativePointer);
  public void setHeightAuto() {
    jni_YGNodeStyleSetHeightAuto(mNativePointer);
  }

  private native Object jni_YGNodeStyleGetMinWidth(long nativePointer);
  public YogaValue getMinWidth() {
    return (YogaValue) jni_YGNodeStyleGetMinWidth(mNativePointer);
  }

  private native void jni_YGNodeStyleSetMinWidth(long nativePointer, float minWidth);
  public void setMinWidth(float minWidth) {
    jni_YGNodeStyleSetMinWidth(mNativePointer, minWidth);
  }

  private native void jni_YGNodeStyleSetMinWidthPercent(long nativePointer, float percent);
  public void setMinWidthPercent(float percent) {
    jni_YGNodeStyleSetMinWidthPercent(mNativePointer, percent);
  }

  private native Object jni_YGNodeStyleGetMinHeight(long nativePointer);
  public YogaValue getMinHeight() {
    return (YogaValue) jni_YGNodeStyleGetMinHeight(mNativePointer);
  }

  private native void jni_YGNodeStyleSetMinHeight(long nativePointer, float minHeight);
  public void setMinHeight(float minHeight) {
    jni_YGNodeStyleSetMinHeight(mNativePointer, minHeight);
  }

  private native void jni_YGNodeStyleSetMinHeightPercent(long nativePointer, float percent);
  public void setMinHeightPercent(float percent) {
    jni_YGNodeStyleSetMinHeightPercent(mNativePointer, percent);
  }

  private native Object jni_YGNodeStyleGetMaxWidth(long nativePointer);
  public YogaValue getMaxWidth() {
    return (YogaValue) jni_YGNodeStyleGetMaxWidth(mNativePointer);
  }

  private native void jni_YGNodeStyleSetMaxWidth(long nativePointer, float maxWidth);
  public void setMaxWidth(float maxWidth) {
    jni_YGNodeStyleSetMaxWidth(mNativePointer, maxWidth);
  }

  private native void jni_YGNodeStyleSetMaxWidthPercent(long nativePointer, float percent);
  public void setMaxWidthPercent(float percent) {
    jni_YGNodeStyleSetMaxWidthPercent(mNativePointer, percent);
  }

  private native Object jni_YGNodeStyleGetMaxHeight(long nativePointer);
  public YogaValue getMaxHeight() {
    return (YogaValue) jni_YGNodeStyleGetMaxHeight(mNativePointer);
  }

  private native void jni_YGNodeStyleSetMaxHeight(long nativePointer, float maxheight);
  public void setMaxHeight(float maxheight) {
    jni_YGNodeStyleSetMaxHeight(mNativePointer, maxheight);
  }

  private native void jni_YGNodeStyleSetMaxHeightPercent(long nativePointer, float percent);
  public void setMaxHeightPercent(float percent) {
    jni_YGNodeStyleSetMaxHeightPercent(mNativePointer, percent);
  }

  private native float jni_YGNodeStyleGetAspectRatio(long nativePointer);
  public float getAspectRatio() {
    return jni_YGNodeStyleGetAspectRatio(mNativePointer);
  }

  private native void jni_YGNodeStyleSetAspectRatio(long nativePointer, float aspectRatio);
  public void setAspectRatio(float aspectRatio) {
    jni_YGNodeStyleSetAspectRatio(mNativePointer, aspectRatio);
  }

  public float getLayoutX() {
    return mLeft;
  }

  public float getLayoutY() {
    return mTop;
  }

  public float getLayoutWidth() {
    return mWidth;
  }

  public float getLayoutHeight() {
    return mHeight;
  }

  public float getLayoutMargin(YogaEdge edge) {
    switch (edge) {
      case LEFT:
        return mMarginLeft;
      case TOP:
        return mMarginTop;
      case RIGHT:
        return mMarginRight;
      case BOTTOM:
        return mMarginBottom;
      case START:
        return getLayoutDirection() == YogaDirection.RTL ? mMarginRight : mMarginLeft;
      case END:
        return getLayoutDirection() == YogaDirection.RTL ? mMarginLeft : mMarginRight;
      default:
        throw new IllegalArgumentException("Cannot get layout margins of multi-edge shorthands");
    }
  }

  public float getLayoutPadding(YogaEdge edge) {
    switch (edge) {
      case LEFT:
        return mPaddingLeft;
      case TOP:
        return mPaddingTop;
      case RIGHT:
        return mPaddingRight;
      case BOTTOM:
        return mPaddingBottom;
      case START:
        return getLayoutDirection() == YogaDirection.RTL ? mPaddingRight : mPaddingLeft;
      case END:
        return getLayoutDirection() == YogaDirection.RTL ? mPaddingLeft : mPaddingRight;
      default:
        throw new IllegalArgumentException("Cannot get layout paddings of multi-edge shorthands");
    }
  }

  public float getLayoutBorder(YogaEdge edge) {
    switch (edge) {
      case LEFT:
        return mBorderLeft;
      case TOP:
        return mBorderTop;
      case RIGHT:
        return mBorderRight;
      case BOTTOM:
        return mBorderBottom;
      case START:
        return getLayoutDirection() == YogaDirection.RTL ? mBorderRight : mBorderLeft;
      case END:
        return getLayoutDirection() == YogaDirection.RTL ? mBorderLeft : mBorderRight;
      default:
        throw new IllegalArgumentException("Cannot get layout border of multi-edge shorthands");
    }
  }

  public YogaDirection getLayoutDirection() {
    return YogaDirection.fromInt(mLayoutDirection);
  }

  private native void jni_YGNodeSetHasMeasureFunc(long nativePointer, boolean hasMeasureFunc);
  public void setMeasureFunction(YogaMeasureFunction measureFunction) {
    mMeasureFunction = measureFunction;
    jni_YGNodeSetHasMeasureFunc(mNativePointer, measureFunction != null);
  }

  // Implementation Note: Why this method needs to stay final
  //
  // We cache the jmethodid for this method in Yoga code. This means that even if a subclass
  // were to override measure, we'd still call this implementation from layout code since the
  // overriding method will have a different jmethodid. This is final to prevent that mistake.
  @DoNotStrip
  public final long measure(float width, int widthMode, float height, int heightMode) {
    if (!isMeasureDefined()) {
      throw new RuntimeException("Measure function isn't defined!");
    }

    return mMeasureFunction.measure(
          this,
          width,
          YogaMeasureMode.fromInt(widthMode),
          height,
          YogaMeasureMode.fromInt(heightMode));
  }

  private native void jni_YGNodeSetHasBaselineFunc(long nativePointer, boolean hasMeasureFunc);
  public void setBaselineFunction(YogaBaselineFunction baselineFunction) {
    mBaselineFunction = baselineFunction;
    jni_YGNodeSetHasBaselineFunc(mNativePointer, baselineFunction != null);
  }

  @DoNotStrip
  public final float baseline(float width, float height) {
    return mBaselineFunction.baseline(this, width, height);
  }

  public boolean isMeasureDefined() {
    return mMeasureFunction != null;
  }

  public void setData(Object data) {
    mData = data;
  }

  public Object getData() {
    return mData;
  }

  private native void jni_YGNodePrint(long nativePointer);

  /**
   * Use the set logger (defaults to adb log) to print out the styles, children, and computed
   * layout of the tree rooted at this node.
   */
  public void print() {
    jni_YGNodePrint(mNativePointer);
  }
}