Expose layout paddding in java api

Summary: Expose layout padding api from D4376572

Reviewed By: passy

Differential Revision: D4377069

fbshipit-source-id: 2e0c04104560e1be586562b27b3457576590dc18

java/com/facebook/yoga/YogaNode.java

@@ -69,6 +69,14 @@ public class YogaNode implements YogaNodeAPI<YogaNode> {
   @DoNotStrip
   private float mLeft = YogaConstants.UNDEFINED;
   @DoNotStrip
+  private float mPaddingLeft = 0;
+  @DoNotStrip
+  private float mPaddingTop = 0;
+  @DoNotStrip
+  private float mPaddingRight = 0;
+  @DoNotStrip
+  private float mPaddingBottom = 0;
+  @DoNotStrip
   private int mLayoutDirection = 0;
 
   private native long jni_YGNodeNew();
@@ -564,6 +572,26 @@ public class YogaNode implements YogaNodeAPI<YogaNode> {
     return mHeight;
   }
 
+  @Override
+  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");
+    }
+  }
+
   @Override
   public YogaDirection getLayoutDirection() {
     return YogaDirection.values()[mLayoutDirection];

java/com/facebook/yoga/YogaNodeAPI.java

@@ -81,6 +81,7 @@ public interface YogaNodeAPI<YogaNodeType extends YogaNodeAPI> {
   float getLayoutY();
   float getLayoutWidth();
   float getLayoutHeight();
+  float getLayoutPadding(YogaEdge edge);
   YogaDirection getLayoutDirection();
   YogaOverflow getOverflow();
   void setOverflow(YogaOverflow overflow);