Android: Implement margin(Start|End) styles for RN

Reviewed By: achen1

Differential Revision: D5907651

fbshipit-source-id: 4df7583483e6f10b5433b9fa9d9345e00ccedd20

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

@@ -551,31 +551,38 @@ public class LayoutShadowNode extends ReactShadowNodeImpl {
     }
   }
 
-  @ReactPropGroup(names = {
+  @ReactPropGroup(
+    names = {
       ViewProps.MARGIN,
       ViewProps.MARGIN_VERTICAL,
       ViewProps.MARGIN_HORIZONTAL,
-      ViewProps.MARGIN_LEFT,
-      ViewProps.MARGIN_RIGHT,
+      ViewProps.MARGIN_START,
+      ViewProps.MARGIN_END,
       ViewProps.MARGIN_TOP,
       ViewProps.MARGIN_BOTTOM,
-  })
+      ViewProps.MARGIN_LEFT,
+      ViewProps.MARGIN_RIGHT,
+    }
+  )
   public void setMargins(int index, Dynamic margin) {
     if (isVirtual()) {
       return;
     }
 
+    int spacingType =
+        maybeTransformLeftRightToStartEnd(ViewProps.PADDING_MARGIN_SPACING_TYPES[index]);
+
     mTempYogaValue.setFromDynamic(margin);
     switch (mTempYogaValue.unit) {
       case POINT:
       case UNDEFINED:
-        setMargin(ViewProps.PADDING_MARGIN_SPACING_TYPES[index], mTempYogaValue.value);
+        setMargin(spacingType, mTempYogaValue.value);
         break;
       case AUTO:
-        setMarginAuto(ViewProps.PADDING_MARGIN_SPACING_TYPES[index]);
+        setMarginAuto(spacingType);
         break;
       case PERCENT:
-        setMarginPercent(ViewProps.PADDING_MARGIN_SPACING_TYPES[index], mTempYogaValue.value);
+        setMarginPercent(spacingType, mTempYogaValue.value);
         break;
     }
 
@@ -600,20 +607,8 @@ public class LayoutShadowNode extends ReactShadowNodeImpl {
       return;
     }
 
-    int spacingType = ViewProps.PADDING_MARGIN_SPACING_TYPES[index];
-
-    if (I18nUtil.getInstance().doesRTLFlipLeftAndRightStyles(getThemedContext())) {
-      switch (spacingType) {
-        case Spacing.LEFT:
-          spacingType = Spacing.START;
-          break;
-        case Spacing.RIGHT:
-          spacingType = Spacing.END;
-          break;
-        default:
-          break;
-      }
-    }
+    int spacingType =
+        maybeTransformLeftRightToStartEnd(ViewProps.PADDING_MARGIN_SPACING_TYPES[index]);
 
     mTempYogaValue.setFromDynamic(padding);
     switch (mTempYogaValue.unit) {
@@ -662,20 +657,7 @@ public class LayoutShadowNode extends ReactShadowNodeImpl {
       Spacing.START, Spacing.END, Spacing.LEFT, Spacing.RIGHT, Spacing.TOP, Spacing.BOTTOM
     };
 
-    int spacingType = POSITION_SPACING_TYPES[index];
-
-    if (I18nUtil.getInstance().doesRTLFlipLeftAndRightStyles(getThemedContext())) {
-      switch (spacingType) {
-        case Spacing.LEFT:
-          spacingType = Spacing.START;
-          break;
-        case Spacing.RIGHT:
-          spacingType = Spacing.END;
-          break;
-        default:
-          break;
-      }
-    }
+    int spacingType = maybeTransformLeftRightToStartEnd(POSITION_SPACING_TYPES[index]);
 
     mTempYogaValue.setFromDynamic(position);
     switch (mTempYogaValue.unit) {
@@ -691,6 +673,21 @@ public class LayoutShadowNode extends ReactShadowNodeImpl {
     position.recycle();
   }
 
+  private int maybeTransformLeftRightToStartEnd(int spacingType) {
+    if (!I18nUtil.getInstance().doesRTLFlipLeftAndRightStyles(getThemedContext())) {
+      return spacingType;
+    }
+
+    switch (spacingType) {
+      case Spacing.LEFT:
+        return Spacing.START;
+      case Spacing.RIGHT:
+        return Spacing.END;
+      default:
+        return spacingType;
+    }
+  }
+
   @ReactProp(name = ViewProps.POSITION)
   public void setPosition(@Nullable String position) {
     if (isVirtual()) {

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

@@ -47,6 +47,8 @@ public class ViewProps {
   public static final String MARGIN_RIGHT = "marginRight";
   public static final String MARGIN_TOP = "marginTop";
   public static final String MARGIN_BOTTOM = "marginBottom";
+  public static final String MARGIN_START = "marginStart";
+  public static final String MARGIN_END = "marginEnd";
 
   public static final String PADDING = "padding";
   public static final String PADDING_VERTICAL = "paddingVertical";
@@ -174,6 +176,8 @@ public class ViewProps {
               MARGIN_RIGHT,
               MARGIN_TOP,
               MARGIN_BOTTOM,
+              MARGIN_START,
+              MARGIN_END,
 
               /* paddings */
               PADDING,