Added support for corner radii in Android

Summary:
This is a cut down version of a previous pull request with just the 4 corners catered for.
Closes https://github.com/facebook/react-native/pull/4252

Reviewed By: svcscm

Differential Revision: D2911959

Pulled By: androidtrunkagent

fb-gh-sync-id: 7ddcd684d90d4d92ccefed906c0126e92818dcde

Examples/UIExplorer/BorderExample.js

@@ -98,6 +98,20 @@ var styles = StyleSheet.create({
     marginRight: 10,
     backgroundColor: 'lightgrey',
   },
+  border9: {
+    borderWidth: 10,
+    borderTopLeftRadius: 10,
+    borderBottomRightRadius: 20,
+    borderColor: 'black',
+  },
+  border10: {
+    borderWidth: 10,
+    backgroundColor: 'white',
+    borderTopLeftRadius: 10,
+    borderBottomRightRadius: 20,
+    borderColor: 'black',
+    elevation: 10
+  }
 });
 
 exports.title = 'Border';
@@ -180,4 +194,19 @@ exports.examples = [
       );
     }
   },
+  {
+    title: 'Corner Radii',
+    description: 'borderTopLeftRadius & borderBottomRightRadius',
+    render() {
+      return <View style={[styles.box, styles.border9]} />;
+    }
+  },
+  {
+    title: 'Corner Radii / Elevation',
+    description: 'borderTopLeftRadius & borderBottomRightRadius & elevation',
+    platform: 'android',
+    render() {
+      return <View style={[styles.box, styles.border10]} />;
+    }
+  },
 ];

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

@@ -77,6 +77,11 @@ public class ViewProps {
   public static final String BORDER_TOP_WIDTH = "borderTopWidth";
   public static final String BORDER_RIGHT_WIDTH = "borderRightWidth";
   public static final String BORDER_BOTTOM_WIDTH = "borderBottomWidth";
+  public static final String BORDER_RADIUS = "borderRadius";
+  public static final String BORDER_TOP_LEFT_RADIUS = "borderTopLeftRadius";
+  public static final String BORDER_TOP_RIGHT_RADIUS = "borderTopRightRadius";
+  public static final String BORDER_BOTTOM_LEFT_RADIUS = "borderBottomLeftRadius";
+  public static final String BORDER_BOTTOM_RIGHT_RADIUS = "borderBottomRightRadius";
   public static final int[] BORDER_SPACING_TYPES = {
       Spacing.ALL, Spacing.LEFT, Spacing.RIGHT, Spacing.TOP, Spacing.BOTTOM
   };

ReactAndroid/src/main/java/com/facebook/react/views/view/ReactViewBackgroundDrawable.java

@@ -11,6 +11,7 @@ package com.facebook.react.views.view;
 
 import javax.annotation.Nullable;
 
+import java.util.Arrays;
 import java.util.Locale;
 
 import android.graphics.Canvas;
@@ -78,7 +79,9 @@ import com.facebook.csslayout.Spacing;
   /* Used for rounded border and rounded background */
   private @Nullable PathEffect mPathEffectForBorderStyle;
   private @Nullable Path mPathForBorderRadius;
+  private @Nullable Path mPathForBorderRadiusOutline;
   private @Nullable RectF mTempRectForBorderRadius;
+  private @Nullable RectF mTempRectForBorderRadiusOutline;
   private boolean mNeedUpdatePathForBorderRadius = false;
   private float mBorderRadius = CSSConstants.UNDEFINED;
 
@@ -87,9 +90,11 @@ import com.facebook.csslayout.Spacing;
   private int mColor = Color.TRANSPARENT;
   private int mAlpha = 255;
 
+  private @Nullable float[] mBorderCornerRadii;
+
   @Override
   public void draw(Canvas canvas) {
-    if (!CSSConstants.isUndefined(mBorderRadius) && mBorderRadius > 0) {
+    if ((!CSSConstants.isUndefined(mBorderRadius) && mBorderRadius > 0) || mBorderCornerRadii != null) {
       drawRoundedBackgroundWithBorders(canvas);
     } else {
       drawRectangularBackgroundWithBorders(canvas);
@@ -132,11 +137,10 @@ import com.facebook.csslayout.Spacing;
       super.getOutline(outline);
       return;
     }
-    if(!CSSConstants.isUndefined(mBorderRadius) && mBorderRadius > 0) {
+    if((!CSSConstants.isUndefined(mBorderRadius) && mBorderRadius > 0) || mBorderCornerRadii != null) {
-      float extraRadiusFromBorderWidth = (mBorderWidth != null)
+      updatePath();
-              ? mBorderWidth.get(Spacing.ALL) / 2f
+
-              : 0;
+      outline.setConvexPath(mPathForBorderRadiusOutline);
-      outline.setRoundRect(getBounds(), mBorderRadius + extraRadiusFromBorderWidth);
     } else {
       outline.setRect(getBounds());
     }
@@ -181,8 +185,22 @@ import com.facebook.csslayout.Spacing;
   }
 
   public void setRadius(float radius) {
-    if (mBorderRadius != radius) {
+    if (!FloatUtil.floatsEqual(mBorderRadius,radius)) {
       mBorderRadius = radius;
+      mNeedUpdatePathForBorderRadius = true;
+      invalidateSelf();
+    }
+  }
+
+  public void setRadius(float radius, int position) {
+    if (mBorderCornerRadii == null) {
+      mBorderCornerRadii = new float[4];
+      Arrays.fill(mBorderCornerRadii, CSSConstants.UNDEFINED);
+    }
+
+    if (!FloatUtil.floatsEqual(mBorderCornerRadii[position], radius)) {
+      mBorderCornerRadii[position] = radius;
+      mNeedUpdatePathForBorderRadius = true;
       invalidateSelf();
     }
   }
@@ -225,17 +243,59 @@ import com.facebook.csslayout.Spacing;
     if (mPathForBorderRadius == null) {
       mPathForBorderRadius = new Path();
       mTempRectForBorderRadius = new RectF();
+      mPathForBorderRadiusOutline = new Path();
+      mTempRectForBorderRadiusOutline = new RectF();
     }
+
     mPathForBorderRadius.reset();
+    mPathForBorderRadiusOutline.reset();
+
     mTempRectForBorderRadius.set(getBounds());
+    mTempRectForBorderRadiusOutline.set(getBounds());
     float fullBorderWidth = getFullBorderWidth();
     if (fullBorderWidth > 0) {
       mTempRectForBorderRadius.inset(fullBorderWidth * 0.5f, fullBorderWidth * 0.5f);
     }
+
+    float defaultBorderRadius = !CSSConstants.isUndefined(mBorderRadius) ? mBorderRadius : 0;
+    float topLeftRadius = mBorderCornerRadii != null && !CSSConstants.isUndefined(mBorderCornerRadii[0]) ? mBorderCornerRadii[0] : defaultBorderRadius;
+    float topRightRadius = mBorderCornerRadii != null && !CSSConstants.isUndefined(mBorderCornerRadii[1]) ? mBorderCornerRadii[1] : defaultBorderRadius;
+    float bottomRightRadius = mBorderCornerRadii != null && !CSSConstants.isUndefined(mBorderCornerRadii[2]) ? mBorderCornerRadii[2] : defaultBorderRadius;
+    float bottomLeftRadius = mBorderCornerRadii != null && !CSSConstants.isUndefined(mBorderCornerRadii[3]) ? mBorderCornerRadii[3] : defaultBorderRadius;
+
+
     mPathForBorderRadius.addRoundRect(
         mTempRectForBorderRadius,
-        mBorderRadius,
+        new float[] {
-        mBorderRadius,
+          topLeftRadius,
+          topLeftRadius,
+          topRightRadius,
+          topRightRadius,
+          bottomRightRadius,
+          bottomRightRadius,
+          bottomLeftRadius,
+          bottomLeftRadius
+        },
+        Path.Direction.CW);
+
+    float extraRadiusForOutline = 0;
+
+    if (mBorderWidth != null) {
+      extraRadiusForOutline = mBorderWidth.get(Spacing.ALL) / 2f;
+    }
+
+    mPathForBorderRadiusOutline.addRoundRect(
+      mTempRectForBorderRadiusOutline,
+      new float[] {
+        topLeftRadius + extraRadiusForOutline,
+        topLeftRadius + extraRadiusForOutline,
+        topRightRadius + extraRadiusForOutline,
+        topRightRadius + extraRadiusForOutline,
+        bottomRightRadius + extraRadiusForOutline,
+        bottomRightRadius + extraRadiusForOutline,
+        bottomLeftRadius + extraRadiusForOutline,
+        bottomLeftRadius + extraRadiusForOutline
+      },
       Path.Direction.CW);
 
     mPathEffectForBorderStyle = mBorderStyle != null

ReactAndroid/src/main/java/com/facebook/react/views/view/ReactViewGroup.java

@@ -207,6 +207,10 @@ public class ReactViewGroup extends ViewGroup implements
     getOrCreateReactViewBackground().setRadius(borderRadius);
   }
 
+  public void setBorderRadius(float borderRadius, int position) {
+    getOrCreateReactViewBackground().setRadius(borderRadius, position);
+  }
+
   public void setBorderStyle(@Nullable String style) {
     getOrCreateReactViewBackground().setBorderStyle(style);
   }

ReactAndroid/src/main/java/com/facebook/react/views/view/ReactViewManager.java

@@ -51,9 +51,23 @@ public class ReactViewManager extends ViewGroupManager<ReactViewGroup> {
     view.setFocusable(accessible);
   }
 
-  @ReactProp(name = "borderRadius")
+  @ReactPropGroup(names = {
-  public void setBorderRadius(ReactViewGroup view, float borderRadius) {
+      ViewProps.BORDER_RADIUS,
-    view.setBorderRadius(PixelUtil.toPixelFromDIP(borderRadius));
+      ViewProps.BORDER_TOP_LEFT_RADIUS,
+      ViewProps.BORDER_TOP_RIGHT_RADIUS,
+      ViewProps.BORDER_BOTTOM_RIGHT_RADIUS,
+      ViewProps.BORDER_BOTTOM_LEFT_RADIUS
+  }, defaultFloat = CSSConstants.UNDEFINED)
+  public void setBorderRadius(ReactViewGroup view, int index, float borderRadius) {
+    if (!CSSConstants.isUndefined(borderRadius)) {
+      borderRadius = PixelUtil.toPixelFromDIP(borderRadius);
+    }
+
+    if (index == 0) {
+      view.setBorderRadius(borderRadius);
+    } else {
+      view.setBorderRadius(borderRadius, index - 1);
+    }
   }
 
   @ReactProp(name = "borderStyle")