Exposed properties to allow image to be cropped when there is border radius

src/org/nativescript/widgets/ImageView.java

@@ -4,6 +4,7 @@
 package org.nativescript.widgets;
 
 import android.content.Context;
+import android.graphics.*;
 import android.graphics.drawable.Drawable;
 
 /**
@@ -11,6 +12,11 @@ import android.graphics.drawable.Drawable;
  * 
  */
 public class ImageView extends android.widget.ImageView {
+    private float cornerRadius = 0;
+    private float borderWidth = 0;
+
+    private Path path = new Path();
+    private RectF rect = new RectF();
 
     private double scaleW = 1;
     private double scaleH = 1;
@@ -20,6 +26,28 @@ public class ImageView extends android.widget.ImageView {
         this.setScaleType(ScaleType.FIT_CENTER);
     }
 
+    public float getCornerRadius() {
+        return this.cornerRadius;
+    }
+
+    public void setCornerRadius(float radius) {
+        if (radius != this.cornerRadius) {
+            this.cornerRadius = radius;
+            this.invalidate();
+        }
+    }
+
+    public float getBorderWidth() {
+        return this.borderWidth;
+    }
+
+    public void setBorderWidth(float radius) {
+        if (radius != this.borderWidth) {
+            this.borderWidth = radius;
+            this.invalidate();
+        }
+    }
+
     @Override
     protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
 
@@ -35,8 +63,7 @@ public class ImageView extends android.widget.ImageView {
         if (drawable != null) {
             measureWidth = drawable.getIntrinsicWidth();
             measureHeight = drawable.getIntrinsicHeight();
-        }
-        else {
+        } else {
             measureWidth = 0;
             measureHeight = 0;
         }
@@ -81,13 +108,7 @@ public class ImageView extends android.widget.ImageView {
         this.setMeasuredDimension(widthSizeAndState, heightSizeAndState);
     }
 
-	private void computeScaleFactor(
-			int measureWidth, 
-	    	int measureHeight, 
-	    	boolean widthIsFinite, 
-	    	boolean heightIsFinite, 
-	    	double nativeWidth, 
-	    	double nativeHeight) {
+    private void computeScaleFactor(int measureWidth, int measureHeight, boolean widthIsFinite, boolean heightIsFinite, double nativeWidth, double nativeHeight) {
 
         this.scaleW = 1;
         this.scaleH = 1;
@@ -101,11 +122,9 @@ public class ImageView extends android.widget.ImageView {
 
             if (!widthIsFinite) {
                 this.scaleW = scaleH;
-            }
-            else if (!heightIsFinite) {
+            } else if (!heightIsFinite) {
                 this.scaleH = scaleW;
-            }
-            else {
+            } else {
                 // No infinite dimensions.
                 switch (scale) {
                 case FIT_CENTER:
@@ -122,4 +141,28 @@ public class ImageView extends android.widget.ImageView {
             }
         }
     }
+
+    @Override
+    protected void onDraw(Canvas canvas) {
+        // floor the border width to avoid gaps between the border and the image
+        float roundedBorderWidth = (float) Math.floor(this.borderWidth);
+        float innerRadius = Math.max(0, this.cornerRadius - roundedBorderWidth);
+
+        // The border width is included in the padding so there is no need for
+        // clip if there is no inner border radius.
+        if (innerRadius != 0) {
+            this.rect.set(
+                    roundedBorderWidth,
+                    roundedBorderWidth, 
+                    this.getWidth() - roundedBorderWidth, 
+                    this.getHeight() - roundedBorderWidth);
+
+            this.path.reset();
+            this.path.addRoundRect(rect, innerRadius, innerRadius, android.graphics.Path.Direction.CW);
+
+            canvas.clipPath(this.path);
+        }
+
+        super.onDraw(canvas);
+    }
 }