Add layout params copy constructors

android/widgets/src/main/java/org/nativescript/widgets/CommonLayoutParams.java

@@ -29,6 +29,39 @@ public class CommonLayoutParams extends FrameLayout.LayoutParams {
         super(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT, Gravity.FILL);
     }
 
+    public CommonLayoutParams(ViewGroup.LayoutParams source) {
+        super(source);
+    }
+
+    public CommonLayoutParams(ViewGroup.MarginLayoutParams source) {
+        super(source);
+    }
+
+    public CommonLayoutParams(FrameLayout.LayoutParams source) {
+        super((ViewGroup.MarginLayoutParams) source);
+        this.gravity = source.gravity;
+    }
+
+    public CommonLayoutParams(CommonLayoutParams source) {
+        this((FrameLayout.LayoutParams) source);
+
+        this.widthPercent = source.widthPercent;
+        this.heightPercent = source.heightPercent;
+
+        this.topMargin = source.topMargin;
+        this.leftMargin = source.leftMargin;
+        this.bottomMargin = source.bottomMargin;
+        this.rightMargin = source.rightMargin;
+
+        this.left = source.left;
+        this.top = source.top;
+        this.row = source.row;
+        this.column = source.column;
+        this.rowSpan = source.rowSpan;
+        this.columnSpan = source.columnSpan;
+        this.dock = source.dock;
+    }
+
     public float widthPercent = 0;
     public float heightPercent = 0;
 

android/widgets/src/main/java/org/nativescript/widgets/FlexboxLayout.java

@@ -27,6 +27,7 @@ import android.util.AttributeSet;
 import android.util.SparseIntArray;
 import android.view.View;
 import android.view.ViewGroup;
+import android.widget.FrameLayout;
 import android.widget.LinearLayout;
 import android.widget.RelativeLayout;
 
@@ -2221,8 +2222,20 @@ public class FlexboxLayout extends ViewGroup {
     }
 
     @Override
-    protected ViewGroup.LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) {
+    protected ViewGroup.LayoutParams generateLayoutParams(ViewGroup.LayoutParams from) {
-        return new FlexboxLayout.LayoutParams();
+        if (from instanceof FlexboxLayout.LayoutParams)
+            return new FlexboxLayout.LayoutParams((FlexboxLayout.LayoutParams)from);
+
+        if (from instanceof CommonLayoutParams)
+            return new FlexboxLayout.LayoutParams((CommonLayoutParams)from);
+
+        if (from instanceof FrameLayout.LayoutParams)
+            return new FlexboxLayout.LayoutParams((FrameLayout.LayoutParams)from);
+
+        if (from instanceof ViewGroup.MarginLayoutParams)
+            return new FlexboxLayout.LayoutParams((ViewGroup.MarginLayoutParams)from);
+
+        return new FlexboxLayout.LayoutParams(from);
     }
 
     @FlexDirection
@@ -2631,6 +2644,32 @@ public class FlexboxLayout extends ViewGroup {
         public LayoutParams() {
             super();
         }
+
+        public LayoutParams(ViewGroup.LayoutParams source) {
+            super(source);
+        }
+
+        public LayoutParams(ViewGroup.MarginLayoutParams source) {
+            super(source);
+        }
+
+        public LayoutParams(FrameLayout.LayoutParams source) {
+            super(source);
+        }
+
+        public LayoutParams(CommonLayoutParams source) {
+            super(source);
+        }
+
+        public LayoutParams(LayoutParams source) {
+            super(source);
+
+            this.order = source.order;
+            this.flexGrow = source.flexGrow;
+            this.flexShrink = source.flexShrink;
+            this.wrapBefore = source.wrapBefore;
+            this.alignSelf = source.alignSelf;
+        }
     }
 
     /**

android/widgets/src/main/java/org/nativescript/widgets/HorizontalScrollView.java

@@ -7,9 +7,11 @@ import android.content.Context;
 import android.graphics.Rect;
 import android.os.Parcel;
 import android.os.Parcelable;
+import android.util.AttributeSet;
 import android.view.View;
 import android.view.ViewGroup;
 import android.view.ViewParent;
+import android.widget.FrameLayout;
 
 /**
  * @author hhristov
@@ -52,6 +54,41 @@ public class HorizontalScrollView extends android.widget.HorizontalScrollView {
         super.requestLayout();
     }
 
+    @Override
+    protected CommonLayoutParams generateDefaultLayoutParams() {
+        return new CommonLayoutParams();
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public CommonLayoutParams generateLayoutParams(AttributeSet attrs) {
+        return new CommonLayoutParams();
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {
+        return p instanceof CommonLayoutParams;
+    }
+
+    @Override
+    protected ViewGroup.LayoutParams generateLayoutParams(ViewGroup.LayoutParams from) {
+        if (from instanceof CommonLayoutParams)
+            return new CommonLayoutParams((CommonLayoutParams)from);
+
+        if (from instanceof FrameLayout.LayoutParams)
+            return new CommonLayoutParams((FrameLayout.LayoutParams)from);
+
+        if (from instanceof ViewGroup.MarginLayoutParams)
+            return new CommonLayoutParams((ViewGroup.MarginLayoutParams)from);
+
+        return new CommonLayoutParams(from);
+    }
+
     @Override
     public void requestChildFocus(View child, View focused) {
         if (!mIsLayoutDirty) {

android/widgets/src/main/java/org/nativescript/widgets/LayoutBase.java

@@ -42,8 +42,17 @@ public abstract class LayoutBase extends ViewGroup {
     }
 
     @Override
-    protected LayoutParams generateLayoutParams(LayoutParams p) {
+    protected ViewGroup.LayoutParams generateLayoutParams(ViewGroup.LayoutParams from) {
-        return new CommonLayoutParams();
+        if (from instanceof CommonLayoutParams)
+            return new CommonLayoutParams((CommonLayoutParams)from);
+
+        if (from instanceof FrameLayout.LayoutParams)
+            return new CommonLayoutParams((FrameLayout.LayoutParams)from);
+
+        if (from instanceof ViewGroup.MarginLayoutParams)
+            return new CommonLayoutParams((ViewGroup.MarginLayoutParams)from);
+
+        return new CommonLayoutParams(from);
     }
 
 	@Override

android/widgets/src/main/java/org/nativescript/widgets/VerticalScrollView.java

@@ -7,7 +7,10 @@ import org.nativescript.widgets.HorizontalScrollView.SavedState;
 import android.content.Context;
 import android.graphics.Rect;
 import android.os.Parcelable;
+import android.util.AttributeSet;
 import android.view.View;
+import android.view.ViewGroup;
+import android.widget.FrameLayout;
 import android.widget.ScrollView;
 
 /**
@@ -51,6 +54,41 @@ public class VerticalScrollView extends ScrollView {
 		super.requestLayout();
 	}
 
+	@Override
+	protected CommonLayoutParams generateDefaultLayoutParams() {
+		return new CommonLayoutParams();
+	}
+
+	/**
+	 * {@inheritDoc}
+	 */
+	@Override
+	public CommonLayoutParams generateLayoutParams(AttributeSet attrs) {
+		return new CommonLayoutParams();
+	}
+
+	/**
+	 * {@inheritDoc}
+	 */
+	@Override
+	protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {
+		return p instanceof CommonLayoutParams;
+	}
+
+	@Override
+	protected ViewGroup.LayoutParams generateLayoutParams(ViewGroup.LayoutParams from) {
+		if (from instanceof CommonLayoutParams)
+			return new CommonLayoutParams((CommonLayoutParams)from);
+
+		if (from instanceof FrameLayout.LayoutParams)
+			return new CommonLayoutParams((FrameLayout.LayoutParams)from);
+
+		if (from instanceof ViewGroup.MarginLayoutParams)
+			return new CommonLayoutParams((ViewGroup.MarginLayoutParams)from);
+
+		return new CommonLayoutParams(from);
+	}
+
 	@Override
 	public void requestChildFocus(View child, View focused) {
 	    if (!this.mIsLayoutDirty) {