add EditLayoutTests and add element drag function

src/common/UITestAutomation/Element/Element.cs

@@ -3,7 +3,10 @@
 // See the LICENSE file in the project root for more information.
 
 using System.Collections.ObjectModel;
+using System.Drawing;
 using System.Runtime.CompilerServices;
+using System.Xml.Linq;
+using ABI.Windows.Foundation;
 using Microsoft.VisualStudio.TestTools.UnitTesting;
 using OpenQA.Selenium;
 using OpenQA.Selenium.Appium;
@@ -64,6 +67,14 @@ public bool Selected
             get { return this.windowsElement?.Selected ?? false; }
         }
 
+        /// <summary>
+        /// Gets the Rect of the UI element.
+        /// </summary>
+        public Rectangle? Rect
+        {
+            get { return this.windowsElement?.Rect; }
+        }
+
         /// <summary>
         /// Gets the AutomationID of the UI element.
         /// </summary>
@@ -139,6 +150,42 @@ public virtual void DoubleClick()
             });
         }
 
+        /// <summary>
+        /// Drag element move offset.
+        /// </summary>
+        /// <param name="offsetX">The offsetX to move.</param>
+        /// <param name="offsetY">The offsetY to move.</param>
+        public void Drag(int offsetX, int offsetY)
+        {
+            PerformAction((actions, windowElement) =>
+            {
+                actions.MoveToElement(windowElement).MoveByOffset(10, 10).ClickAndHold(windowElement).MoveByOffset(offsetX, offsetY).Release();
+                actions.Build().Perform();
+            });
+        }
+
+        /// <summary>
+        /// Drag element move to other element.
+        /// </summary>
+        /// <param name="element">Move to this element.</param>
+        public void Drag(Element element)
+        {
+            PerformAction((actions, windowElement) =>
+            {
+                actions.MoveToElement(windowElement).ClickAndHold();
+                Assert.IsNotNull(element.windowsElement, "element is null");
+                int dx = (element.windowsElement.Rect.X - windowElement.Rect.X) / 10;
+                int dy = (element.windowsElement.Rect.Y - windowElement.Rect.Y) / 10;
+                for (int i = 0; i < 10; i++)
+                {
+                    actions.MoveByOffset(dx, dy);
+                }
+
+                actions.Release();
+                actions.Build().Perform();
+            });
+        }
+
         /// <summary>
         /// Send Key of the element.
         /// </summary>