ES-975464 - Resolve the ReadMe file length issue in this sample repository

README.md

@@ -1,2 +1,152 @@
-# How to drag and drop rows between datagrid and listview in wpf?
-This example illustrates how to drag and drop rows between datagrid and listview in wpf
+# How to drag and drop rows between datagrid and treegrid in wpf
+
+This example illustrates how to drag and drop rows between [WPF DataGrid](https://www.syncfusion.com/wpf-controls/datagrid) and [WPF TreeGrid](https://www.syncfusion.com/wpf-controls/treegrid).
+
+To perform the dragging operation between `SfDataGrid` and `SfTreeGrid` by using the [GridRowDragDropController.Drop](https://help.syncfusion.com/cr/wpf/Syncfusion.UI.Xaml.Grid.GridRowDragDropController.html#Syncfusion_UI_Xaml_Grid_GridRowDragDropController_Drop) and [TreeGridRowDragDropController.Drop](https://help.syncfusion.com/cr/wpf/Syncfusion.UI.Xaml.TreeGrid.TreeGridRowDragDropController.html#Syncfusion_UI_Xaml_TreeGrid_TreeGridRowDragDropController_Drop) events.
+
+``` c#
+this.sfDataGrid.RowDragDropController.Drop += sfDataGrid_Drop;
+this.sfTreeGrid.RowDragDropController.Drop += sfTreeGrid_Drop;
+
+/// <summary>
+/// Customized TreeGrid Drop event.
+/// </summary>
+/// <param name="sender"></param>
+/// <param name="e"></param>
+private void sfTreeGrid_Drop(object sender, TreeGridRowDropEventArgs e)
+{
+    if (e.IsFromOutSideSource)
+    {
+        var draggingRecord = e.Data.GetData("Records") as ObservableCollection<object>;
+        var record = draggingRecord[0] as EmployeeInfo;
+        var dropPosition = e.DropPosition.ToString();
+        var newItem = new EmployeeInfo();
+        var rowIndex =AssociatedObject.sfTreeGrid.ResolveToRowIndex(e.TargetNode.Item);
+        if (dropPosition != "None" && rowIndex != -1)
+        {
+            if (AssociatedObject.sfTreeGrid.View is TreeGridSelfRelationalView)
+            {
+                var treeNode = e.TargetNode;
+                if (treeNode == null)
+                    return;
+                var data = treeNode.Item;
+                AssociatedObject.sfTreeGrid.SelectionController.SuspendUpdates();
+                var dropIndex = -1;
+                TreeNode parentNode = null;
+                if (dropPosition == "DropBelow" || dropPosition == "DropAbove")
+                {
+                    parentNode = treeNode.ParentNode;
+                    if (parentNode == null)
+                    {
+                        var treeNodeItem = treeNode.Item as EmployeeInfo;
+                        newItem = new EmployeeInfo() { FirstName = record.FirstName, LastName = record.LastName, ID = record.ID, Salary = record.Salary, Title = record.Title, ReportsTo = treeNodeItem.ReportsTo };
+                    }
+                    else
+                    {
+                        var parentNodeItems = parentNode.Item as EmployeeInfo;
+                        newItem = new EmployeeInfo() { FirstName = record.FirstName, LastName = record.LastName, ID = record.ID, Salary = record.Salary, Title = record.Title, ReportsTo = parentNodeItems.ID };
+                    }
+                }
+                else if (dropPosition == "DropAsChild")
+                {
+                    if (!treeNode.IsExpanded)
+                        AssociatedObject.sfTreeGrid.ExpandNode(treeNode);
+                    parentNode = treeNode;
+                    var parentNodeItems = parentNode.Item as EmployeeInfo;
+                    newItem = new EmployeeInfo() { FirstName = record.FirstName, LastName = record.LastName, ID = record.ID, Salary = record.Salary, Title = record.Title, ReportsTo = parentNodeItems.ID };
+                }
+                IList sourceCollection = null;
+                if (dropPosition == "DropBelow" || dropPosition == "DropAbove")
+                {
+                    if (treeNode.ParentNode != null)
+                    {
+                        var collection = AssociatedObject.sfTreeGrid.View.GetPropertyAccessProvider().GetValue(treeNode.ParentNode.Item, AssociatedObject.sfTreeGrid.ChildPropertyName) as IEnumerable;
+                        sourceCollection = GetSourceListCollection(collection);
+                    }
+                    else
+                    {
+                        sourceCollection = GetSourceListCollection(AssociatedObject.sfTreeGrid.View.SourceCollection);
+                    }
+                    dropIndex = sourceCollection.IndexOf(data);
+                    if (dropPosition == "DropBelow")
+                    {
+                        dropIndex += 1;
+                    }
+                }
+                else if (dropPosition == "DropAsChild")
+                {
+                    var collection = AssociatedObject.sfTreeGrid.View.GetPropertyAccessProvider().GetValue(data, AssociatedObject.sfTreeGrid.ChildPropertyName) as IEnumerable;
+                    sourceCollection = GetSourceListCollection(collection);
+                    if (sourceCollection == null)
+                    {
+                        var list = data.GetType().GetProperty(AssociatedObject.sfTreeGrid.ChildPropertyName).PropertyType.CreateNew() as IList;
+                        if (list != null)
+                        {
+                            AssociatedObject.sfTreeGrid.View.GetPropertyAccessProvider().SetValue(treeNode.Item, AssociatedObject.sfTreeGrid.ChildPropertyName, list);
+                            sourceCollection = list;
+                        }
+                    }
+                    dropIndex = sourceCollection.Count;
+                }
+                sourceCollection.Insert(dropIndex, newItem);
+                AssociatedObject.sfTreeGrid.SelectionController.ResumeUpdates();
+                (AssociatedObject.sfTreeGrid.SelectionController as TreeGridRowSelectionController).RefreshSelection();
+                e.Handled = true;
+            }
+        }
+        AssociatedObject.sfDataGrid.View.Remove(record);
+    }
+}
+
+/// <summary>
+/// Gets the source collection of TreeGrid
+/// </summary>
+/// <param name="collection"></param>
+/// <returns></returns>
+private IList GetSourceListCollection(IEnumerable collection)
+{
+    IList list = null;
+    if (collection == null)
+        collection = AssociatedObject.sfTreeGrid.View.SourceCollection;
+    if ((collection as IList) != null)
+    {
+        list = collection as IList;
+    }
+    return list;
+}
+
+/// <summary>
+/// Customize the Drop event.restrict the certain record and Drop position from drop.
+/// </summary>
+/// <param name="sender"></param>
+/// <param name="e"></param>
+private void sfDataGrid_Drop(object sender, GridRowDropEventArgs e)
+{
+    if (e.IsFromOutSideSource)
+    {
+        var draggingRecord = e.Data.GetData("Nodes") as ObservableCollection<TreeNode>;
+        var record = draggingRecord[0].Item as EmployeeInfo;
+        int dropIndex = (int)e.TargetRecord;
+        var dropPosition = e.DropPosition.ToString();
+        if (record.Title == "Manager")
+        {
+            e.Handled = true;
+            return;
+        }
+        IList collection = null;
+        collection = AssociatedObject.sfDataGrid.View.SourceCollection as IList;
+        if (dropPosition == "DropAbove")
+        {
+            dropIndex--;
+            collection.Insert(dropIndex, record);
+        }
+        else
+        {
+            dropIndex++;
+            collection.Insert(dropIndex, record);   
+        }
+        AssociatedObject.sfTreeGrid.View.Remove(record);
+        e.Handled = true;
+    }
+}
+```