Synchronize the Net40

Net40/HandyControl_Net40/Controls/Transfer/TransferGroup.cs

@@ -0,0 +1,54 @@
+using System.Collections.Specialized;
+using System.Windows;
+
+namespace HandyControl.Controls
+{
+    public class TransferGroup : SimpleItemsControl
+    {
+        protected override void Refresh()
+        {
+            if (Items.Count > 0)
+            {
+                foreach (FrameworkElement item in Items)
+                {
+                    item.Style = ItemContainerStyle;
+                    ItemsHost.Children.Add(item);
+                }
+            }
+        }
+
+        protected override void OnItemTemplateChanged(DependencyPropertyChangedEventArgs e)
+        {
+
+        }
+
+        protected override void OnItemContainerStyleChanged(DependencyPropertyChangedEventArgs e)
+        {
+
+        }
+
+        protected override DependencyObject GetContainerForItemOverride() => new TransferItem();
+
+        protected override bool IsItemItsOwnContainerOverride(object item) => item is TransferItem;
+
+        protected override void OnItemsChanged(object sender, NotifyCollectionChangedEventArgs e)
+        {
+            if (ItemsHost == null) return;
+            if (e.OldItems != null)
+            {
+                foreach (FrameworkElement item in e.OldItems)
+                {
+                    ItemsHost.Children.Remove(item);
+                }
+            }
+            if (e.NewItems != null)
+            {
+                foreach (FrameworkElement item in e.NewItems)
+                {
+                    item.Style = ItemContainerStyle;
+                    ItemsHost.Children.Add(item);
+                }
+            }
+        }
+    }
+}