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Src/Xceed.Wpf.Toolkit/CollectionControl/Implementation/Converters/NewItemTypesComboBoxConverter.cs

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+/*************************************************************************************
+
+   Extended WPF Toolkit
+
+   Copyright (C) 2007-2013 Xceed Software Inc.
+
+   This program is provided to you under the terms of the Microsoft Public
+   License (Ms-PL) as published at http://wpftoolkit.codeplex.com/license 
+
+   For more features, controls, and fast professional support,
+   pick up the Plus Edition at http://xceed.com/wpf_toolkit
+
+   Stay informed: follow @datagrid on Twitter or Like http://facebook.com/datagrids
+
+  ***********************************************************************************/
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Windows.Data;
+using System.Globalization;
+using Xceed.Wpf.Toolkit.Core.Utilities;
+
+namespace Xceed.Wpf.Toolkit.Converters
+{
+  /// <summary>
+  /// This multi-value converter is used in the CollectionControl template
+  /// to determine the list of possible new item types that will be shown in the combo box.
+  /// 
+  /// If the second value (i.e., CollectionControl.NewItemTypes) is not null, this list will be used.
+  /// Otherwise, if the first value (i.e., CollectionControl.ItemsSourceType) is a "IList&lt;T&gt;"
+  /// type, the new item type list will contain "T".
+  /// 
+  /// </summary>
+  public class NewItemTypesComboBoxConverter : IMultiValueConverter
+  {
+    public object Convert( object[] values, Type targetType, object parameter, CultureInfo culture )
+    {
+
+      if( values.Length != 2 )
+        throw new ArgumentException("The 'values' argument should contain 2 objects.");
+
+      if( values[ 1 ] != null )
+      {
+        if( !values[ 1 ].GetType().IsGenericType || !(values[ 1 ].GetType().GetGenericArguments().First().GetType() is Type) )
+          throw new ArgumentException( "The 'value' argument is not of the correct type." );
+
+        return values[ 1 ];
+      }
+      else if( values[ 0 ] != null )
+      {
+        if( !( values[ 0 ].GetType() is Type ) )
+          throw new ArgumentException( "The 'value' argument is not of the correct type." );
+
+        List<Type> types = new List<Type>();
+        Type listType = ListUtilities.GetListItemType( ( Type )values[ 0 ] );
+        if( listType != null )
+        {
+          types.Add( listType );
+        }
+
+        return types;
+      }
+
+      return null;
+    }
+
+    public object[] ConvertBack( object value, Type[] targetTypes, object parameter, CultureInfo culture )
+    {
+      throw new NotImplementedException();
+    }
+  }
+}