wpftoolkit/ExtendedWPFToolkitSolution/Src/Xceed.Wpf.Toolkit/PropertyGrid/Implementation/Editors/SourceComboBoxEditor.cs

/*************************************************************************************

   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;
using System.ComponentModel;
using System.Globalization;
using System.Windows.Data;

namespace Xceed.Wpf.Toolkit.PropertyGrid.Editors
{
  public class SourceComboBoxEditor : ComboBoxEditor
  {
    ICollection _collection;
    TypeConverter _typeConverter;

    public SourceComboBoxEditor( ICollection collection, TypeConverter typeConverter )
    {
      _collection = collection;
      _typeConverter = typeConverter;
    }

    protected override IEnumerable CreateItemsSource( PropertyItem propertyItem )
    {
      return _collection;
    }

    protected override IValueConverter CreateValueConverter()
    {
      //When using a stringConverter, we need to convert the value
      if( (_typeConverter != null) && (_typeConverter is StringConverter) )
        return new SourceComboBoxEditorConverter( _typeConverter );
      return null;
    }
  }

  internal class SourceComboBoxEditorConverter : IValueConverter
  {
    private TypeConverter _typeConverter;

    internal SourceComboBoxEditorConverter( TypeConverter typeConverter )
    {
      _typeConverter = typeConverter;
    }

    public object Convert( object value, Type targetType, object parameter, CultureInfo culture )
    {
      if( _typeConverter != null )
      {
        if( _typeConverter.CanConvertTo( typeof(string) ) )
          return _typeConverter.ConvertTo( value, typeof(string) );
      }
      return value;
    }

    public object ConvertBack( object value, Type targetType, object parameter, CultureInfo culture )
    {
      if( _typeConverter != null )
      {
        if( _typeConverter.CanConvertFrom( value.GetType() ) )
          return _typeConverter.ConvertFrom( value );
      }
      return value;
    }
  }
}