mcs/class/referencesource/System.Activities.Presentation/System.Activities.Presentation/System/Activities/Presentation/Converters/ObjectToModelValueConverter.cs

   1 //----------------------------------------------------------------
   2 // Copyright (c) Microsoft Corporation.  All rights reserved.
   3 //----------------------------------------------------------------
   4
   5 namespace System.Activities.Presentation.Converters
   6 {
   7     using System.Diagnostics;
   8     using System.Globalization;
   9     using System.Windows.Data;
  10     using System.Activities.Presentation.Model;
  11     using System.Activities.Presentation.Internal.PropertyEditing.Model;
  12
  13     //This value converter is used in propertygrid scenarios to convert an object into a ModelItem.
  14     //It converts from ModelPropertyEntry to ModelItem that owns the property
  15     //The first binding is a two way binding with the PropertyValue object
  16     //The second binding is a one way binding with the ModelPropertyEntry.
  17     public class ObjectToModelValueConverter : IMultiValueConverter
  18     {
  19
  20         public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
  21         {
  22             ModelItem convertedValue = null;
  23             if (values[1] != null)
  24             {
  25                 ModelPropertyEntry modelPropertyEntry = values[1] as ModelPropertyEntry;
  26                 if (modelPropertyEntry != null)
  27                 {
  28                     ModelProperty property = modelPropertyEntry.FirstModelProperty;
  29                     if (property != null)
  30                     {
  31                         convertedValue = property.Value;
  32                     }
  33                 }
  34             }
  35             return convertedValue;
  36         }
  37
  38         public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
  39         {
  40             object[] returnValue = new object[] { null };
  41             if (value != null)
  42             {
  43                 returnValue[0] = ((ModelItem)value).GetCurrentValue();
  44             }
  45             return returnValue;
  46         }
  47     }
  48 }