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

   1 //----------------------------------------------------------------
   2 // Copyright (c) Microsoft Corporation.  All rights reserved.
   3 //----------------------------------------------------------------
   4
   5 namespace System.Activities.Presentation.Converters
   6 {
   7     using System.Activities.Presentation.Internal.PropertyEditing.Model;
   8     using System.Activities.Presentation.Model;
   9     using System.Globalization;
  10     using System.Runtime;
  11     using System.ServiceModel.Activities;
  12     using System.Windows.Data;
  13
  14     // This type converter converts from ModelPropertyEntry to ModelItem that owns the property
  15     public class ModelPropertyEntryToOwnerActivityConverter : IValueConverter
  16     {
  17         public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
  18         {
  19             //converter can be parametrized - by default, always return parent model item of type Activity or WorkflowService,
  20             //but if false is passed in - simply return first parent
  21             bool returnParentWorkflowElement = true;
  22             if (null != parameter && parameter is bool)
  23             {
  24                 returnParentWorkflowElement = (bool)parameter;
  25             }
  26
  27             return ModelPropertyEntryToOwnerActivityConverter.Convert(value as ModelPropertyEntry, returnParentWorkflowElement);
  28         }
  29
  30         internal static ModelItem Convert(ModelPropertyEntry modelPropertyEntry, bool returnParentActivity)
  31         {
  32             ModelItem convertedValue = null;
  33             if (modelPropertyEntry != null)
  34             {
  35                 ModelProperty property = modelPropertyEntry.FirstModelProperty;
  36                 if (property != null)
  37                 {
  38                     convertedValue = property.Parent;
  39                     if (returnParentActivity)
  40                     {
  41                         while (convertedValue != null)
  42                         {
  43                             Type itemType = convertedValue.ItemType;
  44                             if (typeof(Activity).IsAssignableFrom(itemType) || typeof(WorkflowService).IsAssignableFrom(itemType))
  45                             {
  46                                 break;
  47                             }
  48
  49                             convertedValue = convertedValue.Parent;
  50                         }
  51                     }
  52                 }
  53             }
  54
  55             return convertedValue;
  56         }
  57
  58         public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
  59         {
  60             Fx.Assert("this value converter only works on the forward direction");
  61             return null;
  62         }
  63     }
  64 }