mcs/class/referencesource/System.Activities.Presentation/System.Activities.Presentation/System/Activities/Presentation/View/PropertyEntryToEditorOptionConverter.cs

   1 //----------------------------------------------------------------
   2 // Copyright (c) Microsoft Corporation.  All rights reserved.
   3 //----------------------------------------------------------------
   4
   5 namespace System.Activities.Presentation.View
   6 {
   7     using System;
   8     using System.Collections.Generic;
   9     using System.Diagnostics.CodeAnalysis;
  10     using System.Globalization;
  11     using System.Reflection;
  12     using System.Windows.Data;
  13     using System.Activities.Presentation.Model;
  14     using System.Activities.Presentation.PropertyEditing;
  15     using System.Activities.Presentation.Internal.PropertyEditing.Model;
  16     using System.Runtime;
  17
  18     sealed class PropertyEntryToEditorOptionConverter : IValueConverter
  19     {
  20         public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
  21         {
  22             PropertyEntry propertyEntry = value as PropertyEntry;
  23             if (null == propertyEntry)
  24             {
  25                 PropertyValue propertyValue = value as PropertyValue;
  26                 if (null != propertyValue)
  27                 {
  28                     propertyEntry = propertyValue.ParentProperty;
  29                 }
  30             }
  31
  32             ModelPropertyEntry modelPropertyEntry = propertyEntry as ModelPropertyEntry;
  33
  34             ModelProperty modelProperty = null;
  35             if (modelPropertyEntry != null)
  36             {
  37                 modelProperty = modelPropertyEntry.FirstModelProperty;
  38             }
  39
  40             if (modelProperty == null)
  41             {
  42                 return Binding.DoNothing;
  43             }
  44
  45             string optionName = parameter as string;
  46             if (optionName == null)
  47             {
  48                 return Binding.DoNothing;
  49             }
  50
  51             object optionValue;
  52             if (EditorOptionAttribute.TryGetOptionValue(modelProperty.Attributes, optionName, out optionValue))
  53             {
  54                 return optionValue;
  55             }
  56
  57             return Binding.DoNothing;
  58         }
  59
  60         public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
  61         {
  62             // It is simply impossible to convert back.
  63             throw FxTrace.Exception.AsError(new NotSupportedException());
  64         }
  65     }
  66 }