mcs/class/referencesource/System.Activities.Presentation/System.Activities.Presentation/System/Activities/Presentation/Base/Core/Internal/PropertyEditing/Editors/ValueToToolTipConverter.cs

   1 //----------------------------------------------------------------
   2 // Copyright (c) Microsoft Corporation.  All rights reserved.
   3 //----------------------------------------------------------------
   4 namespace System.Activities.Presentation.Internal.PropertyEditing.Editors
   5 {
   6     using System;
   7     using System.Diagnostics;
   8     using System.Diagnostics.CodeAnalysis;
   9     using System.Globalization;
  10     using System.Windows.Data;
  11     using System.Runtime;
  12     using System.Activities.Presentation;
  13
  14     // <summary>
  15     // A converter that takes a value of a property and a boolean indicating whether it
  16     // is being edited and returns a string to use for the editor tool tip.
  17     // This class gets instantiated from XAML.
  18     // </summary>
  19     [SuppressMessage("Microsoft.Performance", "CA1812:AvoidUninstantiatedInternalClasses")]
  20     internal class ValueToToolTipConverter : IMultiValueConverter
  21     {
  22         public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture) {
  23             Fx.Assert(values != null && values.Length == 2, "Invalid values passed into ValueToToolTipConverter");
  24
  25             bool isEditing = (bool)values[1];
  26             string value = isEditing ? null : EditorUtilities.GetDisplayName(values[0]);
  27
  28             return string.IsNullOrEmpty(value) ? null : value;
  29         }
  30
  31         public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture) {
  32             throw FxTrace.Exception.AsError(new NotImplementedException());
  33         }
  34     }
  35 }