mcs/class/referencesource/System.Activities.Presentation/System.Activities.Presentation/System/Activities/Presentation/Base/Core/Internal/PropertyEditing/Editors/NonZeroToBoolConverter.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.Collections;
   8     using System.Diagnostics;
   9     using System.Diagnostics.CodeAnalysis;
  10     using System.Globalization;
  11     using System.Windows.Data;
  12     using System.Activities.Presentation;
  13
  14     // <summary>
  15     // Converts ints >0 to true, everything else to false.  This class is instantiated from XAML.
  16     // </summary>
  17     [SuppressMessage("Microsoft.Performance", "CA1812:AvoidUninstantiatedInternalClasses")]
  18     internal class NonZeroToBoolConverter : IValueConverter
  19     {
  20
  21         private bool _invert;
  22
  23         // <summary>
  24         // If set to false, NonZeroToBoolConverter.Convert() converts 0 to false and !0 to true.
  25         // If set to true, the result is inverted.
  26         // </summary>
  27         [SuppressMessage("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")]
  28         public bool Invert
  29         {
  30             get { return _invert; }
  31             set { _invert = value; }
  32         }
  33
  34         public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
  35         {
  36             if (targetType == typeof(bool) && value is int)
  37             {
  38                 return (((int)value) > 0) ^ _invert;
  39             }
  40
  41             return false;
  42         }
  43
  44         public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
  45         {
  46             throw FxTrace.Exception.AsError(new NotImplementedException());
  47         }
  48     }
  49 }