mcs/class/referencesource/System.Activities.Presentation/System.Activities.Presentation/System/Activities/Presentation/Base/Core/Internal/PropertyEditing/FromExpression/Framework/Data/IntegerToVisibilityConverter.cs

   1 // -------------------------------------------------------------------
   2 // Copyright (c) Microsoft Corporation. All Rights Reserved.
   3 // -------------------------------------------------------------------
   4 //From \\authoring\Sparkle\Source\1.0.1083.0\Common\Source\Framework\Data
   5 namespace System.Activities.Presentation.Internal.PropertyEditing.FromExpression.Framework.Data
   6 {
   7     using System;
   8     using System.Collections;
   9     using System.ComponentModel;
  10     using System.Globalization;
  11     using System.Reflection;
  12     using System.Windows;
  13     using System.Windows.Controls;
  14     using System.Windows.Data;
  15     using System.Diagnostics.CodeAnalysis;
  16     using System.Runtime;
  17
  18     // <summary>
  19     // Maps an Integer to Visilbity. 0 becomes Hidden, non-zero becomes Visible.
  20     // </summary>
  21     [SuppressMessage("Microsoft.Performance", "CA1812:AvoidUninstantiatedInternalClasses")]
  22     internal class IntegerToVisibilityConverter : IValueConverter
  23     {
  24         private Visibility zeroValue = Visibility.Collapsed;
  25
  26         private Visibility nonzeroValue = Visibility.Visible;
  27         [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")]
  28         public Visibility ZeroValue
  29         {
  30             get { return this.zeroValue; }
  31             set { this.zeroValue = value; }
  32         }
  33         [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")]
  34         public Visibility NonzeroValue
  35         {
  36             get { return this.nonzeroValue; }
  37             set { this.nonzeroValue = value; }
  38         }
  39
  40         // IValueConverter Implementation
  41
  42         public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
  43         {
  44             Fx.Assert(false, "Never expecting the inverse transform to be called");
  45             return null;
  46         }
  47
  48         public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
  49         {
  50             Fx.Assert(value is int, "Ensure that transformed value is an integer");
  51
  52             if ((value is int) && (int)value == 0)
  53             {
  54                 return this.zeroValue;
  55             }
  56             else
  57             {
  58                 return this.nonzeroValue;
  59             }
  60         }
  61     }
  62 }