mcs/class/referencesource/System.Activities.Presentation/System.Activities.Presentation/System/Activities/Presentation/Base/Core/Internal/PropertyEditing/FromExpression/Framework/Data/BoolToVisibilityCollpasedConverter.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.ComponentModel;
   9     using System.Globalization;
  10     using System.Reflection;
  11     using System.Windows;
  12     using System.Windows.Controls;
  13     using System.Windows.Data;
  14     using System.Diagnostics.CodeAnalysis;
  15
  16     // <summary>
  17     // (bool-to-Visibility) Maps true to Visible and false to Collapsed.
  18     // </summary>
  19
  20     [SuppressMessage("Microsoft.Performance", "CA1812:AvoidUninstantiatedInternalClasses")]
  21     internal class BoolToVisibilityCollapsedConverter : IValueConverter
  22     {
  23         bool invertBoolean = false;
  24
  25         [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")]
  26         public bool InvertBoolean
  27         {
  28             get { return this.invertBoolean; }
  29             set { this.invertBoolean = value; }
  30         }
  31
  32         // IValueConverter Implementation
  33         public object ConvertBack(object o, Type targetType, object parameter, CultureInfo culture)
  34         {
  35             Visibility visibility = (Visibility)o;
  36             return ((visibility == Visibility.Visible) ^ this.invertBoolean);
  37         }
  38
  39         public object Convert(object o, Type targetType, object parameter, CultureInfo culture)
  40         {
  41             Visibility result = Visibility.Collapsed;
  42
  43             if (o is Nullable<bool>)
  44             {
  45                 if ((((Nullable<bool>)o).Value) ^ this.invertBoolean)
  46                 {
  47                     result = Visibility.Visible;
  48                 }
  49             }
  50             else if (o is bool)
  51             {
  52                 if (((bool)o) ^ this.invertBoolean)
  53                 {
  54                     result = Visibility.Visible;
  55                 }
  56             }
  57             return result;
  58         }
  59     }
  60
  61 }