mcs/class/referencesource/System.Activities.Presentation/System.Activities.Presentation/System/Activities/Presentation/Base/Core/Internal/PropertyEditing/FromExpression/Framework/Data/DelegateCommand.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.Windows.Input;
   9     using System.Diagnostics.CodeAnalysis;
  10     using System.Runtime;
  11
  12     internal sealed class DelegateCommand : ICommand
  13     {
  14         private SimpleEventHandler handler;
  15         private bool isEnabled = true;
  16
  17         public DelegateCommand(SimpleEventHandler handler)
  18         {
  19             this.handler = handler;
  20         }
  21
  22
  23         public event EventHandler CanExecuteChanged;
  24
  25         public bool IsEnabled
  26         {
  27             get { return this.isEnabled; }
  28         }
  29         void ICommand.Execute(object arg)
  30         {
  31             this.handler();
  32         }
  33
  34         bool ICommand.CanExecute(object arg)
  35         {
  36             return this.IsEnabled;
  37         }
  38
  39         [SuppressMessage(FxCop.Category.Performance, FxCop.Rule.AvoidUncalledPrivateCode, Justification = "This is required by the ICommand interface.")]
  40         private void OnCanExecuteChanged()
  41         {
  42             if (this.CanExecuteChanged != null)
  43             {
  44                 this.CanExecuteChanged(this, EventArgs.Empty);
  45             }
  46         }
  47         public delegate void SimpleEventHandler();
  48     }
  49 }