mcs/class/referencesource/System.Activities.Presentation/System.Activities.Presentation/System/Activities/Presentation/Toolbox/ActivityTemplateFactory.cs

   1 // <copyright>
   2 //   Copyright (c) Microsoft Corporation.  All rights reserved.
   3 // </copyright>
   4
   5 namespace System.Activities.Presentation.Toolbox
   6 {
   7     using System.Activities.Presentation;
   8     using System.Activities.XamlIntegration;
   9     using System.ComponentModel;
  10     using System.Reflection;
  11     using System.Runtime;
  12     using System.Windows;
  13     using System.Windows.Markup;
  14     using System.Xaml;
  15
  16     /// <summary>
  17     /// ActivityTemplateFactory is the XAML representation for an IActivityTemplateFactory. This class is for XAML serialization purpose only and is not expected to be used by developers.
  18     /// </summary>
  19     [ContentProperty("Implementation")]
  20     public abstract class ActivityTemplateFactory : IActivityTemplateFactory
  21     {
  22         /// <summary>
  23         /// Gets or sets the a factory method that create an activity as the implementation.
  24         /// </summary>
  25         [XamlDeferLoad(typeof(FuncDeferringLoader), typeof(ActivityTemplateFactory))]
  26         [DefaultValue(null)]
  27         [Browsable(false)]
  28         [Ambient]
  29         protected virtual Func<Activity> Implementation
  30         {
  31             get;
  32             set;
  33         }
  34
  35         /// <summary>
  36         /// Create an activity by calling Implementation.
  37         /// </summary>
  38         /// <param name="target">A reference to the user interface - not used.</param>
  39         /// <returns>The activity created by the implementation method or null if implementation is not set.</returns>
  40         public Activity Create(DependencyObject target)
  41         {
  42             if (this.Implementation != null)
  43             {
  44                 return this.Implementation();
  45             }
  46             else
  47             {
  48                 return null;
  49             }
  50         }
  51     }
  52 }