mcs/class/referencesource/System.Activities.Presentation/System.Activities.Presentation/System/Activities/Presentation/View/ImportedNamespaceContextItem.cs

   1 //----------------------------------------------------------------
   2 // Copyright (c) Microsoft Corporation.  All rights reserved.
   3 //----------------------------------------------------------------
   4
   5 namespace System.Activities.Presentation.Hosting
   6 {
   7     using System;
   8     using System.Runtime;
   9     using System.Collections.ObjectModel;
  10     using System.Activities.Presentation.Services;
  11     using System.Activities.Presentation.Model;
  12
  13
  14     [Fx.Tag.XamlVisible(false)]
  15     public sealed class ImportedNamespaceContextItem : ContextItem
  16     {
  17         bool initialized = false;
  18         Collection<string> importedNamespaces;
  19
  20         public Collection<string> ImportedNamespaces
  21         {
  22             get
  23             {
  24                 if (this.importedNamespaces == null)
  25                 {
  26                     initialized = true;
  27                     this.importedNamespaces = new Collection<string>();
  28                 }
  29                 return this.importedNamespaces;
  30             }
  31         }
  32
  33         public override Type ItemType
  34         {
  35             get { return typeof(ImportedNamespaceContextItem); }
  36         }
  37
  38         public void EnsureInitialized(EditingContext context)
  39         {
  40             if (!initialized)
  41             {
  42                 ModelService modelService = context.Services.GetService<ModelService>();
  43                 Fx.Assert(modelService != null, "ModelService shouldn't be null in EditingContext.");
  44                 Fx.Assert(modelService.Root != null, "model must have a root");
  45                 ModelItemCollection importsModelItem = modelService.Root.Properties[NamespaceListPropertyDescriptor.ImportCollectionPropertyName].Collection;
  46                 Fx.Assert(importsModelItem != null, "root must have imports");
  47                 foreach (ModelItem import in importsModelItem)
  48                 {
  49                     this.ImportedNamespaces.Add(import.Properties[NamespaceListPropertyDescriptor.NamespacePropertyName].ComputedValue as string);
  50                 }
  51             }
  52         }
  53     }
  54 }