mcs/class/referencesource/System.Activities.Presentation/System.Activities.Presentation/System/Activities/Presentation/Base/Core/Internal/PropertyEditing/Selection/CategoryContainerSelectionPathInterpreter.cs

   1 //----------------------------------------------------------------
   2 // Copyright (c) Microsoft Corporation.  All rights reserved.
   3 //----------------------------------------------------------------
   4 namespace System.Activities.Presentation.Internal.PropertyEditing.Selection
   5 {
   6     using System.Diagnostics;
   7     using System.Text;
   8     using System.Windows;
   9
  10     using System.Activities.Presentation.PropertyEditing;
  11
  12     using System.Activities.Presentation.Internal.PropertyEditing.State;
  13
  14     // <summary>
  15     // Helper class that knows how to construct and interpret SelectionPaths leading
  16     // to CategoryContainers.
  17     // </summary>
  18     internal class CategoryContainerSelectionPathInterpreter : ISelectionPathInterpreter
  19     {
  20
  21         private static CategoryContainerSelectionPathInterpreter _instance = new CategoryContainerSelectionPathInterpreter();
  22         private CategoryContainerSelectionPathInterpreter()
  23         {
  24         }
  25         public static CategoryContainerSelectionPathInterpreter Instance
  26         { get { return _instance; } }
  27
  28         public string PathTypeId
  29         { get { return "Cider_CategoryPath"; } }
  30
  31         // <summary>
  32         // Creates an instance of SelectionPath to the specified category container's
  33         // basic or advanced sections that this class knows how to interpret.
  34         // </summary>
  35         // <param name="categoryName">Name of the category</param>
  36         // <param name="isAdvanced">True if the path should lead to the advanced section,
  37         // false otherwise.</param>
  38         // <returns>A new instance of SelectionPath to the specified section of the specified
  39         // category container.</returns>
  40         public SelectionPath ConstructSelectionPath(string categoryName, bool isAdvanced)
  41         {
  42             StringBuilder path = new StringBuilder(PersistedStateUtilities.Escape(categoryName));
  43             if (isAdvanced)
  44             {
  45                 path.Append(",Advanced");
  46             }
  47
  48             return new SelectionPath(PathTypeId, path.ToString());
  49         }
  50
  51         // ISelectionPathInterpreter Members
  52
  53         public DependencyObject ResolveSelectionPath(CategoryList root, SelectionPath path, out bool pendingGeneration)
  54         {
  55             pendingGeneration = false;
  56             if (path == null || !string.Equals(PathTypeId, path.PathTypeId))
  57             {
  58                 Debug.Fail("Invalid SelectionPath specified.");
  59                 return null;
  60             }
  61
  62             if (root == null)
  63             {
  64                 Debug.Fail("No CategoryList specified.");
  65                 return null;
  66             }
  67
  68             string[] pathValues = path.Path.Split(',');
  69             string categoryName = PersistedStateUtilities.Unescape(pathValues[0]);
  70             bool isAdvanced = pathValues.Length == 2;
  71
  72             CategoryEntry category = root.FindCategory(categoryName);
  73             if (category == null)
  74             {
  75                 return null;
  76             }
  77
  78             DependencyObject categoryVisual = root.FindCategoryEntryVisual(category);
  79             if (categoryVisual == null)
  80             {
  81                 return null;
  82             }
  83
  84             DependencyObject searchStart;
  85
  86             // For basic section, start at the root.
  87             // For advanced section, start at the advanced expander.
  88             // The next SelectionStop in both cases will be the section header SelectionStop.
  89             if (!isAdvanced)
  90             {
  91                 searchStart = categoryVisual;
  92             }
  93             else
  94             {
  95                 searchStart = VisualTreeUtils.GetNamedChild<FrameworkElement>(categoryVisual, "PART_AdvancedExpander");
  96             }
  97
  98             return PropertySelection.FindNeighborSelectionStop<DependencyObject>(searchStart, SearchDirection.Next);
  99         }
 100
 101     }
 102 }