mcs/class/referencesource/System.Activities.Presentation/System.Activities.Presentation/System/Activities/Presentation/Base/Core/Internal/PropertyEditing/State/PropertyActiveEditModeStateContainer.cs

   1 //----------------------------------------------------------------
   2 // Copyright (c) Microsoft Corporation.  All rights reserved.
   3 //----------------------------------------------------------------
   4 namespace System.Activities.Presentation.Internal.PropertyEditing.State
   5 {
   6     using System.Collections;
   7     using System.Text;
   8     using System.Activities.Presentation.PropertyEditing;
   9     using System.Activities.Presentation.Internal.PropertyEditing.Model;
  10
  11     // <summary>
  12     // Container storing the names of properties the value editors of which
  13     // are in ExtendedPinned ActiveEditMode.  We persist this information
  14     // across domain reloads and view changes.
  15     // </summary>
  16     internal class PropertyActiveEditModeStateContainer : IStateContainer
  17     {
  18
  19         public static readonly PropertyActiveEditModeStateContainer Instance = new PropertyActiveEditModeStateContainer();
  20
  21         private Hashtable _expandedPropertyEditors = new Hashtable();
  22         private PropertyActiveEditModeStateContainer()
  23         {
  24         }
  25
  26         // <summary>
  27         // Gets the last stored ActiveEditMode for the specified property
  28         // </summary>
  29         // <param name="property">PropertyEntry to look up</param>
  30         // <returns>Last stored ActiveEditMode for the specified property</returns>
  31         public PropertyContainerEditMode GetActiveEditMode(PropertyEntry property)
  32         {
  33             return _expandedPropertyEditors.ContainsKey(ModelUtilities.GetCachedSubPropertyHierarchyPath(property)) ?
  34                 PropertyContainerEditMode.ExtendedPinned :
  35                 PropertyContainerEditMode.Inline;
  36         }
  37
  38         // <summary>
  39         // Stores the current ActiveEditMode for the specified property
  40         // </summary>
  41         // <param name="property">Property to key off of</param>
  42         // <param name="editMode">ActiveEditMode value to store</param>
  43         public void StoreActiveEditMode(PropertyEntry property, PropertyContainerEditMode editMode)
  44         {
  45             string path = ModelUtilities.GetCachedSubPropertyHierarchyPath(property);
  46
  47             // We only care about storing the ExtendedPinned state.  Everything
  48             // else is transitory and shouldn't be persisted.
  49             //
  50             if (editMode == PropertyContainerEditMode.ExtendedPinned)
  51             {
  52                 _expandedPropertyEditors[path] = null;
  53             }
  54             else
  55             {
  56                 _expandedPropertyEditors.Remove(path);
  57             }
  58         }
  59
  60         // IStateContainer
  61
  62         public object RetrieveState()
  63         {
  64             if (_expandedPropertyEditors.Count == 0)
  65             {
  66                 return null;
  67             }
  68
  69             bool firstTime = true;
  70             StringBuilder sb = new StringBuilder();
  71             foreach (string propertyPath in _expandedPropertyEditors)
  72             {
  73                 sb.Append(propertyPath);
  74                 if (!firstTime)
  75                 {
  76                     sb.Append(';');
  77                 }
  78                 firstTime = false;
  79             }
  80
  81             return sb.ToString();
  82         }
  83
  84         public void RestoreState(object state)
  85         {
  86             string stateString = state as string;
  87             if (stateString == null)
  88             {
  89                 return;
  90             }
  91
  92             string[] paths = stateString.Split(';');
  93             foreach (string path in paths)
  94             {
  95                 if (string.IsNullOrEmpty(path))
  96                 {
  97                     continue;
  98                 }
  99                 _expandedPropertyEditors[path] = null;
 100             }
 101         }
 102
 103     }
 104 }