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

   1 //----------------------------------------------------------------
   2 // Copyright (c) Microsoft Corporation.  All rights reserved.
   3 //----------------------------------------------------------------
   4
   5 namespace System.Activities.Presentation.View
   6 {
   7     using System.Activities.Presentation.Model;
   8     using System.Collections.Generic;
   9
  10     public abstract class ViewStateService
  11     {
  12         public abstract event ViewStateChangedEventHandler ViewStateChanged;
  13         public abstract event ViewStateChangedEventHandler UndoableViewStateChanged;
  14         public abstract object RetrieveViewState(ModelItem modelItem, string key);
  15         public abstract void StoreViewState(ModelItem modelItem, string key, object value);
  16         public abstract void StoreViewStateWithUndo(ModelItem modelItem, string key, object value);
  17         public abstract Dictionary<string, object> RetrieveAllViewState(ModelItem modelItem);
  18         public abstract bool RemoveViewState(ModelItem modelItem, string key);
  19     }
  20 }