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

   1 //----------------------------------------------------------------
   2 // Copyright (c) Microsoft Corporation.  All rights reserved.
   3 //----------------------------------------------------------------
   4 namespace System.Activities.Presentation.Internal.PropertyEditing.State
   5 {
   6     using System;
   7     using System.Diagnostics;
   8
   9     // <summary>
  10     // Aggregate of IStateContainer objects
  11     // </summary>
  12     internal class AggregateStateContainer : IStateContainer
  13     {
  14
  15         private IStateContainer[] _containers;
  16
  17         public AggregateStateContainer(params IStateContainer[] containers) {
  18             _containers = containers;
  19         }
  20
  21         public object RetrieveState()
  22         {
  23             object[] states = null;
  24
  25             if (_containers != null)
  26             {
  27                 states = new object[_containers.Length];
  28                 for (int i = 0; i < _containers.Length; i++)
  29                 {
  30                     states[i] = _containers[i] == null ? null : _containers[i].RetrieveState();
  31                 }
  32             }
  33
  34             return states;
  35         }
  36
  37         public void RestoreState(object state)
  38         {
  39             if (_containers != null)
  40             {
  41
  42                 object[] states = state as object[];
  43                 if (states == null || states.Length != _containers.Length)
  44                 {
  45                     Debug.Fail("Invalid state to restore: " + (state == null ? "null" : state.ToString()));
  46                     return;
  47                 }
  48
  49                 for (int i = 0; i < _containers.Length; i++)
  50                 {
  51                     if (_containers[i] != null)
  52                     {
  53                         _containers[i].RestoreState(states[i]);
  54                     }
  55                 }
  56             }
  57         }
  58     }
  59 }