mcs/class/referencesource/System.Activities.Presentation/System.Activities.Presentation/System/Activities/Presentation/Model/DictionaryChange.cs

   1 //----------------------------------------------------------------
   2 // Copyright (c) Microsoft Corporation.  All rights reserved.
   3 //----------------------------------------------------------------
   4
   5 namespace System.Activities.Presentation.Model
   6 {
   7     using System;
   8     using System.Activities.Presentation.Services;
   9     using System.Collections.Generic;
  10     using System.Runtime;
  11     using System.Text;
  12
  13     class DictionaryChange : ModelChange
  14     {
  15         public ModelItemDictionary Dictionary { get; set; }
  16
  17         public OperationType Operation { get; set; }
  18
  19         public ModelItem Key { get; set; }
  20
  21         public ModelItem Value { get; set; }
  22
  23         public ModelTreeManager ModelTreeManager { get; set; }
  24
  25         public override string Description
  26         {
  27             get
  28             {
  29                 return this.Operation == OperationType.Insert ? SR.DictionaryAddEditingScopeDescription : SR.DictionaryRemoveEditingScopeDescription;
  30             }
  31         }
  32
  33         public override bool Apply()
  34         {
  35             switch (this.Operation)
  36             {
  37                 case OperationType.Insert:
  38                     ApplyInsert();
  39                     break;
  40                 case OperationType.Delete:
  41                     ApplyDelete();
  42                     break;
  43                 default:
  44                     Fx.Assert("Operation should be Insert or Delete");
  45                     break;
  46             }
  47             return true;
  48         }
  49
  50         private void ApplyDelete()
  51         {
  52             ((ModelItemDictionaryImpl)this.Dictionary).RemoveCore(this.Key);
  53
  54             ModelChangeInfo changeInfo = ModelChangeInfoImpl.CreateDictionaryKeyValueRemoved(this.Dictionary, this.Key, this.Value);
  55
  56             if (this.Key != null)
  57             {
  58                 this.ModelTreeManager.modelService.OnModelItemRemoved(this.Key, changeInfo);
  59                 changeInfo = null;
  60             }
  61
  62             if (this.Value != null)
  63             {
  64                 this.ModelTreeManager.modelService.OnModelItemRemoved(this.Value, changeInfo);
  65                 changeInfo = null;
  66             }
  67
  68             if (changeInfo != null)
  69             {
  70                 this.ModelTreeManager.modelService.EmitModelChangeInfo(changeInfo);
  71             }
  72         }
  73
  74         private void ApplyInsert()
  75         {
  76             ((ModelItemDictionaryImpl)this.Dictionary).AddCore(this.Key, this.Value);
  77
  78             ModelChangeInfo changeInfo = ModelChangeInfoImpl.CreateDictionaryKeyValueAdded(this.Dictionary, this.Key, this.Value);
  79
  80             if (this.Key != null)
  81             {
  82                 this.ModelTreeManager.modelService.OnModelItemAdded(this.Key, changeInfo);
  83                 changeInfo = null;
  84             }
  85
  86             if (this.Value != null)
  87             {
  88                 this.ModelTreeManager.modelService.OnModelItemAdded(this.Value, changeInfo);
  89                 changeInfo = null;
  90             }
  91
  92             if (changeInfo != null)
  93             {
  94                 this.ModelTreeManager.modelService.EmitModelChangeInfo(changeInfo);
  95             }
  96         }
  97
  98         public override Change GetInverse()
  99         {
 100             OperationType reverseOperation = this.Operation == OperationType.Insert ? OperationType.Delete : OperationType.Insert;
 101             return new DictionaryChange()
 102                 {
 103                     Dictionary = this.Dictionary,
 104                     Operation = reverseOperation,
 105                     Key = this.Key,
 106                     Value = this.Value,
 107                     ModelTreeManager = this.ModelTreeManager,
 108                 };
 109         }
 110
 111         public enum OperationType
 112         {
 113             Insert, Delete
 114         }
 115     }
 116 }