mcs/class/referencesource/System.Activities.Presentation/System.Activities.Presentation/System/Activities/Presentation/Model/DictionaryEditChange.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.Collections.Generic;
   9     using System.Text;
  10     using System.Activities.Presentation.Services;
  11
  12     class DictionaryEditChange : ModelChange
  13     {
  14         public ModelItemDictionary Dictionary { get; set; }
  15
  16         public ModelItem Key { get; set; }
  17
  18         public ModelItem OldValue { get; set; }
  19
  20         public ModelItem NewValue { get; set; }
  21
  22         public ModelTreeManager ModelTreeManager { get; set; }
  23
  24
  25         public override string Description
  26         {
  27             get
  28             {
  29                 return SR.DictionaryEditEditingScopeDescription;
  30             }
  31         }
  32
  33         public override bool Apply()
  34         {
  35             ModelItem oldValue = this.Dictionary[this.Key];
  36             if ((oldValue == null && this.NewValue == null) ||
  37                (oldValue != null && this.NewValue != null && oldValue.GetCurrentValue().Equals(this.NewValue.GetCurrentValue())))
  38             {
  39                 return false;
  40             }
  41
  42             ((ModelItemDictionaryImpl)this.Dictionary).EditCore(this.Key, this.NewValue);
  43
  44             ModelChangeInfo changeInfo = ModelChangeInfoImpl.CreateDictionaryValueChanged(this.Dictionary, this.Key, this.OldValue, this.NewValue);
  45
  46             if (this.OldValue != null)
  47             {
  48                 this.ModelTreeManager.modelService.OnModelItemRemoved(this.OldValue, changeInfo);
  49                 changeInfo = null;
  50             }
  51             if (this.NewValue != null)
  52             {
  53                 this.ModelTreeManager.modelService.OnModelItemAdded(this.NewValue, changeInfo);
  54             }
  55             return true;
  56         }
  57
  58
  59
  60         public override Change GetInverse()
  61         {
  62             return new DictionaryEditChange()
  63                 {
  64                     Dictionary = this.Dictionary,
  65                     Key = this.Key,
  66                     OldValue = this.NewValue,
  67                     NewValue = this.OldValue,
  68                     ModelTreeManager = this.ModelTreeManager,
  69                 };
  70         }
  71     }
  72 }