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

   1 //----------------------------------------------------------------
   2 // <copyright company="Microsoft Corporation">
   3 //     Copyright (c) Microsoft Corporation.  All rights reserved.
   4 // </copyright>
   5 //----------------------------------------------------------------
   6
   7 namespace System.Activities.Presentation.Model
   8 {
   9     using System.Xaml;
  10
  11     internal class AttachablePropertyChange : ModelChange
  12     {
  13         public ModelItem Owner { get; set; }
  14
  15         public AttachableMemberIdentifier AttachablePropertyIdentifier { get; set; }
  16
  17         public object OldValue { get; set; }
  18
  19         public object NewValue { get; set; }
  20
  21         public string PropertyName { get; set; }
  22
  23         public override string Description
  24         {
  25             get { return SR.PropertyChangeEditingScopeDescription; }
  26         }
  27
  28         public override bool Apply()
  29         {
  30             if (this.NewValue == null)
  31             {
  32                 AttachablePropertyServices.RemoveProperty(this.Owner.GetCurrentValue(), this.AttachablePropertyIdentifier);
  33             }
  34             else
  35             {
  36                 AttachablePropertyServices.SetProperty(this.Owner.GetCurrentValue(), this.AttachablePropertyIdentifier, this.NewValue);
  37             }
  38
  39             // notify observer
  40             if (!string.IsNullOrEmpty(this.PropertyName))
  41             {
  42                 ((IModelTreeItem)this.Owner).OnPropertyChanged(this.PropertyName);
  43             }
  44
  45             return true;
  46         }
  47
  48         public override Change GetInverse()
  49         {
  50             return new AttachablePropertyChange()
  51             {
  52                 Owner = this.Owner,
  53                 AttachablePropertyIdentifier = this.AttachablePropertyIdentifier,
  54                 OldValue = this.NewValue,
  55                 NewValue = this.OldValue,
  56                 PropertyName = this.PropertyName
  57             };
  58         }
  59     }
  60 }