mcs/class/referencesource/System.Activities.Presentation/System.Activities.Presentation/System/Activities/Presentation/Annotations/WorkflowAnnotationAdornerService.cs

   1 //----------------------------------------------------------------
   2 // <copyright company="Microsoft Corporation">
   3 //     Copyright (c) Microsoft Corporation.  All rights reserved.
   4 // </copyright>
   5 //----------------------------------------------------------------
   6
   7 namespace System.Activities.Presentation.Annotations
   8 {
   9     using System.Activities.Presentation.Model;
  10     using System.Windows.Controls;
  11     using System.Windows.Documents;
  12     using System.Xaml;
  13
  14     internal class WorkflowAnnotationAdornerService : AnnotationAdornerService
  15     {
  16         private ScrollViewer scrollViewer;
  17         private bool enabled;
  18
  19         internal WorkflowAnnotationAdornerService()
  20         {
  21         }
  22
  23         public override void Show(AnnotationAdorner adorner)
  24         {
  25             if (!this.enabled)
  26             {
  27                 return;
  28             }
  29
  30             AnnotationAdorner.SetAnchor(adorner, AdornerLocation.None);
  31             adorner.ScrollViewer = this.scrollViewer;
  32
  33             AdornerLayer adornerLayer = AdornerLayer.GetAdornerLayer(adorner.AdornedElement);
  34             if (adornerLayer != null)
  35             {
  36                 adornerLayer.Add(adorner);
  37             }
  38
  39             return;
  40         }
  41
  42         public override void Hide(AnnotationAdorner adorner)
  43         {
  44             if (!this.enabled)
  45             {
  46                 return;
  47             }
  48
  49             AnnotationAdorner.SetAnchor(adorner, AdornerLocation.None);
  50
  51             AdornerLayer adornerLayer = AdornerLayer.GetAdornerLayer(adorner.AdornedElement);
  52             if (adornerLayer != null)
  53             {
  54                 adornerLayer.Remove(adorner);
  55             }
  56
  57             return;
  58         }
  59
  60         internal void Initialize(EditingContext editingContext, ScrollViewer scrollViewer)
  61         {
  62             this.scrollViewer = scrollViewer;
  63             this.enabled = editingContext.Services.GetService<DesignerConfigurationService>().AnnotationEnabled;
  64
  65             if (!this.enabled)
  66             {
  67                 return;
  68             }
  69
  70             AttachedPropertiesService attachedPropertiesService = editingContext.Services.GetService<AttachedPropertiesService>();
  71             AttachedProperty<string> attachedProperty = new AttachedProperty<string>
  72             {
  73                 IsBrowsable = false,
  74                 IsVisibleToModelItem = true,
  75                 Name = Annotation.AnnotationTextPropertyName,
  76                 OwnerType = typeof(object),
  77                 Getter = (modelItem) =>
  78                 {
  79                     string annotation = null;
  80                     AttachablePropertyServices.TryGetProperty<string>(modelItem.GetCurrentValue(), Annotation.AnnotationTextProperty, out annotation);
  81                     return annotation;
  82                 },
  83                 Setter = (modelItem, value) =>
  84                 {
  85                     string oldValue = null;
  86                     AttachablePropertyServices.TryGetProperty<string>(modelItem.GetCurrentValue(), Annotation.AnnotationTextProperty, out oldValue);
  87                     if (oldValue == value)
  88                     {
  89                         return;
  90                     }
  91
  92                     ModelTreeManager treeManager = modelItem.GetEditingContext().Services.GetService<ModelTreeManager>();
  93
  94                     AttachablePropertyChange change = new AttachablePropertyChange()
  95                     {
  96                         Owner = modelItem,
  97                         AttachablePropertyIdentifier = Annotation.AnnotationTextProperty,
  98                         OldValue = oldValue,
  99                         NewValue = value,
 100                         PropertyName = Annotation.AnnotationTextPropertyName
 101                     };
 102
 103                     treeManager.AddToCurrentEditingScope(change);
 104                 }
 105             };
 106
 107             attachedPropertiesService.AddProperty(attachedProperty);
 108         }
 109     }
 110 }