protected override void OnHeaderChanged(object oldHeader, object newHeader)
{
base.OnHeaderChanged(oldHeader, newHeader);
TreeViewItemViewModel source = newHeader as TreeViewItemViewModel;
if (source != null)
{
source.TreeViewItem = this;
}
}
internal ModelProperty GetTrackingModelPropertyForChild(TreeViewItemViewModel child)
{
ModelProperty property = null;
foreach (ChangeNotificationTracker tracker in this.Trackers.Values)
{
if (tracker.ChildViewModels.Contains(child))
{
property = tracker.ParentProperty;
break;
}
}
return(property);
}
internal override void LoadChildren()
{
if (this.PerfEventProvider != null)
{
this.PerfEventProvider.DesignerTreeViewLoadChildrenStart();
}
base.LoadChildren();
TreeViewItemViewModel.AddModelItem(this, this.Value, null);
if (this.PerfEventProvider != null)
{
this.PerfEventProvider.DesignerTreeViewLoadChildrenEnd();
}
}
internal ChangeNotificationTracker GetTracker(TreeViewItemViewModel child)
{
ChangeNotificationTracker trackerForChild = null;
foreach (ChangeNotificationTracker tracker in this.Trackers.Values)
{
if (tracker.ChildViewModels.Contains(child))
{
trackerForChild = tracker;
break;
}
}
Fx.Assert(trackerForChild != null, "Tracker should not be null");
return(trackerForChild);
}
public ChangeNotificationTracker(TreeViewItemViewModel parent, ModelProperty parentProperty)
{
if (parent == null)
{
throw FxTrace.Exception.AsError(new ArgumentNullException("parent"));
}
if (parentProperty == null)
{
throw FxTrace.Exception.AsError(new ArgumentNullException("parentProperty"));
}
this.Parent = parent;
this.ParentProperty = parentProperty;
this.TrackedModelItem = new Dictionary<ModelItem, HashSet<string>>();
this.TrackedCollection = new List<INotifyCollectionChanged>();
this.ChildViewModels = new List<TreeViewItemViewModel>();
}
internal static void AddModelItem(TreeViewItemViewModel parent, ModelItem item, ModelProperty trackingProperty)
{
if (item != null)
{
bool updateTrackingProperty = trackingProperty == null;
foreach (ModelProperty property in item.Properties)
{
if (updateTrackingProperty)
{
trackingProperty = property;
}
AddModelProperty(parent, item, trackingProperty, property);
}
}
}
internal Dictionary <string, string> GetAutomationItemStatus()
{
Dictionary <string, string> itemStatus = new Dictionary <string, string>();
TreeViewItemViewModel viewModel = this.Header as TreeViewItemViewModel;
if (viewModel != null && viewModel.IsHighlighted)
{
itemStatus.Add("IsSelection", "True");
}
else
{
itemStatus.Add("IsSelection", "False");
}
return(itemStatus);
}
public ChangeNotificationTracker(TreeViewItemViewModel parent, ModelProperty parentProperty)
{
if (parent == null)
{
throw FxTrace.Exception.AsError(new ArgumentNullException("parent"));
}
if (parentProperty == null)
{
throw FxTrace.Exception.AsError(new ArgumentNullException("parentProperty"));
}
this.Parent = parent;
this.ParentProperty = parentProperty;
this.TrackedModelItem = new Dictionary <ModelItem, HashSet <string> >();
this.TrackedCollection = new List <INotifyCollectionChanged>();
this.ChildViewModels = new List <TreeViewItemViewModel>();
}
public TreeViewItemModelPropertyViewModel(TreeViewItemViewModel parent, ModelProperty property)
: base(parent)
{
Fx.Assert(property != null, "property cannot be null");
this.Value = property;
this.VisualValue = property;
if (property != null && property.Parent != null)
{
this.GetTracker(property);
}
this.UpdateState();
if (this.HasChildren)
{
this.InternalChildren.Add(TreeViewItemViewModel.DummyNode);
}
}
internal static TreeViewItemViewModel CreateViewModel(TreeViewItemViewModel parent, object value)
{
TreeViewItemViewModel viewModel = null;
if (typeof(ModelItem).IsAssignableFrom(value.GetType()))
{
viewModel = new TreeViewItemModelItemViewModel(parent, value as ModelItem);
}
else if (typeof(ModelProperty).IsAssignableFrom(value.GetType()))
{
viewModel = new TreeViewItemModelPropertyViewModel(parent, value as ModelProperty);
}
else if (typeof(KeyValuePair <ModelItem, ModelItem>).IsAssignableFrom(value.GetType()))
{
viewModel = new TreeViewItemKeyValuePairModelItemViewModel(parent, (KeyValuePair <ModelItem, ModelItem>)value);
}
return(viewModel);
}
internal override void UpdateChildren(ChangeNotificationTracker tracker, EventArgs e)
{
if (this.PerfEventProvider != null)
{
this.PerfEventProvider.DesignerTreeViewUpdateStart();
}
base.UpdateChildren(tracker, e);
tracker.CleanUp();
if (this.Value.Value != null)
{
this.AddChild(TreeViewItemViewModel.CreateViewModel(this, this.Value.Value), tracker.ParentProperty);
}
if (this.PerfEventProvider != null)
{
this.PerfEventProvider.DesignerTreeViewUpdateEnd();
}
}
internal static void AddModelItemCollection(TreeViewItemViewModel parent, ModelItemCollection collection, ModelProperty trackingProperty)
{
parent.GetTracker(trackingProperty).AddCollection(collection);
bool duplicatedNodeVisible = true;
string childNodePrefix = string.Empty;
ShowPropertyInOutlineViewAttribute viewChild = ExtensibilityAccessor.GetAttribute <ShowPropertyInOutlineViewAttribute>(trackingProperty);
if (viewChild != null)
{
duplicatedNodeVisible = viewChild.DuplicatedChildNodesVisible;
childNodePrefix = viewChild.ChildNodePrefix;
}
foreach (ModelItem item in collection)
{
AddChild(parent, item, item, duplicatedNodeVisible, childNodePrefix, trackingProperty);
}
}
internal override void LoadChildren()
{
if (this.PerfEventProvider != null)
{
this.PerfEventProvider.DesignerTreeViewLoadChildrenStart();
}
base.LoadChildren();
if (this.Value.Value != null)
{
ChangeNotificationTracker tracker = this.Parent.GetTracker(this);
this.AddChild(TreeViewItemViewModel.CreateViewModel(this, this.Value.Value), tracker.ParentProperty);
}
if (this.PerfEventProvider != null)
{
this.PerfEventProvider.DesignerTreeViewLoadChildrenEnd();
}
}
public TreeViewItemModelItemViewModel(TreeViewItemViewModel parent, ModelItem modelItem, bool lazyLoad)
: base(parent)
{
this.Value = modelItem;
ShowInOutlineViewAttribute attr = ExtensibilityAccessor.GetAttribute <ShowInOutlineViewAttribute>(modelItem);
if (attr != null && !string.IsNullOrEmpty(attr.PromotedProperty))
{
// Only consider one level of promoted property.
this.promotedProperty = modelItem.Properties[attr.PromotedProperty];
if (this.promotedProperty != null)
{
this.VisualValue = this.promotedProperty.Value;
}
else
{
// is this what we really want?
Fx.Assert(attr.PromotedProperty + " not found on " + modelItem.Name);
this.VisualValue = null;
}
}
else
{
this.VisualValue = modelItem;
}
IsHighlighted = Selection.IsSelection(this.VisualValue);
if (lazyLoad)
{
this.UpdateState();
if (this.HasChildren)
{
this.InternalChildren.Add(TreeViewItemViewModel.DummyNode);
}
}
else
{
this.LoadChildren();
}
}
internal static void AddModelItemDictionary(TreeViewItemViewModel parent, ModelItemDictionary dictionary, ModelProperty trackingProperty)
{
parent.GetTracker(trackingProperty).AddCollection(dictionary);
bool duplicatedNodeVisible = true;
string childNodePrefix = string.Empty;
ShowPropertyInOutlineViewAttribute viewChild = ExtensibilityAccessor.GetAttribute <ShowPropertyInOutlineViewAttribute>(trackingProperty);
if (viewChild != null)
{
duplicatedNodeVisible = viewChild.DuplicatedChildNodesVisible;
childNodePrefix = viewChild.ChildNodePrefix;
}
foreach (var pair in dictionary)
{
ModelItem item = null;
//AddChild(parent, pair.Value, pair, duplicatedNodeVisible, trackingProperty);
AddChild(parent, item, pair, duplicatedNodeVisible, childNodePrefix, trackingProperty);
}
}
//if child is null then only add the modelProperty for tracking purpose
internal virtual void AddChild(TreeViewItemViewModel child, ModelProperty modelProperty)
{
//check for duplicate first
if (child != null)
{
object childValue = child.GetValue();
if (!ChildrenValueCache.Contains(childValue))
{
ChildrenValueCache.Add(childValue);
}
else
{
child.CleanUp();
return;
}
}
ChangeNotificationTracker tracker = GetTracker(modelProperty);
if (child != null)
{
// May be adding a node before it's expanded; get rid of the dummy
if (this.Children.Count == 1 && this.Children[0] == DummyNode)
{
this.InternalChildren.Remove(DummyNode);
}
int insertIndex = this.FindInsertionIndex(tracker);
this.InternalChildren.Insert(insertIndex, child);
tracker.ChildViewModels.Add(child);
if (child.HasSibling)
{
//loading children rather than just add the sibling of the children
//if this turn out to be a big performance impact then we'll need to optimise this
child.LoadChildren();
}
}
}
protected override void OnUnselected(RoutedEventArgs e)
{
base.OnUnselected(e);
if (shouldUpdateViewModel)
{
TreeViewItemViewModel viewModel = this.Header as TreeViewItemViewModel;
if (viewModel != null)
{
if (viewModel is TreeViewItemModelPropertyViewModel || viewModel is TreeViewItemKeyValuePairModelItemViewModel)
{
viewModel.IsHighlighted = false;
}
else if (viewModel is TreeViewItemModelItemViewModel)
{
TreeViewItemModelItemViewModel modelItemViewModel = (TreeViewItemModelItemViewModel)viewModel;
if (!modelItemViewModel.HasDesigner)
{
modelItemViewModel.IsHighlighted = false;
}
}
}
}
}
internal static void AddModelProperty(TreeViewItemViewModel parent, ModelItem item, ModelProperty trackingProperty, ModelProperty property)
{
//in the case of multiple attributes, they go in this order
//HidePropertyInOutlineViewAttribute
//[item.ShowInOutlineViewAttribute.PromotedProperty = property.Name]. Set VisualValue by property and ignore itself. Usage ActivityDelegate, FlowStep.
//ShowPropertyInOutlineViewAttribute
//ShowPropertyInOutlineViewAsSiblingAttribute
//ShowInOutlineViewAttribute
ShowPropertyInOutlineViewAttribute viewChild = ExtensibilityAccessor.GetAttribute <ShowPropertyInOutlineViewAttribute>(property);
if (ExtensibilityAccessor.GetAttribute <HidePropertyInOutlineViewAttribute>(property) != null)
{
//ignore
return;
}
else if (IsPromotedProperty(item, property))
{
if (property.IsCollection)
{
ModelItemCollection mc = property.Value as ModelItemCollection;
AddModelItemCollection(parent, mc, trackingProperty);
}
else if (property.IsDictionary)
{
ModelItemDictionary dictionary = property.Dictionary;
AddModelItemDictionary(parent, dictionary, trackingProperty);
}
else
{
parent.GetTracker(trackingProperty).Add(item, property);
//if property.Value is null, then this would not add any node
// Use promoted ModelItem's property to track, so pass null to AddModelItem method.
AddModelItem(parent, property.Value, null);
}
}
else if (viewChild != null)
{
if (viewChild.CurrentPropertyVisible) //property node visible
{
if (property.Value != null)
{
TreeViewItemViewModel childModel = TreeViewItemViewModel.CreateViewModel(parent, property);
childModel.DuplicatedNodeVisible = viewChild.DuplicatedChildNodesVisible;
parent.AddChild(childModel, trackingProperty);
}
else
{
//just add the notification tracker without adding the empty child
parent.GetTracker(trackingProperty, true).Add(item, trackingProperty);
}
}
else
{
if (property.IsCollection)
{
ModelItemCollection mc = property.Value as ModelItemCollection;
AddModelItemCollection(parent, mc, trackingProperty);
}
else if (property.IsDictionary)
{
ModelItemDictionary dictionary = property.Dictionary;
AddModelItemDictionary(parent, dictionary, trackingProperty);
}
else
{
if (property.Value != null)
{
TreeViewItemViewModel childModel = TreeViewItemViewModel.CreateViewModel(parent, property.Value);
childModel.DuplicatedNodeVisible = viewChild.DuplicatedChildNodesVisible;
parent.AddChild(childModel, trackingProperty);
}
else
{
parent.GetTracker(trackingProperty).Add(item, property);
}
}
}
}
else if (ExtensibilityAccessor.GetAttribute <ShowPropertyInOutlineViewAsSiblingAttribute>(property) != null)
{
//add notification to the tracker that is responsible for this node
ChangeNotificationTracker tracker = parent.Parent.GetTracker(parent);
tracker.Add(item, property);
TreeViewItemViewModel siblingNode = null;
if (property.Value != null)
{
siblingNode = TreeViewItemViewModel.CreateViewModel(parent.Parent, property.Value);
}
parent.Parent.AddChild(siblingNode, tracker.ParentProperty);
}
else if (ExtensibilityAccessor.GetAttribute <ShowInOutlineViewAttribute>(property) != null)
{
if (property.Value != null)
{
ShowInOutlineViewAttribute outlineView = ExtensibilityAccessor.GetAttribute <ShowInOutlineViewAttribute>(property);
if (string.IsNullOrWhiteSpace(outlineView.PromotedProperty))
{
parent.AddChild(TreeViewItemViewModel.CreateViewModel(parent, property), trackingProperty);
}
else
{
ModelProperty promotedProperty = property.Value.Properties.Find(outlineView.PromotedProperty);
if (promotedProperty == null)
{
throw FxTrace.Exception.AsError(new InvalidOperationException(string.Format(CultureInfo.CurrentCulture, SR.PromotedPropertyNotFound, outlineView.PromotedProperty, property.Value.Name)));
}
// Add promoted ModelItem and property into tracker. So when property got changed, the grandparent of promoted ModelItem will be notified.
ChangeNotificationTracker tracker = parent.GetTracker(trackingProperty, true);
tracker.Add(property.Value, promotedProperty);
if (promotedProperty.Value == null)
{
tracker.Add(item, property);
}
else
{
parent.AddChild(TreeViewItemViewModel.CreateViewModel(parent, property), trackingProperty);
}
}
}
else
{
parent.GetTracker(trackingProperty, true).Add(item, property);
}
}
//if the values in the dictionary is viewvisible, note this only works with generic dictionary
else if (property.IsDictionary && property.PropertyType.IsGenericType)
{
Type[] arguments = property.PropertyType.GetGenericArguments();
if (ExtensibilityAccessor.GetAttribute <ShowInOutlineViewAttribute>(arguments[1]) != null)
{
if (property.Value != null)
{
parent.AddChild(TreeViewItemViewModel.CreateViewModel(parent, property), trackingProperty);
}
else
{
parent.GetTracker(trackingProperty, true).Add(item, property);
}
}
}
}
public TreeViewItemModelItemViewModel(TreeViewItemViewModel parent, ModelItem modelItem)
: this(parent, modelItem, true)
{
}
private void HighlightTreeViewItemAndClearSelectionOnDesigner(TreeViewItemViewModel viewModel)
{
this.ParentTreeView.Context.Items.SetValue(new Selection());
viewModel.IsHighlighted = true;
}
//if child is null then only add the modelProperty for tracking purpose
internal virtual void AddChild(TreeViewItemViewModel child, ModelProperty modelProperty)
{
//check for duplicate first
if (child != null)
{
object childValue = child.GetValue();
if (!ChildrenValueCache.Contains(childValue))
{
ChildrenValueCache.Add(childValue);
}
else
{
child.CleanUp();
return;
}
}
ChangeNotificationTracker tracker = GetTracker(modelProperty);
if (child != null)
{
// May be adding a node before it's expanded; get rid of the dummy
if (this.Children.Count == 1 && this.Children[0] == DummyNode)
{
this.InternalChildren.Remove(DummyNode);
}
int insertIndex = this.FindInsertionIndex(tracker);
this.InternalChildren.Insert(insertIndex, child);
tracker.ChildViewModels.Add(child);
if (child.HasSibling)
{
//loading children rather than just add the sibling of the children
//if this turn out to be a big performance impact then we'll need to optimise this
child.LoadChildren();
}
}
}
internal static void AddModelItem(TreeViewItemViewModel parent, ModelItem item, ModelProperty trackingProperty)
{
if (item != null)
{
bool updateTrackingProperty = trackingProperty == null;
foreach (ModelProperty property in item.Properties)
{
if (updateTrackingProperty)
{
trackingProperty = property;
}
AddModelProperty(parent, item, trackingProperty, property);
}
}
}
internal static TreeViewItemViewModel CreateViewModel(TreeViewItemViewModel parent, object value)
{
TreeViewItemViewModel viewModel = null;
if (typeof(ModelItem).IsAssignableFrom(value.GetType()))
{
viewModel = new TreeViewItemModelItemViewModel(parent, value as ModelItem);
}
else if (typeof(ModelProperty).IsAssignableFrom(value.GetType()))
{
viewModel = new TreeViewItemModelPropertyViewModel(parent, value as ModelProperty);
}
else if (typeof(KeyValuePair<ModelItem, ModelItem>).IsAssignableFrom(value.GetType()))
{
viewModel = new TreeViewItemKeyValuePairModelItemViewModel(parent, (KeyValuePair<ModelItem, ModelItem>)value);
}
return viewModel;
}
internal static void AddModelItemCollection(TreeViewItemViewModel parent, ModelItemCollection collection, ModelProperty trackingProperty)
{
parent.GetTracker(trackingProperty).AddCollection(collection);
bool duplicatedNodeVisible = true;
string childNodePrefix = string.Empty;
ShowPropertyInOutlineViewAttribute viewChild = ExtensibilityAccessor.GetAttribute<ShowPropertyInOutlineViewAttribute>(trackingProperty);
if (viewChild != null)
{
duplicatedNodeVisible = viewChild.DuplicatedChildNodesVisible;
childNodePrefix = viewChild.ChildNodePrefix;
}
foreach (ModelItem item in collection)
{
AddChild(parent, item, item, duplicatedNodeVisible, childNodePrefix, trackingProperty);
}
}
internal ModelProperty GetTrackingModelPropertyForChild(TreeViewItemViewModel child)
{
ModelProperty property = null;
foreach (ChangeNotificationTracker tracker in this.Trackers.Values)
{
if (tracker.ChildViewModels.Contains(child))
{
property = tracker.ParentProperty;
break;
}
}
return property;
}
private void HighlightTreeViewItemAndClearSelectionOnDesigner(TreeViewItemViewModel viewModel)
{
this.ParentTreeView.Context.Items.SetValue(new Selection());
viewModel.IsHighlighted = true;
}
internal static void AddModelItemDictionary(TreeViewItemViewModel parent, ModelItemDictionary dictionary, ModelProperty trackingProperty)
{
parent.GetTracker(trackingProperty).AddCollection(dictionary);
bool duplicatedNodeVisible = true;
string childNodePrefix = string.Empty;
ShowPropertyInOutlineViewAttribute viewChild = ExtensibilityAccessor.GetAttribute<ShowPropertyInOutlineViewAttribute>(trackingProperty);
if (viewChild != null)
{
duplicatedNodeVisible = viewChild.DuplicatedChildNodesVisible;
childNodePrefix = viewChild.ChildNodePrefix;
}
foreach (var pair in dictionary)
{
ModelItem item = null;
//AddChild(parent, pair.Value, pair, duplicatedNodeVisible, trackingProperty);
AddChild(parent, item, pair, duplicatedNodeVisible, childNodePrefix, trackingProperty);
}
}
internal static void AddModelProperty(TreeViewItemViewModel parent, ModelItem item, ModelProperty trackingProperty, ModelProperty property)
{
//in the case of multiple attributes, they go in this order
//HidePropertyInOutlineViewAttribute
//[item.ShowInOutlineViewAttribute.PromotedProperty = property.Name]. Set VisualValue by property and ignore itself. Usage ActivityDelegate, FlowStep.
//ShowPropertyInOutlineViewAttribute
//ShowPropertyInOutlineViewAsSiblingAttribute
//ShowInOutlineViewAttribute
ShowPropertyInOutlineViewAttribute viewChild = ExtensibilityAccessor.GetAttribute<ShowPropertyInOutlineViewAttribute>(property);
if (ExtensibilityAccessor.GetAttribute<HidePropertyInOutlineViewAttribute>(property) != null)
{
//ignore
return;
}
else if (IsPromotedProperty(item, property))
{
if (property.IsCollection)
{
ModelItemCollection mc = property.Value as ModelItemCollection;
AddModelItemCollection(parent, mc, trackingProperty);
}
else if (property.IsDictionary)
{
ModelItemDictionary dictionary = property.Dictionary;
AddModelItemDictionary(parent, dictionary, trackingProperty);
}
else
{
parent.GetTracker(trackingProperty).Add(item, property);
//if property.Value is null, then this would not add any node
// Use promoted ModelItem's property to track, so pass null to AddModelItem method.
AddModelItem(parent, property.Value, null);
}
}
else if (viewChild != null)
{
if (viewChild.CurrentPropertyVisible) //property node visible
{
if (property.Value != null)
{
TreeViewItemViewModel childModel = TreeViewItemViewModel.CreateViewModel(parent, property);
childModel.DuplicatedNodeVisible = viewChild.DuplicatedChildNodesVisible;
parent.AddChild(childModel, trackingProperty);
}
else
{
//just add the notification tracker without adding the empty child
parent.GetTracker(trackingProperty, true).Add(item, trackingProperty);
}
}
else
{
if (property.IsCollection)
{
ModelItemCollection mc = property.Value as ModelItemCollection;
AddModelItemCollection(parent, mc, trackingProperty);
}
else if (property.IsDictionary)
{
ModelItemDictionary dictionary = property.Dictionary;
AddModelItemDictionary(parent, dictionary, trackingProperty);
}
else
{
if (property.Value != null)
{
TreeViewItemViewModel childModel = TreeViewItemViewModel.CreateViewModel(parent, property.Value);
childModel.DuplicatedNodeVisible = viewChild.DuplicatedChildNodesVisible;
parent.AddChild(childModel, trackingProperty);
}
else
{
parent.GetTracker(trackingProperty).Add(item, property);
}
}
}
}
else if (ExtensibilityAccessor.GetAttribute<ShowPropertyInOutlineViewAsSiblingAttribute>(property) != null)
{
//add notification to the tracker that is responsible for this node
ChangeNotificationTracker tracker = parent.Parent.GetTracker(parent);
tracker.Add(item, property);
TreeViewItemViewModel siblingNode = null;
if (property.Value != null)
{
siblingNode = TreeViewItemViewModel.CreateViewModel(parent.Parent, property.Value);
}
parent.Parent.AddChild(siblingNode, tracker.ParentProperty);
}
else if (ExtensibilityAccessor.GetAttribute<ShowInOutlineViewAttribute>(property) != null)
{
if (property.Value != null)
{
ShowInOutlineViewAttribute outlineView = ExtensibilityAccessor.GetAttribute<ShowInOutlineViewAttribute>(property);
if (string.IsNullOrWhiteSpace(outlineView.PromotedProperty))
{
parent.AddChild(TreeViewItemViewModel.CreateViewModel(parent, property), trackingProperty);
}
else
{
ModelProperty promotedProperty = property.Value.Properties.Find(outlineView.PromotedProperty);
if (promotedProperty == null)
{
throw FxTrace.Exception.AsError(new InvalidOperationException(string.Format(CultureInfo.CurrentCulture, SR.PromotedPropertyNotFound, outlineView.PromotedProperty, property.Value.Name)));
}
// Add promoted ModelItem and property into tracker. So when property got changed, the grandparent of promoted ModelItem will be notified.
ChangeNotificationTracker tracker = parent.GetTracker(trackingProperty, true);
tracker.Add(property.Value, promotedProperty);
if (promotedProperty.Value == null)
{
tracker.Add(item, property);
}
else
{
parent.AddChild(TreeViewItemViewModel.CreateViewModel(parent, property), trackingProperty);
}
}
}
else
{
parent.GetTracker(trackingProperty, true).Add(item, property);
}
}
//if the values in the dictionary is viewvisible, note this only works with generic dictionary
else if (property.IsDictionary && property.PropertyType.IsGenericType)
{
Type[] arguments = property.PropertyType.GetGenericArguments();
if (ExtensibilityAccessor.GetAttribute<ShowInOutlineViewAttribute>(arguments[1]) != null)
{
if (property.Value != null)
{
parent.AddChild(TreeViewItemViewModel.CreateViewModel(parent, property), trackingProperty);
}
else
{
parent.GetTracker(trackingProperty, true).Add(item, property);
}
}
}
}
internal static void AddChild(TreeViewItemViewModel parent, ModelItem item, object value, bool duplicatedNodeVisible, string childNodePrefix, ModelProperty trackingProperty)
{
// If necessary, evaluate uniqueness of given item
bool isUnique = false;
if (!duplicatedNodeVisible)
{
// Note: These evaluations expect item to be an immediate child of trackingProperty.Value
// Intermediate nodes would for example undermine simple check just below
//
// Caveat 1: Aim is to greatly reduce, not to eliminate, display of nodes visible elsewhere
// Caveat 1a: Nodes reachable from other isolated nodes are included in the collection
// Caveat 1b: Nodes that are not isolated may be reachable from isolated nodes and thus
// displayed together with the isolated ones; ShowPropertyInOutlineViewAsSiblingAttribute may make this seem normal
// (If complete duplicate elimination were the aim, would likely need a "never expand"
// display mode for duplicateNodeVisible=false children)
// Caveat 2: Use of single uniqueChildren field may cause all children of a second
// duplcatedNodeVisible=false property to be ignored if (fortunately only if) neither
// property uses ShowPropertyInOutlineViewAttribute(true) -- that attribute's default
// Caveat 3-n: Please see caveats described at top of UniqueModelItemHelper
if (1 >= item.Parents.Count())
{
isUnique = true;
}
else
{
// Avoided a thorough evaluation as long as we can
if (null == parent.uniqueChildren)
{
parent.uniqueChildren = UniqueModelItemHelper.FindUniqueChildren(trackingProperty);
}
isUnique = parent.uniqueChildren.Contains(item);
}
}
// If displayable now, create the view model node
if (duplicatedNodeVisible || isUnique)
{
TreeViewItemViewModel child = TreeViewItemViewModel.CreateViewModel(parent, value);
child.NodePrefixText = childNodePrefix;
parent.AddChild(child, trackingProperty);
}
// Track for potential addition or removal of parents even if not presently visible
if (!duplicatedNodeVisible)
{
ModelItemImpl itemImpl = item as ModelItemImpl;
if (null != itemImpl)
{
ChangeNotificationTracker tracker = parent.GetTracker(trackingProperty);
tracker.AddCollection(itemImpl.InternalParents);
tracker.AddCollection(itemImpl.InternalSources);
}
}
}
internal ChangeNotificationTracker GetTracker(TreeViewItemViewModel child)
{
ChangeNotificationTracker trackerForChild = null;
foreach (ChangeNotificationTracker tracker in this.Trackers.Values)
{
if (tracker.ChildViewModels.Contains(child))
{
trackerForChild = tracker;
break;
}
}
Fx.Assert(trackerForChild != null, "Tracker should not be null");
return trackerForChild;
}