public void IncludeTopLevelNonSpatialQueryableDesendants(IList <object> topLevelObjects)
{
var count = topLevelObjects.Count;
for (int i = 0; i < count; ++i)
{
ContainerTraverser.Traverse(topLevelObjects[i], traverser);
}
}
/// <summary>
/// Performs a depth first search and finds the first descendant object with the specified type.
/// </summary>
public T Find <T>() where T : class
{
T result = null;
ContainerTraverser.Traverse <Object>(this, desendant =>
{
result = desendant as T;
if (result != null)
{
return(TraverseOptions.Stop);
}
result = null;
return(TraverseOptions.Continue);
});
return(result);
}
/// <summary>
/// Called when a child object is removed directly from this drawing group.
/// </summary>
/// <param name="child"></param>
protected override void OnRemoved(object child)
{
++workingExpandablesDepth;
ContainerTraverser.Traverse <object>(child, InternalRemove);
if (--workingExpandablesDepth == 0)
{
var count = workingExpandables.Count;
for (var i = 0; i < count; ++i)
{
var collectionChanged = workingExpandables[i];
if (collectionChanged != null)
{
collectionChanged.Added -= OnDesecendantAdded;
collectionChanged.Removed -= OnDesecendantRemoved;
}
}
workingExpandables.Clear();
}
}
/// <summary>
/// Computes the axis aligned bounding box that exactly contains the bounds of all child node.
/// </summary>
/// <remarks>
/// Any desendant that implements <see cref="ISpatialQueryable"/> will be included in the final bounding box.
/// </remarks>
public BoundingBox ComputeBounds()
{
var hasBoundable = false;
var bounds = new BoundingBox();
ContainerTraverser.Traverse <ISpatialQueryable>(this, boundable =>
{
if (hasBoundable)
{
var childBounds = boundable.BoundingBox;
BoundingBox.CreateMerged(ref bounds, ref childBounds, out bounds);
}
else
{
bounds = boundable.BoundingBox;
hasBoundable = true;
}
return(TraverseOptions.Continue);
});
return(bounds);
}
/// <summary>
/// Performs a depth first search and finds the first descendant object with the specified name.
/// </summary>
public T FindName <T>(string name) where T : class
{
if (string.IsNullOrEmpty(name))
{
throw new ArgumentException("name");
}
T result = null;
ContainerTraverser.Traverse <Object>(this, desendant =>
{
result = desendant as T;
if (result != null)
{
if (desendant.name == name)
{
return(TraverseOptions.Stop);
}
result = null;
}
return(TraverseOptions.Continue);
});
return(result);
}
/// <summary>
/// Finds all the child objects of the target including the input target.
/// </summary>
public void Traverse <T>(Func <T, TraverseOptions> result) where T : class
{
ContainerTraverser.Traverse(this, result);
}
/// <summary>
/// Finds all the child objects of the target including the input target.
/// </summary>
public void Traverse <T>(ICollection <T> result) where T : class
{
ContainerTraverser.Traverse(this, result);
}
/// <summary>
/// Traverse up the scene tree and returns the first parent of type T.
/// Returns the target object if it is already an instance of T.
/// </summary>
public T FindParent <T>() where T : class
{
return(ContainerTraverser.FindParentContainer <T>(this));
}
/// <summary>
/// Finds the root object in the scene hierarchy.
/// </summary>
public T FindRoot <T>() where T : class
{
return(ContainerTraverser.FindRootContainer(this) as T);
}
public override void Add(ISpatialQueryable item)
{
currentItem = item;
ContainerTraverser.Traverse(item, traverser);
currentItem = null;
}