private void SnappedEdgesOnCollectionChanged(object sender, NotifyCollectionChangedEventArgs notifyCollectionChangedEventArgs)
{
if (notifyCollectionChangedEventArgs.Action == NotifyCollectionChangedAction.Remove)
{
foreach (Edge removedEdge in notifyCollectionChangedEventArgs.OldItems)
{
var adorner = EdgeAdorners[removedEdge];
DesignSurface.RemoveAdorner(adorner);
EdgeAdorners.Remove(removedEdge);
}
}
if (notifyCollectionChangedEventArgs.Action == NotifyCollectionChangedAction.Add)
{
foreach (Edge addedEdge in notifyCollectionChangedEventArgs.NewItems)
{
var edgeAdorner = ServiceLocator.UIElementFactory.CreateEdgeAdorner(DesignSurface, WrappedSelectedItems, addedEdge);
EdgeAdorners.Add(addedEdge, edgeAdorner);
DesignSurface.AddAdorner(edgeAdorner);
}
}
if (notifyCollectionChangedEventArgs.Action == NotifyCollectionChangedAction.Reset)
{
foreach (var adorner in EdgeAdorners.Values)
{
DesignSurface.RemoveAdorner(adorner);
}
EdgeAdorners.Clear();
}
}
private void AddSelectionAdorner(ICanvasItem canvasItem)
{
var selectionAdorner = ServiceLocator.UIElementFactory.CreateSelectionAdorner(DesignSurface, canvasItem);
DesignSurface.AddAdorner(selectionAdorner);
SelectionAdorners.Add(canvasItem, selectionAdorner);
}