/// <summary>
/// Iterate shapes associated with a given element
/// </summary>
/// <param name="modelElement">The parent element to iterate. Can be <see langword="null"/> if <paramref name="shapeElement"/> is specified.</param>
/// <param name="shapeElement">The shape to reference. Can be <see langword="null"/> if <paramref name="modelElement"/> is specified.</param>
/// <param name="onePerDiagram">True to filter the shapes to one per diagram</param>
/// <param name="visitor">A <see cref="Predicate{ShapeElement}"/> callback.
/// Return <see langword="true"/> to continue iteration.</param>
public static void VisitAssociatedShapes(ModelElement modelElement, ShapeElement shapeElement, bool onePerDiagram, Predicate<ShapeElement> visitor)
{
if (modelElement == null && shapeElement != null)
{
modelElement = shapeElement.ModelElement;
}
if (modelElement != null)
{
LinkedElementCollection<PresentationElement> presentationElements = PresentationViewsSubject.GetPresentation(modelElement);
int pelCount = presentationElements.Count;
if (pelCount != 0)
{
List<Diagram> visitedDiagrams = null;
Diagram visitedDiagram = null;
Partition shapePartition = (shapeElement != null) ? shapeElement.Partition : modelElement.Partition;
Type thisType = (shapeElement != null) ? shapeElement.GetType() : typeof(ShapeElement);
for (int i = 0; i < pelCount; ++i)
{
PresentationElement pel = presentationElements[i];
if (shapePartition == pel.Partition && thisType.IsAssignableFrom(pel.GetType()))
{
ShapeElement sel = pel as ShapeElement;
Diagram selDiagram = sel.Diagram;
if (!onePerDiagram || (visitedDiagram != selDiagram && (visitedDiagrams == null || !visitedDiagrams.Contains(selDiagram))))
{
if (!visitor(sel))
{
return;
}
if (onePerDiagram)
{
if (visitedDiagram == null)
{
visitedDiagram = selDiagram;
}
else
{
if (visitedDiagrams == null)
{
visitedDiagrams = new List<Diagram>();
}
visitedDiagrams.Add(selDiagram);
}
}
}
}
}
}
}
}
/// <summary>
/// Determines if a the model element backing the shape element
/// is represented by a shape of the same type elsewhere in the presentation
/// layer. If a derived shape displays multiple presentations, they should
/// also override the <see cref="DisplaysMultiplePresentations"/> property.
/// </summary>
public static bool ElementHasMultiplePresentations(ShapeElement shapeElement)
{
ModelElement modelElement;
if (null != shapeElement &&
null != (modelElement = shapeElement.ModelElement))
{
LinkedElementCollection<PresentationElement> presentationElements = PresentationViewsSubject.GetPresentation(modelElement);
int pelCount = presentationElements.Count;
if (pelCount != 0)
{
Partition shapePartition = shapeElement.Partition;
Type thisType = shapeElement.GetType();
for (int i = 0; i < pelCount; ++i)
{
PresentationElement pel = presentationElements[i];
if (shapeElement != pel && shapePartition == pel.Partition && thisType.IsAssignableFrom(pel.GetType()))
{
return true;
}
}
}
}
return false;
}
