/// <summary>
/// Called on copy, cut or drag.
/// For a copy or cut, the supplied elements are the model elements, and the call comes, via AddGroupFormat, from ClipboardCommands.ProcessOnMenuCopy().
/// For a drag operation, the elements are the selected shapes and connectors, and the call comes from Diagram.DoDragDrop, if CanMove or CanCopy are true.
/// In the drag case, we want to add the model elements so that we can do a copy
/// if the user presses CTRL while dragging.
///
/// See http://msdn.microsoft.com/library/ff521398.aspx
/// </summary>
/// <param name="shapeOrModelElements">The shape or model elements being copied - usually the current selection.</param>
/// <param name="closureType">Copy or Delete</param>
/// <returns>Group to be stored in the clipboard.</returns>
protected override ElementGroup CreateElementGroup(ICollection <ModelElement> shapeOrModelElements, ClosureType closureType)
{
// CreateElementGroup respects the settings of PropagateCopy.
// Notice that we have set PropagateCopy on the roles from components to the terminals,
// so that terminals will always be copied along with their parents.
// Add the specified group of shapes or elements:
ElementGroup group = base.CreateElementGroup(shapeOrModelElements, closureType);
// If this a set of shapes, add their model elements:
if (shapeOrModelElements.FirstOrDefault() is PresentationElement)
{
// Get the model elements of the shapes:
ICollection <ModelElement> modelElements =
shapeOrModelElements.OfType <PresentationElement>()
// Filter out shapes such as labels that don't have model elements:
.Where(pel => pel.ModelElement != null)
.Select(pel => pel.ModelElement).ToList();
ElementGroup melGroup = base.CreateElementGroup(modelElements, closureType);
group.AddRange(melGroup.GetElements());
}
return(group);
// 2011-03-21 Thanks to Joeul in VMSDK Forum for a bug fix here.
// http://social.msdn.microsoft.com/Forums/en-US/dslvsarchx/thread/0b0b16d4-6014-4b35-9e5a-e27ea02e0ee3
}
