/// <summary>
/// DeleteRule: typeof(DiagramDisplayHasDiagramOrder), FireTime=LocalCommit, Priority=FrameworkDomainModel.BeforeDelayValidateRulePriority;
/// Make sure that deletion of a diagram order results in a reorder
/// </summary>
private static void DiagramOrderDeletedRule(ElementDeletedEventArgs e)
{
DiagramDisplayHasDiagramOrder link = (DiagramDisplayHasDiagramOrder)e.ModelElement;
Diagram diagram = link.Diagram;
if (!diagram.IsDeleted)
{
Store store = diagram.Store;
if (diagram.Partition == store.DefaultPartition) // This should never happen, but it is easy to check
{
if (null == DiagramDisplayHasDiagramOrder.GetDiagramDisplay(diagram))
{
DiagramDisplay displayContainer = link.DiagramDisplay;
if (displayContainer.IsDeleted)
{
ReadOnlyCollection <DiagramDisplay> displays = store.ElementDirectory.FindElements <DiagramDisplay>(false);
displayContainer = (displays.Count != 0) ? displays[0] : new DiagramDisplay(store);
}
new DiagramDisplayHasDiagramOrder(displayContainer, diagram);
}
}
}
else
{
DiagramDisplay displayContainer = link.DiagramDisplay;
if (!displayContainer.IsDeleted && displayContainer.OrderedDiagramCollection.Count == 0)
{
// No more diagrams, don't need the container
displayContainer.Delete();
}
}
}
/// <summary>
/// Process diagram items to make sure they have a current ordering representation
/// </summary>
protected sealed override void ProcessElement(Diagram element, Store store, INotifyElementAdded notifyAdded)
{
DiagramDisplayHasDiagramOrder link = DiagramDisplayHasDiagramOrder.GetLinkToDiagramDisplay(element);
DiagramDisplay container = myDiagramDisplay;
if (container == null)
{
if (link != null)
{
container = link.DiagramDisplay;
}
// Make sure we only have one container, use the one we've already grabbed
ReadOnlyCollection <DiagramDisplay> containers = store.ElementDirectory.FindElements <DiagramDisplay>(false);
int containerCount = containers.Count;
for (int i = containerCount - 1; i >= 0; --i)
{
DiagramDisplay testContainer = containers[i];
if (container != null)
{
if (testContainer != container)
{
testContainer.Delete();
}
}
else if (i == 0)
{
container = testContainer;
}
else
{
testContainer.Delete();
}
}
if (container == null)
{
container = new DiagramDisplay(store);
notifyAdded.ElementAdded(container, false);
}
myDiagramDisplay = container;
if (link != null)
{
// There is nothing else to do, the element has been validated
if (link.IsActiveDiagram)
{
if (mySeenActive)
{
link.IsActiveDiagram = false;
}
else
{
mySeenActive = true;
}
}
return;
}
}
if (link == null)
{
// This will add to the end of the existing collection
link = new DiagramDisplayHasDiagramOrder(container, element);
notifyAdded.ElementAdded(link, false);
}
else
{
if (link.DiagramDisplay != container)
{
link.DiagramDisplay = container;
}
if (link.IsActiveDiagram)
{
if (mySeenActive)
{
link.IsActiveDiagram = false;
}
else
{
mySeenActive = true;
}
}
}
}
