//添加活动
public static ModelItem AddActivity(this ModelItem modelItem, object item, int index = -1)
{
if (!modelItem.CanAddItem(item))
{
return(null);
}
ModelItem result = null;
Activity value;
if (modelItem.IsSequence() && (value = (item as Activity)) != null)
{
ModelItemCollection collection = modelItem.Properties["Activities"].Collection;
result = ((index == -1) ? collection.Add(value) : collection.Insert(index, value));
}
else if (modelItem.IsFlowchart())
{
FlowNode flowNode = null;
if (item != null)
{
FlowNode flowNode2;
if ((flowNode2 = (item as FlowNode)) == null)
{
Activity activity;
if ((activity = (item as Activity)) != null)
{
Activity action = activity;
flowNode = new FlowStep
{
Action = action
};
}
}
else
{
FlowNode flowNode3 = flowNode2;
flowNode = flowNode3;
}
}
if (flowNode != null)
{
ModelItemCollection collection2 = modelItem.Properties["Nodes"].Collection;
result = ((index == -1) ? collection2.Add(flowNode) : collection2.Insert(index, flowNode));
}
}
else if (modelItem.IsStateMachine() && (item is State || item is FinalState))
{
State state = (item as State) ?? new State
{
IsFinal = true,
};
ModelItemCollection collection3 = modelItem.Properties["States"].Collection;
result = ((index == -1) ? collection3.Add(state) : collection3.Insert(index, state));
}
return(result);
}
