public static bool IsItemInSequence(this ModelItem item, out ModelItem sequence)
{
if (null == item)
{
throw FxTrace.Exception.AsError(new ArgumentNullException("item"));
}
bool result = false;
int level = 0;
Func <ModelItem, bool> isInSequencePredicate = (p) =>
{
switch (level)
{
case 0:
++level;
return(p is ModelItemCollection);
case 1:
++level;
result = typeof(Sequence).IsAssignableFrom(p.ItemType);
return(result);
default:
return(false);
}
;
};
ModelItem container = item.GetParentEnumerator(isInSequencePredicate).LastOrDefault();
sequence = result ? container : null;
return(result);
}
public static bool IsItemInFlowchart(this ModelItem item, out ModelItem flowchart, out ModelItem flowStep)
{
if (null == item)
{
throw FxTrace.Exception.AsError(new ArgumentNullException("item"));
}
bool result = false;
int level = 0;
ModelItem flowStepContainer = null;
flowchart = null;
flowStep = null;
Func <ModelItem, bool> isInFlowchartPredicate = (p) =>
{
switch (level)
{
case 0:
++level;
flowStepContainer = typeof(FlowStep).IsAssignableFrom(p.ItemType) ? p : null;
return(null != flowStepContainer);
case 1:
++level;
return(p is ModelItemCollection);
case 2:
++level;
result = (typeof(Flowchart).IsAssignableFrom(p.ItemType));
return(result);
default:
return(false);
}
};
ModelItem container = item.GetParentEnumerator(isInFlowchartPredicate).LastOrDefault();
if (result)
{
flowchart = container;
flowStep = flowStepContainer;
}
return(result);
}