//TODO : this stuff seems too complex. Make it look simler.
private void Functions_CollectionChanged(object sender, NotifyCollectionChangingEventArgs e)
{
var function = (IFunction)e.Item;
switch (e.Action)
{
case NotifyCollectionChangeAction.Add:
FunctionValues.Add(null);
/* Get the components of a function. Not of variables */
if (!(function is IVariable))
{
foreach (IVariable component in function.Components)
{
if (Functions.Contains(component))
{
continue;
}
Functions.Add(component);
}
}
foreach (IVariable argument in function.Arguments)
{
if (argument.Store != this)
{
if (Functions.Contains(argument))
{
continue;
}
Functions.Add(argument);
}
}
if (function is IVariable)
{
var variable = (IVariable)function;
var variableValues = variable.FixedSize == 0 ? null : variable.Values;
// avoid unnecessary calls for better performance
var array = (variableValues == null || variableValues.Count == 0)
? variable.CreateStorageArray()
: variable.CreateStorageArray(variable.Values);
FunctionValues[e.Index] = array;
variable.CachedValues = array;
SubscribeToArray(array);
// register all variables which for the newly added is an argument
IEnumerable <IFunction> dependendFunctions =
functions.Where(f => f.Arguments.Contains(variable) && f is IVariable);
foreach (IVariable dependentVariable in dependendFunctions)
{
//DependentVariables[variable].Add(dependentVariable);
UpdateVariableSize(dependentVariable);
}
}
function.Store = this;
break;
case NotifyCollectionChangeAction.Remove:
IMultiDimensionalArray multiDimensionalArray = FunctionValues[e.Index];
UnsubscribeFromArray(multiDimensionalArray);
FunctionValues.RemoveAt(e.Index);
//evict the function from the store. Reset arguments and components list to prevent synchronization.
function.Arguments = new EventedList <IVariable>();
function.Components = new EventedList <IVariable>();
function.Store = null;
//IFunctionStore newStore = new MemoryFunctionStore();
//newStore.Functions.Add(function);
break;
case NotifyCollectionChangeAction.Replace:
throw new NotSupportedException();
}
UpdateAutoSortOnArrays();
UpdateDependentVariables();
}