// Attach and detach for Colleague registration
public void Attach(MediatorColleague mc)
{
// Before we add, need to check to see if other MC's need updating.
// This is a key part of the SnapViewDirector "mediator" role - to coordinate its Colleagues.
updateExistingMC(mc);
mcList.AddLast(mc);
}
public void Detach(MediatorColleague mc)
{
// Before we detach, need to update other MC's (e.g., a removed Constraint invalidates stat MC's)
// This is a key part of the SnapViewDirector "mediator" role - to coordinate its Colleagues.
updateExistingMC(mc);
mcList.Remove(mc);
// Need exception for trying to remove something that isn't there
}
// Update existing MC's depending on what is about to be attached
void updateExistingMC(MediatorColleague mc_change)
{
// If this is a filter or constraint - every MC gets set to "inValid" (subject to local overrides)
// [Note: I may well end up putting every MC type in here - in which case change it]
if (mc_change is FilterMC || mc_change is ConstraintMC)
{
foreach (MediatorColleague mc_other in mcList)
{
mc_other.isValid = false;
}
}
}