internal void AddDrawable(DrawableBase item)
{
if(item == null)
throw new ArgumentNullException();
if(Items.Contains(item))
throw new ArgumentException();
Items.Add(item);
DrawEngine2d.SetRenderRequired();
}
internal void AddUser(String key, DrawableBase user)
{
if(String.IsNullOrWhiteSpace(key))
throw new ArgumentNullException();
if(user == null)
throw new ArgumentNullException();
if(!Users.ContainsKey(key))
throw new ArgumentException("Attempt to add a user to an unknown key.");
if(Users[key] == null)
Users[key] = new List<DrawableBase>();
if(Users[key].Contains(user))
throw new ArgumentException("Attempt to register a duplicate user.");
Users[key].Add(user);
}
internal void RemoveUser(String key, DrawableBase user)
{
if(String.IsNullOrWhiteSpace(key))
throw new ArgumentNullException();
if(user == null)
throw new ArgumentNullException();
if(!Users.ContainsKey(key))
throw new ArgumentException("Attempt to remove a user from an unknown key.");
if(Users[key] == null)
throw new ArgumentException("Attempt to remove an unknown user.");
if(!Users[key].Contains(user))
throw new ArgumentException("Attempt to remove an unknown user.");
Users[key].Remove(user);
//Let the cache policy decide what to do.
ApplyCachePolicyForRemovalOfUser(key);
}
