public void Update(T item, Vector2r previous, Vector2r current)
{
// update the stored item
for (int i = 0; i < _items.Length; ++i)
{
if (ReferenceEquals(_items[i].Item, item))
{
_items[i].Position = current;
break;
}
}
// update the monitors
for (int i = 0; i < _monitors.Length; ++i)
{
StoredMonitor monitor = _monitors[i];
bool containedPrevious = monitor.Region.Contains(previous);
bool containedCurrent = monitor.Region.Contains(current);
// the monitor was previously interested but no longer is
if (containedPrevious && containedCurrent == false)
{
monitor.Monitor.OnExit(item);
}
// the monitor was not previous interested but now is
else if (containedPrevious == false && containedCurrent)
{
monitor.Monitor.OnEnter(item);
}
}
}
public void Add(T item, Vector2r position)
{
_items.Add(new StoredItem(item, position));
// call OnEnter for all monitors that are interested in the item
for (int i = 0; i < _monitors.Length; ++i)
{
StoredMonitor monitor = _monitors[i];
if (monitor.Region.Contains(position))
{
monitor.Monitor.OnEnter(item);
}
}
}
public void Remove(T item, Vector2r position)
{
// remove the stored item
for (int i = 0; i < _items.Length; ++i)
{
if (ReferenceEquals(_items[i].Item, item))
{
_items.Remove(i);
break;
}
}
// call OnExit for all monitors that were previously interested in the item
for (int i = 0; i < _monitors.Length; ++i)
{
StoredMonitor monitor = _monitors[i];
if (monitor.Region.Contains(position))
{
monitor.Monitor.OnExit(item);
}
}
}
