private void Entity_ComponentChanged(object sender, NotifyCollectionChangedEventArgs e)
{
Entity entity = (Entity)sender;
switch (e.Action)
{
case NotifyCollectionChangedAction.Add:
break;
case NotifyCollectionChangedAction.Move:
break;
case NotifyCollectionChangedAction.Remove:
if (!ComponentTypes.All(entity.Has))
{
Remove(entity);
}
break;
case NotifyCollectionChangedAction.Replace:
break;
case NotifyCollectionChangedAction.Reset:
Remove(entity);
break;
default:
throw new ArgumentOutOfRangeException();
}
}
/// <summary>
/// Tries the add.
/// </summary>
/// <param name="entity">The entity.</param>
public void TryAdd(Entity entity)
{
if (Entities.Contains(entity))
{
return;
}
if (!ComponentTypes.All(entity.Has))
{
return;
}
entity.CollectionChanged += Entity_ComponentChanged;
Entities.Add(entity);
OnEntityAdded(entity);
}
public void OnEntityComponentAdded(ComponentAddedEvent args)
{
var originalComponentTypes = args.Entity.Components.Select(x => x.GetType()).ToList();
originalComponentTypes.Remove(args.Component.GetType());
var previouslyMatched = ComponentTypes.All(x => originalComponentTypes.Contains(x));
if (previouslyMatched)
{
return;
}
var newComponentMatches = ComponentTypes.Contains(args.Component.GetType());
if (newComponentMatches)
{
OnEntityAdded.OnNext(args.Entity);
}
}
/// <summary>
/// Determins whether an entity has the required component types specified by the processor.
/// </summary>
/// <param name="entity"></param>
/// <returns></returns>
public bool Matches(Entity entity)
{
return(ComponentTypes.All(t => entity.Components.ContainsKey(t)));
}