public void OnEntityComponentRemoved(ComponentRemovedEvent args)
{
var originalComponents = args.Entity.Components.Select(x => x.GetType()).ToList();
originalComponents.Add(args.Component.GetType());
var matchesGroup = originalComponents.All(x => ComponentTypes.Contains(x));
if (matchesGroup)
{
OnEntityRemoved.OnNext(args.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);
}
}