// AddComponent adds a given component to this Entity
// +component+ *must* be a pointer or the system won't work.
func (self *Entity) AddComponent(component components.Component) {
self.components[component.Type()] = component
if self.entityDB != nil {
self.entityDB.ComponentAdded(self)
}
}
func (self *EntityDB) notifyListenersOfRemovedComponent(entity *Entity, component components.Component) {
for _, listenerEntry := range self.listeners {
// Find listeners who know about this Entity but no longer want this
// entity (because the entity's component map no longer matches the Listener's map)
if listenerEntry.entitySet.Contains(entity) &&
(listenerEntry.componentMap&component.Type()) > 0 {
listenerEntry.entitySet.Delete(entity)
listenerEntry.listener.TearDownEntity(entity)
}
}
}