Disconnect signal that connected from script

Question

I connected signal when a scene is instantiated.

# AsteroidSpawner.gd
func spawn_asteroid():
    var asteroid_instance = asteroid_scene.instance()
    asteroid_instance.connect("destroy", self, "handle_asteroid_destroy")
    add_child(asteroid_instance)
func handle_asteroid_destroy():
    ... # TO SOME STUFFS WHEN ASTEROID DESTROYED...
    ... # How to disconnect this handler from here?

But the problem is, I want to disconnect handleasteroiddestroy handler when object destroyed(or will destroy, use queue_free). How do I disconnect signal on specific object? Is Godot Engine will free the handler automatically?

Answer 1

you'll need to save a reference to the asteroid in your AsteroidSpawner

var asteroid_instance

func spawn_asteroid():
    asteroid_instance = asteroid_scene.instance()
    asteroid_instance.connect("destroy", self, "handle_asteroid_destroy")
    add_child(asteroid_instance)

but then its as simple as calling .disconnect() with the exact same params called for .connect()

func handle_asteroid_destroy():
    asteroid_instance.disconnect("destroy", self, "handle_asteroid_destroy")

However, I don't think you need to worry about doing this. I think this is only for when you no longer want a node to listen to a signal, not for cleanup which should be done for you.

---

Also, if you don't want to save the reference to the specific asteroid in the spawner, you can pass that along with the destroy signal:

# Asteroid.gd

func some_function():
   emit_signal("destroy", self)

then in your handle_asteroid_destroy() function:

# AsteroidSpawner.gd

func handle_asteroid_destroy(asteroid):
    asteroid.disconnect("destroy", self, "handle_asteroid_destroy")

Comments

@Eric Ellingson Thanks, however I want to make sure the handler was disconnected. I couldn't find any related information about this, how do I get list of connected signal handlers?