A question about godot script signal syntax

origami

I just finish the first game tutorial. Dodge the creep. I get a question about the signal. If a scene need receive signal from other scene, let say scene A need to get the signal from scene B. Here is the step on the tutorial : 1. add scene B to scene A as a child node. 2. From A scene panel open scene B and connect the signal to A.

My question is in this case seems A is the parent node as B, but there a always a case B also need A's signal. So we have to add A back as a child node of B? The structure get weird... It is a normal case in godot or just have an another way to solve it when two nodes in the same level both need other signal?

xyz

Signals do not depend on hierarchy. Any node can exchange signals with any other node, including itself. It doesn't matter where they are in the scene tree.

pkowal1982

As xyz said, you can connect nodes which are not in parent/child relation. Here you got example of siblings (script is attached to parent):

extends Node2D

func _ready() -> void:
	$A.connect("button_down", $B, "hide")
	$A.connect("button_up", $B, "show")

	$B.connect("button_down", $A, "hide")
	$B.connect("button_up", $A, "show")

origami

@pkowal1982 said: As xyz said, you can connect nodes which are not in parent/child relation. Here you got example of siblings (script is attached to parent): extends Node2D
func _ready() -> void:
	$A.connect("button_down", $B, "hide")
	$A.connect("button_up", $B, "show")

	$B.connect("button_down", $A, "hide")
	$B.connect("button_up", $A, "show")

I just checked a node signal can only connect with itself if this node have no relationship with any other nodes. So besides parent-child relationship siblings can also connect to each other right? Siblings seems more reasonable.

origami

@xyz said: Signals do not depend on hierarchy. Any node can exchange signals with any other node, including itself. It doesn't matter where they are in the scene tree.

It depends on hierarchy I think, here is a Orphan node when open signal connection panel only itself is seen in the target list.

xyz

No, everything can connect to everything. When you make a connection via gui, the receiver must have a script attached. Otherwise Godot doesn't have a place to put the signal handler function.

origami

@xyz said: No, everything can connect to everything. When you make a connection via gui, the receiver must have a script attached. Otherwise Godot doesn't have a place to put the signal handler function.

All my scene has script attached, do you mean this ? But these two node can't be seen in the connect panel

xyz

If you want MOB's children to receive signals they must have their own scripts attached. Signal is just a function callback. There must be a script in which you'll put this function.