Signals in Godot 4

icon.gd

extends Sprite2D

var rotating = true
signal rotating_toggled(is_rotating:bool)

func _ready() -> void:
	rotating_toggled.emit(rotating)

func _process(delta: float) -> void:
	if rotating:
		rotate(delta)

func _input(event: InputEvent) -> void:
	if event.is_action_pressed("ui_accept"):
		rotating = !rotating
		rotating_toggled.emit(rotating)

main_custom_signal.gd

extends Node2D

func _process(delta: float) -> void:
	pass

func _on_icon_rotating_toggled(is_rotating) -> void:
	var text = ""
	if is_rotating:
		text = "Rotating: active"
	else:
		text = "Rotating: paused"
	$RotatingStatus.text = text

main_timer.gd

extends Node2D

var rotate_icon = true

func _process(delta: float) -> void:
	if rotate_icon:
		$Icon.rotate(delta)

func _on_timer_timeout() -> void:
	rotate_icon = !rotate_icon