extends Control

onready var background = get_node("background")
onready var tween = get_node("tween")

signal on_transition_time()
signal on_transition_completed()

const TRANSITION_TIME = 1.0

func _ready():
	pass

func start_transition():
	
	tween.interpolate_property(
		background, "color:a", background.color.a, 1.0,
		TRANSITION_TIME, Tween.TRANS_QUAD,
		Tween.EASE_IN_OUT
	)
	
	tween.start()
	yield(tween, "tween_completed")
	emit_signal("on_transition_time")
	
	tween.interpolate_property(
		background, "color:a", background.color.a, 0.0,
		TRANSITION_TIME, Tween.TRANS_QUAD,
		Tween.EASE_IN_OUT
	)
	tween.start()
	yield(tween, "tween_completed")
	emit_signal("on_transition_completed")