Improved SceneManager

SceneManager.gd

extends Node

onready var anim = $Fader/AnimationPlayer

func change_scene(next_scene, params=[]):
	"""
	Changes scene with a transition.
	You can hold the fade back in transition if desired until
	the next scene is in a state that is considered ready
	"""
	get_tree().paused = true
	
	anim.play_backwards("Fade")
	yield(anim, "animation_finished")
	
	$Fader/Label.visible = true
	
	var scene = get_tree().current_scene
	if scene.has_method("_teardown"):
		var state = scene._teardown()
		if state and state is GDScriptFunctionState:
			yield(state, "completed")
	
	get_tree().change_scene(next_scene)
	yield(get_tree(), "idle_frame")
	
	scene = get_tree().current_scene
	
	if scene.has_method("_setup"):
		var state = scene._setup(params)
		if state and state is GDScriptFunctionState:
			yield(state, "completed")
		
	$Fader/Label.visible = false
	anim.play("Fade")
	yield(anim, "animation_finished")
	
	get_tree().paused = false