Beginner: Tween not executing when receiving signal

[JamesDerril]

Godot Version

4.2.2

Hello everyone,

I am strugeling with understanding why my tween is not being executed when I send out my custom signal.
I have a “Game_Level” scene which is the parent of “Player”. In player I have this code:

extends Node2D
...
func swipe_detection():
	if Input.is_action_just_pressed("press"):
		print(swipeActive)
		if !swipeActive:
			swipeActive = true
			startPosSwipe = get_global_mouse_position()
			print("Start Position: ", startPosSwipe)
			
	if Input.is_action_just_released("press") and swipeActive:
		endPosSwipe = get_global_mouse_position()
		print("End Position: ", endPosSwipe)
		# calculate the drag distance in x and y
		var deltaX = startPosSwipe.x - endPosSwipe.x
		var deltaY = startPosSwipe.y - endPosSwipe.y
		#print("deltaX: ", deltaX, " start Position: ", startPosSwipe.x, " End Position: ", endPosSwipe.x)
		print("deltaY: ", deltaY, " start Position: ", startPosSwipe.y, " End Position: ", endPosSwipe.y)
		
		if deltaX >= SWIPETHRESHOLDLeft and swipeActive:
			print("Swipe left detected!")
			swipeActive = false
			left_swipe.emit()
.....

In the code above I emit the left_swipe signal to “Game_Level” every time i swipe left. This works to the point, that I can print in “Game_Level” every time i swipe left. Which shows me, that my signal is being emitted correctly.
The problem is though, that the tween is not being executed in the following “Game_Level” code:

extends Node2D
@onready var tween_left = get_tree().create_tween()
# Called when the node enters the scene tree for the first time.
func _ready():
	pass

# Called every frame. 'delta' is the elapsed time since the previous frame.
func _process(delta):
	pass

func _on_player_left_swipe():
	print("Swipe signal detected")
	tween_left.tween_property($Player, "position", Vector2(260, $Player.player_begin_pos_y), 1)

Could someone please explain why the tween is not being executed?
Also when I call the function _on_player_left_swipe() in func _process(delta) it is being executed right away. Even before I swipe and thus emit the signal. This makes not much sense to me.

Beste regards,
James

[Locher]

The moment you create the tween, the tween is running.
I would refactor your code as follows:

extends Node2D
var tween_left: Tween
# Called when the node enters the scene tree for the first time.
func _ready():
	pass

# Called every frame. 'delta' is the elapsed time since the previous frame.
func _process(delta):
	pass

func _on_player_left_swipe():
	print("Swipe signal detected")
	if tween_left: tween_left.kill() # Just in case the tween was already running
	tween_left = create_tween()
	tween_left.tween_property($Player, "position", Vector2(260, $Player.player_begin_pos_y), 1)

[JamesDerril]

Thank you so much!

I see now where my understanding of tweens was wrong!
Have a good day!