Passing signal arguments into variable's custom setter

Help Programming
1

Godot Version

4.2.1

Question

When connecting a custom signal with arguments in the emit, I am trying to use that signal to alter a variable using a custom setter. I’ve been able to get the argument through when the setter has a custom function:

var hearts = 4: set = set_hearts, get = get_hearts
func set_hearts(value):
	hearts = clamp(value, 0, max_hearts)
	if heart_ui_full != null:
		heart_ui_full.size.x = hearts * HEART_SIZE
func get_hearts():
	return hearts

[…]

func _ready():
	max_hearts = PlayerStats.max_health
	hearts = PlayerStats.health
	PlayerStats.health_changed.connect(set_hearts)

That works, but with unnamed setters it doesn’t:

var max_hearts = 4:
	set(value):
		max_hearts = max(value, 1)
		hearts = min(hearts, max_hearts)
		if heart_ui_empty != null:
			heart_ui_empty.size.x = max_hearts * HEART_SIZE
	get:
		return max_hearts

[…]

func _ready():
	max_hearts = PlayerStats.max_health
	hearts = PlayerStats.health
	PlayerStats.max_health_changed.connect(max_hearts)

This gives the error “Invalid type in function connect in base signal. Cannot convert argument 1 from int to Callable.”

I’ve tried max_hearts.set() to no avail as well “nonexistant function set in base int”

For now, I can use the first method, but would like to know what I’m doing wrong and how to fix it to use the unnamed setter.

2

When you use set(value) you are no longer using a function. In the connect, the argument, max_hearts, must be a function, but it’s an int.

You could try an anon lambda:

...connect(func(n): max_hearts=n) Assuming you emit an int argument.

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