Specifying which variable to change with export variable

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1

Godot Version

4.6

Question

so im trying to make a button that changes a global variable to true or false, and i want to specify which global variable to change using an export variable. is that possible? if yes, how do you do that?

2

Yes, but why? It seems a little overengineered, so if you could explain what you’re trying to achieve, we might be able to suggest a proper way of doing it.

You can use set() method for that.

E.g.

@export var property_to_change: StringName = "test_property"

func _ready() -> void:
	# These 2 lines are equivalent:
	Globals.set(property_to_change, "test_value")
	Globals.test_property = "test_value"
1 Like
3

You could add a string as an argument to the button press signal and then use set() with the string and !the_bool to set the variable of that name to opposite of what it was before the press.

4

thanks! that worked.

i was trying to make a settings menu using custom made buttons

5

One way to do this is to add metadata to the button. For example, add metadata named what_to_change(type String). Then set the metadata to the button and check the metadata in the button’s pressed handler:

func _on_button_pressed() -> void:
	match get_meta("what_to_change"):
		"foo":
			global_variable_foo = 42
		"bar":
			something_else = 6

But I would do that only if there were a lot of buttons and they all need to share some common code. For example they all call some function and I can set the function’s parameter value using the metadata. In most cases it is much better just to do separate pressed signal handlers to each button.