Do something every time an attribute change

Question

Hi,
I need to make something every time some Spatial.translation changes. The trivial solution would be to write that_function(Spatial.translation) inside all the functions in which Spatial.translation changes.

I neither want to use a _process(delta) or similar function because it is a turn-based game.

Thanks!

Comments

Have you looked at setters and getters to help with your problem?

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Could you give us more information on the operations you want to perform on each attribute modification

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It seems that it does not work for my case since Spatial.translation is already defined:
var translation : Vector3 setget changeTranlation
gives
The member 'translation' alredy exists in a parent class

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I want to change Spatial.name everytime Spatial.translation changes. This Spatials are voxels in a voxel-based game, so it is sometimes useful that Spatial.name = var2str(Spatial.translation).

This days I had an idea so I do not need this feature, but not tested yet. Otherwise, it would be a good idea to know how to solve a similar problem, noticing that setget does not work for already defined variables (built-in).

Answer 1

I'd use signals.
Create a signal:

signal translation_changed

in the ready function connect the signal to the script:

connect("translation_changed",self,"_on_translation_changed")

then, where you change your translatino you emit the signal:

emit_signal("translation_changed")

and put your code to do stuff when it changed in a function called "_on_translatoin_changed", or how you decide to call it, just make sure its passed as the 3rd argument in the connect function.

Comments

That would work. My first idea was to create a function like
func change_translation(vector): translation = vector do something with the translation
but your option is also good. In fact, I prefer your solution ;)

Thanks!