Godot: Call setters / getters of setget variables when set / gotten from a child class

[raymoo]

I'm trying to expose an interface for subclasses of a class similar to the built-in properties (like position) that already exist, but it seems like the functions are not called by sets / gets from inheriting classes.

It's not clear in the docs whether this is intended or not, since it only says that local (in scope?) accesses do not call the setters / getters. If the current behavior is intended then this is a feature request.

[vnen]

This is not a bug, it's the intended way. Calling getters/setters in this case would be a big performance hit. You need to manually force the setter/getter by indexing self: self.property.

Looks the same as #13331.

[raymoo]

Yes, I think this is a duplicate. Though I think that it should be possible to know at some point before actually running a variable access whether it can do a direct access or if it needs to call getters / setters (already suggested by @letheed in the other issue).

[bojidar-bg]

I think the current behaviour should be changed, since it hampers plugin-makers a bit.
For example:

# res://addons/testaddon/testnode.gd
export var image_rotation
export var image_rotation_degrees setget get_image_rotation_degrees, set_image_rotation_degrees

# res://TestNode.gd
extends "res://addons/testaddon/testnode.gd"
func _ready():
    image_rotation_degrees = 90

The creator of the TestNode script tried to make it similar to core classes by adding rotation in both radians and degrees. Unfortunately, a script for his custom node currently cannot specify angles in degrees, since it won't update the real rotation as the setter won't get called.

I'm not sure it is an exact duplicate since the other issue talks about all properties, while this one is about inherited only.

[letheed]

My issue was a bit poorly formulated looking back, but I think I'm not the only one who wishes we had something like properties without the need for self..

@bojidar-bg inheritance was indeed the biggest motivation for me, though I should probably have mentioned that in my first comment then.

[vnen]

Plugging in annotations (#20318), we could add one to force the setget to always be used. With the new parser changes it's possible to fix this at compile time, so there should not be any performance hits for the other variables.

[Calinou]

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[vnen]

Note that my proposal for properties (https://github.com/godotengine/godot-proposals/issues/844) would solve this.