Unclear if property setters and getters are supported

[minkezhang]

See https://docs.godotengine.org/en/stable/tutorials/scripting/gdscript/gdscript_basics.html#properties-setters-and-getters.

When attempting to override a setter of a base class, GDScript offers the _set(k, v) syntax. This is a feature which is accessible via GDExtension as well (source).

Is

var foo: int:
  get:
    return 0
  set:
    pass

or

func _set(k, v):
  if k == 'foo':
    pass

func _get(k, v):
  if k == 'foo':
    foo = 0

syntax supported in graphics.gd?

I see this in internal/api.go --

type ObjectInterface struct {
  Set(StringName, Variant) bool
}

However, attempting to override this in a class --

func (n *N) Set(k string, v variant.Any) bool {
  ...
}

does not seem to be called in GDScript --

n.set("foo", 1)
n.foo = 1

[Splizard]

Ah, yes currently the interface for this is

Set(string, any) bool

The object virtual methods are implicitly defined in the classdb package at the moment.

The canonical method signatures should probably be documented in the Object package.

[minkezhang]

I have tried implementing a class to override Set

type N struct {
  classdb.Extension[N, Node2D.Instance]

  Foo int
}

func (n *N) Set(k string, v variant.Any) bool {
  if k == "foo" { ... }
  return true
}

And in my GDScript

n.foo = 1
n.set("foo", 1)

But it does not seem like n.Set(k, v) is being called. Is this expected behavior (and I'm missing some interaction w/ GDScript)?

[Splizard]

Right you are using the func(string, variant.Any) bool signature which is not supported. The current version only looks for any as the second argument not variant.Any.

[minkezhang]

Ah thank you -- I didn't realize that was what you meant. Swapping out variant.Any with any did indeed work.

[Splizard]

Have updated the variant/Object package with an Interface type that canonically documents which methods can be implemented.