[GDExtension] Adding array of resources as properties

Help Programming
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3

So… I’ve been experimenting a bit and i finally figured it out.
Here is how to expose and array of Ref<WhateverRefCounted> as a property of a node/resource.

namespace godot {

MAKE_TYPED_ARRAY(Ref<Image>, Variant::OBJECT)
MAKE_TYPED_ARRAY_INFO(Ref<Image>, Variant::OBJECT)

class ImageCollection : public Resource {

    GDCLASS(ImageCollection, Resource)

private:
    TypedArray<Ref<Image>> m_images;

public:
    void set_images(TypedArray<Ref<Image>> p_images)
    {
        m_images = p_images;
    }

    TypedArray<Ref<Image>> get_images() const
    {
        return m_images;
    }

protected:
    static void _bind_methods()
    {
        ClassDB::bind_method(D_METHOD("set_images", "images"), &ImageCollection::set_images);
        ClassDB::bind_method(D_METHOD("get_images"), &ImageCollection::get_images);
        ADD_PROPERTY(
			PropertyInfo(
				Variant::ARRAY,
				"images",
				PROPERTY_HINT_TYPE_STRING,
                String::num(Variant::OBJECT) + "/" + String::num(PROPERTY_HINT_RESOURCE_TYPE) + "Image"
			),
			"set_images",
			"get_images"
		);
    }
};

}
  1. Use the MAKE_TYPED_ARRAY and MAKE_TYPED_ARRAY_INFO macros with your Ref<Whatever> as first parameter and Variant::OBJECT for the second parameter. To avoid re-declarations I suggest doing this in a separate file since this macros declare new types.
  2. Use TypedArrays (not Vector like i did in my first example).
  3. Do not pass values to the setters by reference, only by value.
  4. When binding your property, in the PropertyInfo use PROPERTY_HINT_TYPE_STRING as property hint and for the hint string pass String::num(Variant::OBJECT) + "/" + String::num(PROPERTY_HINT_RESOURCE_TYPE) + "Image" with the intended resource type instead of “Image” (source: this post)

I tested this a lil bit and it seems to function as it should, I hope your PC doesn’t explode because of me.
I hope to have been helpfull.