Grab Instancer

GrabInstancer.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace FrooxEngine
{
    [Category("Transform/Interaction")]
    [SingleInstancePerSlot]
    public class GrabInstancer : Component, IGrabbable
    {
        public readonly SyncRef<Slot> Template;
        public readonly Sync<bool> ActivateRoot;
        public readonly Sync<bool> EnableGrabbable;

        public readonly Sync<int> GrabPriority;
        int IGrabbable.GrabPriority => GrabPriority.Value;

        public bool IsGrabbed => false;
        public bool CanGrab => Enabled && Template.Target != null;
        public bool Scalable => false;
        public Grabber Grabber => null;

        protected override void OnAwake()
        {
            ActivateRoot.Value = true;
            EnableGrabbable.Value = true;
        }

        public IGrabbable Grab(Grabber grabber, Slot holdSlot)
        {
            var instance = Template.Target.Duplicate(Slot.Parent);
            var grabbable = instance.GetComponentInChildren<IGrabbable>();

            if (grabbable == null)
                throw new Exception("The template doesn't have an IGrabbable component!");

            if (grabbable is GrabInstancer)
                throw new Exception("The template cannot be another GrabInstancer");

            if (ActivateRoot.Value)
                instance.ActiveSelf = true;

            if (EnableGrabbable.Value)
                grabbable.Enabled = true;

            return grabbable.Grab(grabber, holdSlot);
        }

        public void Release(Grabber grabber)
        {
            throw new NotSupportedException("GrabInstancer cannot be grab released");
        }
    }
}