Laurens-Packages/Packages/com.unity.visualeffectgraph/Editor/Manipulators/SuperCollapser.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using UnityEditor.Experimental.GraphView;
using UnityEngine;
using UnityEngine.UIElements;

namespace UnityEditor.VFX.UI
{
    class SuperCollapser : Manipulator
    {
        public SuperCollapser()
        {
        }

        protected override void RegisterCallbacksOnTarget()
        {
            target.RegisterCallback<MouseDownEvent>(OnMouseUp);
        }

        protected override void UnregisterCallbacksFromTarget()
        {
            target.UnregisterCallback<MouseDownEvent>(OnMouseUp);
        }

        void OnMouseUp(MouseDownEvent e)
        {
            if (e.clickCount == 2 && e.button == (int)MouseButton.LeftMouse)
            {
                VFXNodeUI slotContainer = (VFXNodeUI)target;

                slotContainer.controller.superCollapsed = !slotContainer.superCollapsed;
            }
        }
    }
}