ScriptableRenderPipeline/com.unity.shadergraph/Editor/Drawing/Views/NodeSettingsView.cs

using System;
using System.Linq;
using UnityEditor.Graphing;
using UnityEngine;
using UnityEngine.Experimental.UIElements;

namespace UnityEditor.ShaderGraph.Drawing
{
    public class NodeSettingsView : VisualElement
    {
        VisualElement m_ContentContainer;

        public NodeSettingsView()
        {
            pickingMode = PickingMode.Ignore;
            AddStyleSheetPath("Styles/NodeSettings");
            var uxml = Resources.Load<VisualTreeAsset>("UXML/NodeSettings");
            uxml.CloneTree(this, null);
            // Get the element we want to use as content container
            m_ContentContainer = this.Q("contentContainer");
            RegisterCallback<MouseDownEvent>(OnMouseDown);
            RegisterCallback<MouseUpEvent>(OnMouseUp);
        }

        void OnMouseUp(MouseUpEvent evt)
        {
            evt.StopPropagation();
        }

        void OnMouseDown(MouseDownEvent evt)
        {
            evt.StopPropagation();
        }

        public override VisualElement contentContainer
        {
            get { return m_ContentContainer; }
        }
    }
}