xNode/Scripts/Editor/NodeEditorGUILayout.cs

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using UnityEditor;
using UnityEngine;

/// <summary> UNEC-specific version of <see cref="EditorGUILayout"/> </summary>
public static class NodeEditorGUILayout  {

    public static void PropertyField(SerializedProperty property, bool includeChildren = true) {
        if (property == null) throw new NullReferenceException();
        Node node = property.serializedObject.targetObject as Node;
        NodePort port = node.GetPortByFieldName(property.name);

        float temp_labelWidth = EditorGUIUtility.labelWidth;

        // If property is not a port, display a regular property field
        if (port == null) EditorGUILayout.PropertyField(property, includeChildren);
        else {
            Rect rect = new Rect();

            // If property is an input, display a regular property field and put a port handle on the left side
            if (port.direction == NodePort.IO.Input) {
                // Display a label if port is connected
                if (port.IsConnected) EditorGUILayout.LabelField(property.displayName);
                // Display an editable property field if port is not connected
                else EditorGUILayout.PropertyField(property, includeChildren);
                rect = GUILayoutUtility.GetLastRect();
                rect.position = rect.position - new Vector2(16, 0);
            // If property is an output, display a text label and put a port handle on the right side
            } else if (port.direction == NodePort.IO.Output) {
                EditorGUILayout.LabelField(property.displayName, NodeEditorResources.styles.outputPort);
                rect = GUILayoutUtility.GetLastRect();
                rect.position = rect.position + new Vector2(rect.width, 0);
            }

            rect.size = new Vector2(16, 16);

            DrawPortHandle(rect, port.type);

            // Register the handle position
            Vector2 portPos = rect.center;
            if (NodeEditor.portPositions.ContainsKey(port)) NodeEditor.portPositions[port] = portPos;
            else NodeEditor.portPositions.Add(port, portPos);
        }
        EditorGUIUtility.labelWidth = temp_labelWidth;
    }

    private static void DrawPortHandle(Rect rect, Type type) {
        Color col = GUI.color;
        GUI.color = new Color32(90, 97, 105, 255);
        GUI.DrawTexture(rect, NodeEditorResources.dotOuter);
        GUI.color = NodeEditorPreferences.GetTypeColor(type);
        GUI.DrawTexture(rect, NodeEditorResources.dot);
        GUI.color = col;
    }
}