UnityImageProcessing_Package/Editor/Scripts/Editor/Windows/ImageProcessingGraphNodeVisual.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using ImageProcessingGraph.Editor.Nodes.NodeAttributes;
using UnityEditor.Experimental.GraphView;
using UnityEditor.UIElements;
using UnityEngine;
using UnityEngine.UIElements;
using Input = ImageProcessingGraph.Editor.Nodes.NodeAttributes.Input;

namespace ImageProcessingGraph.Editor.Unity_Image_Processing.Scripts.Editor.Windows
{
    public class ImageProcessingGraphNodeVisual : Node
    {
        private BaseImageNode graphNode;
        public BaseImageNode GraphNode => graphNode;

        public List<Port> InputPorts { get; }
        public List<Port> OutputPorts { get; }

        private ImageProcessingGraphViewWindow window;
        
        public ImageProcessingGraphNodeVisual(BaseImageNode node, ImageProcessingGraphViewWindow window)
        {
            this.AddToClassList("image-node-visual");
            this.window = window;

            graphNode = node;
            Type typeInfo = node.GetType();

            NodeInfoAttribute info = typeInfo.GetCustomAttribute<NodeInfoAttribute>();
            title = info.Title;

            string[] depths = info.MenuItem.Split('/');
            foreach (var depth in depths)
            {
                this.AddToClassList(depth.ToLower().Replace(' ', '-'));
            }

            this.InputPorts = new List<Port>();
            this.OutputPorts = new List<Port>();

            List<Input> inputs = new List<Input>();
            List<FieldInfo> inputFieldInfo = new List<FieldInfo>();
            List<FieldInfo> outputFieldInfo = new List<FieldInfo>();

            FieldInfo[] fields = typeInfo.GetFields(BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public);
            foreach (var field in fields)
            {
                if (field.GetCustomAttribute(typeof(Input)) != null)
                {
                    Input input = field.GetCustomAttribute<Input>();
                    inputs.Add(input);
                    inputFieldInfo.Add(field);
                }

                if (field.GetCustomAttribute(typeof(Output)) != null)
                {
                    Output output = field.GetCustomAttribute<Output>();
                    outputFieldInfo.Add(field);
                }
                    
            }

            CreateInputPorts(inputFieldInfo);
            CreateOutputPorts(outputFieldInfo);

            this.name = typeInfo.Name;
        }

        private void CreateInputPorts(List<FieldInfo> fields)
        {
            for (var index = 0; index < fields.Count; index++)
            {
                var field = fields[index];
                /*
                Port port = InstantiatePort(Orientation.Horizontal, Direction.Input, Port.Capacity.Multi, field.FieldType);
                */
                
                var port = IPTPort.Create(window.edgeConnectorListener, true, field.FieldType);
                
                string label = field.GetCustomAttribute<Input>().Label;
                if (label != "")
                    port.portName = label; 
                InputPorts.Add(port);

                inputContainer.Add(port);
                ExposeVariableToPort(port, field);
                
            }
        }

        private void CreateOutputPorts(List<FieldInfo> fields)
        {
            for (var index = 0; index < fields.Count; index++)
            {
                var field = fields[index];
                var port = IPTPort.Create(window.edgeConnectorListener, false, field.FieldType);
                
                string label = field.GetCustomAttribute<Output>().Label;
                if (label != "")
                    port.portName = label; 
                OutputPorts.Add(port);

                outputContainer.Add(port);
            }
        }

        // Exposes a variable on the port for editing when it's not connected
        private void ExposeVariableToPort(Port port, FieldInfo field)
        {
            // Only expose when the port is not connected
            if (port.connections.Count() == 0)
            {
                var propertyFieldContainer = new VisualElement();
                propertyFieldContainer.name = "property-field-container";
                var propertyField = CreatePropertyFieldForType(field.FieldType, field.GetValue(graphNode));

                if (propertyField != null)
                {
                    // Register a callback for when the value changes
                    if (propertyField is IntegerField intField)
                    {
                        intField.RegisterValueChangedCallback(evt =>
                        {
                            field.SetValue(graphNode, evt.newValue);  // Update the field with the new value
                        });
                    }
                    else if (propertyField is FloatField floatField)
                    {
                        floatField.RegisterValueChangedCallback(evt =>
                        {
                            field.SetValue(graphNode, evt.newValue);  // Update the field with the new value
                        });
                    }
                    else if (propertyField is Toggle boolField)
                    {
                        boolField.RegisterValueChangedCallback(evt =>
                        {
                            field.SetValue(graphNode, evt.newValue);  // Update the field with the new value
                        });
                    }
                    else if (propertyField is TextField stringField)
                    {
                        stringField.RegisterValueChangedCallback(evt =>
                        {
                            field.SetValue(graphNode, evt.newValue);  // Update the field with the new value
                        });
                    }
                    else if (propertyField is ColorField colorField)
                    {
                        colorField.RegisterValueChangedCallback(evt =>
                        {
                            field.SetValue(graphNode, evt.newValue);  // Update the field with the new value
                        });
                    }
                    else if (propertyField is Vector3Field vector3Field)
                    {
                        vector3Field.RegisterValueChangedCallback(evt =>
                        {
                            field.SetValue(graphNode, evt.newValue);  // Update the field with the new value
                        });
                    }
                    else if (propertyField is Vector2Field vector2Field)
                    {
                        vector2Field.RegisterValueChangedCallback(evt =>
                        {
                            field.SetValue(graphNode, evt.newValue);  // Update the field with the new value
                        });
                    }
                    else if (propertyField is ObjectField objectField)
                    {
                        objectField.RegisterValueChangedCallback(evt =>
                        {
                            field.SetValue(graphNode, evt.newValue);  // Update the field with the new value
                        });
                    }

                    propertyFieldContainer.Add(propertyField);
                    port.Add(propertyFieldContainer);
                }
            }
            else
            {
                // If the port is connected, remove the exposed UI element
                var existingPropertyFieldContainer = port.Q<VisualElement>("property-field-container");
                if (existingPropertyFieldContainer != null)
                {
                    port.Remove(existingPropertyFieldContainer);
                }
            }
        }

        // Create appropriate property field based on the type of the variable
        private VisualElement CreatePropertyFieldForType(Type type, object value)
        {
            if (type == typeof(int))
            {
                var intField = new IntegerField { value = (int)value };
                return intField;
            }
            else if (type == typeof(float))
            {
                var floatField = new FloatField { value = (float)value };
                return floatField;
            }
            else if (type == typeof(bool))
            {
                var boolField = new Toggle { value = (bool)value };
                return boolField;
            }
            else if (type == typeof(string))
            {
                var stringField = new TextField { value = (string)value };
                return stringField;
            }
            else if (type == typeof(Color))
            {
                var colorField = new ColorField() { value = (Color)value };
                return colorField;
            }
            else if (type == typeof(Vector3))
            {
                var vector3Field = new Vector3Field { value = (Vector3)value };
                return vector3Field;
            }
            else if (type == typeof(Vector2))
            {
                var vector2Field = new Vector2Field { value = (Vector2)value };
                return vector2Field;
            }
            else if (type == typeof(Texture2D))
            {
                var objectField = new ObjectField { value = (Texture2D)value, objectType = typeof(Texture2D) };
                return objectField;
            }

            // Add more types as needed (Vector3, etc.)
            return null;
        }

        public void SavePosition() => graphNode.SetPosition(GetPosition());
    }
}