BITFALL/Assets/BITKit/Unity/Scripts/Scenes/Editor/MaterialPaletteWindow.cs

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEditor;
using UnityEditor.UIElements;
using UnityEngine;
using UnityEngine.UIElements;
using Object = UnityEngine.Object;

namespace BITKit
{
	public class MaterialPaletteWindow : EditorWindow
	{
		[MenuItem("Tools/Scenes/Material Palette")]
		public static void Open()
		{
			GetWindow<MaterialPaletteWindow>().Show();
		}

		private Button buildButton;
		private Label _titleLabel;
		private VisualElement _container;

		private Renderer[] _renderers=Array.Empty<Renderer>();
		
		private void OnEnable()
		{
			UnityEditor.Selection.selectionChanged += OnSelectionChanged;
			
			rootVisualElement.Clear();
			_titleLabel = rootVisualElement.Create<Label>();
			_container = rootVisualElement.Create<VisualElement>();
			
			_titleLabel.text = "选择一个物体";
		}

		private void OnDisable()
		{
			UnityEditor.Selection.selectionChanged -= OnSelectionChanged;
		}

		private void OnSelectionChanged()
		{
			var active = UnityEditor.Selection.activeGameObject;
			
			_container.Clear();

			_titleLabel.text = active ? active.name : "未选择物体";
			if (!active) return;
			foreach (var x in _renderers = active.GetComponentsInChildren<MeshRenderer>())
			{
				foreach (var material in x.sharedMaterials)
				{
					var filed = _container.Create<ObjectField>();
					filed.label = material.name;
					filed.objectType = typeof(Material);
					filed.value = material;
					filed.RegisterValueChangedCallback(OnChanged);
				}
				
			}
		}

		private void OnChanged(ChangeEvent<Object> evt)
		{
			if(evt.newValue is not Material value) return;
			var list = new List<Object>();
			foreach (var renderer in _renderers)
			{
				for (int i = 0; i < renderer.materials.Length; i++)
				{
					var current = renderer.materials[i];
					if (current != evt.previousValue) return;
					
						renderer.materials[i] = value;
					
					list.Add(current);
					
					EditorUtility.SetDirty(renderer);
				}
			}
		}

		private void ReplaceMaterial(Material oldMaterial,Material newMaterial)
		{
			
		}
	}

}