Unity 编辑器扩展十一 DecoratorDrawer

RhinoFreak · 发表于 2021-12-14 21:18

Unity Editor 基础篇（八）：Decorator Drawers
Unity Editor 实践：自定义小工具
一、示例

在Scripts文件夹下添加
using System.Collections;using System.Collections.Generic;using UnityEngine;public class DrawerImageAttribute : PropertyAttribute{ public DrawerImageAttribute() { }}//using System.Collections;using System.Collections.Generic;using UnityEngine;public class TestImageAttribute : MonoBehaviour{ [DrawerImage] public float ff;}
在Editor文件夹下添加
using System.Collections;using System.Collections.Generic;using UnityEngine;using UnityEditor;[CustomPropertyDrawer(typeof(DrawerImageAttribute))]public class DrawerImageAttributeDrawer : DecoratorDrawer{ private Texture2D image; public override void OnGUI(Rect position) { Debug.Log("DrawerImageAttributeDrawer OnGUI"); if (image == null) { image = Resources.Load<Texture2D>("gold"); } GUI.DrawTexture(position, image); } public override float GetHeight() { return base.GetHeight(); }}
如下图，金币图绘制产生变形，需要修改GetHeight() 方法

image.png

2.

using System.Collections;using System.Collections.Generic;using UnityEngine;public class DrawerImageAttribute : PropertyAttribute{ public int height; public DrawerImageAttribute() { } public DrawerImageAttribute(int _height) { height = _height; }}using System.Collections;using System.Collections.Generic;using UnityEngine;using UnityEditor;[CustomPropertyDrawer(typeof(DrawerImageAttribute))]public class DrawerImageAttributeDrawer : DecoratorDrawer{ private Texture2D image; private DrawerImageAttribute _attribute; public override void OnGUI(Rect position) { Debug.Log("DrawerImageAttributeDrawer OnGUI"); if (image == null) { image = Resources.Load<Texture2D>("gold"); } _attribute = (DrawerImageAttribute)attribute; GUI.DrawTexture(position, image); } public override float GetHeight() { return base.GetHeight() + _attribute.height; }}public class TestImageAttribute : MonoBehaviour{ [DrawerImage(150)] public float ff;}
报错了：
NullReferenceException: Object reference not set to an instance of an objectDrawerImageAttributeDrawer.GetHeight () (at Assets/Editor/DrawerImageAttributeDrawer.cs:25)
脚本先调用的是 GetHeight() 方法，因此当我们在 GetHeight() 方法中使用 _attribute.height 的时候便会报空指针的错误，因为此时的 _attribute 还没有初始化，因此让我们添加如下代码：
... private Texture2D image; private DrawerImageAttribute _attribute = new DrawerImageAttribute();

image.png

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Unity 编辑器扩展十一 DecoratorDrawer

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