c# - 如何使用按钮更改枚举项？

Question

using System.Collections;
using System.Collections.Generic;
using UnityEditor;
using UnityEngine;
using UnityEditor.IMGUI;

public class ChangeShaderRenderingModes : EditorWindow
{
    public enum BlendMode
    {
        Opaque,
        Cutout,
        Fade,
        Transparent
    }

    static Material material;
    static Material objectMat;
    static int modeIndex = 0;

    [MenuItem("Tools/Change Rendering Modes")]
    public static void ShowWindow()
    {
        GetWindow<ChangeShaderRenderingModes>("ChangeRenderingModes");
    }

    private void OnGUI()
    {
        if(GUI.Button(new Rect(50,50,50,50), "Switch Mode"))
        {
            var objects = Selection.objects;

            Shader shader = Shader.Find("Standard");
            material = new Material(shader);

            if (modeIndex == 4)
                modeIndex = 0;

            ChangeRenderMode(material, BlendMode.Opaque);

            GameObject go = GameObject.Find("test");

            objectMat = go.GetComponent<Renderer>().sharedMaterial;
            objectMat = material;
            go.GetComponent<Renderer>().sharedMaterial = material;
        }
    }

    public static void ChangeRenderMode(Material standardShaderMaterial, BlendMode blendMode)
    {
        switch (blendMode)
        {
            case BlendMode.Opaque:
                standardShaderMaterial.SetInt("_SrcBlend", (int)UnityEngine.Rendering.BlendMode.One);
                standardShaderMaterial.SetInt("_DstBlend", (int)UnityEngine.Rendering.BlendMode.Zero);
                standardShaderMaterial.SetInt("_ZWrite", 1);
                standardShaderMaterial.DisableKeyword("_ALPHATEST_ON");
                standardShaderMaterial.DisableKeyword("_ALPHABLEND_ON");
                standardShaderMaterial.DisableKeyword("_ALPHAPREMULTIPLY_ON");
                standardShaderMaterial.renderQueue = -1;
                break;
            case BlendMode.Cutout:
                standardShaderMaterial.SetInt("_SrcBlend", (int)UnityEngine.Rendering.BlendMode.One);
                standardShaderMaterial.SetInt("_DstBlend", (int)UnityEngine.Rendering.BlendMode.Zero);
                standardShaderMaterial.SetInt("_ZWrite", 1);
                standardShaderMaterial.EnableKeyword("_ALPHATEST_ON");
                standardShaderMaterial.DisableKeyword("_ALPHABLEND_ON");
                standardShaderMaterial.DisableKeyword("_ALPHAPREMULTIPLY_ON");
                standardShaderMaterial.renderQueue = 2450;
                break;
            case BlendMode.Fade:
                standardShaderMaterial.SetInt("_SrcBlend", (int)UnityEngine.Rendering.BlendMode.SrcAlpha);
                standardShaderMaterial.SetInt("_DstBlend", (int)UnityEngine.Rendering.BlendMode.OneMinusSrcAlpha);
                standardShaderMaterial.SetInt("_ZWrite", 0);
                standardShaderMaterial.DisableKeyword("_ALPHATEST_ON");
                standardShaderMaterial.EnableKeyword("_ALPHABLEND_ON");
                standardShaderMaterial.DisableKeyword("_ALPHAPREMULTIPLY_ON");
                standardShaderMaterial.renderQueue = 3000;
                break;
            case BlendMode.Transparent:
                standardShaderMaterial.SetInt("_SrcBlend", (int)UnityEngine.Rendering.BlendMode.One);
                standardShaderMaterial.SetInt("_DstBlend", (int)UnityEngine.Rendering.BlendMode.OneMinusSrcAlpha);
                standardShaderMaterial.SetInt("_ZWrite", 0);
                standardShaderMaterial.DisableKeyword("_ALPHATEST_ON");
                standardShaderMaterial.DisableKeyword("_ALPHABLEND_ON");
                standardShaderMaterial.EnableKeyword("_ALPHAPREMULTIPLY_ON");
                standardShaderMaterial.renderQueue = 3000;
                break;
        }
    }
}

我想让每次单击按钮时它都会切换到下一个模式。不透明、镂空、淡入淡出、透明

然后在Transparent之后回到第一个Opaque

问题在于 ChangeRenderMode 方法获得了一种特定模式。我希望当单击按钮时，一旦 ChangeRenderMode 将获得不透明，然后下一次单击它将获得 Cutout，然后是 Fade 和 Transparent。

Answer 1

枚举以默认值 0 开始，每项增加 1，因此

public enum BlendMode
{
    Opaque,   // = 0
    Cutout,   // = 1
    Fade,     // = 2
    Transparent  // = 3
}

所以你可以把它解析成int计算下一个值然后再把它解析成BlendMode:

在您的 OnGUI 函数中，替换

if (modeIndex == 4)
    modeIndex = 0;
ChangeRenderMode(material, BlendMode.Opaque);

与

var values = (BlendMode[])Enum.GetValues(typeof(BlendMode))
modeIndex = (BlendMode)((modeIndex+1) % values.Length);
ChangeRenderMode(material, blendMode);