Gizmo表示をスクリプトから制御する(2022.1以前のリフレクションを使った手法)

GizmoVisibleSwitcher.cs

/// <summary>
/// Gizmo表示をスクリプトから変更するためのクラス
/// </summary>
public class GizmoVisibleSwitcher
{
    Type annotation;
    Type annotationUtility;

    MethodInfo getAnnotations;
    MethodInfo setGizmoEnabled;
    MethodInfo setIconEnabled;

    public GizmoVisibleSwitcher()
    {
        annotation = Type.GetType("UnityEditor.Annotation, UnityEditor");
        annotationUtility = Type.GetType("UnityEditor.AnnotationUtility, UnityEditor");

        getAnnotations = annotationUtility.GetMethod("GetAnnotations", BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Static);
        setGizmoEnabled = annotationUtility.GetMethod("SetGizmoEnabled", BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Static);
        setIconEnabled = annotationUtility.GetMethod("SetIconEnabled", BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Static);
    }

    /// <summary>
    /// すべてのGizmoの表示非表示を切り替える
    /// </summary>
    /// <param name="value">true:表示 false:非表示</param>
    public void SwitchAllGizmos(bool value)
    {
        var classId = annotation.GetField("classID");
        var scriptClass = annotation.GetField("scriptClass");

        var visible = value ? 1 : 0;

        var annotations = (Array)getAnnotations.Invoke(null, null);
        foreach (var annotation in annotations) {
            var classIdValue = (int)classId.GetValue(annotation);
            var scriptClassValue = (string)scriptClass.GetValue(annotation);

            setGizmoEnabled.Invoke(null, new object[] { classIdValue, scriptClassValue, visible, false });
            setIconEnabled.Invoke(null, new object[] { classIdValue, scriptClassValue, visible});
        }
    }

    /// <summary>
    /// <typeparamref name="T"/> のGizmoの表示非表示を切り替える
    /// </summary>
    /// <param name="value">true:表示 false:非表示</param>
    /// <typeparam name="T">切り替えたい型</typeparam>
    public void SwitchGizmo<T>(bool value) where T : Component
    {
        var typeName = typeof(T).Name;
        var classId = annotation.GetField("classID");
        var scriptClass = annotation.GetField("scriptClass");

        var visible = value ? 1 : 0;

        var annotations = (Array)getAnnotations.Invoke(null, null);
        foreach (var annotation in annotations) {
            var scriptClassValue = (string)scriptClass.GetValue(annotation);
            if (scriptClassValue.Equals(typeName) == false) {
                continue;
            }

            var classIdValue = (int)classId.GetValue(annotation);
            setGizmoEnabled.Invoke(null, new object[] { classIdValue, scriptClassValue, visible, false });
            setIconEnabled.Invoke(null, new object[] { classIdValue, scriptClassValue, visible });
            break;
        }
    }
}