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Unity3d property drawer for automatically making enums flags into mask fields in the inspector.

Usage: Put the .cs files somewhere in your project. When you have an enum field you want to turn into a mask field in the inspector, add the EnumFlag attribute over the field. Eg:

[EnumFlag]
MyCustomEnum thisEnum;
// This lets you give the field a custom name in the inspector.
[EnumFlag("Custom Inspector Name")]
MyCustomEnum anotherEnum;

using System;
using System.Reflection;
using UnityEditor;
using UnityEngine;

[CustomPropertyDrawer(typeof(EnumFlagAttribute))]
public class EnumFlagDrawer : PropertyDrawer {
	public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
	{
		EnumFlagAttribute flagSettings = (EnumFlagAttribute)attribute;
		Enum targetEnum = (Enum)Enum.ToObject(fieldInfo.FieldType, property.intValue);

		GUIContent propName = new GUIContent(flagSettings.enumName);
		if (string.IsNullOrEmpty(flagSettings.enumName))
			propName = label;

		EditorGUI.BeginProperty(position, label, property);
		Enum enumNew = EditorGUI.EnumMaskField(position, propName, targetEnum);
		property.intValue = (int)Convert.ChangeType(enumNew, fieldInfo.FieldType);
		EditorGUI.EndProperty();
	}
}

using UnityEngine;

public class EnumFlagAttribute : PropertyAttribute
{
	public string enumName;

	public EnumFlagAttribute() {}

	public EnumFlagAttribute(string name)
	{
		enumName = name;
	}
}