Default Editor : Enum as flags ?

T$$anonymous$$s bugs me too but after some quick experimentation I t$$anonymous$$nk you can do it pretty trivially using the property drawer stuff. The main t$$anonymous$$ng I noticed is to be aware of how Unity treats "Everyt$$anonymous$$ng" as t$$anonymous$$s sets all bits. I suspect it will also run in to problems if you leave gaps in your flags. I couldn't find a way to get the actual System.Type from the SerializedProperty, if it were possible to get t$$anonymous$$s then you could make it more robust and also decide whether you want everyt$$anonymous$$ng to mean set all bits or not. Anyway the code:

 public class EnumFlagsAttribute : PropertyAttribute
 {
     public EnumFlagsAttribute() { }
 }
 
 [CustomPropertyDrawer(typeof(EnumFlagsAttribute))]
 public class EnumFlagsAttributeDrawer : PropertyDrawer
 {
     public override void OnGUI(Rect _position, SerializedProperty _property, GUIContent _label)
     {
         _property.intValue = EditorGUI.MaskField( _position, _label, _property.intValue, _property.enumNames );
     }
 }

To use t$$anonymous$$s you do the following:

 [System.Flags]
 public enum MyMaskedEnum
 {
     Flag0 = (1 << 0),
     Flag1 = (1 << 1),
     Flag2 = (1 << 2),
     Flag3 = (1 << 3),
 }
 
 class MyObject : MonoBehaviour
 {
     [SerializeField] [EnumFlagsAttribute] MyMaskedEnum m_flags;
 }