private void DrawValueFieldInValueMode(Rect position, SerializedProperty property, VariantReference.EditorHelper helper)
        {
            if (helper.Target == null)
            {
                return;
            }
            var variant = helper.Target;

            if (this.RestrictVariantType && helper._type != this.VariantTypeRestrictedTo)
            {
                helper.PrepareForValueTypeChange(this.VariantTypeRestrictedTo);
                GUI.changed = true; //force change
            }

            var r0 = new Rect(position.xMin, position.yMin, 90.0f, EditorGUIUtility.singleLineHeight);
            var r1 = new Rect(r0.xMax, position.yMin, position.xMax - r0.xMax, EditorGUIUtility.singleLineHeight);

            var cache = SPGUI.DisableIf(this.RestrictVariantType);

            EditorGUI.BeginChangeCheck();
            var valueType = variant.ValueType;

            valueType = (VariantType)EditorGUI.EnumPopup(r0, GUIContent.none, valueType);
            if (EditorGUI.EndChangeCheck())
            {
                helper.PrepareForValueTypeChange(valueType);
            }
            cache.Reset();

            if (_typeRestrictedTo.IsEnum)
            {
                variant.IntValue = ConvertUtil.ToInt(EditorGUI.EnumPopup(r1, ConvertUtil.ToEnumOfType(_typeRestrictedTo, variant.IntValue)));
            }
            else
            {
                switch (valueType)
                {
                case VariantType.Null:
                    cache = SPGUI.Disable();
                    EditorGUI.TextField(r1, "Null");
                    cache.Reset();
                    break;

                case VariantType.String:
                    variant.StringValue = EditorGUI.TextField(r1, variant.StringValue);
                    break;

                case VariantType.Boolean:
                    variant.BoolValue = EditorGUI.Toggle(r1, variant.BoolValue);
                    break;

                case VariantType.Integer:
                    variant.IntValue = EditorGUI.IntField(r1, variant.IntValue);
                    break;

                case VariantType.Float:
                    variant.FloatValue = EditorGUI.FloatField(r1, variant.FloatValue);
                    break;

                case VariantType.Double:
                    //variant.DoubleValue = ConvertUtil.ToDouble(EditorGUI.TextField(r1, variant.DoubleValue.ToString()));
                    variant.DoubleValue = EditorGUI.DoubleField(r1, variant.DoubleValue);
                    break;

                case VariantType.Vector2:
                    variant.Vector2Value = EditorGUI.Vector2Field(r1, GUIContent.none, variant.Vector2Value);
                    break;

                case VariantType.Vector3:
                    variant.Vector3Value = EditorGUI.Vector3Field(r1, GUIContent.none, variant.Vector3Value);
                    break;

                case VariantType.Vector4:
                    variant.Vector4Value = EditorGUI.Vector4Field(r1, (string)null, variant.Vector4Value);
                    break;

                case VariantType.Quaternion:
                    variant.QuaternionValue = SPEditorGUI.QuaternionField(r1, GUIContent.none, variant.QuaternionValue);
                    break;

                case VariantType.Color:
                    variant.ColorValue = EditorGUI.ColorField(r1, variant.ColorValue);
                    break;

                case VariantType.DateTime:
                    variant.DateValue = ConvertUtil.ToDate(EditorGUI.TextField(r1, variant.DateValue.ToString()));
                    break;

                case VariantType.GameObject:
                    variant.GameObjectValue = EditorGUI.ObjectField(r1, variant.GameObjectValue, typeof(GameObject), true) as GameObject;
                    break;

                case VariantType.Component:
                {
                    _selectComponentDrawer.AllowNonComponents = false;
                    _selectComponentDrawer.RestrictionType    = ComponentUtil.IsAcceptableComponentType(_forcedObjectType) ? _forcedObjectType : typeof(Component);
                    _selectComponentDrawer.ShowXButton        = true;
                    var targProp = property.FindPropertyRelative(PROP_OBJREF);
                    EditorGUI.BeginChangeCheck();
                    _selectComponentDrawer.OnGUI(r1, targProp);
                    if (EditorGUI.EndChangeCheck())
                    {
                        variant.ComponentValue = targProp.objectReferenceValue as Component;
                    }
                }
                break;

                case VariantType.Object:
                {
                    var obj = variant.ObjectValue;
                    if (ComponentUtil.IsAcceptableComponentType(_forcedObjectType))
                    {
                        if (obj is GameObject || obj is Component)
                        {
                            _selectComponentDrawer.AllowNonComponents = false;
                            _selectComponentDrawer.RestrictionType    = _forcedObjectType;
                            _selectComponentDrawer.ShowXButton        = true;
                            var targProp = property.FindPropertyRelative(PROP_OBJREF);
                            EditorGUI.BeginChangeCheck();
                            _selectComponentDrawer.OnGUI(r1, targProp);
                            if (EditorGUI.EndChangeCheck())
                            {
                                variant.ObjectValue = targProp.objectReferenceValue as Component;
                            }
                        }
                        else
                        {
                            EditorGUI.BeginChangeCheck();
                            obj = EditorGUI.ObjectField(r1, obj, typeof(UnityEngine.Object), true);
                            if (EditorGUI.EndChangeCheck())
                            {
                                if (obj == null)
                                {
                                    variant.ObjectValue = null;
                                }
                                else if (_forcedObjectType.IsInstanceOfType(obj))
                                {
                                    variant.ObjectValue = obj;
                                }
                                else
                                {
                                    var go = GameObjectUtil.GetGameObjectFromSource(obj);
                                    if (go != null)
                                    {
                                        variant.ObjectValue = go.GetComponent(_forcedObjectType);
                                    }
                                    else
                                    {
                                        variant.ObjectValue = null;
                                    }
                                }
                            }
                        }
                    }
                    else
                    {
                        variant.ObjectValue = EditorGUI.ObjectField(r1, obj, _forcedObjectType, true);
                    }
                }
                break;

                case VariantType.LayerMask:
                {
                    variant.LayerMaskValue = SPEditorGUI.LayerMaskField(r1, GUIContent.none, (int)variant.LayerMaskValue);
                }
                break;

                case VariantType.Rect:
                {
                    variant.RectValue = EditorGUI.RectField(r1, variant.RectValue);
                }
                break;

                case VariantType.Numeric:
                {
                    //we just treat numeric types as double and let the numeric deal with it
                    var tp = this.TypeRestrictedTo;
                    if (tp != null && typeof(INumeric).IsAssignableFrom(tp))
                    {
                        var    n = variant.NumericValue;
                        double d = n != null?n.ToDouble(null) : 0d;

                        EditorGUI.BeginChangeCheck();
                        d = EditorGUI.DoubleField(r1, d);
                        if (EditorGUI.EndChangeCheck())
                        {
                            variant.NumericValue = Numerics.CreateNumeric(tp, d);
                        }
                    }
                    else
                    {
                        variant.DoubleValue = EditorGUI.DoubleField(r1, variant.DoubleValue);
                    }
                }
                break;
                }
            }
        }