[enums] extract enums to separate file

nixview/data_models/tree_model.py

@@ -1,22 +1,16 @@
 import os
-import nixview.constants as cnst
 from PyQt5.QtCore import QAbstractItemModel, QModelIndex, Qt, QSize
 from PyQt5.QtGui import QIcon
 from PyQt5.QtWidgets import QTreeView, QTreeWidgetItem, QAbstractItemView, QHeaderView
-from enum import Enum
 
+import nixview.constants as cnst
 from nixview.util.file_handler import NodeType
 from nixview.util.descriptors import ItemDescriptor
+from nixview.util.enums import TreeType
 
 column_names = ['Name', 'Type', 'Value', 'Description', 'ID',]
 
 
-class TreeType(Enum):
-     Full = "full view"
-     Metadata = "metadata view"
-     Data = "data view"
-
-
 class NixTreeItem(QTreeWidgetItem):
     def __init__(self, node_descriptor, file_handler, parent=None):
         super().__init__(parent)