QTreeView File Explorer

# -*- coding: utf-8 -*-
"""
Author: Administrator
Date: 2020/5/6 22:01
"""

from PySide2 import QtCore
from PySide2 import QtWidgets
from shiboken2 import wrapInstance

import maya.OpenMayaUI as omui
import maya.cmds as cmds
import maya.mel as mel

def maya_main_window():
    """
    Return the Maya main window widget as a Python object
    """
    main_window_ptr = omui.MQtUtil.mainWindow()
    return wrapInstance(long(main_window_ptr), QtWidgets.QWidget)

class TreeViewDialog(QtWidgets.QDialog):
    WINDOW_TITLE = "Tree View"
    dlg_instance = None
    def __init__(self, parent=maya_main_window()):
        super(TreeViewDialog, self).__init__(parent)

        self.setWindowTitle(self.WINDOW_TITLE)
        self.setMinimumSize(600, 400)
        self.setWindowFlags(self.windowFlags() ^ QtCore.Qt.WindowContextHelpButtonHint)

        self.create_widgets()
        self.create_layout()
        self.create_connections()

    def create_widgets(self):
        root_path = "{0}scripts".format(cmds.internalVar(userAppDir=True))

        self.model = QtWidgets.QFileSystemModel()
        self.model.setRootPath(root_path)

        self.tree_view = QtWidgets.QTreeView()
        self.tree_view.setModel(self.model)
        self.tree_view.setRootIndex(self.model.index(root_path))
        self.tree_view.hideColumn(1)
        self.tree_view.setColumnWidth(0, 240)

        # self.model.setFilter(QtCore.QDir.Dirs | QtCore.QDir.NoDotAndDotDot)
        self.model.setNameFilters(["*.py", "*.mel"])
        self.model.setNameFilterDisables(False)

    def create_layout(self):
        main_layout = QtWidgets.QVBoxLayout(self)
        main_layout.setContentsMargins(2, 2, 2, 2)
        main_layout.addWidget(self.tree_view)

    def create_connections(self):
        self.tree_view.doubleClicked.connect(self.on_double_clicked)

    def on_double_clicked(self, index):
        path = self.model.filePath(index)

        if self.model.isDir(index):
            print("Directory selected: {0}".format(path))
        else:
            print("File selected: {0}".format(path))
    
    @classmethod
    def showWindow(cls):
        if not cls.dlg_instance:
            cls.dlg_instance = TreeViewDialog()

        if cls.dlg_instance.isHidden():
            cls.dlg_instance.show()
        else:
            cls.dlg_instance.raise_()
            cls.dlg_instance.activateWindow()

if __name__ == "__main__":
    try:
        dialog.close()
        dialog.deleteLater()
    except:
        pass

    dialog = TreeViewDialog()
    dialog.show()