from PySide2 import QtCore, QtGui, QtWidgets

import os

file = 'template'
path_dir = r'D:templates'

class Ui_Form(object):

    def setupUi(self, Form):
        Form.setObjectName("Form")
        Form.resize(1266, 798)
        self.treeView = QtWidgets.QTreeView(Form)
        self.treeView.setGeometry(QtCore.QRect(40, 70, 611, 241))
        self.treeView.setObjectName("treeView")
        #-------------
# ?     self.treeView.QFileSystemModel.directoryLoaded('D:testqt')
        #-------------
        self.pushButton = QtWidgets.QPushButton(Form)
        self.pushButton.setGeometry(QtCore.QRect(670, 70, 131, 41))
        self.pushButton.setObjectName("pushButton")
        self.pushButton.clicked.connect(self.save_file)

        self.label = QtWidgets.QLabel(Form)
        self.label.setGeometry(QtCore.QRect(40, 42, 541, 21))
        self.label.setObjectName("label")

        self.retranslateUi(Form)
        QtCore.QMetaObject.connectSlotsByName(Form)

    def retranslateUi(self, Form):
        Form.setWindowTitle(QtWidgets.QApplication.translate("Form", "Form", None, -1))
        self.pushButton.setText(QtWidgets.QApplication.translate("Form", "PushButton", None, -1))
        self.label.setText(QtWidgets.QApplication.translate("Form", "TextLabel", None, -1))

    def save_file(self):
        print('File', file , 'saved in: ' , path_dir, '!')


class Widget(QtWidgets.QWidget, Ui_Form):
    def __init__(self, parent=None):
        super(Widget, self).__init__(parent)

        self.setupUi(self)

        self.resize(1266, 798)
        layout = QtWidgets.QHBoxLayout(self)
        # layout.addWidget(self.label)
        # layout.addWidget(self.treeView)
        # layout.addWidget(self.pushButton)
        self.model = QtWidgets.QFileSystemModel()
        self.model.setFilter(QtCore.QDir.AllEntries | QtCore.QDir.Hidden | QtCore.QDir.NoDot)
        self.path = os.path.expanduser('D:')                          # <-- ('D:/test/qt')
        self.parentIndex  = self.model.setRootPath(self.path)
        self.treeView.setModel(self.model)
        self.treeView.setRootIndex(self.model.index(self.path))
        self.model.directoryLoaded.connect(self._loaded)

        self.dirictory = QtWidgets.QDirModel()
        self.dirictory.index(self.path)
        self.dirictory.filePath(self.dirictory.index(self.path))
        print(self.dirictory.filePath(self.dirictory.index(self.path)))



    def _loaded(self, path):
        print('_loaded', self.path)
        print('++loaded', self.dirictory.filePath(self.dirictory.index(self.path)))


if __name__ == "__main__":
   import sys
   app = QtWidgets.QApplication(sys.argv)
#   Form = QtWidgets.QWidget()
#   ui = Ui_Form()
#   ui.setupUi(Form)
#   Form.show()
   w = Widget()
   w.show()
   sys.exit(app.exec_())