Added subclass of QListWidgetItem to store pathlib.Path() objects directly.

sohstationviewer/view/mainwindow.py

 import os
 import sys
 import pathlib
-from functools import partial
 from PySide2 import QtCore, QtGui, QtWidgets
 from sohstationviewer.view.ui.main_ui import Ui_MainWindow
 from sohstationviewer.view.calendardialog import CalendarDialog
 from sohstationviewer.view.ui.calendarwidget import CalendarWidget
+from sohstationviewer.view.ui.filelist import FileListItem
 
 class MainWindow(QtWidgets.QMainWindow, Ui_MainWindow):
     """
@@ -58,9 +58,12 @@ class MainWindow(QtWidgets.QMainWindow, Ui_MainWindow):
         self.dateGroup.addAction(self.showYYYYDOYDates)
         self.dateGroup.addAction(self.showYYYY_MM_DDDates)
         self.dateGroup.addAction(self.showYYYYMMMDDDates)
-        self.showYYYYDOYDates.setChecked(True)
+        # self.showYYYYDOYDates.setChecked(True)
+        self.showYYYY_MM_DDDates.setChecked(True)
 
-        self.showYYYYDOYDates.triggered.connect(lambda: self.setDateFormat('yyyy:D'))
+        # Connect slots to change the date format displayed
+        # by the QDateEdit widgets
+        # self.showYYYYDOYDates.triggered.connect(lambda: self.setDateFormat('yyyy:D'))
         self.showYYYY_MM_DDDates.triggered.connect(lambda: self.setDateFormat('yyyy-MM-dd'))
         self.showYYYYMMMDDDates.triggered.connect(lambda: self.setDateFormat('yyyyMMMdd'))
 
@@ -70,7 +73,15 @@ class MainWindow(QtWidgets.QMainWindow, Ui_MainWindow):
         self.timeFromDateEdit.setCalendarWidget(CalendarWidget(self))
         self.timeFromDateEdit.setDate(QtCore.QDate.currentDate())
 
-        self.showYYYYDOYDates.triggered.emit()
+        # self.showYYYYDOYDates.triggered.emit()
+        self.showYYYY_MM_DDDates.triggered.emit()
+
+        self.openFilesList.itemDoubleClicked.connect(self.openFilesListItemDoubleClicked)
+
+        pal = self.openFilesList.palette()
+        pal.setColor(QtGui.QPalette.Highlight, QtGui.QColor(128, 255, 128))
+        pal.setColor(QtGui.QPalette.HighlightedText, QtGui.QColor(0, 0, 0))
+        self.openFilesList.setPalette(pal)
 
     @QtCore.Slot()
     def deleteSetupFile(self):
@@ -112,6 +123,10 @@ class MainWindow(QtWidgets.QMainWindow, Ui_MainWindow):
     def readSelectedFile(self):
         print('Reading currently selected file.')
 
+        # TODO: Launch a separate thread, so that
+        # the UI doesn't hang while data is being read.
+        # Otherwise, the user won't be able to cancel.
+
     @QtCore.Slot()
     def stopFileRead(self):
         print('Abandoning file read.')
@@ -124,14 +139,26 @@ class MainWindow(QtWidgets.QMainWindow, Ui_MainWindow):
     def reloadFile(self):
         print('Reloading last file.')
 
+    @QtCore.Slot()
+    def openFilesListItemDoubleClicked(self, item):
+        print(f'Opening {item.text()}')
+
+        # Do something with the Path object,
+        # i.e., path.open(), or path.iterdir() ...
+        path = item.filePath
+
     @QtCore.Slot()
     def setDateFormat(self, displayFormat):
         self.timeToDateEdit.setDisplayFormat(displayFormat)
         self.timeFromDateEdit.setDisplayFormat(displayFormat)
 
     def setCurrentDirectory(self, path=''):
+        # Remove entries when cwd changes
+        self.openFilesList.clear()
+        # Signal cwd changed, and gather list of files in new cwd
         self.currentDirectoryChanged.emit(path)
-        self.openFilesList.addItems([dent.name for dent in pathlib.Path(path).iterdir()])
+        for dent in pathlib.Path(path).iterdir():
+            self.openFilesList.addItem(FileListItem(dent))
 
     @QtCore.Slot(str)
     def changeCurrentDirectory(self, path=''):
@@ -146,6 +173,7 @@ class MainWindow(QtWidgets.QMainWindow, Ui_MainWindow):
         calendar = CalendarDialog(self)
         calendar.show()
 
+
 if __name__ == '__main__':
     app = QtWidgets.QApplication(sys.argv)
     wnd = MainWindow()

sohstationviewer/view/ui/filelist.py

+from PySide2 import QtCore, QtGui, QtWidgets
+
+
+class FileListItem(QtWidgets.QListWidgetItem):
+
+    def __init__(self, filePath, parent=None):
+        super().__init__(filePath.name, parent, type=QtWidgets.QListWidgetItem.UserType)
+        self.filePath = filePath