Saving and restoring selection in QListView

Question

Having a QListView wants to save and restore the selection in QListView. When Okay button clicks, selected item saves and when it runs again, restores the selected item and display? How to achieve that?

Display

The code

import sys
from PyQt5 import QtCore, QtGui, QtWidgets
class Widget(QtWidgets.QDialog):
    def __init__(self, parent=None):
        super(Widget, self).__init__(parent)
        self.setFont(QtGui.QFont("Helvetica", 8, QtGui.QFont.Normal, italic=False))
        self.setWindowTitle("Getting selected item")        
        lay = QtWidgets.QVBoxLayout(self)
        self.button = QtWidgets.QPushButton("Okay")
        self.button.clicked.connect(self.on_click_ok)
        self.listView = QtWidgets.QListView(editTriggers=QtWidgets.QAbstractItemView.NoEditTriggers,
            selectionMode=QtWidgets.QAbstractItemView.SingleSelection,
            selectionBehavior=QtWidgets.QAbstractItemView.SelectRows,)
        lay.setContentsMargins(10,10,10,10)
        lay.addWidget(self.listView)

        self.entry = QtGui.QStandardItemModel()
        self.listView.setModel(self.entry) 
        self.listView.setSpacing(4)
        self.listView.setFont(QtGui.QFont("Helvetica",9, QtGui.QFont.Normal, italic=False))
        self.listView.setUniformItemSizes(True)
        self.listView.setFixedSize(300, 150)

        for i, text in enumerate(["Itemname1", "Itemname2", "Itemname3", "Itemname4", "Itemname5"]):
            it = QtGui.QStandardItem(text)
            self.entry.appendRow(it)

        self.listView.selectionModel().currentChanged.connect(self.on_row_changed)    

        selection = self.listView.selectionModel().selectedRows()

        ix = self.entry.index(0, 0)
        sm = self.listView.selectionModel()
        sm.select(ix, QtCore.QItemSelectionModel.Select)

        Code_Group = QtWidgets.QGroupBox(self)
        Code_Group.setTitle("&Selecting and deselecting")
        Code_Group.setLayout(lay)

        Vlay = QtWidgets.QVBoxLayout(self)
        Vlay.addWidget(Code_Group)
        Vlay.addWidget(self.button, alignment=QtCore.Qt.AlignCenter)
        Vlay.setSizeConstraint(Vlay.SetFixedSize)

        self.setWindowFlag(QtCore.Qt.WindowMaximizeButtonHint, True)

        self._INDEX = 0
        self.SELECTED = self.listView.selectedIndexes()
        print(self.SELECTED)

    def on_row_changed(self, current, previous):
        self._INDEX = current.row()
        print('Row %d selected' % current.row())

    def on_click_ok(self):
        print('Row index:', self._INDEX, 'After:')
        self.accept()

    def closeEvent(self,event):
        super(Widget, self).closeEvent(event)     


if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)
    w = Widget()
    w.show()
    sys.exit(app.exec_())

Answer 1

Considering my previous answer I have implemented a similar logic where the items are saved using QDataStream, and save the selected rows to then restore it.

import sys
from PyQt5 import QtCore, QtGui, QtWidgets


class Widget(QtWidgets.QDialog):
    def __init__(self, parent=None):
        super(Widget, self).__init__(parent)
        self.setFont(QtGui.QFont("Helvetica", 8, QtGui.QFont.Normal, italic=False))
        self.setWindowTitle("Getting selected item")
        lay = QtWidgets.QVBoxLayout(self)
        self.button = QtWidgets.QPushButton("Okay")
        self.button.clicked.connect(self.accept)
        self.listView = QtWidgets.QListView()
        lay.setContentsMargins(10, 10, 10, 10)
        lay.addWidget(self.listView)

        self.entry = QtGui.QStandardItemModel()
        self.listView.setModel(self.entry)
        self.listView.setSpacing(4)
        self.listView.setFont(
            QtGui.QFont("Helvetica", 9, QtGui.QFont.Normal, italic=False)
        )
        self.listView.setUniformItemSizes(True)
        self.listView.setFixedSize(300, 150)

        Code_Group = QtWidgets.QGroupBox()
        Code_Group.setTitle("&Selecting and deselecting")
        Code_Group.setLayout(lay)

        Vlay = QtWidgets.QVBoxLayout(self)
        Vlay.addWidget(Code_Group)
        Vlay.addWidget(self.button, alignment=QtCore.Qt.AlignCenter)
        Vlay.setSizeConstraint(Vlay.SetFixedSize)

        self.setWindowFlag(QtCore.Qt.WindowMaximizeButtonHint, True)
        self.read_settings()

        self.accepted.connect(self.write_settings)

    def closeEvent(self, event):
        print("closeEvent")
        self.write_settings()
        super(Widget, self).closeEvent(event)

    def read_settings(self):
        settings = QtCore.QSettings("file.ini", QtCore.QSettings.IniFormat)
        settings.beginGroup("listView")
        model = self.listView.model()
        if settings.contains("items"):

            editTriggers = settings.value(
                "editTriggers", type=QtWidgets.QAbstractItemView.EditTriggers
            )
            selectionMode = settings.value(
                "selectionMode", type=QtWidgets.QAbstractItemView.SelectionMode
            )
            selectionBehavior = settings.value(
                "selectionBehavior", type=QtWidgets.QAbstractItemView.SelectionBehavior
            )
            self.listView.setEditTriggers(editTriggers)
            self.listView.setSelectionMode(selectionMode)
            self.listView.setSelectionBehavior(selectionBehavior)

            items = settings.value("items", type=QtCore.QByteArray)
            stream = QtCore.QDataStream(items, QtCore.QIODevice.ReadOnly)
            while not stream.atEnd():
                it = QtGui.QStandardItem()
                stream >> it
                model.appendRow(it)
            selecteditems = settings.value("selecteditems", type=list)
            for row in selecteditems:
                index = model.index(row, 0)
                self.listView.selectionModel().select(
                    index, QtCore.QItemSelectionModel.Select
                )
        else:
            for text in [
                "Itemname1",
                "Itemname2",
                "Itemname3",
                "Itemname4",
                "Itemname5",
            ]:
                it = QtGui.QStandardItem(text)
                model.appendRow(it)
                self.listView.setEditTriggers(
                    QtWidgets.QAbstractItemView.NoEditTriggers
                )
                self.listView.setSelectionMode(
                    QtWidgets.QAbstractItemView.SingleSelection
                )
                self.listView.setSelectionBehavior(
                    QtWidgets.QAbstractItemView.SelectRows
                )
        settings.endGroup()

    def write_settings(self):
        settings = QtCore.QSettings("file.ini", QtCore.QSettings.IniFormat)
        settings.beginGroup("listView")
        model = self.listView.model()

        settings.setValue("editTriggers", self.listView.editTriggers())
        settings.setValue("selectionMode", self.listView.selectionMode())
        settings.setValue("selectionBehavior", self.listView.selectionBehavior())

        items = QtCore.QByteArray()
        stream = QtCore.QDataStream(items, QtCore.QIODevice.WriteOnly)
        for i in range(model.rowCount()):
            it = model.item(i)
            stream << it
        settings.setValue("items", items)

        selecteditems = []
        for index in self.listView.selectionModel().selectedRows():
            selecteditems.append(index.row())
        settings.setValue("selecteditems", selecteditems)

        settings.endGroup()


if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)
    w = Widget()
    w.show()
    sys.exit(app.exec_())