Pyqt Listview Checkbox Connect When Checked/unchecked

I can figure out how to check if all checkboxes are checked, by iterating over a QListView, like explained here But is there a way to connect to a function, right at the time of ch

Solution 1:

For this case we can use a delegate to detect the change of state, another solution is to use the model but this would be more annoying to implement since each model would have to be modified. The solution is the next

import sys

from PyQt5 import QtCore, QtGui, QtWidgets


class Delegate(QtWidgets.QStyledItemDelegate):
    def editorEvent(self, event, model, option, index):
        checked = index.data(QtCore.Qt.CheckStateRole)
        ret = QtWidgets.QStyledItemDelegate.editorEvent(self, event, model, option, index)
        if checked != index.data(QtCore.Qt.CheckStateRole):
            self.parent().checked.emit(index)
        return ret


class ListView(QtWidgets.QListView):
    checked = QtCore.pyqtSignal(QtCore.QModelIndex)
    def __init__(self, *args, **kwargs):
        super(ListView, self).__init__(*args, **kwargs)
        self.setItemDelegate(Delegate(self))


class AppRemovalPage(QtWidgets.QWizardPage):
    def __init__( self, parent=None):
        super(AppRemovalPage, self).__init__(parent)
        self.setTitle('Apps to Remove')
        self.setSubTitle('Listview')
        self.list_view = ListView(self)
        self.list_view.setMinimumSize(465, 200)

        self.model = QtGui.QStandardItemModel(self)
        for line in ('a', 'b', 'c', 'd', 'e'):
            self.item = QtGui.QStandardItem(line)
            self.item.setCheckable(True)
            self.item.setCheckState(QtCore.Qt.Unchecked)
            self.model.appendRow(self.item)

        self.list_view.setModel(self.model)
        self.list_view.checked.connect(self.onChecked)

    @QtCore.pyqtSlot(QtCore.QModelIndex)
    def onChecked(self, index):
        item = self.model.itemFromIndex(index)
        if item.checkState() == QtCore.Qt.Checked:
            print(item.text(), "was checked")
        else:
            print(item.text(), "was unchecked")

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