Pyqt5 Refresh/update Qlistwidget Based On Event In Custom Widget?

I am trying to update/refresh a QListWidget after I click a button in a CustomFormWidget. What I am trying to do is when I click the button in a CustomFormWidget, it updates the

Solution 1:

In this case it is better that each item manages its data, for this we can pass the QListWidget to the custom widget and in it handle through roles. In the following example, each widget modifies its data, and when the application is closed, the updated data is printed:

class Roles:
    IdRole = QtCore.Qt.UserRole + 1000
    NameRole = QtCore.Qt.UserRole + 1001
    VersionRole = QtCore.Qt.UserRole + 1002
    InstalledRole = QtCore.Qt.UserRole + 1003

class ParentWid(QtWidgets.QDialog, Ui_ParentWidget):
    def __init__(self, data={}, parent=None):
        super(ParentWid, self).__init__(parent)
        self.data = data
        self.setupUi(self)
        self.set_widget_data()

    def set_widget_data(self):
        for item in self.data:
            lst_item = QtWidgets.QListWidgetItem()
            self.listWidget.addItem(lst_item)
            custFormItem = CustomFormWidget(item, lst_item)
            lst_item.setSizeHint(custFormItem.sizeHint())

    def print_results(self):
        v = (("id", Roles.IdRole), ("name", Roles.NameRole), ("version", Roles.VersionRole), ("installed", Roles.InstalledRole),)
        results = []
        for i in range(self.listWidget.count()):
            it = self.listWidget.item(i)
            d = {}
            for k, r in v:
                d[k] = it.data(r)
            results.append(d)
        print(results)

    # test
    def closeEvent(self, event):
        self.print_results()
        super(ParentWid, self).closeEvent(event)

class CustomFormWidget(QtWidgets.QWidget, Ui_Form):
    def __init__(self, data, item, parent=None):
        super(CustomFormWidget, self).__init__(parent)
        self._item = item
        self._item.listWidget().setItemWidget(self._item, self)
        self.setupUi(self)
        v = (("id", Roles.IdRole), ("name", Roles.NameRole), ("version", Roles.VersionRole), ("installed", Roles.InstalledRole),)
        for k, r in v:
            self._item.setData(r, data[k])
        self.update_view()
        self.install_btn.clicked.connect(self.on_click)

    def update_view(self):
        self.pkg_name.setText(self._item.data(Roles.NameRole))
        self.pkg_version.setText(self._item.data(Roles.VersionRole))
        v = self._item.data(Roles.InstalledRole)
        self.install_btn.setText("Installed" if v else "Not Installed")
        self.install_btn.setEnabled(not v)

    @QtCore.pyqtSlot()
    def on_click(self):
        self._item.setData(Roles.InstalledRole, not self._item.data(Roles.InstalledRole))
        self.update_view()

        v = (("id", Roles.IdRole), ("name", Roles.NameRole), ("version", Roles.VersionRole), ("installed", Roles.InstalledRole),)
        for k, r in v:
            print(k, self._item.data(r))


if __name__ == '__main__':
    import sys
    app = QtWidgets.QApplication(sys.argv)

    data = [
        {
            'id': 1,
            'name': 'pkg-foo',
            'version': '0.1',
            'installed': False
        },
        {
            'id': 2,
            'name': 'pkg-bar',
            'version': '0.1',
            'installed': False
        }
    ]
    w = ParentWid(data)
    w.show()
    sys.exit(app.exec_())