QListWidget, itemSelectionChanged problem

SPlatten

I have an instance of QListWidget, I've created an object based on this:

    class clsQtListWidget : public QListWidget, public clsXMLinterface {
    Q_OBJECT

I've connected all the available signals to internal slots which I call repeaters:

    private slots:
        void rptrCurrentItemChanged(QListWidgetItem* pobjCurrent
                                   ,QListWidgetItem* pobjPrevious);
        void rptrCurrentRowChanged(int intCurrentRow);
        void rptrCurrentTextChanged(const QString& crstrCurrentText);
        void rptrIndexesMoved(const QModelIndexList& crobjIndexes);
        void rptrItemActivated(QListWidgetItem* pobjItem);
        void rptrItemChanged(QListWidgetItem* pobjItem);
        void rptrItemClicked(QListWidgetItem* pobjItem);
        void rptrItemDoubleClicked(QListWidgetItem* pobjItem);
        void rptrItemEntered(QListWidgetItem* pobjItem);
        void rptrItemPressed(QListWidgetItem* pobjItem);
        void rptrItemSelectionChanged();

Connections in constructor:

    QMetaObject::Connection cn;
    cn = QObject::connect(this, &clsQtListWidget::currentItemChanged
                         ,this, &clsQtListWidget::rptrCurrentItemChanged);
    Q_ASSERT_X(cn, metaObject()->className()
        ,QString(clsXMLnode::mscszAssertCannotConnectToRepeater)
            .arg(clsQtListWidget::mscszQtSignalCurItemChgd)
                    .toLatin1().data());
    cn = QObject::connect(this, &clsQtListWidget::currentRowChanged
                         ,this, &clsQtListWidget::rptrCurrentRowChanged);
    Q_ASSERT_X(cn, metaObject()->className()
        ,QString(clsXMLnode::mscszAssertCannotConnectToRepeater)
            .arg(clsQtListWidget::mscszQtSignalCurRowChgd)
                    .toLatin1().data());
    cn = QObject::connect(this, &clsQtListWidget::currentTextChanged
                         ,this, &clsQtListWidget::rptrCurrentTextChanged);
    Q_ASSERT_X(cn, metaObject()->className()
        ,QString(clsXMLnode::mscszAssertCannotConnectToRepeater)
            .arg(clsQtListWidget::mscszQtSignalTextChgd)
                    .toLatin1().data());
    cn = QObject::connect(this, &clsQtListWidget::indexesMoved
                         ,this, &clsQtListWidget::rptrIndexesMoved);
    Q_ASSERT_X(cn, metaObject()->className()
        ,QString(clsXMLnode::mscszAssertCannotConnectToRepeater)
            .arg(clsQtListWidget::mscszQtSignalIndxesMoved)
                    .toLatin1().data());
    cn = QObject::connect(this, &clsQtListWidget::itemActivated
                         ,this, &clsQtListWidget::rptrItemActivated);
    Q_ASSERT_X(cn, metaObject()->className()
        ,QString(clsXMLnode::mscszAssertCannotConnectToRepeater)
            .arg(clsQtListWidget::mscszQtSignalItemActvd)
                    .toLatin1().data());
    cn = QObject::connect(this, &clsQtListWidget::itemChanged
                         ,this, &clsQtListWidget::rptrItemChanged);
    Q_ASSERT_X(cn, metaObject()->className()
        ,QString(clsXMLnode::mscszAssertCannotConnectToRepeater)
            .arg(clsQtListWidget::mscszQtSignalItemChgd)
                    .toLatin1().data());
    cn = QObject::connect(this, &clsQtListWidget::itemClicked
                         ,this, &clsQtListWidget::rptrItemClicked);
    Q_ASSERT_X(cn, metaObject()->className()
        ,QString(clsXMLnode::mscszAssertCannotConnectToRepeater)
            .arg(clsQtListWidget::mscszQtSignalItemClicked)
                    .toLatin1().data());
    cn = QObject::connect(this, &clsQtListWidget::itemDoubleClicked
                         ,this, &clsQtListWidget::rptrItemDoubleClicked);
    Q_ASSERT_X(cn, metaObject()->className()
        ,QString(clsXMLnode::mscszAssertCannotConnectToRepeater)
            .arg(clsQtListWidget::mscszQtSignalItemDblClicked)
                    .toLatin1().data());
    cn = QObject::connect(this, &clsQtListWidget::itemEntered
                         ,this, &clsQtListWidget::rptrItemEntered);
    Q_ASSERT_X(cn, metaObject()->className()
        ,QString(clsXMLnode::mscszAssertCannotConnectToRepeater)
            .arg(clsQtListWidget::mscszQtSignalItemEntered)
                    .toLatin1().data());
    cn = QObject::connect(this, &clsQtListWidget::itemPressed
                         ,this, &clsQtListWidget::rptrItemPressed);
    Q_ASSERT_X(cn, metaObject()->className()
        ,QString(clsXMLnode::mscszAssertCannotConnectToRepeater)
            .arg(clsQtListWidget::mscszQtSignalItemPressed)
                        .toLatin1().data());
QObject::connect(this, &clsQtListWidget::itemSelectionChanged
                 ,[]() {
    qdbg() << "Item Selection Changed!";
});
    cn = QObject::connect(this, &clsQtListWidget::itemSelectionChanged
                         ,this, &clsQtListWidget::rptrItemSelectionChanged);
    Q_ASSERT_X(cn, metaObject()->className()
        ,QString(clsXMLnode::mscszAssertCannotConnectToRepeater)
            .arg(clsQtListWidget::mscszQtSignalItemSelChgd)
                        .toLatin1().data());
    clsXMLnode* pobjWindow(mpobjNode->pobjGetWindow());
    if ( pobjWindow != nullptr ) {
        cn = QObject::connect(pobjWindow, &clsXMLnode::blankControls
                             ,this, &clsQtListWidget::blankControl);
        Q_ASSERT_X(cn, metaObject()->className()
                  ,QString(clsXMLnode::mscszAssertCannotConnect)
                    .arg(clsXMLnode::mscszSignalBlankControls)
                              .toLatin1().data());
    }

I added the lambda connect just to fault find:

QObject::connect(this, &clsQtListWidget::itemSelectionChanged
                 ,[]() {
    qdbg() << "Item Selection Changed!";
});

When a change the list selection I don't see this signal emitted in that neither the lambda or my repeater connected to the same signal do not get called. What could be the issue? I can see that currentItemChanged does occur.

Christian Ehrlicher

Works fine for me:

int main(int argc, char **argv)
{
  QApplication app(argc, argv);

  QListWidget w;
  w.addItem("Item 1");
  w.addItem("Item 2");
  w.addItem("Item 3");
  QObject::connect(&w, &QListWidget::itemSelectionChanged, [&]() { qDebug() << "Item Selection Changed!"; });
  w.show();

  return app.exec();
}

You're doing something in your code. Simplify it until the error no longer occurs or you can show us (and no - showing code with hundreds of unrelated connects is not a valid testcase where we can look on it.)

SPlatten

@Christian-Ehrlicher , Thank you, I will do just that.

SPlatten

@Christian-Ehrlicher , Found the issue, it works now after commenting out this from the constructor:

    //Use "clsQtAskBeforeChange" to prompt user for confirmation if
    //changes in child nodes before allowing change
    //ABC = Ask Before Change
    clsQtAskBeforeChange* pobjABC(new clsQtAskBeforeChange(model(), this));
    setSelectionMode(QAbstractItemView::ExtendedSelection);
    setSelectionModel(pobjABC);
    //Now the widget should be set-up, finalise set-up
    clsXMLinterface::setup();

This is a bit of a work in progress as I want to prompt the user for confirmation before allowing the new selection.