QtWebPage - loadFinished () called several times

Question

In my application, I have a list view. Selecting another element in it raises an event:

connect(listView->selectionModel(), SIGNAL(currentChanged(const QModelIndex &, const QModelIndex &)), this, SLOT(item_changed(const QModelIndex &, const QModelIndex &)));

void MainWindow::item_changed(const QModelIndex & current, const QModelIndex & previous)
{
    qDebug() << "\n" << "item_changed(), caller: " << sender()->objectName();
    if (current.isValid())
    {
        /*
          not so important code
        */

        change_query(tokens.join("+"));
    }
}

This calls another slot - change_query ().

void MainWindow::change_query(QString newquery)
{
    qDebug() << "change_query(), caller: " << sender()->objectName();

    QUrl query (newquery);

    frame->load(query);

    connect(frame, SIGNAL(loadFinished(bool)), this, SLOT(loading_finished()));
}

And finally, when the page is fully loaded, it should call load_finished ()

void MainWindow::loading_finished()
{
    qDebug() << "loading_finished(), caller: " << sender()->objectName();
}

But, to my surprise, the conclusion:

item_changed(), caller:  "SelectionModel" 
change_query(), caller:  "SelectionModel"
loading_finished(), caller:  "frame" 

item_changed(), caller:  "SelectionModel" 
change_query(), caller:  "SelectionModel" 
loading_finished(), caller:  "frame" 
loading_finished(), caller:  "frame" 

item_changed(), caller:  "SelectionModel" 
change_query(), caller:  "SelectionModel" 
loading_finished(), caller:  "frame" 
loading_finished(), caller:  "frame" 
loading_finished(), caller:  "frame" 

item_changed(), caller:  "SelectionModel" 
change_query(), caller:  "SelectionModel" 
loading_finished(), caller:  "frame" 
loading_finished(), caller:  "frame" 
loading_finished(), caller:  "frame" 
loading_finished(), caller:  "frame" 

As you can see, every time I change my choice, another instance (?) Of WebFrame is created and loaded, or the page is loaded +1 times each cycle. I spent the last 2 hours figuring out where the problem is and I don’t see anything.

Answer 1

You should only connect signals to the slots once, possibly in the constructor.

On the contrary, you call

connect(frame, SIGNAL(loadFinished(bool)), this, SLOT(loading_finished()));

evety , . , , connect.