Sending a file name to a qt tabWidget from main window's menu

Question

I am using qt to build a file editor with multiple tabs, each tab corresponds to a single file. In mainwindow.cpp I have the function:

    void MainWindow::on_actionOpen_triggered()
    {

        QString fileName = QFileDialog::getOpenFileName(this,"Open File","/home",tr("*.ext"));
    }

and I need to send fileName to a new tab for my tab widget. I know there are signals and slots for classes in qt but I can't for the life of me figure out how to send the QString to a specific tab. Is there some way of sending the filename to the tab's creation event, or possibly use the tab's index for sending it a signal?

I am very new to qt but I'm fairly sure this should be a simple process. I just cannot figure it out.

Thanks in advance!

Edit: full modified code with both as members of mainwindow:

void MainWindow::on_actionOpen_triggered()
    {
    if (fileName!=NULL)
        {
        int curtab=ui->fileTabWidget->addTab(new my_editor,tr("editor"));
        ui->fileTabWidget->setCurrentIndex(curtab);
        }
    }

So following @vizhanyolajos instructions; if I pass the filename to the end of addTab, where do I need to add the rest of the code for recieving it?

I'm assuming in my custom editor class.

Answer 1

Your code could look something like this for example:

void MainWindow::on_actionOpen_triggered()
{
    QString fileName = QFileDialog::getOpenFileName(this,"Open File","/home",tr("*.ext"));

    createNewPage( index , name , fileName );
}


createNewPage( int index , QString name , QString fileName )
{
    // your page creation code goes here
    // your fileOpen and fill textBox code goes here where you can use the fileName for it
}

I would recommend you store your pageIndex + fileName in a container so you can easily query which page corresponds to which file.

---

void MainWindow::on_actionOpen_triggered()
{
    QString fileName = QFileDialog::getOpenFileName(this,"Open File","/home",tr("*.ext"));

    if (fileName!=NULL)
    {
        ui->fileTabWidget->addTab(new my_editor( fileName ),tr("editor"));
        ui->fileTabWidget->setCurrentIndex(curtab);
    }
 }

Just pass the fileName to the constructor of your my_editor Widget.
In there you can call your function for filling your editor with the fileName then.

Answer 2

There is no tab creation event. You need to do the following steps, and I think you don't need any SIGNAL/SLOT mechanism for this. I think that the SLOT what you included in your question is a member function of you QMainWindow. And I think your QTabWidget is also part of your QMainWindow so you only need to do this:

void onActionTriggered()
{
    const QString filename = // ...

    ui.TabWidget->addTab( /* Your custom class derived from QWidget or a Qt widget */, filename );
}