QDialog get parent info

[bandito]

My program has to QListwidgets. When I right click on the list I have a QDialog popup. When the QDialog pops up I would like to know which QListWidget has opened it. I tried using this line of code
qDebug()<<QDialog->parentWidget()->objectName();
but it crashed my program.

Here is some code from my .cpp file.

(this is in the main function/constructor)

lists = new QTabWidget;
    lists->setFixedWidth(200);
    etfList = new QListWidget;
    ipoList = new QListWidget;
    etfList->setObjectName("ETFList");
    etfList->setContextMenuPolicy(Qt::CustomContextMenu);
    ipoList->setObjectName("IPOList");
    ipoList->setContextMenuPolicy(Qt::CustomContextMenu);
    lists->addTab(etfList, "ETF List");
    lists->addTab(ipoList, "IPO List");
 
 
    connect(etfList, SIGNAL(customContextMenuRequested(const QPoint &)), this,SLOT(menuPopup(const QPoint &)));
    connect(ipoList, SIGNAL(customContextMenuRequested(const QPoint &)), this,SLOT(menuPopup(const QPoint &)));

(this is the slot)

void MainWindow::menuPopup(const QPoint &point){
 
    QDialog *dia = new QDialog();
    qDebug()<<dia->parentWidget()->objectName();  <---crashes on this line
    dia->show();
}
}

And in my header file:

class MainWindow : public QMainWindow
{
    Q_OBJECT
    QTabWidget *lists;
    QListWidget *etfList;
    QListWidget *ipoList;
 
public:
    explicit MainWindow(QWidget *parent = 0);
 
    ~MainWindow();
 
signals:
 
private slots:
    void menuPopup(const QPoint &point);

[raven-worx]

@bandito
it crashes because you didn't set a parent on the dialog.
But trying to access it's parent pointer, which returns NULL but you calling objectName() on it.
So simply set a parent widget. E.g. when creating the dialog.

[SGaist]

Hi and welcome to devnet,

The usual way to get to know where the signal came from is to call sender.

[bandito]

@SGaist Thanks devnet. QObject::sender does the job!

[SGaist]

You're welcome !

Since you have it working now, please mark the thread as solved using the "Topic Tools" button so that other forum users may know a solution has been found :)