Call method in QMainWindow from QDialog
I am running this to show a dialog window from main:
void SQLWindow::on_action_4_triggered()
{
HeaderList window;
window.show();
window.exec();
}
Here I am trying to connect a saveButtonClicked() to the SLOT in the Main Window:
HeaderList::HeaderList(QWidget *parent) : QDialog(parent), ui(new Ui::HeaderList)
{
connect(this, SIGNAL(saveButtonClicked()), SQLWindow, SLOT(hideColumns()));
ui->setupUi(this);
}
but getting an error: "expected primary-expression before ',' token" which points at "SQLWindow". I am doing this wrong, obviously. Any ideas how to call a method in Main Window from Dialog?
The third parameter in connect(...) needs to be a pointer to an instance. Just change the signature of your HeaderList's constructor and add the SQLWindow as parameter (+ use the newer connect method call as TheDarkKnight mentioned):
HeaderList::HeaderList(SQLWindow *parent) : QDialog(parent), ui(new Ui::HeaderList)
{
connect(this, &HeaderList::saveButtonClicked, parent, &SQLWindow::hideColumns);
ui->setupUi(this);
}
In the header file, it would be a good idea to make the HeaderList constructor explicit and not overload parent with nullptr:
class HeaderList
{
public:
explicit HeaderList(SQLWindow *parent);
//...
};
Pass the SQLWindow to your HeaderList (and omit show() as thuga mentioned):
void SQLWindow::on_action_4_triggered()
{
HeaderList window(this);
window.exec();
}
connect the signal other way round like this:
class HeaderList
{
public:
explicit HeaderList(QWidget *parent);
signals:
void saveButtonClicked();
};
now in SQLWindow
void SQLWindow::on_action_4_triggered()
{
HeaderList window;
connect(&window, SIGNAL(saveButtonClicked()), this, SLOT(hideColumns()));
window.exec();
}