Figuring out which menu item was triggered in Qt

Question

In a Qt application, I have a bunch of automatically-created QActions (menu items) that I add to a menu in the menu bar. Each opens a different file. I'd like to connect them all to the same slot so as to not write the same code many times. From that slot, though, how do I figure out which of the QActions was triggered?

(Example: In Cocoa I'd do this with the sender parameter in the action selector.)

Thanks!

Answer 1

In Qt, you also have access to the sender: QObject::sender.

Answer 2

You have two options:

• Call sender() in the slot, which will return the action that triggered the signal.
• Use QSignalMapper.

Answer 3

I would connect to the QMenu's "triggered" signal, rather then each QAction. This gives you the QAction that was clicked as the first parameter.

void MyObject::menuSelection(QAction* action)
{
  qDebug() << "Triggered: " << action->text();
} 

void MyObject::showMenu(QPoint menuPos)
{
  QMenu menu;
  menu.addAction( "File A" );
  menu.addAction( "File B" );
  menu.addAction( "File C" );
  connect(&menu, SIGNAL(triggered(QAction*)), this, SLOT(menuSelection(QAction*)));
  menu.exec(menuPos);
}