QAction with custom parameter

Question

I want to execute my slot with parameter when dynamically created QAction clicked, but I can't add my variables when creating QAction in QMenu, and default triggered() slot can't pass it.

To be more clear, I want to archieve something like this:

connect(someAction, SIGNAL( triggered(MyClass*) ), this, SLOT( execute(MyClass*) );

How I can get this? I tried to create custom QAction, but I don't know how to add it to QMenu - there is no function like addAction(QAction).

Answer 1

You can store your parameter in the action itself as a QVariant using QAction::setData() function. For example:

QVariant v = qVariantFromValue((void *) yourClassObjPointer);
action->setData(v);

In the slot you will have to extract the pointer like:

void execute()
{
    QAction *act = qobject_cast<QAction *>(sender());
    QVariant v = act->data();
    YourClass yourPointer = (YourClass *) v.value<void *>();
}

Answer 2

1. Gather your dynamic QAction's in one QActionGroup using QAction::setActionGroup()

2. Use QAction::setData() to store the custom data in each QAction.

3. connect QActionData's signal triggered(QAction*) to some slot.