How to use QSignalMapper for a list of QAction items

I am developing a code snippet to perform similar, not identical actions when I click on the sub menu item list. Please check the attached snapshot. QSignalMapper is the best solution to connect multiple signals to the same slot.
Attachment 10094

But I am not able to exactly place, which signal is to be called for which slot. I have read a lot of theory about QSignalMapper,

Code:

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http://qt-project.org/doc/qt-4.8/qsignalmapper.html
http://doc.qt.digia.com/qq/qq10-signalmapper.html#thesignalmapperapproach

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even implemented their codes. Unlike the mentioned sample programs, my QAction objects apparently cannot be defined like we define elements inside an array, coz their names were auto-generated by the design window.
Attachment 10095

I am not able to understand, what should I place as SIGNAL here, and when should I use the setMapping function? If I use setMapping function, which parameters should I implement? I am simply not getting the concept thorough, not knowing what to do, whom to ask and making the mistake in my code here. Can you please advise me what I am doing wrong? I checked this for reference coz he had similar issue:

Code:

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http://stackoverflow.com/questions/14151443/how-to-pass-a-qstring-to-a-qt-slot-from-a-qmenu-via-qsignalmapper-or-otherwise/14157471#14157471

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Here's the code which requires 4-5 steps, which I am not getting, to be added for making it work:

mainwindow.h

Code:

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#ifndef MAINWINDOW_H
#define MAINWINDOW_H
 
#include <QMainWindow>
#include <QDebug>
#include <QSignalMapper>
 
namespace Ui {
class MainWindow;
}
 
class MainWindow : public QMainWindow
{
    Q_OBJECT
 
public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
 
 
private:
    Ui::MainWindow *ui;
    void createActions();
 
private slots:
    void interval();
    void help();
    int setAreaThreshold();
 
};
 
#endif // MAINWINDOW_H

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mainwindow.cpp

Code:

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#include "mainwindow.h"
#include "ui_mainwindow.h"
//#include "intervaldialog.h"
//#include "help.h"
 
int i =25;
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    createActions();
}
 
MainWindow::~MainWindow()
{
    delete ui;
}
 
void MainWindow::createActions()
{
    ui->actionInterval->setStatusTip(tr("Set the interval for capturing delta & reference images"));
    connect(ui->actionInterval, SIGNAL(triggered()), this, SLOT(interval()));
 
   QSignalMapper *pSignalMapper = new QSignalMapper(this);
   connect(ui->menuArea_Threshold, SIGNAL(triggered(QAction*)), this, SLOT(setAreaThreshold()));
 
 
    ui->menuHelp->setStatusTip(tr("help "));
}
 
void MainWindow::interval()
{
    qDebug()<<"inside interval qdialog";
}
 
int MainWindow::setAreaThreshold()
{
    qDebug()<<"setting area threshold";
 
//    qDebug()<<str;
//    int i = str.toInt();
//    qDebug()<<i;
//    QString areaThresholdString;
//    areaThresholdString = ui->action25_sec->text();
//    switch (areaThresholdString) {
//    case 25:
//        qDebug()<<"25";
//        break;
//    default:
//        qDebug()<<"default";
//        break;
//    }
 
    return 0;
}
 
void MainWindow::help()
{
    Help help;
    help.exec();
}

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main.cpp

Code:

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#include "mainwindow.h"
#include <QApplication>
 
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();
 
    return a.exec();
}

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Something like:

Code:

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QSignalMapper *pSignalMapper = new QSignalMapper(this);
connect(pSignalMapper, SIGNAL(mapped(int)), SLOT(setAreaThreshold(int)));
connect(ui->action25,  SIGNAL(triggered()), pSignalMapper, SLOT(map()));
connect(ui->action50,  SIGNAL(triggered()), pSignalMapper, SLOT(map()));
connect(ui->action100, SIGNAL(triggered()), pSignalMapper, SLOT(map()));
connect(ui->action150, SIGNAL(triggered()), pSignalMapper, SLOT(map()));
connect(ui->action200, SIGNAL(triggered()), pSignalMapper, SLOT(map()));
pSignalMapper->setMapping(ui->action25,   25);
pSignalMapper->setMapping(ui->action50,   50);
pSignalMapper->setMapping(ui->action100, 100);
pSignalMapper->setMapping(ui->action150, 150);
pSignalMapper->setMapping(ui->action200, 200);
 
// and a slot
void setAreaThreshold(int value) {
 
}

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Or setting the value as the action's custom data and retrieving it in the slot

Code:

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ui->action25->setData(25);
.....
connect(ui->menuArea_Threshold, SIGNAL(triggered(QAction*)), this, SLOT(setAreaThreshold(QAction*)));

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Code:

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setAreaThreshold(QAction *action)
{
    int value = action->data().toInt();
}

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Cheers,
_

Thanks anda_skoa, must remember that variation.