How to use QTimer for pausing and resuming ?

Hello,

I need some help on the usage of Qtimer.

I work with Qt 5.0.2 and here my problem :

I am trying to develop a Timer, and the interface is simple :

There is just 2 button : the button "Start", to launch the timer, and the "Pause" Button, and a QtimeEdit to display the time.

This screenshot shows how it looks like : http://img834.imageshack.us/img834/1046/5ks6.png

The problem is that the pause function doesn't work. I have read all the documentation about Qtimer here : http://harmattan-dev.nokia.com/docs/...t4/qtimer.html and here : http://qt.developpez.com/doc/5.0-snapshot/qtimer/ , but no result.

This is the source code I have : (I put only what is needed)

Code:

// Creation of the Buttons and the time area
    void MainWindow::createBottom()
    {
 
        bottom = new QWidget();
 
        play = new QPushButton("Launch",this);
        pause = new QPushButton("Pause",this);
        play->setDisabled(false);
        pause->setDisabled(true);
        timeEdit = new QTimeEdit(this);
        timeEdit->setDisplayFormat("mm:ss");
 
        layout->addWidget(play);
        layout->addWidget(pause);
        layout->addWidget(timeEdit );
        bottom->setLayout(layout);
 
        connect(play, SIGNAL(clicked()), this, SLOT(startSimulation()));
        connect(pause, SIGNAL(clicked()), this, SLOT(pauseSimulation()));
    }
 
    // to resume the timer where is was stopped
    void MainWindow::resumeSimulation()
    {
        timer->blockSignals( false );
        pause->setText("Pause");
        pause->disconnect(SIGNAL(clicked()));
        connect(pause, SIGNAL(clicked()), this, SLOT(pauseSimulation())); 
        paused = false;
 
        timer->start();
        int timeOfPause = time->restart();
        int timeTotal = timeOfPause + timeElapsed;
        time->addMSecs(-timeTotal);
 
    }
 
    // to Start the timer
    void MainWindow::pauseSimulation()
    {
        timer->blockSignals(true);
        pause->setText("Resume");
        timer->stop();
        play->setDisabled(false);
        //pause->setDisabled(true);
        pause->disconnect(SIGNAL(clicked()));
 
        connect(pause, SIGNAL(clicked()), this, SLOT(resumeSimulation())); 
        paused = true;
    }
 
    // to Start the timer from zero.
    void MainWindow::startSimulation()
    {
 
        timer = new QTimer(this);
        connect(timer, SIGNAL(timeout()), this , SLOT(updateTime()));
        timer->start(500);
        play->setDisabled(true);
 
        pause->setDisabled(false);
    }
void MainWindow::updateTime()
{
    if(time == NULL)
    {
       time = new QTime(0,0,0,0);
       time->start();
    }
    //timeEdit->setTime(QTime::fromS(time->elapsed()));
    //time = &(time->addMSecs(1000));
    if(hasRestart)
    {
        time->restart();
        time->addMSecs(-timeElapsed);
        hasRestart = false;
    }
    else
    {
        timeElapsed =+ time->elapsed();
    }
    int seconds = 0;
    int minutes = 0;
    int hours = 0;
 
    if(!paused)
    {
            seconds = (timeElapsed/1000)%60;
            minutes = (timeElapsed/60000)%60;
            hours =  (timeElapsed/3600000)%24;
            std::cout << "Test : " << hours << ":" << minutes << ":" << seconds << std::endl;
            timeEdit->setTime(QTime(0,minutes,seconds,0));
            timeEdit->update();
    }
}

time, timer, and hasRestart are defined in a header file :

QTime* time;
QTimer *timer;
boolean hasRestart;

When I push the Start button, the timer starts well, but when I push "Pause" it only pause it on the graphic interface, but when I resume, it shows the present time as if it hadn't paused.

For instance :

I start.
I pause at 00:05. It blocks apparently the timer.
I wait for 10 seconds. I resume the timer, it shows 00:15 instead of 00:06

How could I fix that ?

Thank you !

EDIT : I have added some code that was missing in the updateTime() method.