Qt - QTimeEdit as a timer viewer

I have a QTimeEdit which I want to set to some value and the each second I want to decrease by 1 the value that shows the QTimeEdit. So开发者_开发问答 when it will be 0, the I want to have a QMeesageBox that says "Your time is off.". Can I some how do this with QTimeEdit interface, or I should use QTimer?

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You can use QTimeEdit for displaying the time but you will have to use QTimer to decrease the time every second.

You can do something like this:

timeEdit->setTime(...); //set initial time
QTimer timer;
timer.start(1000); //timer will emit timeout() every second
connect(&timer, SIGNAL(timeout()), this, SLOT(slotTimeout()));

void slotTimeout()
{
    QTime time = timeEdit->time().addSecs(-1);
    timeEdit->setTime(time);

    if (time == QTime(0, 0))
        //time is zero, show message box
}