Error: undefined reference to 'vtable for TimeGraphics'

[houmingc]

Error: undefined reference to 'vtable for TimeGraphics'
This class can handle signals and slots and it has a slot called timeWidget_ticker
which is connected to a timer, which means once in a while this function would be called. This function will tick QLabel

'''
class TimeGraphics: public QObject, public QGraphicsRectItem{
Q_OBJECT
public:
TimeGraphics();
public slots:
void timeWidget_ticker();
private:
QLabel* timeWidget;
};

'''
TimeGraphics::TimeGraphics()
{

QLabel *timeWidget = new QLabel;
timeWidget->setStyleSheet("QLabel {color:white;}");
QTimer *systemTimer1 = new QTimer(this);
connect(systemTimer1,SIGNAL(timeout()), this, SLOT(timeWidget_ticker));
systemTimer1->start();

}

void TimeGraphics::timeWidget_ticker()
{
QTime time = QTime::currentTime();
QString time_text = time.toString("hh : mm : ss");
if (time.second() % 2 == 0)
{
time_text[3]= ' ';
time_text[8]= ' ';
}
timeWidget->setText(time_text);
}

[houmingc]

It is solved after running qmake and clean.
But i can't create object onto Graphics with the code below

'''
TimeGraphics *timerWidget = new TimeGraphics();
scene.addItem(timerWidget);

[SGaist]

Hi,

What do you mean by "can't create" ? What your expecting ? What are you getting ?