How to display cutoff label with continuing dots?

I have a label that can't be bigger than fixed size. Therefore some strings are cutoff and some aren't. Is there a way to test if the text exceeds the size of the label? And then to draw "..." at the end of the string?

Code:

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QHBoxLayout *l = new QHBoxLayout;
QString numberStr = "1.234556776544";
QLabel *label = new QLabel(numberStr);
label->setToolTip(numberStr);
label->setTextInteractionFlags(Qt::TextSelectableByMouse);
label->setFixedWidth(66);
l->addWidget(label);

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Thanks!

Try to use the QFontMetrics class.