数字时钟范例 ¶

DigitalClock class provides a clock widget showing the time with hours and minutes separated by a blinking colon. We subclass QLCDNumber and implement a private slot called showTime() to update the clock display:

class DigitalClock : public QLCDNumber
{
    Q_OBJECT
public:
    DigitalClock(QWidget *parent = nullptr);
private slots:
    void showTime();
};
											

DigitalClock::DigitalClock(QWidget *parent)
    : QLCDNumber(parent)
{
    setSegmentStyle(Filled);
    QTimer *timer = new QTimer(this);
    connect(timer, &QTimer::timeout, this, &DigitalClock::showTime);
    timer->start(1000);
    showTime();
    setWindowTitle(tr("Digital Clock"));
    resize(150, 60);
}
											

In the constructor, we first change the look of the LCD numbers. The Filled style produces raised segments filled with the foreground color (typically black). We also set up a one-second timer to keep track of the current time, and we connect its timeout() signal to the private showTime() slot so that the display is updated every second. Then, we call the showTime() slot; without this call, there would be a one-second delay at startup before the time is shown.

void DigitalClock::showTime()
{
    QTime time = QTime::currentTime();
    QString text = time.toString("hh:mm");
    if ((time.second() % 2) == 0)
        text[2] = ' ';
    display(text);
}
											

showTime() slot is called whenever the clock display needs to be updated.

The current time is converted into a string with the format “hh:mm”. When second() is a even number, the colon in the string is replaced with a space. This makes the colon appear and vanish every other second.

最后，调用 display() to update the widget.

范例工程 @ code.qt.io