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/*!

    \example widgets/digitalclock

    \title Digital Clock Example

    The Digital Clock example shows how to use QLCDNumber to display a 

    number with LCD-like digits.

    \image digitalclock-example.png Screenshot of the Digital Clock example

    This example also demonstrates how QTimer can be used to update a widget

    at regular intervals.

    \section1 DigitalClock Class Definition

    The \c 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 \c showTime() to update the clock

    display:

    \snippet examples/widgets/digitalclock/digitalclock.h 0

    \section1 DigitalClock Class Implementation

    \snippet examples/widgets/digitalclock/digitalclock.cpp 0

    In the constructor, we first change the look of the LCD numbers. The

    QLCDNumber::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 \l{QTimer::timeout()}{timeout()} signal to the private \c showTime() slot

    so that the display is updated every second. Then, we

    call the \c showTime() slot; without this call, there would be a one-second

    delay at startup before the time is shown.

    \snippet examples/widgets/digitalclock/digitalclock.cpp 1

    \snippet examples/widgets/digitalclock/digitalclock.cpp 2

    The \c 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 QTime::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.

    Finally, we call QLCDNumber::display() to update the widget.

*/