QBasicTimer Class
The QBasicTimer class provides timer events for objects. More...
| Header: | #include <QBasicTimer> |
| qmake: | QT += core |
Public Functions
| QBasicTimer() | |
| ~QBasicTimer() | |
| bool | isActive() const |
| void | start(int msec, QObject *object) |
| void | start(int msec, Qt::TimerType timerType, QObject *obj) |
| void | stop() |
| int | timerId() const |
Detailed Description
The QBasicTimer class provides timer events for objects.
This is a fast, lightweight, and low-level class used by Qt internally. We recommend using the higher-level QTimer class rather than this class if you want to use timers in your applications. Note that this timer is a repeating timer that will send subsequent timer events unless the stop() function is called.
To use this class, create a QBasicTimer, and call its start() function with a timeout interval and with a pointer to a QObject subclass. When the timer times out it will send a timer event to the QObject subclass. The timer can be stopped at any time using stop(). isActive() returns true for a timer that is running; i.e. it has been started, has not reached the timeout time, and has not been stopped. The timer's ID can be retrieved using timerId().
The Wiggly example uses QBasicTimer to repaint a widget at regular intervals.
See also QTimer, QTimerEvent, QObject::timerEvent(), Timers, and Wiggly Example.
Member Function Documentation
QBasicTimer::QBasicTimer()
Contructs a basic timer.
See also start().
QBasicTimer::~QBasicTimer()
Destroys the basic timer.
bool QBasicTimer::isActive() const
Returns true if the timer is running and has not been stopped; otherwise returns false.
void QBasicTimer::start(int msec, QObject *object)
Starts (or restarts) the timer with a msec milliseconds timeout. The timer will be a Qt::CoarseTimer. See Qt::TimerType for information on the different timer types.
The given object will receive timer events.
See also stop(), isActive(), QObject::timerEvent(), and Qt::CoarseTimer.
void QBasicTimer::start(int msec, Qt::TimerType timerType, QObject *obj)
This is an overloaded function.
Starts (or restarts) the timer with a msec milliseconds timeout and the given timerType. See Qt::TimerType for information on the different timer types.
obj will receive timer events.
See also stop(), isActive(), QObject::timerEvent(), and Qt::TimerType.
void QBasicTimer::stop()
Stops the timer.
See also start() and isActive().
int QBasicTimer::timerId() const
Returns the timer's ID.
See also QTimerEvent::timerId().
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