class QBasicTimer#

The QBasicTimer class provides timer events for objects. More




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Detailed Description#

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() .

Objects of this class cannot be copied, but can be moved, so you can maintain a list of basic timers by holding them in container that supports move-only types, e.g. std::vector.

See also

QTimer QTimerEvent timerEvent() Timers Affine Transformations


Constructs a basic timer.

See also


Return type:


Returns true if the timer is running and has not been stopped; otherwise returns false.

See also

start() stop()

start(msec, obj)#

Use chrono overload instead.

start(msec, timerType, obj)

This is an overloaded function.

Use chrono overload instead.


Stops the timer.

See also

start() isActive()



Swaps the timer other with this timer. This operation is very fast and never fails.

Return type:


Returns the timer’s ID.

See also