Qtimer Signal Slot Example

The QTimer class provides repetitive and single-shot timers. More..

1. Qtimer Update Ui
2. Qtimer Start
3. Qtimer Timeout
4. Qt Qtimer Example
5. Qtimer Python
6. Qtimer Pyqt

QTimer example for PyQt5 If an operation is performed periodically in the application, such as periodically detecting the CPU value of the host, then the QTimer timer is needed. When the window's control receives a Timeout signal, it stops this timer. Python QTimer - 30 examples found. These are the top rated real world Python examples of qt.QTimer extracted from open source projects. You can rate examples to help us improve the quality of examples.

Properties

Public Functions

Public Slots

Signals

Static Public Members

Reimplemented Protected Functions

Detailed Description

The QTimer class provides a high-level programming interface for timers. To use it, create a QTimer, connect its timeout() signal to the appropriate slots, and call start(). From then on, it will emit the timeout() signal at constant intervals.

Example for a one second (1000 millisecond) timer (from the Analog Clock example):

From then on, the update() slot is called every second.

You can set a timer to time out only once by calling setSingleShot(true). You can also use the static QTimer::singleShot() function to call a slot after a specified interval:

In multithreaded applications, you can use QTimer in any thread that has an event loop. To start an event loop from a non-GUI thread, use QThread::exec(). Qt uses the timer's thread affinity to determine which thread will emit the timeout() signal. Because of this, you must start and stop the timer in its thread; it is not possible to start a timer from another thread.

As a special case, a QTimer with a timeout of 0 will time out as soon as possible, though the ordering between zero timers and other sources of events is unspecified. Zero timers can be used to do some work while still providing a snappy user interface:

From then on, processOneThing() will be called repeatedly. It should be written in such a way that it always returns quickly (typically after processing one data item) so that Qt can deliver events to the user interface and stop the timer as soon as it has done all its work. This is the traditional way of implementing heavy work in GUI applications, but as multithreading is nowadays becoming available on more and more platforms, we expect that zero-millisecond QTimer objects will gradually be replaced by QThreads.

Accuracy and Timer Resolution

The accuracy of timers depends on the underlying operating system and hardware. Most platforms support a resolution of 1 millisecond, though the accuracy of the timer will not equal this resolution in many real-world situations.

The accuracy also depends on the timer type. For Qt::PreciseTimer, QTimer will try to keep the accuracy at 1 millisecond. Precise timers will also never time out earlier than expected.

For Qt::CoarseTimer and Qt::VeryCoarseTimer types, QTimer may wake up earlier than expected, within the margins for those types: 5% of the interval for Qt::CoarseTimer and 500 ms for Qt::VeryCoarseTimer.

All timer types may time out later than expected if the system is busy or unable to provide the requested accuracy. In such a case of timeout overrun, Qt will emit timeout() only once, even if multiple timeouts have expired, and then will resume the original interval.

Alternatives to QTimer

An alternative to using QTimer is to call QObject::startTimer() for your object and reimplement the QObject::timerEvent() event handler in your class (which must inherit QObject). The disadvantage is that timerEvent() does not support such high-level features as single-shot timers or signals.

Another alternative is QBasicTimer. It is typically less cumbersome than using QObject::startTimer() directly. See Timers for an overview of all three approaches.

Some operating systems limit the number of timers that may be used; Qt tries to work around these limitations.

See also QBasicTimer, QTimerEvent, QObject::timerEvent(), Timers, Analog Clock Example, and Wiggly Example.

Property Documentation

Qtimer Update Ui

active : const bool

This boolean property is true if the timer is running; otherwise false.

This property was introduced in Qt 4.3.

Access functions:

interval : int

This property holds the timeout interval in milliseconds

The default value for this property is 0. A QTimer with a timeout interval of 0 will time out as soon as all the events in the window system's event queue have been processed.

Setting the interval of an active timer changes its timerId().

Access functions:

See also singleShot.

remainingTime : const int

This property holds the remaining time in milliseconds

Returns the timer's remaining value in milliseconds left until the timeout. If the timer is inactive, the returned value will be -1. If the timer is overdue, the returned value will be 0.

This property was introduced in Qt 5.0.

Access functions:

See also interval.

singleShot : bool

This property holds whether the timer is a single-shot timer

A single-shot timer fires only once, non-single-shot timers fire every interval milliseconds.

The default value for this property is false.

Access functions:

See also interval and singleShot().

timerType : Qt::TimerType

controls the accuracy of the timer

The default value for this property is Qt::CoarseTimer.

Access functions:

See also Qt::TimerType.

Member Function Documentation

QTimer::QTimer(QObject *parent = nullptr)

Constructs a timer with the given parent.

[slot] void QTimer::start()

This function overloads start().

Starts or restarts the timer with the timeout specified in interval.

If the timer is already running, it will be stopped and restarted.

If singleShot is true, the timer will be activated only once.

[slot] void QTimer::start(intmsec)

Starts or restarts the timer with a timeout interval of msec milliseconds.

If the timer is already running, it will be stopped and restarted.

If singleShot is true, the timer will be activated only once.

[slot] void QTimer::stop()

Stops the timer.

See also start().

[signal] void QTimer::timeout()

This signal is emitted when the timer times out.

Note: This is a private signal. It can be used in signal connections but cannot be emitted by the user.

See also interval, start(), and stop().

[virtual] QTimer::~QTimer()

Destroys the timer.

template QMetaObject::Connection QTimer::callOnTimeout(Functorslot, Qt::ConnectionTypeconnectionType = Qt::AutoConnection)

This is an overloaded function.

Creates a connection of type connectionType from the timeout() signal to slot, and returns a handle to the connection.

This method is provided for convenience. It's equivalent to calling QObject::connect(timer, &QTimer::timeout, timer, slot, connectionType).

This function was introduced in Qt 5.12.

See also QObject::connect() and timeout().

template QMetaObject::Connection QTimer::callOnTimeout(const QObject *context, Functorslot, Qt::ConnectionTypeconnectionType = Qt::AutoConnection)

This function overloads callOnTimeout().

Creates a connection from the timeout() signal to slot to be placed in a specific event loop of context, and returns a handle to the connection.

This method is provided for convenience. It's equivalent to calling QObject::connect(timer, &QTimer::timeout, context, slot, connectionType).

This function was introduced in Qt 5.12.

See also QObject::connect() and timeout().

template QMetaObject::Connection QTimer::callOnTimeout(const QObject *receiver, MemberFunction *slot, Qt::ConnectionTypeconnectionType = Qt::AutoConnection)

This function overloads callOnTimeout().

Creates a connection from the timeout() signal to the slot in the receiver object. Returns a handle to the connection.

This method is provided for convenience. It's equivalent to calling QObject::connect(timer, &QTimer::timeout, receiver, slot, connectionType).

This function was introduced in Qt 5.12.

See also QObject::connect() and timeout().

std::chrono::milliseconds QTimer::intervalAsDuration() const

Returns the interval of this timer as a std::chrono::milliseconds object.

This function was introduced in Qt 5.8.

See also interval.

bool QTimer::isActive() const

Returns true if the timer is running (pending); otherwise returns false.

Note: Getter function for property active.

std::chrono::milliseconds QTimer::remainingTimeAsDuration() const

Returns the time remaining in this timer object as a std::chrono::milliseconds object. If this timer is due or overdue, the returned value is std::chrono::milliseconds::zero(). If the remaining time could not be found or the timer is not active, this function returns a negative duration.

This function was introduced in Qt 5.8.

See also remainingTime().

[static] void QTimer::singleShot(intmsec, const QObject *receiver, const char *member)

This static function calls a slot after a given time interval.

It is very convenient to use this function because you do not need to bother with a timerEvent or create a local QTimer object.

Example:

This sample program automatically terminates after 10 minutes (600,000 milliseconds).

The receiver is the receiving object and the member is the slot. The time interval is msec milliseconds.

Note: This function is reentrant.

See also setSingleShot() and start().

[static] void QTimer::singleShot(intmsec, Qt::TimerTypetimerType, const QObject *receiver, const char *member)

This is an overloaded function.

This static function calls a slot after a given time interval.

It is very convenient to use this function because you do not need to bother with a timerEvent or create a local QTimer object.

The receiver is the receiving object and the member is the slot. The time interval is msec milliseconds. The timerType affects the accuracy of the timer.

Note: This function is reentrant.

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See also start().

[static] template void QTimer::singleShot(intmsec, const QObject *receiver, PointerToMemberFunctionmethod)

This is an overloaded function.

This static function calls a member function of a QObject after a given time interval.

It is very convenient to use this function because you do not need to bother with a timerEvent or create a local QTimer object.

The receiver is the receiving object and the method is the member function. The time interval is msec milliseconds.

If receiver is destroyed before the interval occurs, the method will not be called. The function will be run in the thread of receiver. The receiver's thread must have a running Qt event loop.

Note: This function is reentrant.

This function was introduced in Qt 5.4.

See also start().

[static] template void QTimer::singleShot(intmsec, Qt::TimerTypetimerType, const QObject *receiver, PointerToMemberFunctionmethod)

This is an overloaded function.

This static function calls a member function of a QObject after a given time interval.

It is very convenient to use this function because you do not need to bother with a timerEvent or create a local QTimer object.

The receiver is the receiving object and the method is the member function. The time interval is msec milliseconds. The timerType affects the accuracy of the timer.

If receiver is destroyed before the interval occurs, the method will not be called. The function will be run in the thread of receiver. The receiver's thread must have a running Qt event loop.

Note: This function is reentrant.

This function was introduced in Qt 5.4.

See also start().

[static] template void QTimer::singleShot(intmsec, Functorfunctor)

This is an overloaded function.

This static function calls functor after a given time interval.

It is very convenient to use this function because you do not need to bother with a timerEvent or create a local QTimer object.

The time interval is msec milliseconds.

Note: This function is reentrant.

This function was introduced in Qt 5.4.

See also start().

[static] template void QTimer::singleShot(intmsec, Qt::TimerTypetimerType, Functorfunctor)

This is an overloaded function.

This static function calls functor after a given time interval.

It is very convenient to use this function because you do not need to bother with a timerEvent or create a local QTimer object.

The time interval is msec milliseconds. The timerType affects the accuracy of the timer.

Note: This function is reentrant.

This function was introduced in Qt 5.4.

See also start().

[static] template void QTimer::singleShot(intmsec, const QObject *context, Functorfunctor)

This is an overloaded function.

This static function calls functor after a given time interval.

It is very convenient to use this function because you do not need to bother with a timerEvent or create a local QTimer object.

The time interval is msec milliseconds.

If context is destroyed before the interval occurs, the method will not be called. The function will be run in the thread of context. The context's thread must have a running Qt event loop.

Note: This function is reentrant.

This function was introduced in Qt 5.4.

See also start().

[static] template void QTimer::singleShot(intmsec, Qt::TimerTypetimerType, const QObject *context, Functorfunctor)

This is an overloaded function.

Qtimer Start

This static function calls functor after a given time interval.

It is very convenient to use this function because you do not need to bother with a timerEvent or create a local QTimer object.

The time interval is msec milliseconds. The timerType affects the accuracy of the timer.

If context is destroyed before the interval occurs, the method will not be called. The function will be run in the thread of context. The context's thread must have a running Qt event loop.

Note: This function is reentrant.

This function was introduced in Qt 5.4.

See also start().

[static] void QTimer::singleShot(std::chrono::millisecondsmsec, const QObject *receiver, const char *member)

This is an overloaded function.

This static function calls a slot after a given time interval.

It is very convenient to use this function because you do not need to bother with a timerEvent or create a local QTimer object.

The receiver is the receiving object and the member is the slot. The time interval is given in the duration object msec.

Note: This function is reentrant.

This function was introduced in Qt 5.8.

See also start().

[static] void QTimer::singleShot(std::chrono::millisecondsmsec, Qt::TimerTypetimerType, const QObject *receiver, const char *member)

This is an overloaded function.

This static function calls a slot after a given time interval.

It is very convenient to use this function because you do not need to bother with a timerEvent or create a local QTimer object.

The receiver is the receiving object and the member is the slot. The time interval is given in the duration object msec. The timerType affects the accuracy of the timer.

Note: This function is reentrant.

This function was introduced in Qt 5.8.

See also start().

void QTimer::start(std::chrono::millisecondsmsec)

This is an overloaded function.

Starts or restarts the timer with a timeout of duration msec milliseconds.

If the timer is already running, it will be stopped and restarted.

If singleShot is true, the timer will be activated only once.

This function was introduced in Qt 5.8.

[override virtual protected] void QTimer::timerEvent(QTimerEvent *e)

Reimplements: QObject::timerEvent(QTimerEvent *event).

int QTimer::timerId() const

Returns the ID of the timer if the timer is running; otherwise returns -1.

© 2020 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.

The QTimer class provides repetitive and single-shot timers.More..

controls the accuracy of the timer

The default value for this property is Qt::CoarseTimer.

Access functions:

See also Qt::TimerType.

Member Function Documentation

QTimer::QTimer(QObject *parent = nullptr)

Constructs a timer with the given parent.

[slot] void QTimer::start()

This function overloads start().

Starts or restarts the timer with the timeout specified in interval.

If the timer is already running, it will be stopped and restarted.

If singleShot is true, the timer will be activated only once.

[slot] void QTimer::start(intmsec)

Starts or restarts the timer with a timeout interval of msec milliseconds.

If the timer is already running, it will be stopped and restarted.

If singleShot is true, the timer will be activated only once.

[slot] void QTimer::stop()

Stops the timer.

See also start().

[signal] void QTimer::timeout()

This signal is emitted when the timer times out.

Note: This is a private signal. It can be used in signal connections but cannot be emitted by the user.

See also interval, start(), and stop().

[virtual] QTimer::~QTimer()

Destroys the timer.

template QMetaObject::Connection QTimer::callOnTimeout(Functorslot, Qt::ConnectionTypeconnectionType = Qt::AutoConnection)

This is an overloaded function.

Creates a connection of type connectionType from the timeout() signal to slot, and returns a handle to the connection.

This method is provided for convenience. It's equivalent to calling QObject::connect(timer, &QTimer::timeout, timer, slot, connectionType).

This function was introduced in Qt 5.12.

See also QObject::connect() and timeout().

template QMetaObject::Connection QTimer::callOnTimeout(const QObject *context, Functorslot, Qt::ConnectionTypeconnectionType = Qt::AutoConnection)

This function overloads callOnTimeout().

Creates a connection from the timeout() signal to slot to be placed in a specific event loop of context, and returns a handle to the connection.

This method is provided for convenience. It's equivalent to calling QObject::connect(timer, &QTimer::timeout, context, slot, connectionType).

This function was introduced in Qt 5.12.

See also QObject::connect() and timeout().

template QMetaObject::Connection QTimer::callOnTimeout(const QObject *receiver, MemberFunction *slot, Qt::ConnectionTypeconnectionType = Qt::AutoConnection)

This function overloads callOnTimeout().

Creates a connection from the timeout() signal to the slot in the receiver object. Returns a handle to the connection.

This method is provided for convenience. It's equivalent to calling QObject::connect(timer, &QTimer::timeout, receiver, slot, connectionType).

This function was introduced in Qt 5.12.

See also QObject::connect() and timeout().

std::chrono::milliseconds QTimer::intervalAsDuration() const

Returns the interval of this timer as a std::chrono::milliseconds object.

This function was introduced in Qt 5.8.

See also interval.

bool QTimer::isActive() const

Returns true if the timer is running (pending); otherwise returns false.

Note: Getter function for property active.

std::chrono::milliseconds QTimer::remainingTimeAsDuration() const

Returns the time remaining in this timer object as a std::chrono::milliseconds object. If this timer is due or overdue, the returned value is std::chrono::milliseconds::zero(). If the remaining time could not be found or the timer is not active, this function returns a negative duration.

This function was introduced in Qt 5.8.

See also remainingTime().

[static] void QTimer::singleShot(intmsec, const QObject *receiver, const char *member)

This static function calls a slot after a given time interval.

It is very convenient to use this function because you do not need to bother with a timerEvent or create a local QTimer object.

Example:

This sample program automatically terminates after 10 minutes (600,000 milliseconds).

The receiver is the receiving object and the member is the slot. The time interval is msec milliseconds.

Note: This function is reentrant.

See also setSingleShot() and start().

[static] void QTimer::singleShot(intmsec, Qt::TimerTypetimerType, const QObject *receiver, const char *member)

This is an overloaded function.

This static function calls a slot after a given time interval.

It is very convenient to use this function because you do not need to bother with a timerEvent or create a local QTimer object.

The receiver is the receiving object and the member is the slot. The time interval is msec milliseconds. The timerType affects the accuracy of the timer.

Note: This function is reentrant.

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See also start().

[static] template void QTimer::singleShot(intmsec, const QObject *receiver, PointerToMemberFunctionmethod)

This is an overloaded function.

This static function calls a member function of a QObject after a given time interval.

It is very convenient to use this function because you do not need to bother with a timerEvent or create a local QTimer object.

The receiver is the receiving object and the method is the member function. The time interval is msec milliseconds.

If receiver is destroyed before the interval occurs, the method will not be called. The function will be run in the thread of receiver. The receiver's thread must have a running Qt event loop.

Note: This function is reentrant.

This function was introduced in Qt 5.4.

See also start().

[static] template void QTimer::singleShot(intmsec, Qt::TimerTypetimerType, const QObject *receiver, PointerToMemberFunctionmethod)

This is an overloaded function.

This static function calls a member function of a QObject after a given time interval.

It is very convenient to use this function because you do not need to bother with a timerEvent or create a local QTimer object.

The receiver is the receiving object and the method is the member function. The time interval is msec milliseconds. The timerType affects the accuracy of the timer.

If receiver is destroyed before the interval occurs, the method will not be called. The function will be run in the thread of receiver. The receiver's thread must have a running Qt event loop.

Note: This function is reentrant.

This function was introduced in Qt 5.4.

See also start().

[static] template void QTimer::singleShot(intmsec, Functorfunctor)

This is an overloaded function.

This static function calls functor after a given time interval.

It is very convenient to use this function because you do not need to bother with a timerEvent or create a local QTimer object.

The time interval is msec milliseconds.

Note: This function is reentrant.

This function was introduced in Qt 5.4.

See also start().

[static] template void QTimer::singleShot(intmsec, Qt::TimerTypetimerType, Functorfunctor)

This is an overloaded function.

This static function calls functor after a given time interval.

It is very convenient to use this function because you do not need to bother with a timerEvent or create a local QTimer object.

The time interval is msec milliseconds. The timerType affects the accuracy of the timer.

Note: This function is reentrant.

This function was introduced in Qt 5.4.

See also start().

[static] template void QTimer::singleShot(intmsec, const QObject *context, Functorfunctor)

This is an overloaded function.

This static function calls functor after a given time interval.

It is very convenient to use this function because you do not need to bother with a timerEvent or create a local QTimer object.

The time interval is msec milliseconds.

If context is destroyed before the interval occurs, the method will not be called. The function will be run in the thread of context. The context's thread must have a running Qt event loop.

Note: This function is reentrant.

This function was introduced in Qt 5.4.

See also start().

[static] template void QTimer::singleShot(intmsec, Qt::TimerTypetimerType, const QObject *context, Functorfunctor)

This is an overloaded function.

Qtimer Start

This static function calls functor after a given time interval.

It is very convenient to use this function because you do not need to bother with a timerEvent or create a local QTimer object.

The time interval is msec milliseconds. The timerType affects the accuracy of the timer.

If context is destroyed before the interval occurs, the method will not be called. The function will be run in the thread of context. The context's thread must have a running Qt event loop.

Note: This function is reentrant.

This function was introduced in Qt 5.4.

See also start().

[static] void QTimer::singleShot(std::chrono::millisecondsmsec, const QObject *receiver, const char *member)

This is an overloaded function.

This static function calls a slot after a given time interval.

It is very convenient to use this function because you do not need to bother with a timerEvent or create a local QTimer object.

The receiver is the receiving object and the member is the slot. The time interval is given in the duration object msec.

Note: This function is reentrant.

This function was introduced in Qt 5.8.

See also start().

[static] void QTimer::singleShot(std::chrono::millisecondsmsec, Qt::TimerTypetimerType, const QObject *receiver, const char *member)

This is an overloaded function.

This static function calls a slot after a given time interval.

It is very convenient to use this function because you do not need to bother with a timerEvent or create a local QTimer object.

The receiver is the receiving object and the member is the slot. The time interval is given in the duration object msec. The timerType affects the accuracy of the timer.

Note: This function is reentrant.

This function was introduced in Qt 5.8.

See also start().

void QTimer::start(std::chrono::millisecondsmsec)

This is an overloaded function.

Starts or restarts the timer with a timeout of duration msec milliseconds.

If the timer is already running, it will be stopped and restarted.

If singleShot is true, the timer will be activated only once.

This function was introduced in Qt 5.8.

[override virtual protected] void QTimer::timerEvent(QTimerEvent *e)

Reimplements: QObject::timerEvent(QTimerEvent *event).

int QTimer::timerId() const

Returns the ID of the timer if the timer is running; otherwise returns -1.

© 2020 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.

The QTimer class provides repetitive and single-shot timers.More..

Inherits QObject.

Methods

• int interval (self)
• bool isSingleShot (self)
• setSingleShot (self, bool asingleShot)
• start (self)
• timerEvent (self, QTimerEvent)

Static Methods

• singleShot (int msec, QObject receiver, SLOT()SLOT() member)

Qt Signals

• void timeout ()

Detailed Description

The QTimer class provides repetitive and single-shot timers.

The QTimer class provides a high-level programming interface fortimers. To use it, create a QTimer, connect its timeout() signal to the appropriateslots, and call start(). From thenon it will emit the timeout()signal at constant intervals.

Example for a one second (1000 millisecond) timer (from theAnalog Clock example):

From then on, the update() slot is called everysecond.

You can set a timer to time out only once by callingsetSingleShot(true). You can also use the static QTimer.singleShot() function to calla slot after a specified interval:

In multithreaded applications, you can use QTimer in any threadthat has an event loop. To start an event loop from a non-GUIthread, use QThread.exec(). Qtuses the timer's thread affinityto determine which thread will emit the timeout() signal. Because of this, youmust start and stop the timer in its thread; it is not possible tostart a timer from another thread.

As a special case, a QTimer with a timeout of 0 will time out assoon as all the events in the window system's event queue have beenprocessed. This can be used to do heavy work while providing asnappy user interface:

processOneThing() will from then on be calledrepeatedly. It should be written in such a way that it alwaysreturns quickly (typically after processing one data item) so thatQt can deliver events to widgets and stop the timer as soon as ithas done all its work. This is the traditional way of implementingheavy work in GUI applications; multithreading is now becomingavailable on more and more platforms, and we expect thatzero-millisecond QTimers will gradually be replaced by QThreads.

Accuracy and Timer Resolution

Timers will never time out earlier than the specified timeoutvalue and they are not guaranteed to time out at the exact valuespecified. In many situations, they may time out late by a periodof time that depends on the accuracy of the system timers.

The accuracy of timers depends on the underlying operatingsystem and hardware. Most platforms support a resolution of 1millisecond, though the accuracy of the timer will not equal thisresolution in many real-world situations.

If Qt is unable to deliver the requested number of timer clicks,it will silently discard some. Les sables d'olonne france.

Alternatives to QTimer

An alternative to using QTimer is to call QObject.startTimer() for your objectand reimplement the QObject.timerEvent() event handlerin your class (which must inherit QObject). The disadvantage is that timerEvent() does not support suchhigh-level features as single-shot timers or signals.

Another alternative to using QTimer is to use QBasicTimer. It is typically less cumbersomethan using QObject.startTimer() directly. SeeTimers for an overview of all threeapproaches.

Some operating systems limit the number of timers that may beused; Qt tries to work around these limitations.

Method Documentation

QTimer.__init__ (self, QObjectparent = None)

The parent argument, if not None, causes self to be owned by Qt instead of PyQt.

Constructs a timer with the given parent.

int QTimer.interval (self)

bool QTimer.isActive (self)

bool QTimer.isSingleShot (self)

QTimer.setInterval (self, int msec)

QTimer.setSingleShot (self, bool asingleShot)

QTimer.singleShot (int msec, QObjectreceiver, SLOT()SLOT() member)

This static function calls a slot after a given timeinterval.

It is very convenient to use this function because you do notneed to bother with a timerEvent or create a local QTimer object.

Example:

This sample program automatically terminates after 10 minutes(600,000 milliseconds).

The receiver is the receiving object and themember is the slot. The time interval is msecmilliseconds.

Note: This function is reentrant.

See alsosetSingleShot() and start().

QTimer.singleShot (int msec, callable receiver)

QTimer.start (self, int msec)

If the timer is already running, it will be stopped and restarted.

If singleShot is true,the timer will be activated only once.

QTimer.start (self)

This function overloads start().

Starts or restarts the timer with the timeout specified ininterval.

If the timer is already running, it will be stopped and restarted.

If singleShot is true,the timer will be activated only once.

QTimer.stop (self)

See alsostart().

QTimer.timerEvent (self, QTimerEvent)

Reimplemented from QObject.timerEvent().

Qtimer Timeout

int QTimer.timerId (self)

Qt Signal Documentation

Qt Qtimer Example

void timeout ()

Qtimer Python

See alsointerval, start(), and stop().

Qtimer Pyqt