Tutorial by Examples

The following example shows how to use a QTimer to call a slot every 1 second. In the example, we use a QProgressBar to update its value and check the timer is working properly. main.cpp #include <QApplication> #include "timer.h" int main(int argc, char *argv[]) { QApp...

If a singleshot timer is required, it is quiet handy to have the slot as lambda function right in the place where the timer is declared: QTimer::singleShot(1000, []() { /*Code here*/ } ); Due to this Bug (QTBUG-26406), this is way is only possible since Qt5.4. In earlier Qt5 versions it has to ...

void DispatchToMainThread(std::function<void()> callback) { // any thread QTimer* timer = new QTimer(); timer->moveToThread(qApp->thread()); timer->setSingleShot(true); QObject::connect(timer, &QTimer::timeout, [=]() { // main thread ...

QTimer add the functionality to have a specific function/slot called after a certain interval (repeatedly or just once). The QTimer thus allows a GUI application to "check" things regularly or handle timeouts without having to manually start an extra thread for this and be careful about r...

The QTimer::singleShot is used to call a slot/lambda asynchronously after n ms. The basic syntax is : QTimer::singleShot(myTime, myObject, SLOT(myMethodInMyObject())); with myTime the time in ms, myObject the object which contain the method and myMethodInMyObject the slot to call So for exampl...