qt exec
int QApplication::exec()
{
#ifndef QT_NO_ACCESSIBILITY
QAccessible::setRootObject(qApp);
#endif
return QCoreApplication::exec();
}
int QCoreApplication::exec()
{
if (!QCoreApplicationPrivate::checkInstance("exec"))
return -1;
QThreadData *threadData = self->d_func()->threadData;
if (threadData != QThreadData::current()) {
qWarning("%s::exec: Must be called from the main thread", self->metaObject()->className());
return -1;
}
if (!threadData->eventLoops.isEmpty()) {
qWarning("QCoreApplication::exec: The event loop is already running");
return -1;
}
threadData->quitNow = false;
QEventLoop eventLoop;
self->d_func()->in_exec = true;
self->d_func()->aboutToQuitEmitted = false;
int returnCode = eventLoop.exec();
threadData->quitNow = false;
if (self) {
self->d_func()->in_exec = false;
if (!self->d_func()->aboutToQuitEmitted)
emit self->aboutToQuit();
self->d_func()->aboutToQuitEmitted = true;
sendPostedEvents(0, QEvent::DeferredDelete);
}
return returnCode;
}
eventLoop.exec();------》
while (!d->exit)
processEvents(flags | WaitForMoreEvents | EventLoopExec);
bool QEventLoop::processEvents(ProcessEventsFlags flags)
{
Q_D(QEventLoop);
if (!d->threadData->eventDispatcher)
return false;
if (flags & DeferredDeletion)
QCoreApplication::sendPostedEvents(0, QEvent::DeferredDelete);
return d->threadData->eventDispatcher->processEvents(flags);
}
进一步:这将调用平台相关的函数,比如:
bool QEventDispatcherQWS::processEvents(QEventLoop::ProcessEventsFlags flags) bool QGuiEventDispatcherWin32::processEvents(QEventLoop::ProcessEventsFlags flags)
int QApplication::qwsProcessEvent(QWSEvent* event)
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