/****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
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** $QT_END_LICENSE$
**
****************************************************************************/
#include "qcoreapplication.h"
#include "qcoreapplication_p.h"
#include "qabstracteventdispatcher.h"
#include "qcoreevent.h"
#include "qeventloop.h"
#include "qcorecmdlineargs_p.h"
#include <qdatastream.h>
#include <qdatetime.h>
#include <qdebug.h>
#include <qdir.h>
#include <qfile.h>
#include <qfileinfo.h>
#include <qhash.h>
#include <private/qprocess_p.h>
#include <qtextcodec.h>
#include <qthread.h>
#include <qthreadpool.h>
#include <qthreadstorage.h>
#include <private/qthread_p.h>
#include <qlibraryinfo.h>
#include <qvarlengtharray.h>
#include <private/qfactoryloader_p.h>
#include <private/qfunctions_p.h>
#ifdef Q_OS_SYMBIAN
# include <exception>
# include <f32file.h>
# include "qeventdispatcher_symbian_p.h"
# include "private/qcore_symbian_p.h"
#elif defined(Q_OS_UNIX)
# if !defined(QT_NO_GLIB)
# include "qeventdispatcher_glib_p.h"
# endif
# include "qeventdispatcher_unix_p.h"
#endif
#ifdef Q_OS_WIN
# include "qeventdispatcher_win_p.h"
#endif
#ifdef Q_OS_MAC
# include "qcore_mac_p.h"
#endif
#include <stdlib.h>
#ifdef Q_OS_UNIX
# include <locale.h>
#endif
#ifdef Q_OS_VXWORKS
# include <taskLib.h>
#endif
QT_BEGIN_NAMESPACE
class QMutexUnlocker
{
public:
inline explicit QMutexUnlocker(QMutex *m)
: mtx(m)
{ }
inline ~QMutexUnlocker() { unlock(); }
inline void unlock() { if (mtx) mtx->unlock(); mtx = 0; }
private:
Q_DISABLE_COPY(QMutexUnlocker)
QMutex *mtx;
};
#ifdef Q_OS_SYMBIAN
typedef TDriveNumber (*SystemDriveFunc)(RFs&);
static SystemDriveFunc PtrGetSystemDrive=0;
#endif
#if defined(Q_WS_WIN) || defined(Q_WS_MAC)
extern QString qAppFileName();
#endif
#if !defined(Q_OS_WIN)
#ifdef Q_OS_MAC
QString QCoreApplicationPrivate::macMenuBarName()
{
QString bundleName;
CFTypeRef string = CFBundleGetValueForInfoDictionaryKey(CFBundleGetMainBundle(), CFSTR("CFBundleName"));
if (string)
bundleName = QCFString::toQString(static_cast<CFStringRef>(string));
return bundleName;
}
#endif
QString QCoreApplicationPrivate::appName() const
{
static QString applName;
#ifdef Q_OS_MAC
applName = macMenuBarName();
#endif
if (applName.isEmpty() && argv[0]) {
char *p = strrchr(argv[0], '/');
applName = QString::fromLocal8Bit(p ? p + 1 : argv[0]);
}
return applName;
}
#endif
bool QCoreApplicationPrivate::checkInstance(const char *function)
{
bool b = (QCoreApplication::self != 0);
if (!b)
qWarning("QApplication::%s: Please instantiate the QApplication object first", function);
return b;
}
// Support for introspection
QSignalSpyCallbackSet Q_CORE_EXPORT qt_signal_spy_callback_set = { 0, 0, 0, 0 };
void qt_register_signal_spy_callbacks(const QSignalSpyCallbackSet &callback_set)
{
qt_signal_spy_callback_set = callback_set;
}
extern "C" void Q_CORE_EXPORT qt_startup_hook()
{
}
typedef QList<QtCleanUpFunction> QVFuncList;
Q_GLOBAL_STATIC(QVFuncList, postRList)
void qAddPostRoutine(QtCleanUpFunction p)
{
QVFuncList *list = postRList();
if (!list)
return;
list->prepend(p);
}
void qRemovePostRoutine(QtCleanUpFunction p)
{
QVFuncList *list = postRList();
if (!list)
return;
list->removeAll(p);
}
void Q_CORE_EXPORT qt_call_post_routines()
{
QVFuncList *list = 0;
QT_TRY {
list = postRList();
} QT_CATCH(const std::bad_alloc &) {
// ignore - if we can't allocate a post routine list,
// there's a high probability that there's no post
// routine to be executed :)
}
if (!list)
return;
while (!list->isEmpty())
(list->takeFirst())();
}
// app starting up if false
bool QCoreApplicationPrivate::is_app_running = false;
// app closing down if true
bool QCoreApplicationPrivate::is_app_closing = false;
// initialized in qcoreapplication and in qtextstream autotest when setlocale is called.
Q_CORE_EXPORT bool qt_locale_initialized = false;
Q_CORE_EXPORT uint qGlobalPostedEventsCount()
{
QThreadData *currentThreadData = QThreadData::current();
return currentThreadData->postEventList.size() - currentThreadData->postEventList.startOffset;
}
void qt_set_current_thread_to_main_thread()
{
QCoreApplicationPrivate::theMainThread = QThread::currentThread();
}
QCoreApplication *QCoreApplication::self = 0;
QAbstractEventDispatcher *QCoreApplicationPrivate::eventDispatcher = 0;
uint QCoreApplicationPrivate::attribs;
#ifdef Q_OS_UNIX
Qt::HANDLE qt_application_thread_id = 0;
#endif
struct QCoreApplicationData {
QCoreApplicationData() {
#ifndef QT_NO_LIBRARY
app_libpaths = 0;
#endif
}
~QCoreApplicationData() {
#ifndef QT_NO_LIBRARY
delete app_libpaths;
#endif
// cleanup the QAdoptedThread created for the main() thread
if (QCoreApplicationPrivate::theMainThread) {
QThreadData *data = QThreadData::get2(QCoreApplicationPrivate::theMainThread);
QCoreApplicationPrivate::theMainThread = 0;
data->deref(); // deletes the data and the adopted thread
}
}
QString orgName, orgDomain, application;
QString applicationVersion;
#ifndef QT_NO_LIBRARY
QStringList *app_libpaths;
#endif
};
Q_GLOBAL_STATIC(QCoreApplicationData, coreappdata)
QCoreApplicationPrivate::QCoreApplicationPrivate(int &aargc, char **aargv)
: QObjectPrivate(), argc(aargc), argv(aargv), application_type(0), eventFilter(0),
in_exec(false), aboutToQuitEmitted(false)
{
static const char *const empty = "";
if (argc == 0 || argv == 0) {
argc = 0;
argv = (char **)∅ // ouch! careful with QCoreApplication::argv()!
}
QCoreApplicationPrivate::is_app_closing = false;
#ifdef Q_OS_UNIX
qt_application_thread_id = QThread::currentThreadId();
#endif
// note: this call to QThread::currentThread() may end up setting theMainThread!
if (QThread::currentThread() != theMainThread)
qWarning("WARNING: QApplication was not created in the main() thread.");
}
QCoreApplicationPrivate::~QCoreApplicationPrivate()
{
if (threadData) {
#ifndef QT_NO_THREAD
void *data = &threadData->tls;
QThreadStorageData::finish((void **)data);
#endif
// need to clear the state of the mainData, just in case a new QCoreApplication comes along.
QMutexLocker locker(&threadData->postEventList.mutex);
for (int i = 0; i < threadData->postEventList.size(); ++i) {
const QPostEvent &pe = threadData->postEventList.at(i);
if (pe.event) {
--pe.receiver->d_func()->postedEvents;
pe.event->posted = false;
delete pe.event;
}
}
threadData->postEventList.clear();
threadData->postEventList.recursion = 0;
threadData->quitNow = false;
}
}
void QCoreApplicationPrivate::createEventDispatcher()
{
Q_Q(QCoreApplication);
#if defined(Q_OS_SYMBIAN)
eventDispatcher = new QEventDispatcherSymbian(q);
#elif defined(Q_OS_UNIX)
# if !defined(QT_NO_GLIB)
if (qgetenv("QT_NO_GLIB").isEmpty() && QEventDispatcherGlib::versionSupported())
eventDispatcher = new QEventDispatcherGlib(q);
else
# endif
eventDispatcher = new QEventDispatcherUNIX(q);
#elif defined(Q_OS_WIN)
eventDispatcher = new QEventDispatcherWin32(q);
#else
# error "QEventDispatcher not yet ported to this platform"
#endif
}
QThread *QCoreApplicationPrivate::theMainThread = 0;
QThread *QCoreApplicationPrivate::mainThread()
{
Q_ASSERT(theMainThread != 0);
return theMainThread;
}
#if !defined (QT_NO_DEBUG) || defined (QT_MAC_FRAMEWORK_BUILD)
void QCoreApplicationPrivate::checkReceiverThread(QObject *receiver)
{
QThread *currentThread = QThread::currentThread();
QThread *thr = receiver->thread();
Q_ASSERT_X(currentThread == thr || !thr,
"QCoreApplication::sendEvent",
QString::fromLatin1("Cannot send events to objects owned by a different thread. "
"Current thread %1. Receiver '%2' (of type '%3') was created in thread %4")
.arg(QString::number((quintptr) currentThread, 16))
.arg(receiver->objectName())
.arg(QLatin1String(receiver->metaObject()->className()))
.arg(QString::number((quintptr) thr, 16))
.toLocal8Bit().data());
Q_UNUSED(currentThread);
Q_UNUSED(thr);
}
#elif defined(Q_OS_SYMBIAN) && defined (QT_NO_DEBUG)
// no implementation in release builds, but keep the symbol present
void QCoreApplicationPrivate::checkReceiverThread(QObject * /* receiver */)
{
}
#endif
void QCoreApplicationPrivate::appendApplicationPathToLibraryPaths()
{
#if !defined(QT_NO_LIBRARY) && !defined(QT_NO_SETTINGS)
QStringList *app_libpaths = coreappdata()->app_libpaths;
Q_ASSERT(app_libpaths);
# if defined(Q_OS_SYMBIAN)
QString app_location( QCoreApplication::applicationDirPath() );
// File existence check for application's private dir requires additional '\' or
// platform security will not allow it.
if (app_location != QLibraryInfo::location(QLibraryInfo::PluginsPath) && QFile::exists(app_location + QLatin1Char('\\')) && !app_libpaths->contains(app_location))
# else
QString app_location( QCoreApplication::applicationFilePath() );
app_location.truncate(app_location.lastIndexOf(QLatin1Char('/')));
app_location = QDir(app_location).canonicalPath();
if (QFile::exists(app_location) && !app_libpaths->contains(app_location))
# endif
app_libpaths->append(app_location);
#endif
}
QString qAppName()
{
if (!QCoreApplicationPrivate::checkInstance("qAppName"))
return QString();
return QCoreApplication::instance()->d_func()->appName();
}
/*!
\class QCoreApplication
\brief The QCoreApplication class provides an event loop for console Qt
applications.
This class is used by non-GUI applications to provide their event
loop. For non-GUI application that uses Qt, there should be exactly
one QCoreApplication object. For GUI applications, see
QApplication.
QCoreApplication contains the main event loop, where all events
from the operating system (e.g., timer and network events) and
other sources are processed and dispatched. It also handles the
application's initialization and finalization, as well as
system-wide and application-wide settings.
\section1 The Event Loop and Event Handling
The event loop is started with a call to exec(). Long running
operations can call processEvents() to keep the application
responsive.
Some Qt classes, such as QString, can be used without a
QCoreApplication object. However, in general, we recommend that
you create a QCoreApplication or a QApplication object in your \c
main() function as early as possible. exit() will not return
until the event loop exits; e.g., when quit() is called.
Several static convenience functions are also provided. The
QCoreApplication object is available from instance(). Events can
be sent or posted using sendEvent(), postEvent(), and
sendPostedEvents(). Pending events can be removed with
removePostedEvents() or flushed with flush().
The class provides a quit() slot and an aboutToQuit() signal.
\section1 Application and Library Paths
An application has an applicationDirPath() and an
applicationFilePath(). Library paths (see QLibrary) can be retrieved
with libraryPaths() and manipulated by setLibraryPaths(), addLibraryPath(),
and removeLibraryPath().
\section1 Internationalization and Translations
Translation files can be added or removed
using installTranslator() and removeTranslator(). Application
strings can be translated using translate(). The QObject::tr()
and QObject::trUtf8() functions are implemented in terms of
translate().
\section1 Accessing Command Line Arguments
The command line arguments which are passed to QCoreApplication's
constructor should be accessed using the arguments() function.
Note that some arguments supplied by the user may have been
processed and removed by QCoreApplication.
In cases where command line arguments need to be obtained using the
argv() function, you must convert them from the local string encoding
using QString::fromLocal8Bit().
\section1 Locale Settings
On Unix/Linux Qt is configured to use the system locale settings by
default. This can cause a conflict when using POSIX functions, for
instance, when converting between data types such as floats and
strings, since the notation may differ between locales. To get
around this problem, call the POSIX function \c{setlocale(LC_NUMERIC,"C")}
right after initializing QApplication or QCoreApplication to reset
the locale that is used for number formatting to "C"-locale.
\sa QApplication, QAbstractEventDispatcher, QEventLoop,
{Semaphores Example}, {Wait Conditions Example}
*/
/*!
\fn static QCoreApplication *QCoreApplication::instance()
Returns a pointer to the application's QCoreApplication (or
QApplication) instance.
If no instance has been allocated, \c null is returned.
*/
/*!\internal
*/
QCoreApplication::QCoreApplication(QCoreApplicationPrivate &p)
: QObject(p, 0)
{
init();
// note: it is the subclasses' job to call
// QCoreApplicationPrivate::eventDispatcher->startingUp();
}
/*!
Flushes the platform specific event queues.
If you are doing graphical changes inside a loop that does not
return to the event loop on asynchronous window systems like X11
or double buffered window systems like Mac OS X, and you want to
visualize these changes immediately (e.g. Splash Screens), call
this function.
\sa sendPostedEvents()
*/
void QCoreApplication::flush()
{
if (self && self->d_func()->eventDispatcher)
self->d_func()->eventDispatcher->flush();
}
/*!
Constructs a Qt kernel application. Kernel applications are
applications without a graphical user interface. These type of
applications are used at the console or as server processes.
The \a argc and \a argv arguments are processed by the application,
and made available in a more convenient form by the arguments()
function.
\warning The data referred to by \a argc and \a argv must stay valid
for the entire lifetime of the QCoreApplication object. In addition,
\a argc must be greater than zero and \a argv must contain at least
one valid character string.
*/
QCoreApplication::QCoreApplication(int &argc, char **argv)
: QObject(*new QCoreApplicationPrivate(argc, argv))
{
init();
QCoreApplicationPrivate::eventDispatcher->startingUp();
#if defined(Q_OS_SYMBIAN) && !defined(QT_NO_LIBRARY) && !defined(QT_NO_SETTINGS)
// Refresh factoryloader, as text codecs are requested during lib path
// resolving process and won't be therefore properly loaded.
// Unknown if this is symbian specific issue.
QFactoryLoader::refreshAll();
#endif
}
extern void set_winapp_name();
// ### move to QCoreApplicationPrivate constructor?
void QCoreApplication::init()
{
Q_D(QCoreApplication);
#ifdef Q_OS_UNIX
setlocale(LC_ALL, ""); // use correct char set mapping
qt_locale_initialized = true;
#endif
#ifdef Q_WS_WIN
// Get the application name/instance if qWinMain() was not invoked
set_winapp_name();
#endif
Q_ASSERT_X(!self, "QCoreApplication", "there should be only one application object");
QCoreApplication::self = this;
#ifndef QT_NO_THREAD
QThread::initialize();
#endif
// use the event dispatcher created by the app programmer (if any)
if (!QCoreApplicationPrivate::eventDispatcher)
QCoreApplicationPrivate::eventDispatcher = d->threadData->eventDispatcher;
// otherwise we create one
if (!QCoreApplicationPrivate::eventDispatcher)
d->createEventDispatcher();
Q_ASSERT(QCoreApplicationPrivate::eventDispatcher != 0);
if (!QCoreApplicationPrivate::eventDispatcher->parent())
QCoreApplicationPrivate::eventDispatcher->moveToThread(d->threadData->thread);
d->threadData->eventDispatcher = QCoreApplicationPrivate::eventDispatcher;
#if !defined(QT_NO_LIBRARY) && !defined(QT_NO_SETTINGS)
if (!coreappdata()->app_libpaths) {
// make sure that library paths is initialized
libraryPaths();
} else {
d->appendApplicationPathToLibraryPaths();
}
#endif
#if defined(Q_OS_UNIX) && !(defined(QT_NO_PROCESS))
// Make sure the process manager thread object is created in the main
// thread.
QProcessPrivate::initializeProcessManager();
#endif
#ifdef QT_EVAL
extern void qt_core_eval_init(uint);
qt_core_eval_init(d->application_type);
#endif
qt_startup_hook();
}
/*!
Destroys the QCoreApplication object.
*/
QCoreApplication::~QCoreApplication()
{
qt_call_post_routines();
self = 0;
QCoreApplicationPrivate::is_app_closing = true;
QCoreApplicationPrivate::is_app_running = false;
#if !defined(QT_NO_THREAD)
#if !defined(QT_NO_CONCURRENT)
// Synchronize and stop the global thread pool threads.
QThreadPool *globalThreadPool = 0;
QT_TRY {
globalThreadPool = QThreadPool::globalInstance();
} QT_CATCH (...) {
// swallow the exception, since destructors shouldn't throw
}
if (globalThreadPool)
globalThreadPool->waitForDone();
#endif
QThread::cleanup();
#endif
d_func()->threadData->eventDispatcher = 0;
if (QCoreApplicationPrivate::eventDispatcher)
QCoreApplicationPrivate::eventDispatcher->closingDown();
QCoreApplicationPrivate::eventDispatcher = 0;
#ifndef QT_NO_LIBRARY
delete coreappdata()->app_libpaths;
coreappdata()->app_libpaths = 0;
#endif
}
/*!
Sets the attribute \a attribute if \a on is true;
otherwise clears the attribute.
One of the attributes that can be set with this method is
Qt::AA_ImmediateWidgetCreation. It tells Qt to create toplevel
windows immediately. Normally, resources for widgets are allocated
on demand to improve efficiency and minimize resource usage.
Therefore, if it is important to minimize resource consumption, do
not set this attribute.
\sa testAttribute()
*/
void QCoreApplication::setAttribute(Qt::ApplicationAttribute attribute, bool on)
{
if (on)
QCoreApplicationPrivate::attribs |= 1 << attribute;
else
QCoreApplicationPrivate::attribs &= ~(1 << attribute);
#ifdef Q_OS_MAC
// Turn on the no native menubar here, since we used to
// do this implicitly. We DO NOT flip it off if someone sets
// it to false.
// Ideally, we'd have magic that would be something along the lines of
// "follow MacPluginApplication" unless explicitly set.
// Considering this attribute isn't only at the beginning
// it's unlikely it will ever be a problem, but I want
// to have the behavior documented here.
if (attribute == Qt::AA_MacPluginApplication && on
&& !testAttribute(Qt::AA_DontUseNativeMenuBar)) {
setAttribute(Qt::AA_DontUseNativeMenuBar, true);
}
#endif
}
/*!
Returns true if attribute \a attribute is set;
otherwise returns false.
\sa setAttribute()
*/
bool QCoreApplication::testAttribute(Qt::ApplicationAttribute attribute)
{
return QCoreApplicationPrivate::testAttribute(attribute);
}
/*!
\internal
This function is here to make it possible for Qt extensions to
hook into event notification without subclassing QApplication
*/
bool QCoreApplication::notifyInternal(QObject *receiver, QEvent *event)
{
// Make it possible for Qt Jambi and QSA to hook into events even
// though QApplication is subclassed...
bool result = false;
void *cbdata[] = { receiver, event, &result };
if (QInternal::activateCallbacks(QInternal::EventNotifyCallback, cbdata)) {
return result;
}
// Qt enforces the rule that events can only be sent to objects in
// the current thread, so receiver->d_func()->threadData is
// equivalent to QThreadData::current(), just without the function
// call overhead.
QObjectPrivate *d = receiver->d_func();
QThreadData *threadData = d->threadData;
++threadData->loopLevel;
#ifdef QT_JAMBI_BUILD
int deleteWatch = 0;
int *oldDeleteWatch = QObjectPrivate::setDeleteWatch(d, &deleteWatch);
bool inEvent = d->inEventHandler;
d->inEventHandler = true;
#endif
bool returnValue;
QT_TRY {
returnValue = notify(receiver, event);
} QT_CATCH (...) {
--threadData->loopLevel;
QT_RETHROW;
}
#ifdef QT_JAMBI_BUILD
// Restore the previous state if the object was not deleted..
if (!deleteWatch) {
d->inEventHandler = inEvent;
}
QObjectPrivate::resetDeleteWatch(d, oldDeleteWatch, deleteWatch);
#endif
--threadData->loopLevel;
return returnValue;
}
/*!
Sends \a event to \a receiver: \a {receiver}->event(\a event).
Returns the value that is returned from the receiver's event
handler. Note that this function is called for all events sent to
any object in any thread.
For certain types of events (e.g. mouse and key events),
the event will be propagated to the receiver's parent and so on up to
the top-level object if the receiver is not interested in the event
(i.e., it returns false).
There are five different ways that events can be processed;
reimplementing this virtual function is just one of them. All five
approaches are listed below:
\list 1
\i Reimplementing paintEvent(), mousePressEvent() and so
on. This is the commonest, easiest and least powerful way.
\i Reimplementing this function. This is very powerful, providing
complete control; but only one subclass can be active at a time.
\i Installing an event filter on QCoreApplication::instance(). Such
an event filter is able to process all events for all widgets, so
it's just as powerful as reimplementing notify(); furthermore, it's
possible to have more than one application-global event filter.
Global event filters even see mouse events for
\l{QWidget::isEnabled()}{disabled widgets}. Note that application
event filters are only called for objects that live in the main
thread.
\i Reimplementing QObject::event() (as QWidget does). If you do
this you get Tab key presses, and you get to see the events before
any widget-specific event filters.
\i Installing an event filter on the object. Such an event filter gets all
the events, including Tab and Shift+Tab key press events, as long as they
do not change the focus widget.
\endlist
\sa QObject::event(), installEventFilter()
*/
bool QCoreApplication::notify(QObject *receiver, QEvent *event)
{
Q_D(QCoreApplication);
// no events are delivered after ~QCoreApplication() has started
if (QCoreApplicationPrivate::is_app_closing)
return true;
if (receiver == 0) { // serious error
qWarning("QCoreApplication::notify: Unexpected null receiver");
return true;
}
#ifndef QT_NO_DEBUG
d->checkReceiverThread(receiver);
#endif
#ifdef QT3_SUPPORT
if (event->type() == QEvent::ChildRemoved && !receiver->d_func()->pendingChildInsertedEvents.isEmpty())
receiver->d_func()->removePendingChildInsertedEvents(static_cast<QChildEvent *>(event)->child());
#endif // QT3_SUPPORT
return receiver->isWidgetType() ? false : d->notify_helper(receiver, event);
}
bool QCoreApplicationPrivate::sendThroughApplicationEventFilters(QObject *receiver, QEvent *event)
{
if (receiver->d_func()->threadData == this->threadData) {
// application event filters are only called for objects in the GUI thread
for (int i = 0; i < eventFilters.size(); ++i) {
register QObject *obj = eventFilters.at(i);
if (!obj)
continue;
if (obj->d_func()->threadData != threadData) {
qWarning("QCoreApplication: Application event filter cannot be in a different thread.");
continue;
}
if (obj->eventFilter(receiver, event))
return true;
}
}
return false;
}
bool QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject *receiver, QEvent *event)
{
Q_Q(QCoreApplication);
if (receiver != q) {
for (int i = 0; i < receiver->d_func()->eventFilters.size(); ++i) {
register QObject *obj = receiver->d_func()->eventFilters.at(i);
if (!obj)
continue;
if (obj->d_func()->threadData != receiver->d_func()->threadData) {
qWarning("QCoreApplication: Object event filter cannot be in a different thread.");
continue;
}
if (obj->eventFilter(receiver, event))
return true;
}
}
return false;
}
/*!\internal
Helper function called by notify()
*/
bool QCoreApplicationPrivate::notify_helper(QObject *receiver, QEvent * event)
{
// send to all application event filters
if (sendThroughApplicationEventFilters(receiver, event))
return true;
// send to all receiver event filters
if (sendThroughObjectEventFilters(receiver, event))
return true;
// deliver the event
return receiver->event(event);
}
/*!
Returns true if an application object has not been created yet;
otherwise returns false.
\sa closingDown()
*/
bool QCoreApplication::startingUp()
{
return !QCoreApplicationPrivate::is_app_running;
}
/*!
Returns true if the application objects are being destroyed;
otherwise returns false.
\sa startingUp()
*/
bool QCoreApplication::closingDown()
{
return QCoreApplicationPrivate::is_app_closing;
}
/*!
Processes all pending events for the calling thread according to
the specified \a flags until there are no more events to process.
You can call this function occasionally when your program is busy
performing a long operation (e.g. copying a file).
In event you are running a local loop which calls this function
continuously, without an event loop, the
\l{QEvent::DeferredDelete}{DeferredDelete} events will
not be processed. This can affect the behaviour of widgets,
e.g. QToolTip, that rely on \l{QEvent::DeferredDelete}{DeferredDelete}
events to function properly. An alternative would be to call
\l{QCoreApplication::sendPostedEvents()}{sendPostedEvents()} from
within that local loop.
Calling this function processes events only for the calling thread.
\threadsafe
\sa exec(), QTimer, QEventLoop::processEvents(), flush(), sendPostedEvents()
*/
void QCoreApplication::processEvents(QEventLoop::ProcessEventsFlags flags)
{
QThreadData *data = QThreadData::current();
if (!data->eventDispatcher)
return;
if (flags & QEventLoop::DeferredDeletion)
QCoreApplication::sendPostedEvents(0, QEvent::DeferredDelete);
data->eventDispatcher->processEvents(flags);
}
/*!
\overload processEvents()
Processes pending events for the calling thread for \a maxtime
milliseconds or until there are no more events to process,
whichever is shorter.
You can call this function occasionally when you program is busy
doing a long operation (e.g. copying a file).
Calling this function processes events only for the calling thread.
\threadsafe
\sa exec(), QTimer, QEventLoop::processEvents()
*/
void QCoreApplication::processEvents(QEventLoop::ProcessEventsFlags flags, int maxtime)
{
QThreadData *data = QThreadData::current();
if (!data->eventDispatcher)
return;
QTime start;
start.start();
if (flags & QEventLoop::DeferredDeletion)
QCoreApplication::sendPostedEvents(0, QEvent::DeferredDelete);
while (data->eventDispatcher->processEvents(flags & ~QEventLoop::WaitForMoreEvents)) {
if (start.elapsed() > maxtime)
break;
if (flags & QEventLoop::DeferredDeletion)
QCoreApplication::sendPostedEvents(0, QEvent::DeferredDelete);
}
}
/*****************************************************************************
Main event loop wrappers
*****************************************************************************/
/*!
Enters the main event loop and waits until exit() is called.
Returns the value that was set to exit() (which is 0 if exit() is
called via quit()).
It is necessary to call this function to start event handling. The
main event loop receives events from the window system and
dispatches these to the application widgets.
To make your application perform idle processing (i.e. executing a
special function whenever there are no pending events), use a
QTimer with 0 timeout. More advanced idle processing schemes can
be achieved using processEvents().
We recommend that you connect clean-up code to the
\l{QCoreApplication::}{aboutToQuit()} signal, instead of putting it in
your application's \c{main()} function because on some platforms the
QCoreApplication::exec() call may not return. For example, on Windows
when the user logs off, the system terminates the process after Qt
closes all top-level windows. Hence, there is no guarantee that the
application will have time to exit its event loop and execute code at
the end of the \c{main()} function after the QCoreApplication::exec()
call.
\sa quit(), exit(), processEvents(), QApplication::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;
}
/*!
Tells the application to exit with a return code.
After this function has been called, the application leaves the
main event loop and returns from the call to exec(). The exec()
function returns \a returnCode. If the event loop is not running,
this function does nothing.
By convention, a \a returnCode of 0 means success, and any non-zero
value indicates an error.
Note that unlike the C library function of the same name, this
function \e does return to the caller -- it is event processing that
stops.
\sa quit(), exec()
*/
void QCoreApplication::exit(int returnCode)
{
if (!self)
return;
QThreadData *data = self->d_func()->threadData;
data->quitNow = true;
for (int i = 0; i < data->eventLoops.size(); ++i) {
QEventLoop *eventLoop = data->eventLoops.at(i);
eventLoop->exit(returnCode);
}
}
/*****************************************************************************
QCoreApplication management of posted events
*****************************************************************************/
/*!
\fn bool QCoreApplication::sendEvent(QObject *receiver, QEvent *event)
Sends event \a event directly to receiver \a receiver, using the
notify() function. Returns the value that was returned from the
event handler.
The event is \e not deleted when the event has been sent. The normal
approach is to create the event on the stack, for example:
\snippet doc/src/snippets/code/src_corelib_kernel_qcoreapplication.cpp 0
\sa postEvent(), notify()
*/
/*!
Adds the event \a event, with the object \a receiver as the
receiver of the event, to an event queue and returns immediately.
The event must be allocated on the heap since the post event queue
will take ownership of the event and delete it once it has been
posted. It is \e {not safe} to modify or delete the event after
it has been posted.
When control returns to the main event loop, all events that are
stored in the queue will be sent using the notify() function.
Events are processed in the order posted. For more control over
the processing order, use the postEvent() overload below, which
takes a priority argument. This function posts all event with a
Qt::NormalEventPriority.
\threadsafe
\sa sendEvent(), notify(), sendPostedEvents()
*/
void QCoreApplication::postEvent(QObject *receiver, QEvent *event)
{
postEvent(receiver, event, Qt::NormalEventPriority);
}
/*!
\overload postEvent()
\since 4.3
Adds the event \a event, with the object \a receiver as the
receiver of the event, to an event queue and returns immediately.
The event must be allocated on the heap since the post event queue
will take ownership of the event and delete it once it has been
posted. It is \e {not safe} to modify or delete the event after
it has been posted.
When control returns to the main event loop, all events that are
stored in the queue will be sent using the notify() function.
Events are sorted in descending \a priority order, i.e. events
with a high \a priority are queued before events with a lower \a
priority. The \a priority can be any integer value, i.e. between
INT_MAX and INT_MIN, inclusive; see Qt::EventPriority for more
details. Events with equal \a priority will be processed in the
order posted.
\threadsafe
\sa sendEvent(), notify(), sendPostedEvents(), Qt::EventPriority
*/
void QCoreApplication::postEvent(QObject *receiver, QEvent *event, int priority)
{
if (receiver == 0) {
qWarning("QCoreApplication::postEvent: Unexpected null receiver");
delete event;
return;
}
QThreadData * volatile * pdata = &receiver->d_func()->threadData;
QThreadData *data = *pdata;
if (!data) {
// posting during destruction? just delete the event to prevent a leak
delete event;
return;
}
// lock the post event mutex
data->postEventList.mutex.lock();
// if object has moved to another thread, follow it
while (data != *pdata) {
data->postEventList.mutex.unlock();
data = *pdata;
if (!data) {
// posting during destruction? just delete the event to prevent a leak
delete event;
return;
}
data->postEventList.mutex.lock();
}
QMutexUnlocker locker(&data->postEventList.mutex);
// if this is one of the compressible events, do compression
if (receiver->d_func()->postedEvents
&& self && self->compressEvent(event, receiver, &data->postEventList)) {
return;
}
if (event->type() == QEvent::DeferredDelete && data == QThreadData::current()) {
// remember the current running eventloop for DeferredDelete
// events posted in the receiver's thread
event->d = reinterpret_cast<QEventPrivate *>(quintptr(data->loopLevel));
}
// delete the event on exceptions to protect against memory leaks till the event is
// properly owned in the postEventList
QScopedPointer<QEvent> eventDeleter(event);
if (data->postEventList.isEmpty() || data->postEventList.last().priority >= priority) {
// optimization: we can simply append if the last event in
// the queue has higher or equal priority
data->postEventList.append(QPostEvent(receiver, event, priority));
} else {
// insert event in descending priority order, using upper
// bound for a given priority (to ensure proper ordering
// of events with the same priority)
QPostEventList::iterator begin = data->postEventList.begin()
+ data->postEventList.insertionOffset,
end = data->postEventList.end();
QPostEventList::iterator at = qUpperBound(begin, end, priority);
data->postEventList.insert(at, QPostEvent(receiver, event, priority));
}
eventDeleter.take();
event->posted = true;
++receiver->d_func()->postedEvents;
data->canWait = false;
locker.unlock();
if (data->eventDispatcher)
data->eventDispatcher->wakeUp();
}
/*!
\internal
Returns true if \a event was compressed away (possibly deleted) and should not be added to the list.
*/
bool QCoreApplication::compressEvent(QEvent *event, QObject *receiver, QPostEventList *postedEvents)
{
#ifdef Q_WS_WIN
Q_ASSERT(event);
Q_ASSERT(receiver);
Q_ASSERT(postedEvents);
// compress posted timers to this object.
if (event->type() == QEvent::Timer && receiver->d_func()->postedEvents > 0) {
int timerId = ((QTimerEvent *) event)->timerId();
for (int i=0; i<postedEvents->size(); ++i) {
const QPostEvent &e = postedEvents->at(i);
if (e.receiver == receiver && e.event && e.event->type() == QEvent::Timer
&& ((QTimerEvent *) e.event)->timerId() == timerId) {
delete event;
return true;
}
}
} else
#endif
if ((event->type() == QEvent::DeferredDelete
|| event->type() == QEvent::Quit)
&& receiver->d_func()->postedEvents > 0) {
for (int i = 0; i < postedEvents->size(); ++i) {
const QPostEvent &cur = postedEvents->at(i);
if (cur.receiver != receiver
|| cur.event == 0
|| cur.event->type() != event->type())
continue;
// found an event for this receiver
delete event;
return true;
}
}
return false;
}
/*!
\fn void QCoreApplication::sendPostedEvents()
\overload sendPostedEvents()
Dispatches all posted events, i.e. empties the event queue.
*/
/*!
Immediately dispatches all events which have been previously queued
with QCoreApplication::postEvent() and which are for the object \a receiver
and have the event type \a event_type.
Events from the window system are \e not dispatched by this
function, but by processEvents().
If \a receiver is null, the events of \a event_type are sent for all
objects. If \a event_type is 0, all the events are sent for \a receiver.
\note This method must be called from the same thread as its QObject parameter, \a receiver.
\sa flush(), postEvent()
*/
void QCoreApplication::sendPostedEvents(QObject *receiver, int event_type)
{
QThreadData *data = QThreadData::current();
QCoreApplicationPrivate::sendPostedEvents(receiver, event_type, data);
}
void QCoreApplicationPrivate::sendPostedEvents(QObject *receiver, int event_type,
QThreadData *data)
{
if (event_type == -1) {
// we were called by an obsolete event dispatcher.
event_type = 0;
}
if (receiver && receiver->d_func()->threadData != data) {
qWarning("QCoreApplication::sendPostedEvents: Cannot send "
"posted events for objects in another thread");
return;
}
++data->postEventList.recursion;
#ifdef QT3_SUPPORT
if (event_type == QEvent::ChildInserted) {
if (receiver) {
// optimize sendPostedEvents(w, QEvent::ChildInserted) calls away
receiver->d_func()->sendPendingChildInsertedEvents();
--data->postEventList.recursion;
return;
}
// ChildInserted events are sent in response to *Request
event_type = QEvent::ChildInsertedRequest;
}
#endif
QMutexLocker locker(&data->postEventList.mutex);
// by default, we assume that the event dispatcher can go to sleep after
// processing all events. if any new events are posted while we send
// events, canWait will be set to false.
data->canWait = (data->postEventList.size() == 0);
if (data->postEventList.size() == 0 || (receiver && !receiver->d_func()->postedEvents)) {
--data->postEventList.recursion;
return;
}
data->canWait = true;
// okay. here is the tricky loop. be careful about optimizing
// this, it looks the way it does for good reasons.
int startOffset = data->postEventList.startOffset;
int &i = (!event_type && !receiver) ? data->postEventList.startOffset : startOffset;
data->postEventList.insertionOffset = data->postEventList.size();
while (i < data->postEventList.size()) {
// avoid live-lock
if (i >= data->postEventList.insertionOffset)
break;
const QPostEvent &pe = data->postEventList.at(i);
++i;
if (!pe.event)
continue;
if ((receiver && receiver != pe.receiver) || (event_type && event_type != pe.event->type())) {
data->canWait = false;
continue;
}
if (pe.event->type() == QEvent::DeferredDelete) {
// DeferredDelete events are only sent when we are explicitly asked to
// (s.a. QEvent::DeferredDelete), and then only if the event loop that
// posted the event has returned.
const bool allowDeferredDelete =
(quintptr(pe.event->d) > unsigned(data->loopLevel)
|| (!quintptr(pe.event->d) && data->loopLevel > 0)
|| (event_type == QEvent::DeferredDelete
&& quintptr(pe.event->d) == unsigned(data->loopLevel)));
if (!allowDeferredDelete) {
// cannot send deferred delete
if (!event_type && !receiver) {
// don't lose the event
data->postEventList.append(pe);
const_cast<QPostEvent &>(pe).event = 0;
}
continue;
}
}
// first, we diddle the event so that we can deliver
// it, and that no one will try to touch it later.
pe.event->posted = false;
QEvent * e = pe.event;
QObject * r = pe.receiver;
--r->d_func()->postedEvents;
Q_ASSERT(r->d_func()->postedEvents >= 0);
// next, update the data structure so that we're ready
// for the next event.
const_cast<QPostEvent &>(pe).event = 0;
locker.unlock();
// after all that work, it's time to deliver the event.
#ifdef QT_NO_EXCEPTIONS
QCoreApplication::sendEvent(r, e);
#else
try {
QCoreApplication::sendEvent(r, e);
} catch (...) {
delete e;
locker.relock();
// since we were interrupted, we need another pass to make sure we clean everything up
data->canWait = false;
// uglehack: copied from below
--data->postEventList.recursion;
if (!data->postEventList.recursion && !data->canWait && data->eventDispatcher)
data->eventDispatcher->wakeUp();
throw; // rethrow
}
#endif
delete e;
locker.relock();
// careful when adding anything below this point - the
// sendEvent() call might invalidate any invariants this
// function depends on.
}
--data->postEventList.recursion;
if (!data->postEventList.recursion && !data->canWait && data->eventDispatcher)
data->eventDispatcher->wakeUp();
// clear the global list, i.e. remove everything that was
// delivered.
if (!event_type && !receiver && data->postEventList.startOffset >= 0) {
const QPostEventList::iterator it = data->postEventList.begin();
data->postEventList.erase(it, it + data->postEventList.startOffset);
data->postEventList.insertionOffset -= data->postEventList.startOffset;
Q_ASSERT(data->postEventList.insertionOffset >= 0);
data->postEventList.startOffset = 0;
}
}
/*!
Removes all events posted using postEvent() for \a receiver.
The events are \e not dispatched, instead they are removed from the
queue. You should never need to call this function. If you do call it,
be aware that killing events may cause \a receiver to break one or
more invariants.
\threadsafe
*/
void QCoreApplication::removePostedEvents(QObject *receiver)
{
removePostedEvents(receiver, 0);
}
/*!
\overload removePostedEvents()
\since 4.3
Removes all events of the given \a eventType that were posted
using postEvent() for \a receiver.
The events are \e not dispatched, instead they are removed from
the queue. You should never need to call this function. If you do
call it, be aware that killing events may cause \a receiver to
break one or more invariants.
If \a receiver is null, the events of \a eventType are removed for
all objects. If \a eventType is 0, all the events are removed for
\a receiver.
\threadsafe
*/
void QCoreApplication::removePostedEvents(QObject *receiver, int eventType)
{
#ifdef QT3_SUPPORT
if (eventType == QEvent::ChildInserted)
eventType = QEvent::ChildInsertedRequest;
#endif
QThreadData *data = receiver ? receiver->d_func()->threadData : QThreadData::current();
QMutexLocker locker(&data->postEventList.mutex);
// the QObject destructor calls this function directly. this can
// happen while the event loop is in the middle of posting events,
// and when we get here, we may not have any more posted events
// for this object.
if (receiver && !receiver->d_func()->postedEvents)
return;
//we will collect all the posted events for the QObject
//and we'll delete after the mutex was unlocked
QVarLengthArray<QEvent*> events;
int n = data->postEventList.size();
int j = 0;
for (int i = 0; i < n; ++i) {
const QPostEvent &pe = data->postEventList.at(i);
if ((!receiver || pe.receiver == receiver)
&& (pe.event && (eventType == 0 || pe.event->type() == eventType))) {
--pe.receiver->d_func()->postedEvents;
#ifdef QT3_SUPPORT
if (pe.event->type() == QEvent::ChildInsertedRequest)
pe.receiver->d_func()->removePendingChildInsertedEvents(0);
#endif
pe.event->posted = false;
events.append(pe.event);
const_cast<QPostEvent &>(pe).event = 0;
} else if (!data->postEventList.recursion) {
if (i != j)
data->postEventList.swap(i, j);
++j;
}
}
#ifdef QT_DEBUG
if (receiver && eventType == 0) {
Q_ASSERT(!receiver->d_func()->postedEvents);
}
#endif
if (!data->postEventList.recursion) {
// truncate list
data->postEventList.erase(data->postEventList.begin() + j, data->postEventList.end());
}
locker.unlock();
for (int i = 0; i < events.count(); ++i) {
delete events[i];
}
}
/*!
Removes \a event from the queue of posted events, and emits a
warning message if appropriate.
\warning This function can be \e really slow. Avoid using it, if
possible.
\threadsafe
*/
void QCoreApplicationPrivate::removePostedEvent(QEvent * event)
{
if (!event || !event->posted)
return;
QThreadData *data = QThreadData::current();
QMutexLocker locker(&data->postEventList.mutex);
if (data->postEventList.size() == 0) {
#if defined(QT_DEBUG)
qDebug("QCoreApplication::removePostedEvent: Internal error: %p %d is posted",
(void*)event, event->type());
return;
#endif
}
for (int i = 0; i < data->postEventList.size(); ++i) {
const QPostEvent & pe = data->postEventList.at(i);
if (pe.event == event) {
#ifndef QT_NO_DEBUG
qWarning("QCoreApplication::removePostedEvent: Event of type %d deleted while posted to %s %s",
event->type(),
pe.receiver->metaObject()->className(),
pe.receiver->objectName().toLocal8Bit().data());
#endif
--pe.receiver->d_func()->postedEvents;
pe.event->posted = false;
delete pe.event;
const_cast<QPostEvent &>(pe).event = 0;
return;
}
}
}
/*!\reimp
*/
bool QCoreApplication::event(QEvent *e)
{
if (e->type() == QEvent::Quit) {
quit();
return true;
}
return QObject::event(e);
}
/*! \enum QCoreApplication::Encoding
This enum type defines the 8-bit encoding of character string
arguments to translate():
\value CodecForTr The encoding specified by
QTextCodec::codecForTr() (Latin-1 if none has
been set).
\value UnicodeUTF8 UTF-8.
\value DefaultCodec (Obsolete) Use CodecForTr instead.
\sa QObject::tr(), QObject::trUtf8(), QString::fromUtf8()
*/
/*!
Tells the application to exit with return code 0 (success).
Equivalent to calling QCoreApplication::exit(0).
It's common to connect the QApplication::lastWindowClosed() signal
to quit(), and you also often connect e.g. QAbstractButton::clicked() or
signals in QAction, QMenu, or QMenuBar to it.
Example:
\snippet doc/src/snippets/code/src_corelib_kernel_qcoreapplication.cpp 1
\sa exit(), aboutToQuit(), QApplication::lastWindowClosed()
*/
void QCoreApplication::quit()
{
exit(0);
}
/*!
\fn void QCoreApplication::aboutToQuit()
This signal is emitted when the application is about to quit the
main event loop, e.g. when the event loop level drops to zero.
This may happen either after a call to quit() from inside the
application or when the users shuts down the entire desktop session.
The signal is particularly useful if your application has to do some
last-second cleanup. Note that no user interaction is possible in
this state.
\sa quit()
*/
#ifndef QT_NO_TRANSLATION
/*!
Adds the translation file \a translationFile to the list of
translation files to be used for translations.
Multiple translation files can be installed. Translations are
searched for in the reverse order in which they were installed,
so the most recently installed translation file is searched first
and the first translation file installed is searched last.
The search stops as soon as a translation containing a matching
string is found.
Installing or removing a QTranslator, or changing an installed QTranslator
generates a \l{QEvent::LanguageChange}{LanguageChange} event for the
QCoreApplication instance. A QApplication instance will propagate the event
to all toplevel windows, where a reimplementation of changeEvent can
re-translate the user interface by passing user-visible strings via the
tr() function to the respective property setters. User-interface classes
generated by \l{Qt Designer} provide a \c retranslateUi() function that can be
called.
\sa removeTranslator() translate() QTranslator::load() {Dynamic Translation}
*/
void QCoreApplication::installTranslator(QTranslator *translationFile)
{
if (!translationFile)
return;
if (!QCoreApplicationPrivate::checkInstance("installTranslator"))
return;
QCoreApplicationPrivate *d = self->d_func();
d->translators.prepend(translationFile);
#ifndef QT_NO_TRANSLATION_BUILDER
if (translationFile->isEmpty())
return;
#endif
QEvent ev(QEvent::LanguageChange);
QCoreApplication::sendEvent(self, &ev);
}
/*!
Removes the translation file \a translationFile from the list of
translation files used by this application. (It does not delete the
translation file from the file system.)
\sa installTranslator() translate(), QObject::tr()
*/
void QCoreApplication::removeTranslator(QTranslator *translationFile)
{
if (!translationFile)
return;
if (!QCoreApplicationPrivate::checkInstance("removeTranslator"))
return;
QCoreApplicationPrivate *d = self->d_func();
if (d->translators.removeAll(translationFile) && !self->closingDown()) {
QEvent ev(QEvent::LanguageChange);
QCoreApplication::sendEvent(self, &ev);
}
}
/*!
\overload translate()
*/
QString QCoreApplication::translate(const char *context, const char *sourceText,
const char *disambiguation, Encoding encoding)
{
return translate(context, sourceText, disambiguation, encoding, -1);
}
static void replacePercentN(QString *result, int n)
{
if (n >= 0) {
int percentPos = 0;
int len = 0;
while ((percentPos = result->indexOf(QLatin1Char('%'), percentPos + len)) != -1) {
len = 1;
QString fmt;
if (result->at(percentPos + len) == QLatin1Char('L')) {
++len;
fmt = QLatin1String("%L1");
} else {
fmt = QLatin1String("%1");
}
if (result->at(percentPos + len) == QLatin1Char('n')) {
fmt = fmt.arg(n);
++len;
result->replace(percentPos, len, fmt);
len = fmt.length();
}
}
}
}
/*!
\reentrant
\since 4.5
Returns the translation text for \a sourceText, by querying the
installed translation files. The translation files are searched
from the most recently installed file back to the first
installed file.
QObject::tr() and QObject::trUtf8() provide this functionality
more conveniently.
\a context is typically a class name (e.g., "MyDialog") and \a
sourceText is either English text or a short identifying text.
\a disambiguation is an identifying string, for when the same \a
sourceText is used in different roles within the same context. By
default, it is null.
See the \l QTranslator and \l QObject::tr() documentation for
more information about contexts, disambiguations and comments.
\a encoding indicates the 8-bit encoding of character strings.
\a n is used in conjunction with \c %n to support plural forms.
See QObject::tr() for details.
If none of the translation files contain a translation for \a
sourceText in \a context, this function returns a QString
equivalent of \a sourceText. The encoding of \a sourceText is
specified by \e encoding; it defaults to CodecForTr.
This function is not virtual. You can use alternative translation
techniques by subclassing \l QTranslator.
\warning This method is reentrant only if all translators are
installed \e before calling this method. Installing or removing
translators while performing translations is not supported. Doing
so will most likely result in crashes or other undesirable
behavior.
\sa QObject::tr() installTranslator() QTextCodec::codecForTr()
*/
QString QCoreApplication::translate(const char *context, const char *sourceText,
const char *disambiguation, Encoding encoding, int n)
{
QString result;
if (!sourceText)
return result;
if (self && !self->d_func()->translators.isEmpty()) {
QList<QTranslator*>::ConstIterator it;
QTranslator *translationFile;
for (it = self->d_func()->translators.constBegin(); it != self->d_func()->translators.constEnd(); ++it) {
translationFile = *it;
result = translationFile->translate(context, sourceText, disambiguation, n);
if (!result.isEmpty())
break;
}
}
if (result.isEmpty()) {
#ifdef QT_NO_TEXTCODEC
Q_UNUSED(encoding)
#else
if (encoding == UnicodeUTF8)
result = QString::fromUtf8(sourceText);
else if (QTextCodec::codecForTr() != 0)
result = QTextCodec::codecForTr()->toUnicode(sourceText);
else
#endif
result = QString::fromLatin1(sourceText);
}
replacePercentN(&result, n);
return result;
}
// Declared in qglobal.h
QString qtTrId(const char *id, int n)
{
return QCoreApplication::translate(0, id, 0, QCoreApplication::UnicodeUTF8, n);
}
bool QCoreApplicationPrivate::isTranslatorInstalled(QTranslator *translator)
{
return QCoreApplication::self
&& QCoreApplication::self->d_func()->translators.contains(translator);
}
#endif //QT_NO_TRANSLATE
/*!
Returns the directory that contains the application executable.
For example, if you have installed Qt in the \c{C:\Trolltech\Qt}
directory, and you run the \c{regexp} example, this function will
return "C:/Trolltech/Qt/examples/tools/regexp".
On Mac OS X this will point to the directory actually containing the
executable, which may be inside of an application bundle (if the
application is bundled).
\warning On Linux, this function will try to get the path from the
\c {/proc} file system. If that fails, it assumes that \c
{argv[0]} contains the absolute file name of the executable. The
function also assumes that the current directory has not been
changed by the application.
In Symbian this function will return the application private directory,
not the path to executable itself, as those are always in \c {/sys/bin}.
If the application is in a read only drive, i.e. ROM, then the private path
on the system drive will be returned.
\sa applicationFilePath()
*/
QString QCoreApplication::applicationDirPath()
{
if (!self) {
qWarning("QCoreApplication::applicationDirPath: Please instantiate the QApplication object first");
return QString();
}
QCoreApplicationPrivate *d = self->d_func();
if (d->cachedApplicationDirPath.isNull())
#if defined(Q_OS_SYMBIAN)
{
QString appPath;
RFs& fs = qt_s60GetRFs();
TChar driveChar;
QChar qDriveChar;
driveChar = (RProcess().FileName())[0];
//Check if the process is installed in a read only drive (typically ROM),
//and use the system drive (typically C:) if so.
TInt drive;
TDriveInfo driveInfo;
TInt err = fs.CharToDrive(driveChar, drive);
if (err == KErrNone) {
err = fs.Drive(driveInfo, drive);
}
if (err != KErrNone || (driveInfo.iDriveAtt & KDriveAttRom) || (driveInfo.iMediaAtt
& KMediaAttWriteProtected)) {
if(!PtrGetSystemDrive)
PtrGetSystemDrive = reinterpret_cast<SystemDriveFunc>(qt_resolveS60PluginFunc(S60Plugin_GetSystemDrive));
Q_ASSERT(PtrGetSystemDrive);
drive = PtrGetSystemDrive(fs);
fs.DriveToChar(drive, driveChar);
}
qDriveChar = QChar(QLatin1Char(driveChar)).toUpper();
TFileName privatePath;
fs.PrivatePath(privatePath);
appPath = qt_TDesC2QString(privatePath);
appPath.prepend(QLatin1Char(':')).prepend(qDriveChar);
// Create the appPath if it doesn't exist. Non-existing appPath will cause
// Platform Security violations later on if the app doesn't have AllFiles capability.
err = fs.CreatePrivatePath(drive);
if (err != KErrNone)
qWarning("QCoreApplication::applicationDirPath: Failed to create private path.");
d->cachedApplicationDirPath = QFileInfo(appPath).path();
}
#else
d->cachedApplicationDirPath = QFileInfo(applicationFilePath()).path();
#endif
return d->cachedApplicationDirPath;
}
/*!
Returns the file path of the application executable.
For example, if you have installed Qt in the \c{/usr/local/qt}
directory, and you run the \c{regexp} example, this function will
return "/usr/local/qt/examples/tools/regexp/regexp".
\warning On Linux, this function will try to get the path from the
\c {/proc} file system. If that fails, it assumes that \c
{argv[0]} contains the absolute file name of the executable. The
function also assumes that the current directory has not been
changed by the application.
\sa applicationDirPath()
*/
QString QCoreApplication::applicationFilePath()
{
if (!self) {
qWarning("QCoreApplication::applicationFilePath: Please instantiate the QApplication object first");
return QString();
}
QCoreApplicationPrivate *d = self->d_func();
if (!d->cachedApplicationFilePath.isNull())
return d->cachedApplicationFilePath;
#if defined(Q_WS_WIN)
d->cachedApplicationFilePath = QFileInfo(qAppFileName()).filePath();
return d->cachedApplicationFilePath;
#elif defined(Q_WS_MAC)
QString qAppFileName_str = qAppFileName();
if(!qAppFileName_str.isEmpty()) {
QFileInfo fi(qAppFileName_str);
d->cachedApplicationFilePath = fi.exists() ? fi.canonicalFilePath() : QString();
return d->cachedApplicationFilePath;
}
#endif
#if defined(Q_OS_SYMBIAN)
QString appPath;
RProcess proc;
TInt err = proc.Open(proc.Id());
if (err == KErrNone) {
TFileName procName = proc.FileName();
appPath.append(QString(reinterpret_cast<const QChar*>(procName.Ptr()), procName.Length()));
proc.Close();
}
d->cachedApplicationFilePath = appPath;
return d->cachedApplicationFilePath;
#elif defined( Q_OS_UNIX )
# ifdef Q_OS_LINUX
// Try looking for a /proc/<pid>/exe symlink first which points to
// the absolute path of the executable
QFileInfo pfi(QString::fromLatin1("/proc/%1/exe").arg(getpid()));
if (pfi.exists() && pfi.isSymLink()) {
d->cachedApplicationFilePath = pfi.canonicalFilePath();
return d->cachedApplicationFilePath;
}
# endif
QString argv0 = QFile::decodeName(QByteArray(argv()[0]));
QString absPath;
if (!argv0.isEmpty() && argv0.at(0) == QLatin1Char('/')) {
/*
If argv0 starts with a slash, it is already an absolute
file path.
*/
absPath = argv0;
} else if (argv0.contains(QLatin1Char('/'))) {
/*
If argv0 contains one or more slashes, it is a file path
relative to the current directory.
*/
absPath = QDir::current().absoluteFilePath(argv0);
} else {
/*
Otherwise, the file path has to be determined using the
PATH environment variable.
*/
QByteArray pEnv = qgetenv("PATH");
QDir currentDir = QDir::current();
QStringList paths = QString::fromLocal8Bit(pEnv.constData()).split(QLatin1Char(':'));
for (QStringList::const_iterator p = paths.constBegin(); p != paths.constEnd(); ++p) {
if ((*p).isEmpty())
continue;
QString candidate = currentDir.absoluteFilePath(*p + QLatin1Char('/') + argv0);
QFileInfo candidate_fi(candidate);
if (candidate_fi.exists() && !candidate_fi.isDir()) {
absPath = candidate;
break;
}
}
}
absPath = QDir::cleanPath(absPath);
QFileInfo fi(absPath);
d->cachedApplicationFilePath = fi.exists() ? fi.canonicalFilePath() : QString();
return d->cachedApplicationFilePath;
#endif
}
/*!
\since 4.4
Returns the current process ID for the application.
*/
qint64 QCoreApplication::applicationPid()
{
#if defined(Q_OS_WIN32) || defined(Q_OS_WINCE)
return GetCurrentProcessId();
#elif defined(Q_OS_VXWORKS)
return (pid_t) taskIdCurrent;
#else
return getpid();
#endif
}
/*!
\obsolete
Use arguments().size() instead.
*/
int QCoreApplication::argc()
{
if (!self) {
qWarning("QCoreApplication::argc: Please instantiate the QApplication object first");
return 0;
}
return self->d_func()->argc;
}
/*!
\obsolete
Use arguments() instead.
*/
char **QCoreApplication::argv()
{
if (!self) {
qWarning("QCoreApplication::argv: Please instantiate the QApplication object first");
return 0;
}
return self->d_func()->argv;
}
/*!
\since 4.1
Returns the list of command-line arguments.
Usually arguments().at(0) is the program name, arguments().at(1)
is the first argument, and arguments().last() is the last
argument. See the note below about Windows.
Calling this function is slow - you should store the result in a variable
when parsing the command line.
\warning On Unix, this list is built from the argc and argv parameters passed
to the constructor in the main() function. The string-data in argv is
interpreted using QString::fromLocal8Bit(); hence it is not possible to
pass, for example, Japanese command line arguments on a system that runs in a
Latin1 locale. Most modern Unix systems do not have this limitation, as they are
Unicode-based.
On NT-based Windows, this limitation does not apply either.
On Windows, the arguments() are not built from the contents of argv/argc, as
the content does not support Unicode. Instead, the arguments() are constructed
from the return value of
\l{http://msdn2.microsoft.com/en-us/library/ms683156(VS.85).aspx}{GetCommandLine()}.
As a result of this, the string given by arguments().at(0) might not be
the program name on Windows, depending on how the application was started.
\sa applicationFilePath()
*/
QStringList QCoreApplication::arguments()
{
QStringList list;
if (!self) {
qWarning("QCoreApplication::arguments: Please instantiate the QApplication object first");
return list;
}
#ifdef Q_OS_WIN
QString cmdline = QString::fromWCharArray(GetCommandLine());
#if defined(Q_OS_WINCE)
wchar_t tempFilename[MAX_PATH+1];
if (GetModuleFileName(0, tempFilename, MAX_PATH)) {
tempFilename[MAX_PATH] = 0;
cmdline.prepend(QLatin1Char('\"') + QString::fromWCharArray(tempFilename) + QLatin1String("\" "));
}
#endif // Q_OS_WINCE
list = qWinCmdArgs(cmdline);
if (self->d_func()->application_type) { // GUI app? Skip known - see qapplication.cpp
QStringList stripped;
for (int a = 0; a < list.count(); ++a) {
QString arg = list.at(a);
QByteArray l1arg = arg.toLatin1();
if (l1arg == "-qdevel" ||
l1arg == "-qdebug" ||
l1arg == "-reverse" ||
l1arg == "-stylesheet" ||
l1arg == "-widgetcount")
;
else if (l1arg.startsWith("-style="))
;
else if (l1arg == "-style" ||
l1arg == "-session" ||
l1arg == "-graphicssystem" ||
l1arg == "-testability")
++a;
else
stripped += arg;
}
list = stripped;
}
#else
const int ac = self->d_func()->argc;
char ** const av = self->d_func()->argv;
for (int a = 0; a < ac; ++a) {
list << QString::fromLocal8Bit(av[a]);
}
#endif
return list;
}
/*!
\property QCoreApplication::organizationName
\brief the name of the organization that wrote this application
The value is used by the QSettings class when it is constructed
using the empty constructor. This saves having to repeat this
information each time a QSettings object is created.
On Mac, QSettings uses organizationDomain() as the organization
if it's not an empty string; otherwise it uses
organizationName(). On all other platforms, QSettings uses
organizationName() as the organization.
\sa organizationDomain applicationName
*/
void QCoreApplication::setOrganizationName(const QString &orgName)
{
coreappdata()->orgName = orgName;
}
QString QCoreApplication::organizationName()
{
return coreappdata()->orgName;
}
/*!
\property QCoreApplication::organizationDomain
\brief the Internet domain of the organization that wrote this application
The value is used by the QSettings class when it is constructed
using the empty constructor. This saves having to repeat this
information each time a QSettings object is created.
On Mac, QSettings uses organizationDomain() as the organization
if it's not an empty string; otherwise it uses organizationName().
On all other platforms, QSettings uses organizationName() as the
organization.
\sa organizationName applicationName applicationVersion
*/
void QCoreApplication::setOrganizationDomain(const QString &orgDomain)
{
coreappdata()->orgDomain = orgDomain;
}
QString QCoreApplication::organizationDomain()
{
return coreappdata()->orgDomain;
}
/*!
\property QCoreApplication::applicationName
\brief the name of this application
The value is used by the QSettings class when it is constructed
using the empty constructor. This saves having to repeat this
information each time a QSettings object is created.
\sa organizationName organizationDomain applicationVersion
*/
void QCoreApplication::setApplicationName(const QString &application)
{
coreappdata()->application = application;
}
QString QCoreApplication::applicationName()
{
return coreappdata()->application;
}
/*!
\property QCoreApplication::applicationVersion
\since 4.4
\brief the version of this application
\sa applicationName organizationName organizationDomain
*/
void QCoreApplication::setApplicationVersion(const QString &version)
{
coreappdata()->applicationVersion = version;
}
QString QCoreApplication::applicationVersion()
{
return coreappdata()->applicationVersion;
}
#if !defined(QT_NO_LIBRARY) && !defined(QT_NO_SETTINGS)
Q_GLOBAL_STATIC_WITH_ARGS(QMutex, libraryPathMutex, (QMutex::Recursive))
/*!
Returns a list of paths that the application will search when
dynamically loading libraries.
Qt provides default library paths, but they can also be set using
a \l{Using qt.conf}{qt.conf} file. Paths specified in this file
will override default values.
This list will include the installation directory for plugins if
it exists (the default installation directory for plugins is \c
INSTALL/plugins, where \c INSTALL is the directory where Qt was
installed). The directory of the application executable (NOT the
working directory) is always added, as well as the colon separated
entries of the QT_PLUGIN_PATH environment variable.
If you want to iterate over the list, you can use the \l foreach
pseudo-keyword:
\snippet doc/src/snippets/code/src_corelib_kernel_qcoreapplication.cpp 2
\sa setLibraryPaths(), addLibraryPath(), removeLibraryPath(), QLibrary,
{How to Create Qt Plugins}
*/
QStringList QCoreApplication::libraryPaths()
{
QMutexLocker locker(libraryPathMutex());
if (!coreappdata()->app_libpaths) {
QStringList *app_libpaths = coreappdata()->app_libpaths = new QStringList;
QString installPathPlugins = QLibraryInfo::location(QLibraryInfo::PluginsPath);
#if defined(Q_OS_SYMBIAN)
// Add existing path on all drives for relative PluginsPath in Symbian
if (installPathPlugins.at(1) != QChar(QLatin1Char(':'))) {
QString tempPath = installPathPlugins;
if (tempPath.at(tempPath.length() - 1) != QDir::separator()) {
tempPath += QDir::separator();
}
RFs& fs = qt_s60GetRFs();
TPtrC tempPathPtr(reinterpret_cast<const TText*> (tempPath.constData()));
TFindFile finder(fs);
TInt err = finder.FindByDir(tempPathPtr, tempPathPtr);
while (err == KErrNone) {
QString foundDir(reinterpret_cast<const QChar *>(finder.File().Ptr()),
finder.File().Length());
foundDir = QDir(foundDir).canonicalPath();
if (!app_libpaths->contains(foundDir))
app_libpaths->append(foundDir);
err = finder.Find();
}
}
#else
if (QFile::exists(installPathPlugins)) {
// Make sure we convert from backslashes to slashes.
installPathPlugins = QDir(installPathPlugins).canonicalPath();
if (!app_libpaths->contains(installPathPlugins))
app_libpaths->append(installPathPlugins);
}
#endif
// If QCoreApplication is not yet instantiated,
// make sure we add the application path when we construct the QCoreApplication
if (self) self->d_func()->appendApplicationPathToLibraryPaths();
const QByteArray libPathEnv = qgetenv("QT_PLUGIN_PATH");
if (!libPathEnv.isEmpty()) {
#if defined(Q_OS_WIN) || defined(Q_OS_SYMBIAN)
QLatin1Char pathSep(';');
#else
QLatin1Char pathSep(':');
#endif
QStringList paths = QString::fromLatin1(libPathEnv).split(pathSep, QString::SkipEmptyParts);
for (QStringList::const_iterator it = paths.constBegin(); it != paths.constEnd(); ++it) {
QString canonicalPath = QDir(*it).canonicalPath();
if (!canonicalPath.isEmpty()
&& !app_libpaths->contains(canonicalPath)) {
app_libpaths->append(canonicalPath);
}
}
}
}
return *(coreappdata()->app_libpaths);
}
/*!
Sets the list of directories to search when loading libraries to
\a paths. All existing paths will be deleted and the path list
will consist of the paths given in \a paths.
In Symbian this function is only useful for setting paths for
finding Qt extension plugin stubs, since the OS can only
load libraries from the \c{/sys/bin} directory.
\sa libraryPaths(), addLibraryPath(), removeLibraryPath(), QLibrary
*/
void QCoreApplication::setLibraryPaths(const QStringList &paths)
{
#if !defined(QT_NO_LIBRARY) && !defined(QT_NO_SETTINGS)
QMutexLocker locker(libraryPathMutex());
if (!coreappdata()->app_libpaths)
coreappdata()->app_libpaths = new QStringList;
*(coreappdata()->app_libpaths) = paths;
QFactoryLoader::refreshAll();
#endif
}
/*!
Prepends \a path to the beginning of the library path list, ensuring that
it is searched for libraries first. If \a path is empty or already in the
path list, the path list is not changed.
The default path list consists of a single entry, the installation
directory for plugins. The default installation directory for plugins
is \c INSTALL/plugins, where \c INSTALL is the directory where Qt was
installed.
In Symbian this function is only useful for adding paths for
finding Qt extension plugin stubs, since the OS can only
load libraries from the \c{/sys/bin} directory.
\sa removeLibraryPath(), libraryPaths(), setLibraryPaths()
*/
void QCoreApplication::addLibraryPath(const QString &path)
{
#if !defined(QT_NO_LIBRARY) && !defined(QT_NO_SETTINGS)
if (path.isEmpty())
return;
QMutexLocker locker(libraryPathMutex());
// make sure that library paths is initialized
libraryPaths();
QString canonicalPath = QDir(path).canonicalPath();
if (!canonicalPath.isEmpty()
&& !coreappdata()->app_libpaths->contains(canonicalPath)) {
coreappdata()->app_libpaths->prepend(canonicalPath);
QFactoryLoader::refreshAll();
}
#endif
}
/*!
Removes \a path from the library path list. If \a path is empty or not
in the path list, the list is not changed.
\sa addLibraryPath(), libraryPaths(), setLibraryPaths()
*/
void QCoreApplication::removeLibraryPath(const QString &path)
{
#if !defined(QT_NO_LIBRARY) && !defined(QT_NO_SETTINGS)
if (path.isEmpty())
return;
QMutexLocker locker(libraryPathMutex());
// make sure that library paths is initialized
libraryPaths();
QString canonicalPath = QDir(path).canonicalPath();
coreappdata()->app_libpaths->removeAll(canonicalPath);
QFactoryLoader::refreshAll();
#endif
}
#endif //QT_NO_LIBRARY
/*!
\typedef QCoreApplication::EventFilter
A function with the following signature that can be used as an
event filter:
\snippet doc/src/snippets/code/src_corelib_kernel_qcoreapplication.cpp 3
\sa setEventFilter()
*/
/*!
\fn EventFilter QCoreApplication::setEventFilter(EventFilter filter)
Replaces the event filter function for the QCoreApplication with
\a filter and returns the pointer to the replaced event filter
function. Only the current event filter function is called. If you
want to use both filter functions, save the replaced EventFilter
in a place where yours can call it.
The event filter function set here is called for all messages
received by all threads meant for all Qt objects. It is \e not
called for messages that are not meant for Qt objects.
The event filter function should return true if the message should
be filtered, (i.e. stopped). It should return false to allow
processing the message to continue.
By default, no event filter function is set (i.e., this function
returns a null EventFilter the first time it is called).
\note The filter function set here receives native messages,
i.e. MSG or XEvent structs, that are going to Qt objects. It is
called by QCoreApplication::filterEvent(). If the filter function
returns false to indicate the message should be processed further,
the native message can then be translated into a QEvent and
handled by the standard Qt \l{QEvent} {event} filering, e.g.
QObject::installEventFilter().
\note The filter function set here is different form the filter
function set via QAbstractEventDispatcher::setEventFilter(), which
gets all messages received by its thread, even messages meant for
objects that are not handled by Qt.
\sa QObject::installEventFilter(), QAbstractEventDispatcher::setEventFilter()
*/
QCoreApplication::EventFilter
QCoreApplication::setEventFilter(QCoreApplication::EventFilter filter)
{
Q_D(QCoreApplication);
EventFilter old = d->eventFilter;
d->eventFilter = filter;
return old;
}
/*!
Sends \a message through the event filter that was set by
setEventFilter(). If no event filter has been set, this function
returns false; otherwise, this function returns the result of the
event filter function in the \a result parameter.
\sa setEventFilter()
*/
bool QCoreApplication::filterEvent(void *message, long *result)
{
Q_D(QCoreApplication);
if (result)
*result = 0;
if (d->eventFilter)
return d->eventFilter(message, result);
#ifdef Q_OS_WIN
return winEventFilter(reinterpret_cast<MSG *>(message), result);
#else
return false;
#endif
}
/*!
This function returns true if there are pending events; otherwise
returns false. Pending events can be either from the window
system or posted events using postEvent().
\sa QAbstractEventDispatcher::hasPendingEvents()
*/
bool QCoreApplication::hasPendingEvents()
{
QAbstractEventDispatcher *eventDispatcher = QAbstractEventDispatcher::instance();
if (eventDispatcher)
return eventDispatcher->hasPendingEvents();
return false;
}
#ifdef QT3_SUPPORT
/*! \fn void QCoreApplication::lock()
In Qt 3, this function locked the Qt library mutex, allowing
non-GUI threads to perform basic printing operations using
QPainter.
In Qt 4, this is no longer supported, since painting is only
supported from within a paint event handler. This function does
nothing.
\sa QWidget::paintEvent()
*/
/*! \fn void QCoreApplication::unlock(bool wakeUpGui)
In Qt 3, this function unlocked the Qt library mutex. The mutex
allowed non-GUI threads to perform basic printing operations
using QPainter.
In Qt 4, this is no longer supported, since painting is only
supported from within a paint event handler. This function does
nothing.
*/
/*! \fn bool QCoreApplication::locked()
This function does nothing. It is there to keep old code working.
It always returns false.
See lock() for details.
*/
/*! \fn bool QCoreApplication::tryLock()
This function does nothing. It is there to keep old code working.
It always returns false.
See lock() for details.
*/
/*! \fn void QCoreApplication::processOneEvent()
\obsolete
Waits for an event to occur, processes it, then returns.
This function is useful for adapting Qt to situations where the
event processing must be grafted onto existing program loops.
Using this function in new applications may be an indication of design
problems.
\sa processEvents(), exec(), QTimer
*/
/*! \obsolete
This function enters the main event loop (recursively). Do not call
it unless you really know what you are doing.
*/
int QCoreApplication::enter_loop()
{
if (!QCoreApplicationPrivate::checkInstance("enter_loop"))
return -1;
if (QThreadData::current() != self->d_func()->threadData) {
qWarning("QCoreApplication::enter_loop: Must be called from the main thread");
return -1;
}
QEventLoop eventLoop;
int returnCode = eventLoop.exec();
return returnCode;
}
/*! \obsolete
This function exits from a recursive call to the main event loop.
Do not call it unless you are an expert.
*/
void QCoreApplication::exit_loop()
{
if (!QCoreApplicationPrivate::checkInstance("exit_loop"))
return;
QThreadData *data = QThreadData::current();
if (data != self->d_func()->threadData) {
qWarning("QCoreApplication::exit_loop: Must be called from the main thread");
return;
}
if (!data->eventLoops.isEmpty())
data->eventLoops.top()->exit();
}
/*! \obsolete
Returns the current loop level.
*/
int QCoreApplication::loopLevel()
{
if (!QCoreApplicationPrivate::checkInstance("loopLevel"))
return -1;
return self->d_func()->threadData->eventLoops.size();
}
#endif
/*
\fn void QCoreApplication::watchUnixSignal(int signal, bool watch)
\internal
*/
/*!
\fn void QCoreApplication::unixSignal(int number)
\internal
This signal is emitted whenever a Unix signal is received by the
application. The Unix signal received is specified by its \a number.
*/
/*!
\fn void qAddPostRoutine(QtCleanUpFunction ptr)
\relates QCoreApplication
Adds a global routine that will be called from the QApplication
destructor. This function is normally used to add cleanup routines
for program-wide functionality.
The function specified by \a ptr should take no arguments and should
return nothing. For example:
\snippet doc/src/snippets/code/src_corelib_kernel_qcoreapplication.cpp 4
Note that for an application- or module-wide cleanup,
qAddPostRoutine() is often not suitable. For example, if the
program is split into dynamically loaded modules, the relevant
module may be unloaded long before the QApplication destructor is
called.
For modules and libraries, using a reference-counted
initialization manager or Qt's parent-child deletion mechanism may
be better. Here is an example of a private class that uses the
parent-child mechanism to call a cleanup function at the right
time:
\snippet doc/src/snippets/code/src_corelib_kernel_qcoreapplication.cpp 5
By selecting the right parent object, this can often be made to
clean up the module's data at the right moment.
*/
/*!
\macro Q_DECLARE_TR_FUNCTIONS(context)
\relates QCoreApplication
The Q_DECLARE_TR_FUNCTIONS() macro declares and implements two
translation functions, \c tr() and \c trUtf8(), with these
signatures:
\snippet doc/src/snippets/code/src_corelib_kernel_qcoreapplication.cpp 6
This macro is useful if you want to use QObject::tr() or
QObject::trUtf8() in classes that don't inherit from QObject.
Q_DECLARE_TR_FUNCTIONS() must appear at the very top of the
class definition (before the first \c{public:} or \c{protected:}).
For example:
\snippet doc/src/snippets/code/src_corelib_kernel_qcoreapplication.cpp 7
The \a context parameter is normally the class name, but it can
be any string.
\sa Q_OBJECT, QObject::tr(), QObject::trUtf8()
*/
QT_END_NAMESPACE