com.trolltech.qt.core
Class QCoreApplication

java.lang.Object
  extended by com.trolltech.qt.internal.QSignalEmitterInternal
      extended by com.trolltech.qt.QSignalEmitter
          extended by com.trolltech.qt.QtJambiObject
              extended by com.trolltech.qt.core.QObject
                  extended by com.trolltech.qt.core.QCoreApplication
All Implemented Interfaces:
QtJambiInterface
Direct Known Subclasses:
QApplication

public class QCoreApplication
extends QObject

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.

The command line arguments which QCoreApplication's constructor should be called with are accessible using arguments(). 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 main() function as early as possible. The application will enter the event loop when exec() is called. exit() will not return until the event loop exits, e.g., when quit() is called.

An application has an applicationDirPath() and an applicationFilePath(). 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().

The class provides a quit() slot and an aboutToQuit() signal.

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(). Library paths (see QLibrary) can be retrieved with libraryPaths() and manipulated by setLibraryPaths(), addLibraryPath(), and removeLibraryPath().

See also:
QApplication, QAbstractEventDispatcher, QEventLoop, Semaphores Example, and Wait Conditions Example.


Nested Class Summary
static class QCoreApplication.Encoding
          This enum type defines the 8-bit encoding of character string arguments to translate():
 
Nested classes/interfaces inherited from class com.trolltech.qt.QSignalEmitter
QSignalEmitter.AbstractSignal, QSignalEmitter.PrivateSignal0, QSignalEmitter.PrivateSignal1, QSignalEmitter.PrivateSignal2, QSignalEmitter.PrivateSignal3, QSignalEmitter.PrivateSignal4, QSignalEmitter.PrivateSignal5, QSignalEmitter.PrivateSignal6, QSignalEmitter.PrivateSignal7, QSignalEmitter.PrivateSignal8, QSignalEmitter.PrivateSignal9, QSignalEmitter.Signal0, QSignalEmitter.Signal1, QSignalEmitter.Signal2, QSignalEmitter.Signal3, QSignalEmitter.Signal4, QSignalEmitter.Signal5, QSignalEmitter.Signal6, QSignalEmitter.Signal7, QSignalEmitter.Signal8, QSignalEmitter.Signal9
 
Nested classes/interfaces inherited from class com.trolltech.qt.internal.QSignalEmitterInternal
com.trolltech.qt.internal.QSignalEmitterInternal.AbstractSignalInternal
 
Field Summary
 QSignalEmitter.Signal0 aboutToQuit
          This signal is emitted when the application is about to quit the main event loop, e.
protected static QCoreApplication m_instance
           
 QSignalEmitter.Signal1 unixSignal
          This signal takes 1 generic argument(s).
 
Fields inherited from class com.trolltech.qt.internal.QSignalEmitterInternal
currentSender
 
Constructor Summary
QCoreApplication(java.lang.String[] args)
          Constructs a Qt kernel application.
 
Method Summary
static void addLibraryPath(java.lang.String arg__1)
          Prepends path to the beginning of the library path list, ensuring that it is searched for libraries first.
static java.lang.String applicationDirPath()
          Returns the directory that contains the application executable.
static java.lang.String applicationFilePath()
          Returns the file path of the application executable.
static java.lang.String applicationName()
          This property holds the name of this application.
static long applicationPid()
          Returns the current process ID for the application.
static java.lang.String applicationVersion()
          This property holds the version of this application.
static java.util.List arguments()
          Returns the list of command-line arguments.
static boolean closingDown()
          Returns true if the application objects are being destroyed; otherwise returns false.
static int exec()
          Enters the main event loop and waits until exit() is called.
static void exit()
          Tells the application to exit with a return code.
static void exit(int retcode)
          Tells the application to exit with a return code.
static void flush()
          Flushes the platform specific event queues.
static boolean hasPendingEvents()
          This function returns true if there are pending events; otherwise returns false.
static void initialize(java.lang.String[] args)
          QCoreApplication keeps a unique instance of a QCoreApplication.
static void installTranslator(QTranslator messageFile)
          Adds the translation file translationFile to the list of translation files to be used for translations.
static QCoreApplication instance()
          Returns a pointer to the application's QCoreApplication (or QApplication) instance.
static void invokeAndWait(java.lang.Runnable runnable)
          Executes the runnable's run() method in the main thread and waits for it to return.
static void invokeLater(int timeout, java.lang.Runnable task)
          Executes the task in the application's main thread after the specified timeout.
static void invokeLater(java.lang.Runnable runnable)
          This function will queue the runnable and invokes it later.
static java.util.List libraryPaths()
          Returns a list of paths that the application will search when dynamically loading libraries.
 boolean notify(QObject arg__1, QEvent arg__2)
          Sends event to receiver.
static java.lang.String organizationDomain()
          This property holds the Internet domain of the organization that wrote this application.
static java.lang.String organizationName()
          This property holds the name of the organization that wrote this application.
static void postEvent(QObject receiver, QEvent event)
          Adds the event event, with the object receiver as the receiver of the event, to an event queue and returns immediately.
static void postEvent(QObject receiver, QEvent event, int priority)
          This function overloads postEvent().
static void processEvents()
          Processes all pending events for the calling thread according to the specified flags until there are no more events to process.
static void processEvents(QEventLoop.ProcessEventsFlag[] flags)
           
static void processEvents(QEventLoop.ProcessEventsFlags flags)
          Processes all pending events for the calling thread according to the specified flags until there are no more events to process.
static void processEvents(QEventLoop.ProcessEventsFlags flags, int maxtime)
          This function overloads processEvents().
static void quit()
          Tells the application to exit with return code 0 (success).
static void removeLibraryPath(java.lang.String arg__1)
          Removes path from the library path list.
static void removePostedEvents(QObject receiver)
          Removes all events posted using postEvent() for receiver.
static void removePostedEvents(QObject receiver, int eventType)
          This function overloads removePostedEvents().
static void removeTranslator(QTranslator messageFile)
          Removes the translation file translationFile from the list of translation files used by this application.
static boolean sendEvent(QObject receiver, QEvent event)
          Sends event event directly to receiver receiver, using the notify() function.
static void sendPostedEvents()
          This function overloads sendPostedEvents().
static void sendPostedEvents(QObject receiver, int event_type)
          Immediately dispatches all events which have been previously queued with QCoreApplication::postEvent() and which are for the object receiver and have the event type event_type.
static void setApplicationName(java.lang.String application)
          This property holds the name of this application.
static void setApplicationVersion(java.lang.String version)
          This property holds the version of this application.
static void setAttribute(Qt.ApplicationAttribute attribute)
          Sets the attribute attribute if on is true; otherwise clears the attribute.
static void setAttribute(Qt.ApplicationAttribute attribute, boolean on)
          Sets the attribute attribute if on is true; otherwise clears the attribute.
static void setLibraryPaths(java.util.List arg__1)
          Sets the list of directories to search when loading libraries to paths.
static void setOrganizationDomain(java.lang.String orgDomain)
          This property holds the Internet domain of the organization that wrote this application.
static void setOrganizationName(java.lang.String orgName)
          This property holds the name of the organization that wrote this application.
static boolean startingUp()
          Returns true if an application object has not been created yet; otherwise returns false.
static boolean testAttribute(Qt.ApplicationAttribute attribute)
          Returns true if attribute attribute is set; otherwise returns false.
static java.lang.String translate(java.lang.String context, java.lang.String sourceText)
          This is an overloaded function provided for convenience.
static java.lang.String translate(java.lang.String context, java.lang.String sourceText, java.lang.String comment)
          Returns the translation text for sourceText, by querying the installed translation files.
static java.lang.String translate(java.lang.String context, java.lang.String sourceText, java.lang.String comment, int n)
          Returns the translation text for sourceText, by querying the installed translation files.
 
Methods inherited from class com.trolltech.qt.core.QObject
childEvent, children, connectSlotsByName, customEvent, disposeLater, dumpObjectInfo, dumpObjectTree, dynamicPropertyNames, event, eventFilter, findChild, findChild, findChild, findChildren, findChildren, findChildren, findChildren, indexOfProperty, installEventFilter, isWidgetType, killTimer, moveToThread, objectName, parent, properties, property, removeEventFilter, setObjectName, setParent, setProperty, startTimer, timerEvent, toString, userProperty
 
Methods inherited from class com.trolltech.qt.QtJambiObject
dispose, disposed, equals, finalize, reassignNativeResources, tr, tr, tr
 
Methods inherited from class com.trolltech.qt.QSignalEmitter
blockSignals, disconnect, disconnect, signalsBlocked, signalSender, thread
 
Methods inherited from class com.trolltech.qt.internal.QSignalEmitterInternal
__qt_signalInitialization
 
Methods inherited from class java.lang.Object
clone, getClass, hashCode, notify, notifyAll, wait, wait, wait
 
Methods inherited from interface com.trolltech.qt.QtJambiInterface
disableGarbageCollection, nativeId, nativePointer, reenableGarbageCollection, setJavaOwnership
 

Field Detail

aboutToQuit

public final QSignalEmitter.Signal0 aboutToQuit
This signal is emitted when the application is about to quit the main event loop, e. . 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.

See also:
quit().


unixSignal

public final QSignalEmitter.Signal1 unixSignal

This signal takes 1 generic argument(s). We list their type and the name they go by in the description of this signal. <java.lang.Integer(named: number)>:

This signal is emitted whenever a Unix signal is received by the application. The Unix signal received is specified by its number.


m_instance

protected static QCoreApplication m_instance
Constructor Detail

QCoreApplication

public QCoreApplication(java.lang.String[] args)
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 argument args arguments are processed by the application, and made available in a more convenient form by the arguments() function.

Method Detail

notify

public boolean notify(QObject arg__1,
                      QEvent arg__2)
Sends event to receiver. receiver->event(event). Returns the value that is returned from the receiver's event handler. Note that this function is called for all events send to any object is all threads.

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:

  1. Reimplementing paintEvent(), mousePressEvent() and so on. This is the commonest, easiest and least powerful way.
  2. Reimplementing this function. This is very powerful, providing complete control; but only one subclass can be active at a time.
  3. 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 disabled widgets. Note that application event filters are only called for objects that live in the main thread.
  4. 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.
  5. 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.

See also:
QObject::event(), and installEventFilter().


addLibraryPath

public static void addLibraryPath(java.lang.String arg__1)
Prepends path to the beginning of the library path list, ensuring that it is searched for libraries first. If 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 INSTALL/plugins, where INSTALL is the directory where Qt was installed.

See also:
removeLibraryPath(), libraryPaths(), and setLibraryPaths().


applicationDirPath

public static java.lang.String applicationDirPath()
Returns the directory that contains the application executable.

For example, if you have installed Qt in the C:\Trolltech\Qt directory, and you run the 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 /proc file system. If that fails, it assumes that 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.

See also:
applicationFilePath().


applicationFilePath

public static java.lang.String applicationFilePath()
Returns the file path of the application executable.

For example, if you have installed Qt in the /usr/local/qt directory, and you run the 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 /proc file system. If that fails, it assumes that 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.

See also:
applicationDirPath().


applicationName

public static java.lang.String applicationName()
This property holds 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.

See also:
organizationName, organizationDomain, and applicationVersion.


applicationPid

public static long applicationPid()
Returns the current process ID for the application.


applicationVersion

public static java.lang.String applicationVersion()
This property holds the version of this application.

See also:
applicationName, organizationName, and organizationDomain.


arguments

public static java.util.List arguments()
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 i.e. 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 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.

See also:
applicationFilePath().


closingDown

public static boolean closingDown()
Returns true if the application objects are being destroyed; otherwise returns false.

See also:
startingUp().


exec

public static int exec()
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 aboutToQuit() signal, instead of putting it in your application's 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 main() function after the QCoreApplication::exec() call.

See also:
quit(), exit(), processEvents(), and QApplication::exec().


exit

public static void exit()
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 returnCode. If the event loop is not running, this function does nothing.

By convention, 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 does return to the caller -- it is event processing that stops.

See also:
quit(), and exec().


exit

public static void exit(int retcode)
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 returnCode. If the event loop is not running, this function does nothing.

By convention, 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 does return to the caller -- it is event processing that stops.

See also:
quit(), and exec().


flush

public static void flush()
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.

See also:
sendPostedEvents().


hasPendingEvents

public static boolean hasPendingEvents()
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().

See also:
QAbstractEventDispatcher::hasPendingEvents().


installTranslator

public static void installTranslator(QTranslator messageFile)
Adds the translation file 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 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 Qt Designer provide a retranslateUi() function that can be called.

See also:
removeTranslator(), translate(), QTranslator::load(), and Dynamic Translation.


instance

public static QCoreApplication instance()
Returns a pointer to the application's QCoreApplication (or QApplication) instance.

If no instance has been allocated, null is returned.


libraryPaths

public static java.util.List libraryPaths()
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 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 INSTALL/plugins, where 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 foreach pseudo-keyword:

        for (String path : QApplication.libraryPaths())
            do_something(path);

See also:
setLibraryPaths(), addLibraryPath(), removeLibraryPath(), QLibrary, and How to Create Qt Plugins.


organizationDomain

public static java.lang.String organizationDomain()
This property holds 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.

See also:
organizationName, applicationName, and applicationVersion.


organizationName

public static java.lang.String organizationName()
This property holds 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.

See also:
organizationDomain, and applicationName.


postEvent

public static void postEvent(QObject receiver,
                             QEvent event)
Adds the event event, with the object 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 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 .

See also:
sendEvent(), notify(), and sendPostedEvents().


postEvent

public static void postEvent(QObject receiver,
                             QEvent event,
                             int priority)
This function overloads postEvent().

Adds the event event, with the object 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 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 priority order, i.e. events with a high priority are queued before events with a lower priority. The priority can be any integer value, i.e. between INT_MAX and INT_MIN, inclusive; see Qt::EventPriority for more details. Events with equal priority will be processed in the order posted.

See also:
sendEvent(), notify(), sendPostedEvents(), and Qt::EventPriority .


processEvents

public static void processEvents(QEventLoop.ProcessEventsFlag[] flags)

processEvents

public static void processEvents()
Processes all pending events for the calling thread according to the specified 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 DeferredDelete events will not be processed. This can affect the behaviour of widgets, e.g. QToolTip, that rely on DeferredDelete events to function properly. An alternative would be to call sendPostedEvents() from within that local loop.

Calling this function processes events only for the calling thread.

See also:
exec(), QTimer, QEventLoop::processEvents(), flush(), and sendPostedEvents().


processEvents

public static void processEvents(QEventLoop.ProcessEventsFlags flags)
Processes all pending events for the calling thread according to the specified 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 DeferredDelete events will not be processed. This can affect the behaviour of widgets, e.g. QToolTip, that rely on DeferredDelete events to function properly. An alternative would be to call sendPostedEvents() from within that local loop.

Calling this function processes events only for the calling thread.

See also:
exec(), QTimer, QEventLoop::processEvents(), flush(), and sendPostedEvents().


processEvents

public static void processEvents(QEventLoop.ProcessEventsFlags flags,
                                 int maxtime)
This function overloads processEvents().

Processes pending events for the calling thread for 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.

See also:
exec(), QTimer, and QEventLoop::processEvents().


quit

public static void quit()
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:

        QPushButton quitButton = new QPushButton("Quit");
        quitButton.clicked.connect(QApplication.instance(), "quit()");

See also:
exit(), aboutToQuit() , and QApplication::lastWindowClosed() .


removeLibraryPath

public static void removeLibraryPath(java.lang.String arg__1)
Removes path from the library path list. If path is empty or not in the path list, the list is not changed.

See also:
addLibraryPath(), libraryPaths(), and setLibraryPaths().


removePostedEvents

public static void removePostedEvents(QObject receiver)
Removes all events posted using postEvent() for receiver.

The events are 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 receiver to break one or more invariants.


removePostedEvents

public static void removePostedEvents(QObject receiver,
                                      int eventType)
This function overloads removePostedEvents().

Removes all events of the given eventType that were posted using postEvent() for receiver.

The events are 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 receiver to break one or more invariants.

If receiver is null, the events of eventType are removed for all objects. If eventType is 0, all the events are removed for receiver.


removeTranslator

public static void removeTranslator(QTranslator messageFile)
Removes the translation file translationFile from the list of translation files used by this application. (It does not delete the translation file from the file system.)

See also:
installTranslator(), translate(), and QObject::tr().


sendEvent

public static boolean sendEvent(QObject receiver,
                                QEvent event)
Sends event event directly to receiver receiver, using the notify() function. Returns the value that was returned from the event handler.

The event is not deleted when the event has been sent. The normal approach is to create the event on the stack, for example:

        QMouseEvent event = new QMouseEvent(QEvent.Type.MouseButtonPress, pos, Qt.MouseButton.NoButton,
                                            new Qt.MouseButtons(Qt.MouseButton.NoButton),
                                            new Qt.KeyboardModifiers(Qt.KeyboardModifier.NoModifier));
        QApplication.sendEvent(mainWindow, event);

See also:
postEvent(), and notify().


sendPostedEvents

public static void sendPostedEvents()
This function overloads sendPostedEvents().

Dispatches all posted events, i.e. empties the event queue.


sendPostedEvents

public static void sendPostedEvents(QObject receiver,
                                    int event_type)
Immediately dispatches all events which have been previously queued with QCoreApplication::postEvent() and which are for the object receiver and have the event type event_type.

Events from the window system are not dispatched by this function, but by processEvents().

If receiver is null, the events of event_type are sent for all objects. If event_type is 0, all the events are sent for receiver.

Note: This method must be called from the same thread as its QObject parameter, receiver.

See also:
flush(), and postEvent().


setApplicationName

public static void setApplicationName(java.lang.String application)
This property holds 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.

See also:
organizationName, organizationDomain, and applicationVersion.


setApplicationVersion

public static void setApplicationVersion(java.lang.String version)
This property holds the version of this application.

See also:
applicationName, organizationName, and organizationDomain.


setAttribute

public static void setAttribute(Qt.ApplicationAttribute attribute)
Sets the attribute attribute if 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.

See also:
testAttribute().


setAttribute

public static void setAttribute(Qt.ApplicationAttribute attribute,
                                boolean on)
Sets the attribute attribute if 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.

See also:
testAttribute().


setLibraryPaths

public static void setLibraryPaths(java.util.List arg__1)
Sets the list of directories to search when loading libraries to paths. All existing paths will be deleted and the path list will consist of the paths given in paths.

See also:
libraryPaths(), addLibraryPath(), removeLibraryPath(), and QLibrary.


setOrganizationDomain

public static void setOrganizationDomain(java.lang.String orgDomain)
This property holds 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.

See also:
organizationName, applicationName, and applicationVersion.


setOrganizationName

public static void setOrganizationName(java.lang.String orgName)
This property holds 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.

See also:
organizationDomain, and applicationName.


startingUp

public static boolean startingUp()
Returns true if an application object has not been created yet; otherwise returns false.

See also:
closingDown().


testAttribute

public static boolean testAttribute(Qt.ApplicationAttribute attribute)
Returns true if attribute attribute is set; otherwise returns false.

See also:
setAttribute().


translate

public static java.lang.String translate(java.lang.String context,
                                         java.lang.String sourceText,
                                         java.lang.String comment)
Returns the translation text for 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.

context is typically a class name (e.g., "MyDialog") and sourceText is either English text or a short identifying text.

comment is a disambiguating comment, for when the same sourceText is used in different roles within the same context. By default, it is null. encoding indicates the 8-bit encoding of character stings See the QTranslator documentation for more information about contexts and comments.


translate

public static java.lang.String translate(java.lang.String context,
                                         java.lang.String sourceText)
This is an overloaded function provided for convenience.


translate

public static java.lang.String translate(java.lang.String context,
                                         java.lang.String sourceText,
                                         java.lang.String comment,
                                         int n)
Returns the translation text for 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.

context is typically a class name (e.g., "MyDialog") and sourceText is either English text or a short identifying text.

comment is a disambiguating comment, for when the same sourceText is used in different roles within the same context. By default, it is null. encoding indicates the 8-bit encoding of character stings See the QTranslator documentation for more information about contexts and comments.

n is used in conjunction with %n to support plural forms. See QObject.tr() for details.


initialize

public static void initialize(java.lang.String[] args)
QCoreApplication keeps a unique instance of a QCoreApplication. It is initialized with this function.


invokeLater

public static void invokeLater(java.lang.Runnable runnable)
This function will queue the runnable and invokes it later.


invokeAndWait

public static void invokeAndWait(java.lang.Runnable runnable)
Executes the runnable's run() method in the main thread and waits for it to return. If the current thread is not the main thread, an event loop must be running in the main thread, or this method will wait indefinitely.


invokeLater

public static void invokeLater(int timeout,
                               java.lang.Runnable task)
Executes the task in the application's main thread after the specified timeout. This is done by starting a timer so this method does not block.

Parameters:
timeout - The time to wait, in milliseconds
task - The task to perform...