QObject Class The QObject class is the base class of all Qt objects. More... Header: #include <QObject> qmake: QT += core Instantiated By: QtObject Inherited By: Q3DObject, Q3DScene, Q3DTheme, QAbstract3DAxis, QAbstract3DInputHandler, QAbstract3DSeries, QAbstractAnimation, QAbstractAudioDeviceInfo, QAbstractAudioInput, QAbstractAudioOutput, QAbstractAxis, QAbstractDataProxy, QAbstractEventDispatcher, QAbstractItemDelegate, QAbstractItemModel, QAbstractMessageHandler, QAbstractNetworkCache, QAbstractOAuth, QAbstractOAuthReplyHandler, QAbstractSeries, QAbstractState, QAbstractTextDocumentLayout, QAbstractTransition, QAbstractUriResolver, QAbstractVideoFilter, QAbstractVideoSurface, QAccessiblePlugin, QAction, QActionGroup, QAudioInput, QAudioOutput, QAudioProbe, QAudioSystemPlugin, QAxFactory, QAxObject, QAxScript, QAxScriptManager, QBarSet, QBluetoothDeviceDiscoveryAgent, QBluetoothLocalDevice, QBluetoothServer, QBluetoothServiceDiscoveryAgent, QBluetoothTransferManager, QBluetoothTransferReply, QBoxSet, QButtonGroup, QCameraExposure, QCameraFocus, QCameraImageCapture, QCameraImageProcessing, QCanBus, QCanBusDevice, QCandlestickModelMapper, QCandlestickSet, QClipboard, QCompleter, QCoreApplication, QCustom3DItem, QDataWidgetMapper, QDBusAbstractAdaptor, QDBusAbstractInterface, QDBusPendingCallWatcher, QDBusServer, QDBusServiceWatcher, QDBusVirtualObject, QDesignerFormEditorInterface, QDesignerFormWindowManagerInterface, QDnsLookup, QDrag, QEventLoop, QExtensionFactory, QExtensionManager, QFileSelector, QFileSystemWatcher, QGamepad, QGamepadKeyNavigation, QGamepadManager, QGenericPlugin, QGeoAreaMonitorSource, QGeoCodeReply, QGeoCodingManager, QGeoCodingManagerEngine, QGeoPositionInfoSource, QGeoRouteReply, QGeoRoutingManager, QGeoRoutingManagerEngine, QGeoSatelliteInfoSource, QGeoServiceProvider, QGesture, QGLShader, QGLShaderProgram, QGraphicsAnchor, QGraphicsEffect, QGraphicsItemAnimation, QGraphicsObject, QGraphicsScene, QGraphicsTransform, QHelpEngineCore, QHelpSearchEngine, QHttpMultiPart, QIconEnginePlugin, QImageIOPlugin, QInAppProduct, QInAppStore, QInAppTransaction, QInputMethod, QIODevice, QItemSelectionModel, QJSEngine, QLayout, QLegendMarker, QLibrary, QLocalServer, QLowEnergyController, QLowEnergyService, QMacToolBar, QMacToolBarItem, QMaskGenerator, QMediaControl, QMediaObject, QMediaPlaylist, QMediaRecorder, QMediaService, QMediaServiceProviderPlugin, QMimeData, QModbusDevice, QModbusReply, QMovie, QNearFieldManager, QNearFieldShareManager, QNearFieldShareTarget, QNearFieldTarget, QNetworkAccessManager, QNetworkConfigurationManager, QNetworkCookieJar, QNetworkSession, QObjectCleanupHandler, QOffscreenSurface, QOpenGLContext, QOpenGLContextGroup, QOpenGLDebugLogger, QOpenGLShader, QOpenGLShaderProgram, QOpenGLTimeMonitor, QOpenGLTimerQuery, QOpenGLVertexArrayObject, QPdfWriter, QPictureFormatPlugin, QPieSlice, QPlaceManager, QPlaceManagerEngine, QPlaceReply, QPluginLoader, QQmlComponent, QQmlContext, QQmlExpression, QQmlExtensionPlugin, QQmlFileSelector, QQmlNdefRecord, QQmlPropertyMap, QQuickImageResponse, QQuickItem, QQuickItemGrabResult, QQuickRenderControl, QQuickTextDocument, QQuickTextureFactory, QQuickWebEngineProfile, QQuickWebEngineScript, QRadioData, QRemoteObjectNode, QRemoteObjectReplica, QScreen, QScriptEngine, QScriptEngineDebugger, QScriptExtensionPlugin, QScroller, QScxmlDataModel, QScxmlInvokableService, QScxmlInvokableServiceFactory, QScxmlStateMachine, QSensor, QSensorBackend, QSensorGesture, QSensorGestureManager, QSensorGestureRecognizer, QSensorReading, QSessionManager, QSettings, QSGAbstractRenderer, QSGEngine, QSGTexture, QSGTextureProvider, QSharedMemory, QShortcut, QSignalMapper, QSignalSpy, QSocketNotifier, QSound, QSoundEffect, QSqlDriver, QSqlDriverPlugin, QStyle, QStyleHints, QStylePlugin, QSvgRenderer, QSyntaxHighlighter, QSystemTrayIcon, Qt3DAnimation8b7c:f320:99b9:690f:4595:cd17:293a:c069QAbstractAnimation, Qt3DAnimation8b7c:f320:99b9:690f:4595:cd17:293a:c069QAnimationController, Qt3DAnimation8b7c:f320:99b9:690f:4595:cd17:293a:c069QAnimationGroup, Qt3DAnimation8b7c:f320:99b9:690f:4595:cd17:293a:c069QMorphTarget, Qt3DCor8b7c:f320:99b9:690f:4595:cd17:293a:c069QAbstractAspect, Qt3DCor8b7c:f320:99b9:690f:4595:cd17:293a:c069QAspectEngine, Qt3DCor8b7c:f320:99b9:690f:4595:cd17:293a:c069QNode, Qt3DCor8b7c:f320:99b9:690f:4595:cd17:293a:c069Quick8b7c:f320:99b9:690f:4595:cd17:293a:c069QQmlAspectEngine, Qt3DInput8b7c:f320:99b9:690f:4595:cd17:293a:c069QKeyEvent, Qt3DInput8b7c:f320:99b9:690f:4595:cd17:293a:c069QMouseEvent, Qt3DInput8b7c:f320:99b9:690f:4595:cd17:293a:c069QWheelEvent, Qt3DRender8b7c:f320:99b9:690f:4595:cd17:293a:c069QGraphicsApiFilter, Qt3DRender8b7c:f320:99b9:690f:4595:cd17:293a:c069QPickEvent, Qt3DRender8b7c:f320:99b9:690f:4595:cd17:293a:c069QRenderCaptureReply, Qt3DRender8b7c:f320:99b9:690f:4595:cd17:293a:c069QStencilOperationArguments, Qt3DRender8b7c:f320:99b9:690f:4595:cd17:293a:c069QStencilTestArguments, Qt3DRender8b7c:f320:99b9:690f:4595:cd17:293a:c069QTextureWrapMode, QTcpServer, QTextDocument, QTextObject, QTextToSpeech, QThread, QThreadPool, QTimeLine, QTimer, QTranslator, QUiLoader, QUndoGroup, QUndoStack, QValidator, QValue3DAxisFormatter, QVideoProbe, QWaylandClient, QWaylandSurfaceGrabber, QWaylandView, QWebChannel, QWebChannelAbstractTransport, QWebEngineCookieStore, QWebEngineDownloadItem, QWebEnginePage, QWebEngineProfile, QWebEngineUrlRequestInterceptor, QWebEngineUrlRequestJob, QWebEngineUrlSchemeHandler, QWebSocket, QWebSocketServer, QWidget, QWindow, QWinEventNotifier, QWinJumpList, QWinTaskbarButton, QWinTaskbarProgress, QWinThumbnailToolBar, and QWinThumbnailToolButton List of all members, including inherited members Obsolete members Note: All functions in this class are reentrant. Note: These functions are also thread-safe: connect(const QObject *sender, const char *signal, const QObject *receiver, const char *method, Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069onnectionType type) connect(const QObject *sender, const char *signal, const char *method, Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069onnectionType type) connect(const QObject *sender, PointerToMemberFunction signal, const QObject *receiver, PointerToMemberFunction method, Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069onnectionType type) connect(const QObject *sender, PointerToMemberFunction signal, Functor functor) connect(const QObject *sender, PointerToMemberFunction signal, const QObject *context, Functor functor, Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069onnectionType type) disconnect(const QObject *sender, const char *signal, const QObject *receiver, const char *method) disconnect(const char *signal, const QObject *receiver, const char *method) disconnect(const QObject *sender, PointerToMemberFunction signal, const QObject *receiver, PointerToMemberFunction method) Properties objectName : QString Public Functions QObject(QObject *parent = Q_NULLPTR) virtual ~QObject() bool blockSignals(bool block) const QObjectList & children() const QMetaObject8b7c:f320:99b9:690f:4595:cd17:293a:c069onnection connect(const QObject *sender, const char *signal, const char *method, Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069onnectionType type = Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069utoConnection) const bool disconnect(const char *signal = Q_NULLPTR, const QObject *receiver = Q_NULLPTR, const char *method = Q_NULLPTR) const bool disconnect(const QObject *receiver, const char *method = Q_NULLPTR) const void dumpObjectInfo() const void dumpObjectTree() const QList<QByteArray> dynamicPropertyNames() const virtual bool event(QEvent *e) virtual bool eventFilter(QObject *watched, QEvent *event) T findChild(const QString &name = QString(), Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069indChildOptions options = Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069indChildrenRecursively) const QList<T> findChildren(const QString &name = QString(), Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069indChildOptions options = Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069indChildrenRecursively) const QList<T> findChildren(const QRegExp &regExp, Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069indChildOptions options = Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069indChildrenRecursively) const QList<T> findChildren(const QRegularExpression &re, Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069indChildOptions options = Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069indChildrenRecursively) const bool inherits(const char *className) const void installEventFilter(QObject *filterObj) bool isWidgetType() const bool isWindowType() const void killTimer(int id) virtual const QMetaObject * metaObject() const void moveToThread(QThread *targetThread) QString objectName() const QObject * parent() const QVariant property(const char *name) const void removeEventFilter(QObject *obj) void setObjectName(const QString &name) void setParent(QObject *parent) bool setProperty(const char *name, const QVariant &value) bool signalsBlocked() const int startTimer(int interval, Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069TimerType timerType = Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069oarseTimer) int startTimer(st8b7c:f320:99b9:690f:4595:cd17:293a:c069chrono8b7c:f320:99b9:690f:4595:cd17:293a:c069milliseconds time, Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069TimerType timerType = Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069oarseTimer) QThread * thread() const Public Slots void deleteLater() Signals void destroyed(QObject *obj = Q_NULLPTR) void objectNameChanged(const QString &objectName) Static Public Members QMetaObject8b7c:f320:99b9:690f:4595:cd17:293a:c069onnection connect(const QObject *sender, const char *signal, const QObject *receiver, const char *method, Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069onnectionType type = Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069utoConnection) QMetaObject8b7c:f320:99b9:690f:4595:cd17:293a:c069onnection connect(const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &method, Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069onnectionType type = Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069utoConnection) QMetaObject8b7c:f320:99b9:690f:4595:cd17:293a:c069onnection connect(const QObject *sender, PointerToMemberFunction signal, const QObject *receiver, PointerToMemberFunction method, Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069onnectionType type = Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069utoConnection) QMetaObject8b7c:f320:99b9:690f:4595:cd17:293a:c069onnection connect(const QObject *sender, PointerToMemberFunction signal, Functor functor) QMetaObject8b7c:f320:99b9:690f:4595:cd17:293a:c069onnection connect(const QObject *sender, PointerToMemberFunction signal, const QObject *context, Functor functor, Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069onnectionType type = Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069utoConnection) bool disconnect(const QObject *sender, const char *signal, const QObject *receiver, const char *method) bool disconnect(const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &method) bool disconnect(const QMetaObject8b7c:f320:99b9:690f:4595:cd17:293a:c069onnection &connection) bool disconnect(const QObject *sender, PointerToMemberFunction signal, const QObject *receiver, PointerToMemberFunction method) const QMetaObject staticMetaObject QString tr(const char *sourceText, const char *disambiguation = Q_NULLPTR, int n = -1) Protected Functions virtual void childEvent(QChildEvent *event) virtual void connectNotify(const QMetaMethod &signal) virtual void customEvent(QEvent *event) virtual void disconnectNotify(const QMetaMethod &signal) bool isSignalConnected(const QMetaMethod &signal) const int receivers(const char *signal) const QObject * sender() const int senderSignalIndex() const virtual void timerEvent(QTimerEvent *event) Related Non-Members typedef QObjectList QList<T> qFindChildren(const QObject *obj, const QRegExp &regExp) T qobject_cast(QObject *object) Macros QT_NO_NARROWING_CONVERSIONS_IN_CONNECT Q_CLASSINFO(Name, Value) Q_DISABLE_COPY(Class) Q_EMIT Q_ENUM(...) Q_ENUM_NS(...) Q_FLAG(...) Q_FLAG_NS(...) Q_GADGET Q_INTERFACES(...) Q_INVOKABLE Q_OBJECT Q_PROPERTY(...) Q_REVISION Q_SET_OBJECT_NAME(Object) Q_SIGNAL Q_SIGNALS Q_SLOT Q_SLOTS Detailed Description The QObject class is the base class of all Qt objects. QObject is the heart of the Qt Object Model. The central feature in this model is a very powerful mechanism for seamless object communication called signals and slots. You can connect a signal to a slot with connect() and destroy the connection with disconnect(). To avoid never ending notification loops you can temporarily block signals with blockSignals(). The protected functions connectNotify() and disconnectNotify() make it possible to track connections. QObjects organize themselves in object trees. When you create a QObject with another object as parent, the object will automatically add itself to the parent's children() list. The parent takes ownership of the object; i.e., it will automatically delete its children in its destructor. You can look for an object by name and optionally type using findChild() or findChildren(). Every object has an objectName() and its class name can be found via the corresponding metaObject() (see QMetaObject8b7c:f320:99b9:690f:4595:cd17:293a:c069lassName()). You can determine whether the object's class inherits another class in the QObject inheritance hierarchy by using the inherits() function. When an object is deleted, it emits a destroyed() signal. You can catch this signal to avoid dangling references to QObjects. QObjects can receive events through event() and filter the events of other objects. See installEventFilter() and eventFilter() for details. A convenience handler, childEvent(), can be reimplemented to catch child events. Last but not least, QObject provides the basic timer support in Qt; see QTimer for high-level support for timers. Notice that the Q_OBJECT macro is mandatory for any object that implements signals, slots or properties. You also need to run the Meta Object Compiler on the source file. We strongly recommend the use of this macro in all subclasses of QObject regardless of whether or not they actually use signals, slots and properties, since failure to do so may lead certain functions to exhibit strange behavior. All Qt widgets inherit QObject. The convenience function isWidgetType() returns whether an object is actually a widget. It is much faster than qobject_cast<QWidget *>(obj) or obj->inherits("QWidget"). Some QObject functions, e.g. children(), return a QObjectList. QObjectList is a typedef for QList<QObject *>. Thread Affinity A QObject instance is said to have a thread affinity, or that it lives in a certain thread. When a QObject receives a queued signal or a posted event, the slot or event handler will run in the thread that the object lives in. Note: If a QObject has no thread affinity (that is, if thread() returns zero), or if it lives in a thread that has no running event loop, then it cannot receive queued signals or posted events. By default, a QObject lives in the thread in which it is created. An object's thread affinity can be queried using thread() and changed using moveToThread(). All QObjects must live in the same thread as their parent. Consequently: setParent() will fail if the two QObjects involved live in different threads. When a QObject is moved to another thread, all its children will be automatically moved too. moveToThread() will fail if the QObject has a parent. If QObjects are created within QThr8b7c:f320:99b9:690f:4595:cd17:293a:c069run(), they cannot become children of the QThread object because the QThread does not live in the thread that calls QThr8b7c:f320:99b9:690f:4595:cd17:293a:c069run(). Note: A QObject's member variables do not automatically become its children. The parent-child relationship must be set by either passing a pointer to the child's constructor, or by calling setParent(). Without this step, the object's member variables will remain in the old thread when moveToThread() is called. No Copy Constructor or Assignment Operator QObject has neither a copy constructor nor an assignment operator. This is by design. Actually, they are declared, but in a private section with the macro Q_DISABLE_COPY(). In fact, all Qt classes derived from QObject (direct or indirect) use this macro to declare their copy constructor and assignment operator to be private. The reasoning is found in the discussion on Identity vs Value on the Qt Object Model page. The main consequence is that you should use pointers to QObject (or to your QObject subclass) where you might otherwise be tempted to use your QObject subclass as a value. For example, without a copy constructor, you can't use a subclass of QObject as the value to be stored in one of the container classes. You must store pointers. Auto-Connection Qt's meta-object system provides a mechanism to automatically connect signals and slots between QObject subclasses and their children. As long as objects are defined with suitable object names, and slots follow a simple naming convention, this connection can be performed at run-time by the QMetaObject8b7c:f320:99b9:690f:4595:cd17:293a:c069onnectSlotsByName() function. uic generates code that invokes this function to enable auto-connection to be performed between widgets on forms created with Qt Designer. More information about using auto-connection with Qt Designer is given in the Using a Designer UI File in Your Application section of the Qt Designer manual. Dynamic Properties From Qt 4.2, dynamic properties can be added to and removed from QObject jennifer33@example.net. Dynamic properties do not need to be declared at compile-time, yet they provide the same advantages as static properties and are manipulated using the same API - using property() to read them and setProperty() to write them. From Qt 4.3, dynamic properties are supported by Qt Designer, and both standard Qt widgets and user-created forms can be given dynamic properties. Internationalization (I18n) All QObject subclasses support Qt's translation features, making it possible to translate an application's user interface into different languages. To make user-visible text translatable, it must be wrapped in calls to the tr() function. This is explained in detail in the Writing Source Code for Translation document. See also QMetaObject, QPointer, QObjectCleanupHandler, Q_DISABLE_COPY(), and Object Trees & Ownership. Property Documentation objectName : QString This property holds the name of this object You can find an object by name (and type) using findChild(). You can find a set of objects with findChildren(). qDebug("MyClass8b7c:f320:99b9:690f:4595:cd17:293a:c069setPrecision(): (%s) invalid precision %f", qPrintable(objectName()), newPrecision); By default, this property contains an empty string. Access functions: QString objectName() const void setObjectName(const QString &name) Notifier signal: void objectNameChanged(const QString &objectName) [see note below] Note: This is a private signal. It can be used in signal connections but cannot be emitted by the user. See also metaObject() and QMetaObject8b7c:f320:99b9:690f:4595:cd17:293a:c069lassName(). Member Function Documentation QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069QObject(QObject *parent = Q_NULLPTR) Constructs an object with parent object parent. The parent of an object may be viewed as the object's owner. For instance, a dialog box is the parent of the OK and Cancel buttons it contains. The destructor of a parent object destroys all child objects. Setting parent to 0 constructs an object with no parent. If the object is a widget, it will become a top-level window. See also parent(), findChild(), and findChildren(). [virtual] QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069~QObject() Destroys the object, deleting all its child objects. All signals to and from the object are automatically disconnected, and any pending posted events for the object are removed from the event queue. However, it is often safer to use deleteLater() rather than deleting a QObject subclass directly. Warning: All child objects are deleted. If any of these objects are on the stack or global, sooner or later your program will crash. We do not recommend holding pointers to child objects from outside the parent. If you still do, the destroyed() signal gives you an opportunity to detect when an object is destroyed. Warning: Deleting a QObject while pending events are waiting to be delivered can cause a crash. You must not delete the QObject directly if it exists in a different thread than the one currently executing. Use deleteLater() instead, which will cause the event loop to delete the object after all pending events have been delivered to it. See also deleteLater(). bool QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069lockSignals(bool block) If block is true, signals emitted by this object are blocked (i.e., emitting a signal will not invoke anything connected to it). If block is false, no such blocking will occur. The return value is the previous value of signalsBlocked(). Note that the destroyed() signal will be emitted even if the signals for this object have been blocked. Signals emitted while being blocked are not buffered. See also signalsBlocked() and QSignalBlocker. [virtual protected] void QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069hildEvent(QChildEvent *event) This event handler can be reimplemented in a subclass to receive child events. The event is passed in the event parameter. QEvent8b7c:f320:99b9:690f:4595:cd17:293a:c069hildAdded and QEvent8b7c:f320:99b9:690f:4595:cd17:293a:c069hildRemoved events are sent to objects when children are added or removed. In both cases you can only rely on the child being a QObject, or if isWidgetType() returns true, a QWidget. (This is because, in the ChildAdded case, the child is not yet fully constructed, and in the ChildRemoved case it might have been destructed already). QEvent8b7c:f320:99b9:690f:4595:cd17:293a:c069hildPolished events are sent to widgets when children are polished, or when polished children are added. If you receive a child polished event, the child's construction is usually completed. However, this is not guaranteed, and multiple polish events may be delivered during the execution of a widget's constructor. For every child widget, you receive one ChildAdded event, zero or more ChildPolished events, and one ChildRemoved event. The ChildPolished event is omitted if a child is removed immediately after it is added. If a child is polished several times during construction and destruction, you may receive several child polished events for the same child, each time with a different virtual table. See also event(). const QObjectList &QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069hildren() const Returns a list of child objects. The QObjectList class is defined in the <QObject> header file as the following: typedef QList<QObject*> QObjectList; The first child added is the first object in the list and the last child added is the last object in the list, i.e. new children are appended at the end. Note that the list order changes when QWidget children are raised or lowered. A widget that is raised becomes the last object in the list, and a widget that is lowered becomes the first object in the list. See also findChild(), findChildren(), parent(), and setParent(). [static] QMetaObject8b7c:f320:99b9:690f:4595:cd17:293a:c069onnection QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069onnect(const QObject *sender, const char *signal, const QObject *receiver, const char *method, Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069onnectionType type = Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069utoConnection) Creates a connection of the given type from the signal in the sender object to the method in the receiver object. Returns a handle to the connection that can be used to disconnect it later. You must use the SIGNAL() and SLOT() macros when specifying the signal and the method, for example: QLabel *label = new QLabel; QScrollBar *scrollBar = new QScrollBar; QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069onnect(scrollBar, SIGNAL(valueChanged(int)), label, SLOT(setNum(int))); This example ensures that the label always displays the current scroll bar value. Note that the signal and slots parameters must not contain any variable names, only the type. E.g. the following would not work and return false: // WRONG QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069onnect(scrollBar, SIGNAL(valueChanged(int value)), label, SLOT(setNum(int value))); A signal can also be connected to another signal: class MyWidget : public QWidget { Q_OBJECT public: MyWidget(); signals: void buttonClicked(); private: QPushButton *myButton; }; MyWidget8b7c:f320:99b9:690f:4595:cd17:293a:c069MyWidget() { myButton = new QPushButton(this); connect(myButton, SIGNAL(clicked()), this, SIGNAL(buttonClicked())); } In this example, the MyWidget constructor relays a signal from a private member variable, and makes it available under a name that relates to MyWidget. A signal can be connected to many slots and signals. Many signals can be connected to one slot. If a signal is connected to several slots, the slots are activated in the same order in which the connections were made, when the signal is emitted. The function returns a QMetaObject8b7c:f320:99b9:690f:4595:cd17:293a:c069onnection that represents a handle to a connection if it successfully connects the signal to the slot. The connection handle will be invalid if it cannot create the connection, for example, if QObject is unable to verify the existence of either signal or method, or if their signatures aren't compatible. You can check if the handle is valid by casting it to a bool. By default, a signal is emitted for every connection you make; two signals are emitted for duplicate connections. You can break all of these connections with a single disconnect() call. If you pass the Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069UniqueConnection type, the connection will only be made if it is not a duplicate. If there is already a duplicate (exact same signal to the exact same slot on the same objects), the connection will fail and connect will return an invalid QMetaObject8b7c:f320:99b9:690f:4595:cd17:293a:c069onnection. Note: Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069UniqueConnections do not work for lambdas, non-member functions and functors; they only apply to connecting to member functions. The optional type parameter describes the type of connection to establish. In particular, it determines whether a particular signal is delivered to a slot immediately or queued for delivery at a later time. If the signal is queued, the parameters must be of types that are known to Qt's meta-object system, because Qt needs to copy the arguments to store them in an event behind the scenes. If you try to use a queued connection and get the error message QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069onnect: Cannot queue arguments of type 'MyType' (Make sure 'MyType' is registered using qRegisterMetaType().) call qRegisterMetaType() to register the data type before you establish the connection. Note: This function is thread-safe. See also disconnect(), sender(), qRegisterMetaType(), Q_DECLARE_METATYPE(), and Differences between String-Based and Functor-Based Connections. [static] QMetaObject8b7c:f320:99b9:690f:4595:cd17:293a:c069onnection QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069onnect(const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &method, Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069onnectionType type = Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069utoConnection) Creates a connection of the given type from the signal in the sender object to the method in the receiver object. Returns a handle to the connection that can be used to disconnect it later. The Connection handle will be invalid if it cannot create the connection, for example, the parameters were invalid. You can check if the QMetaObject8b7c:f320:99b9:690f:4595:cd17:293a:c069onnection is valid by casting it to a bool. This function works in the same way as connect(const QObject *sender, const char *signal, const QObject *receiver, const char *method, Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069onnectionType type) but it uses QMetaMethod to specify signal and method. This function was introduced in Qt 4.8. See also connect(const QObject *sender, const char *signal, const QObject *receiver, const char *method, Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069onnectionType type). QMetaObject8b7c:f320:99b9:690f:4595:cd17:293a:c069onnection QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069onnect(const QObject *sender, const char *signal, const char *method, Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069onnectionType type = Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069utoConnection) const This function overloads connect(). Connects signal from the sender object to this object's method. Equivalent to connect(sender, signal, this, method, type). Every connection you make emits a signal, so duplicate connections emit two signals. You can break a connection using disconnect(). Note: This function is thread-safe. See also disconnect(). [static] QMetaObject8b7c:f320:99b9:690f:4595:cd17:293a:c069onnection QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069onnect(const QObject *sender, PointerToMemberFunction signal, const QObject *receiver, PointerToMemberFunction method, Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069onnectionType type = Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069utoConnection) This function overloads connect(). Creates a connection of the given type from the signal in the sender object to the method in the receiver object. Returns a handle to the connection that can be used to disconnect it later. The signal must be a function declared as a signal in the header. The slot function can be any member function that can be connected to the signal. A slot can be connected to a given signal if the signal has at least as many arguments as the slot, and there is an implicit conversion between the types of the corresponding arguments in the signal and the slot. Example: QLabel *label = new QLabel; QLineEdit *lineEdit = new QLineEdit; QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069onnect(lineEdit, &QLineEdit8b7c:f320:99b9:690f:4595:cd17:293a:c069textChanged, label, &QLabel8b7c:f320:99b9:690f:4595:cd17:293a:c069setText); This example ensures that the label always displays the current line edit text. A signal can be connected to many slots and signals. Many signals can be connected to one slot. If a signal is connected to several slots, the slots are activated in the same order as the order the connection was made, when the signal is emitted The function returns an handle to a connection if it successfully connects the signal to the slot. The Connection handle will be invalid if it cannot create the connection, for example, if QObject is unable to verify the existence of signal (if it was not declared as a signal) You can check if the QMetaObject8b7c:f320:99b9:690f:4595:cd17:293a:c069onnection is valid by casting it to a bool. By default, a signal is emitted for every connection you make; two signals are emitted for duplicate connections. You can break all of these connections with a single disconnect() call. If you pass the Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069UniqueConnection type, the connection will only be made if it is not a duplicate. If there is already a duplicate (exact same signal to the exact same slot on the same objects), the connection will fail and connect will return an invalid QMetaObject8b7c:f320:99b9:690f:4595:cd17:293a:c069onnection. The optional type parameter describes the type of connection to establish. In particular, it determines whether a particular signal is delivered to a slot immediately or queued for delivery at a later time. If the signal is queued, the parameters must be of types that are known to Qt's meta-object system, because Qt needs to copy the arguments to store them in an event behind the scenes. If you try to use a queued connection and get the error message QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069onnect: Cannot queue arguments of type 'MyType' (Make sure 'MyType' is registered using qRegisterMetaType().) make sure to declare the argument type with Q_DECLARE_METATYPE Overloaded functions can be resolved with help of qOverload. Note: This function is thread-safe. See also Differences between String-Based and Functor-Based Connections. [static] QMetaObject8b7c:f320:99b9:690f:4595:cd17:293a:c069onnection QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069onnect(const QObject *sender, PointerToMemberFunction signal, Functor functor) This function overloads connect(). Creates a connection from signal in sender object to functor, and returns a handle to the connection The signal must be a function declared as a signal in the header. The slot function can be any function or functor that can be connected to the signal. A function can be connected to a given signal if the signal as at least as many argument as the slot. A functor can be connected to a signal if they have exactly the same number of arguments. There must exist implicit conversion between the types of the corresponding arguments in the signal and the slot. Example: void someFunction(); QPushButton *button = new QPushButton; QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069onnect(button, &QPushButton8b7c:f320:99b9:690f:4595:cd17:293a:c069licked, someFunction); Lambda expressions can also be used: QByteArray page = ...; QTcpSocket *socket = new QTcpSocket; socket->connectToHost("qt-project.org", 80); QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069onnect(socket, &QTcpSocket8b7c:f320:99b9:690f:4595:cd17:293a:c069onnected, [=] () { socket->write("GET " + page + "\r\n"); }); The connection will automatically disconnect if the sender is destroyed. However, you should take care that any objects used within the functor are still alive when the signal is emitted. Overloaded functions can be resolved with help of qOverload. Note: This function is thread-safe. [static] QMetaObject8b7c:f320:99b9:690f:4595:cd17:293a:c069onnection QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069onnect(const QObject *sender, PointerToMemberFunction signal, const QObject *context, Functor functor, Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069onnectionType type = Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069utoConnection) This function overloads connect(). Creates a connection of a given type from signal in sender object to functor to be placed in a specific event loop of context, and returns a handle to the connection. Note: Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069UniqueConnections do not work for lambdas, non-member functions and functors; they only apply to connecting to member functions. The signal must be a function declared as a signal in the header. The slot function can be any function or functor that can be connected to the signal. A function can be connected to a given signal if the signal as at least as many argument as the slot. A functor can be connected to a signal if they have exactly the same number of arguments. There must exist implicit conversion between the types of the corresponding arguments in the signal and the slot. Example: void someFunction(); QPushButton *button = new QPushButton; QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069onnect(button, &QPushButton8b7c:f320:99b9:690f:4595:cd17:293a:c069licked, this, someFunction, Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069QueuedConnection); Lambda expressions can also be used: QByteArray page = ...; QTcpSocket *socket = new QTcpSocket; socket->connectToHost("qt-project.org", 80); QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069onnect(socket, &QTcpSocket8b7c:f320:99b9:690f:4595:cd17:293a:c069onnected, this, [=] () { socket->write("GET " + page + "\r\n"); }, Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069utoConnection); The connection will automatically disconnect if the sender or the context is destroyed. However, you should take care that any objects used within the functor are still alive when the signal is emitted. Overloaded functions can be resolved with help of qOverload. Note: This function is thread-safe. This function was introduced in Qt 5.2. [virtual protected] void QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069onnectNotify(const QMetaMethod &signal) This virtual function is called when something has been connected to signal in this object. If you want to compare signal with a specific signal, you can use QMetaMetho8b7c:f320:99b9:690f:4595:cd17:293a:c069fromSignal() as follows: if (signal == QMetaMetho8b7c:f320:99b9:690f:4595:cd17:293a:c069fromSignal(&MyObject8b7c:f320:99b9:690f:4595:cd17:293a:c069valueChanged)) { // signal is valueChanged } Warning: This function violates the object-oriented principle of modularity. However, it might be useful when you need to perform expensive initialization only if something is connected to a signal. Warning: This function is called from the thread which performs the connection, which may be a different thread from the thread in which this object lives. This function was introduced in Qt 5.0. See also connect() and disconnectNotify(). [virtual protected] void QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069ustomEvent(QEvent *event) This event handler can be reimplemented in a subclass to receive custom events. Custom events are user-defined events with a type value at least as large as the QEvent8b7c:f320:99b9:690f:4595:cd17:293a:c069User item of the QEvent8b7c:f320:99b9:690f:4595:cd17:293a:c069Type enum, and is typically a QEvent subclass. The event is passed in the event parameter. See also event() and QEvent. [slot] void QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069leteLater() Schedules this object for deletion. The object will be deleted when control returns to the event loop. If the event loop is not running when this function is called (e.g. deleteLater() is called on an object before QCoreApplication8b7c:f320:99b9:690f:4595:cd17:293a:c069xec()), the object will be deleted once the event loop is started. If deleteLater() is called after the main event loop has stopped, the object will not be deleted. Since Qt 4.8, if deleteLater() is called on an object that lives in a thread with no running event loop, the object will be destroyed when the thread finishes. Note that entering and leaving a new event loop (e.g., by opening a modal dialog) will not perform the deferred deletion; for the object to be deleted, the control must return to the event loop from which deleteLater() was called. Note: It is safe to call this function more than once; when the first deferred deletion event is delivered, any pending events for the object are removed from the event queue. See also destroyed() and QPointer. [signal] void QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069stroyed(QObject *obj = Q_NULLPTR) This signal is emitted immediately before the object obj is destroyed, and can not be blocked. All the objects's children are destroyed immediately after this signal is emitted. See also deleteLater() and QPointer. [static] bool QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069isconnect(const QObject *sender, const char *signal, const QObject *receiver, const char *method) Disconnects signal in object sender from method in object receiver. Returns true if the connection is successfully broken; otherwise returns false. A signal-slot connection is removed when either of the objects involved are destroyed. disconnect() is typically used in three ways, as the following examples demonstrate. Disconnect everything connected to an object's signals:disconnect(myObject, 0, 0, 0); equivalent to the non-static overloaded function myObject->disconnect(); Disconnect everything connected to a specific signal:disconnect(myObject, SIGNAL(mySignal()), 0, 0); equivalent to the non-static overloaded function myObject->disconnect(SIGNAL(mySignal())); Disconnect a specific receiver:disconnect(myObject, 0, myReceiver, 0); equivalent to the non-static overloaded function myObject->disconnect(myReceiver); 0 may be used as a wildcard, meaning "any signal", "any receiving object", or "any slot in the receiving object", respectively. The sender may never be 0. (You cannot disconnect signals from more than one object in a single call.) If signal is 0, it disconnects receiver and method from any signal. If not, only the specified signal is disconnected. If receiver is 0, it disconnects anything connected to signal. If not, slots in objects other than receiver are not disconnected. If method is 0, it disconnects anything that is connected to receiver. If not, only slots named method will be disconnected, and all other slots are left alone. The method must be 0 if receiver is left out, so you cannot disconnect a specifically-named slot on all objects. Note: This function is thread-safe. See also connect(). [static] bool QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069isconnect(const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &method) Disconnects signal in object sender from method in object receiver. Returns true if the connection is successfully broken; otherwise returns false. This function provides the same possibilities like disconnect(const QObject *sender, const char *signal, const QObject *receiver, const char *method) but uses QMetaMethod to represent the signal and the method to be disconnected. Additionally this function returnsfalse and no signals and slots disconnected if: signal is not a member of sender class or one of its parent classes. method is not a member of receiver class or one of its parent classes. signal instance represents not a signal. QMetaMethod() may be used as wildcard in the meaning "any signal" or "any slot in receiving object". In the same way 0 can be used for receiver in the meaning "any receiving object". In this case method should also be QMetaMethod(). sender parameter should be never 0. This function was introduced in Qt 4.8. See also disconnect(const QObject *sender, const char *signal, const QObject *receiver, const char *method). bool QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069isconnect(const char *signal = Q_NULLPTR, const QObject *receiver = Q_NULLPTR, const char *method = Q_NULLPTR) const This function overloads disconnect(). Disconnects signal from method of receiver. A signal-slot connection is removed when either of the objects involved are destroyed. Note: This function is thread-safe. bool QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069isconnect(const QObject *receiver, const char *method = Q_NULLPTR) const This function overloads disconnect(). Disconnects all signals in this object from receiver's method. A signal-slot connection is removed when either of the objects involved are destroyed. [static] bool QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069isconnect(const QMetaObject8b7c:f320:99b9:690f:4595:cd17:293a:c069onnection &connection) Disconnect a connection. If the connection is invalid or has already been disconnected, do nothing and return false. See also connect(). [static] bool QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069isconnect(const QObject *sender, PointerToMemberFunction signal, const QObject *receiver, PointerToMemberFunction method) This function overloads diconnect(). Disconnects signal in object sender from method in object receiver. Returns true if the connection is successfully broken; otherwise returns false. A signal-slot connection is removed when either of the objects involved are destroyed. disconnect() is typically used in three ways, as the following examples demonstrate. Disconnect everything connected to an object's signals:disconnect(myObject, 0, 0, 0); Disconnect everything connected to a specific signal:disconnect(myObject, &MyObject8b7c:f320:99b9:690f:4595:cd17:293a:c069mySignal(), 0, 0); Disconnect a specific receiver:disconnect(myObject, 0, myReceiver, 0); Disconnect a connection from one specific signal to a specific slot:QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069isconnect(lineEdit, &QLineEdit8b7c:f320:99b9:690f:4595:cd17:293a:c069textChanged, label, &QLabel8b7c:f320:99b9:690f:4595:cd17:293a:c069setText); 0 may be used as a wildcard, meaning "any signal", "any receiving object", or "any slot in the receiving object", respectively. The sender may never be 0. (You cannot disconnect signals from more than one object in a single call.) If signal is 0, it disconnects receiver and method from any signal. If not, only the specified signal is disconnected. If receiver is 0, it disconnects anything connected to signal. If not, slots in objects other than receiver are not disconnected. If method is 0, it disconnects anything that is connected to receiver. If not, only slots named method will be disconnected, and all other slots are left alone. The method must be 0 if receiver is left out, so you cannot disconnect a specifically-named slot on all objects. Note: It is not possible to use this overload to diconnect signals connected to functors or lambda expressions. That is because it is not possible to compare them. Instead, use the overload that takes a QMetaObject8b7c:f320:99b9:690f:4595:cd17:293a:c069onnection Note: This function is thread-safe. See also connect(). [virtual protected] void QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069isconnectNotify(const QMetaMethod &signal) This virtual function is called when something has been disconnected from signal in this object. See connectNotify() for an example of how to compare signal with a specific signal. If all signals were disconnected from this object (e.g., the signal argument to disconnect() was 0), disconnectNotify() is only called once, and the signal will be an invalid QMetaMethod (QMetaMetho8b7c:f320:99b9:690f:4595:cd17:293a:c069isValid() returns false). Warning: This function violates the object-oriented principle of modularity. However, it might be useful for optimizing access to expensive resources. Warning: This function is called from the thread which performs the disconnection, which may be a different thread from the thread in which this object lives. This function may also be called with a QObject internal mutex locked. It is therefore not allowed to re-enter any of any QObject functions from your reimplementation and if you lock a mutex in your reimplementation, make sure that you don't call QObject functions with that mutex held in other places or it will result in a deadlock. This function was introduced in Qt 5.0. See also disconnect() and connectNotify(). void QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069umpObjectInfo() const Dumps information about signal connections, etc. for this object to the debug output. Note: before Qt 5.9, this function was not const. See also dumpObjectTree(). void QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069umpObjectTree() const Dumps a tree of children to the debug output. Note: before Qt 5.9, this function was not const. See also dumpObjectInfo(). QList<QByteArray> QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069ynamicPropertyNames() const Returns the names of all properties that were dynamically added to the object using setProperty(). This function was introduced in Qt 4.2. [virtual] bool QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069vent(QEvent *e) This virtual function receives events to an object and should return true if the event e was recognized and processed. The event() function can be reimplemented to customize the behavior of an object. Make sure you call the parent event class implementation for all the events you did not handle. Example: class MyClass : public QWidget { Q_OBJECT public: MyClass(QWidget *parent = 0); ~MyClass(); bool event(QEvent* ev) { if (ev->type() == QEvent8b7c:f320:99b9:690f:4595:cd17:293a:c069PolishRequest) { // overwrite handling of PolishRequest if any doThings(); return true; } else if (ev->type() == QEvent8b7c:f320:99b9:690f:4595:cd17:293a:c069Show) { // complement handling of Show if any doThings2(); QWidget8b7c:f320:99b9:690f:4595:cd17:293a:c069vent(ev); return true; } // Make sure the rest of events are handled return QWidget8b7c:f320:99b9:690f:4595:cd17:293a:c069vent(ev); } }; See also installEventFilter(), timerEvent(), QCoreApplication8b7c:f320:99b9:690f:4595:cd17:293a:c069sendEvent(), and QCoreApplication8b7c:f320:99b9:690f:4595:cd17:293a:c069postEvent(). [virtual] bool QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069ventFilter(QObject *watched, QEvent *event) Filters events if this object has been installed as an event filter for the watched object. In your reimplementation of this function, if you want to filter the event out, i.e. stop it being handled further, return true; otherwise return false. Example: class MainWindow : public QMainWindow { public: MainWindow(); protected: bool eventFilter(QObject *obj, QEvent *ev); private: QTextEdit *textEdit; }; MainWindow8b7c:f320:99b9:690f:4595:cd17:293a:c069MainWindow() { textEdit = new QTextEdit; setCentralWidget(textEdit); textEdit->installEventFilter(this); } bool MainWindow8b7c:f320:99b9:690f:4595:cd17:293a:c069ventFilter(QObject *obj, QEvent *event) { if (obj == textEdit) { if (event->type() == QEvent8b7c:f320:99b9:690f:4595:cd17:293a:c069KeyPress) { QKeyEvent *keyEvent = static_cast<QKeyEvent*>(event); qDebug() << "Ate key press" << keyEvent->key(); return true; } else { return false; } } else { // pass the event on to the parent class return QMainWindow8b7c:f320:99b9:690f:4595:cd17:293a:c069ventFilter(obj, event); } } Notice in the example above that unhandled events are passed to the base class's eventFilter() function, since the base class might have reimplemented eventFilter() for its own internal purposes. Warning: If you delete the receiver object in this function, be sure to return true. Otherwise, Qt will forward the event to the deleted object and the program might crash. See also installEventFilter(). T QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069indChild(const QString &name = QString(), Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069indChildOptions options = Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069indChildrenRecursively) const Returns the child of this object that can be cast into type T and that is called name, or 0 if there is no such object. Omitting the name argument causes all object names to be matched. The search is performed recursively, unless options specifies the option FindDirectChildrenOnly. If there is more than one child matching the search, the most direct ancestor is returned. If there are several direct ancestors, it is undefined which one will be returned. In that case, findChildren() should be used. This example returns a child QPushButton of parentWidget named "button1", even if the button isn't a direct child of the parent: QPushButton *button = parentWidget->findChild<QPushButton *>("button1"); This example returns a QListWidget child of parentWidget: QListWidget *list = parentWidget->findChild<QListWidget *>(); This example returns a child QPushButton of parentWidget (its direct parent) named "button1": QPushButton *button = parentWidget->findChild<QPushButton *>("button1", Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069indDirectChildrenOnly); This example returns a QListWidget child of parentWidget, its direct parent: QListWidget *list = parentWidget->findChild<QListWidget *>(QString(), Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069indDirectChildrenOnly); See also findChildren(). QList<T> QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069indChildren(const QString &name = QString(), Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069indChildOptions options = Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069indChildrenRecursively) const Returns all children of this object with the given name that can be cast to type T, or an empty list if there are no such objects. Omitting the name argument causes all object names to be matched. The search is performed recursively, unless options specifies the option FindDirectChildrenOnly. The following example shows how to find a list of child QWidgets of the specified parentWidget named widgetname: QList<QWidget *> widgets = parentWidget.findChildren<QWidget *>("widgetname"); This example returns all QPushButtons that are children of parentWidget: QList<QPushButton *> allPButtons = parentWidget.findChildren<QPushButton *>(); This example returns all QPushButtons that are immediate children of parentWidget: QList<QPushButton *> childButtons = parentWidget.findChildren<QPushButton *>(QString(), Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069indDirectChildrenOnly); See also findChild(). QList<T> QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069indChildren(const QRegExp &regExp, Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069indChildOptions options = Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069indChildrenRecursively) const This function overloads findChildren(). Returns the children of this object that can be cast to type T and that have names matching the regular expression regExp, or an empty list if there are no such objects. The search is performed recursively, unless options specifies the option FindDirectChildrenOnly. QList<T> QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069indChildren(const QRegularExpression &re, Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069indChildOptions options = Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069indChildrenRecursively) const This function overloads findChildren(). Returns the children of this object that can be cast to type T and that have names matching the regular expression re, or an empty list if there are no such objects. The search is performed recursively, unless options specifies the option FindDirectChildrenOnly. This function was introduced in Qt 5.0. bool QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069inherits(const char *className) const Returns true if this object is an instance of a class that inherits className or a QObject subclass that inherits className; otherwise returns false. A class is considered to inherit itself. Example: QTimer *timer = new QTimer; // QTimer inherits QObject timer->inherits("QTimer"); // returns true timer->inherits("QObject"); // returns true timer->inherits("QAbstractButton"); // returns false // QVBoxLayout inherits QObject and QLayoutItem QVBoxLayout *layout = new QVBoxLayout; layout->inherits("QObject"); // returns true layout->inherits("QLayoutItem"); // returns true (even though QLayoutItem is not a QObject) If you need to determine whether an object is an instance of a particular class for the purpose of casting it, consider using qobject_cast<Type *>(object) instead. See also metaObject() and qobject_cast(). void QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069installEventFilter(QObject *filterObj) Installs an event filter filterObj on this object. For example: monitoredObj->installEventFilter(filterObj); An event filter is an object that receives all events that are sent to this object. The filter can either stop the event or forward it to this object. The event filter filterObj receives events via its eventFilter() function. The eventFilter() function must return true if the event should be filtered, (i.e. stopped); otherwise it must return false. If multiple event filters are installed on a single object, the filter that was installed last is activated first. Here's a KeyPressEater class that eats the key presses of its monitored objects: class KeyPressEater : public QObject { Q_OBJECT ... protected: bool eventFilter(QObject *obj, QEvent *event); }; bool KeyPressEater8b7c:f320:99b9:690f:4595:cd17:293a:c069ventFilter(QObject *obj, QEvent *event) { if (event->type() == QEvent8b7c:f320:99b9:690f:4595:cd17:293a:c069KeyPress) { QKeyEvent *keyEvent = static_cast<QKeyEvent *>(event); qDebug("Ate key press %d", keyEvent->key()); return true; } else { // standard event processing return QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069ventFilter(obj, event); } } And here's how to install it on two widgets: KeyPressEater *keyPressEater = new KeyPressEater(this); QPushButton *pushButton = new QPushButton(this); QListView *listView = new QListView(this); pushButton->installEventFilter(keyPressEater); listView->installEventFilter(keyPressEater); The QShortcut class, for example, uses this technique to intercept shortcut key presses. Warning: If you delete the receiver object in your eventFilter() function, be sure to return true. If you return false, Qt sends the event to the deleted object and the program will crash. Note that the filtering object must be in the same thread as this object. If filterObj is in a different thread, this function does nothing. If either filterObj or this object are moved to a different thread after calling this function, the event filter will not be called until both objects have the same thread affinity again (it is not removed). See also removeEventFilter(), eventFilter(), and event(). [protected] bool QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069isSignalConnected(const QMetaMethod &signal) const Returns true if the signal is connected to at least one receiver, otherwise returns false. signal must be a signal member of this object, otherwise the behaviour is undefined. static const QMetaMethod valueChangedSignal = QMetaMetho8b7c:f320:99b9:690f:4595:cd17:293a:c069fromSignal(&MyObject8b7c:f320:99b9:690f:4595:cd17:293a:c069valueChanged); if (isSignalConnected(valueChangedSignal)) { QByteArray data; data = get_the_value(); // expensive operation emit valueChanged(data); } As the code snippet above illustrates, you can use this function to avoid emitting a signal that nobody listens to. Warning: This function violates the object-oriented principle of modularity. However, it might be useful when you need to perform expensive initialization only if something is connected to a signal. This function was introduced in Qt 5.0. bool QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069isWidgetType() const Returns true if the object is a widget; otherwise returns false. Calling this function is equivalent to calling inherits("QWidget"), except that it is much faster. bool QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069isWindowType() const Returns true if the object is a window; otherwise returns false. Calling this function is equivalent to calling inherits("QWindow"), except that it is much faster. void QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069killTimer(int id) Kills the timer with timer identifier, id. The timer identifier is returned by startTimer() when a timer event is started. See also timerEvent() and startTimer(). [virtual] const QMetaObject *QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069metaObject() const Returns a pointer to the meta-object of this object. A meta-object contains information about a class that inherits QObject, e.g. class name, superclass name, properties, signals and slots. Every QObject subclass that contains the Q_OBJECT macro will have a meta-object. The meta-object information is required by the signal/slot connection mechanism and the property system. The inherits() function also makes use of the meta-object. If you have no pointer to an actual object instance but still want to access the meta-object of a class, you can use staticMetaObject. Example: QObject *obj = new QPushButton; obj->metaObject()->className(); // returns "QPushButton" QPushButton8b7c:f320:99b9:690f:4595:cd17:293a:c069staticMetaObject.className(); // returns "QPushButton" See also staticMetaObject. void QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069moveToThread(QThread *targetThread) Changes the thread affinity for this object and its children. The object cannot be moved if it has a parent. Event processing will continue in the targetThread. To move an object to the main thread, use QApplication8b7c:f320:99b9:690f:4595:cd17:293a:c069instance() to retrieve a pointer to the current application, and then use QApplication8b7c:f320:99b9:690f:4595:cd17:293a:c069thread() to retrieve the thread in which the application lives. For example: myObject->moveToThread(QApplication8b7c:f320:99b9:690f:4595:cd17:293a:c069instance()->thread()); If targetThread is zero, all event processing for this object and its children stops. Note that all active timers for the object will be reset. The timers are first stopped in the current thread and restarted (with the same interval) in the targetThread. As a result, constantly moving an object between threads can postpone timer events indefinitely. A QEvent8b7c:f320:99b9:690f:4595:cd17:293a:c069ThreadChange event is sent to this object just before the thread affinity is changed. You can handle this event to perform any special processing. Note that any new events that are posted to this object will be handled in the targetThread. Warning: This function is not thread-safe; the current thread must be same as the current thread affinity. In other words, this function can only "push" an object from the current thread to another thread, it cannot "pull" an object from any arbitrary thread to the current thread. See also thread(). [signal] void QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069objectNameChanged(const QString &objectName) This signal is emitted after the object's name has been changed. The new object name is passed as objectName. Note: This is a private signal. It can be used in signal connections but cannot be emitted by the user. Note: Notifier signal for property objectName. See also QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069objectName. QObject *QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069parent() const Returns a pointer to the parent object. See also setParent() and children(). QVariant QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069property(const char *name) const Returns the value of the object's name property. If no such property exists, the returned variant is invalid. Information about all available properties is provided through the metaObject() and dynamicPropertyNames(). See also setProperty(), QVariant8b7c:f320:99b9:690f:4595:cd17:293a:c069isValid(), metaObject(), and dynamicPropertyNames(). [protected] int QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069receivers(const char *signal) const Returns the number of receivers connected to the signal. Since both slots and signals can be used as receivers for signals, and the same connections can be made many times, the number of receivers is the same as the number of connections made from this signal. When calling this function, you can use the SIGNAL() macro to pass a specific signal: if (receivers(SIGNAL(valueChanged(QByteArray))) > 0) { QByteArray data; get_the_value(&data); // expensive operation emit valueChanged(data); } Warning: This function violates the object-oriented principle of modularity. However, it might be useful when you need to perform expensive initialization only if something is connected to a signal. See also isSignalConnected(). void QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069removeEventFilter(QObject *obj) Removes an event filter object obj from this object. The request is ignored if such an event filter has not been installed. All event filters for this object are automatically removed when this object is destroyed. It is always safe to remove an event filter, even during event filter activation (i.e. from the eventFilter() function). See also installEventFilter(), eventFilter(), and event(). [protected] QObject *QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069sender() const Returns a pointer to the object that sent the signal, if called in a slot activated by a signal; otherwise it returns 0. The pointer is valid only during the execution of the slot that calls this function from this object's thread context. The pointer returned by this function becomes invalid if the sender is destroyed, or if the slot is disconnected from the sender's signal. Warning: This function violates the object-oriented principle of modularity. However, getting access to the sender might be useful when many signals are connected to a single slot. Warning: As mentioned above, the return value of this function is not valid when the slot is called via a Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069irectConnection from a thread different from this object's thread. Do not use this function in this type of scenario. See also senderSignalIndex() and QSignalMapper. [protected] int QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069senderSignalIndex() const Returns the meta-method index of the signal that called the currently executing slot, which is a member of the class returned by sender(). If called outside of a slot activated by a signal, -1 is returned. For signals with default parameters, this function will always return the index with all parameters, regardless of which was used with connect(). For example, the signal destroyed(QObject *obj = 0) will have two different indexes (with and without the parameter), but this function will always return the index with a parameter. This does not apply when overloading signals with different parameters. Warning: This function violates the object-oriented principle of modularity. However, getting access to the signal index might be useful when many signals are connected to a single slot. Warning: The return value of this function is not valid when the slot is called via a Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069irectConnection from a thread different from this object's thread. Do not use this function in this type of scenario. This function was introduced in Qt 4.8. See also sender(), QMetaObject8b7c:f320:99b9:690f:4595:cd17:293a:c069indexOfSignal(), and QMetaObject8b7c:f320:99b9:690f:4595:cd17:293a:c069method(). void QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069setParent(QObject *parent) Makes the object a child of parent. See also parent() and children(). bool QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069setProperty(const char *name, const QVariant &value) Sets the value of the object's name property to value. If the property is defined in the class using Q_PROPERTY then true is returned on success and false otherwise. If the property is not defined using Q_PROPERTY, and therefore not listed in the meta-object, it is added as a dynamic property and false is returned. Information about all available properties is provided through the metaObject() and dynamicPropertyNames(). Dynamic properties can be queried again using property() and can be removed by setting the property value to an invalid QVariant. Changing the value of a dynamic property causes a QDynamicPropertyChangeEvent to be sent to the object. Note: Dynamic properties starting with "_q_" are reserved for internal purposes. See also property(), metaObject(), dynamicPropertyNames(), and QMetaProperty8b7c:f320:99b9:690f:4595:cd17:293a:c069write(). bool QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069signalsBlocked() const Returns true if signals are blocked; otherwise returns false. Signals are not blocked by default. See also blockSignals() and QSignalBlocker. int QObject8b7c:f320:99b9:690f:4595:cd17:293a:c069startTimer(int interval, Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069TimerType timerType = Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069oarseTimer) Starts a timer and returns a timer identifier, or returns zero if it could not start a timer. A timer event will occur every interval milliseconds until killTimer() is called. If interval is 0, then the timer event occurs once every time there are no more window system events to process. The virtual timerEvent() function is called with the QTimerEvent event parameter class when a timer event occurs. Reimplement this function to get timer events. If multiple timers are running, the QTimerEvent8b7c:f320:99b9:690f:4595:cd17:293a:c069timerId() can be used to find out which timer was activated. Example: class MyObject : public QObject { Q_OBJECT public: MyObject(QObject *parent = 0); protected: void timerEvent(QTimerEvent *event); }; MyObject8b7c:f320:99b9:690f:4595:cd17:293a:c069MyObject(QObject *parent) : QObject(parent) { startTimer(50); // 50-millisecond timer startTimer(1000); // 1-second timer startTimer(60000); // 1-minute timer using namespace st8b7c:f320:99b9:690f:4595:cd17:293a:c069chrono; startTimer(milliseconds(50)); startTimer(seconds(1)); startTimer(minutes(1)); // since C++14 we can use st8b7c:f320:99b9:690f:4595:cd17:293a:c069chrono8b7c:f320:99b9:690f:4595:cd17:293a:c069uration literals, e.g.: startTimer(100ms); startTimer(5s); startTimer(2min); startTimer(1h); } void MyObject8b7c:f320:99b9:690f:4595:cd17:293a:c069timerEvent(QTimerEvent *event) { qDebug() << "Timer ID:" << event->timerId(); } Note that QTimer's accuracy depends on the underlying operating system and hardware. The timerType argument allows you to customize the accuracy of the timer. See Qt8b7c:f320:99b9:690f:4595:cd17:293a:c069TimerType for
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