Struct qt_core::QStateMachine

#[repr(C)]
pub struct QStateMachine { /* private fields */ }

The QStateMachine class provides a hierarchical finite state machine.

C++ class: QStateMachine.

C++ documentation:

The QStateMachine class provides a hierarchical finite state machine.

QStateMachine is based on the concepts and notation of Statecharts. QStateMachine is part of The State Machine Framework.

A state machine manages a set of states (classes that inherit from QAbstractState) and transitions (descendants of QAbstractTransition) between those states; these states and transitions define a state graph. Once a state graph has been built, the state machine can execute it. QStateMachine's execution algorithm is based on the State Chart XML (SCXML) algorithm. The framework's overview gives several state graphs and the code to build them.

Use the addState() function to add a top-level state to the state machine. States are removed with the removeState() function. Removing states while the machine is running is discouraged.

Before the machine can be started, the initial state must be set. The initial state is the state that the machine enters when started. You can then start() the state machine. The started() signal is emitted when the initial state is entered.

The machine is event driven and keeps its own event loop. Events are posted to the machine through postEvent(). Note that this means that it executes asynchronously, and that it will not progress without a running event loop. You will normally not have to post events to the machine directly as Qt's transitions, e.g., QEventTransition and its subclasses, handle this. But for custom transitions triggered by events, postEvent() is useful.

The state machine processes events and takes transitions until a top-level final state is entered; the state machine then emits the finished() signal. You can also stop() the state machine explicitly. The stopped() signal is emitted in this case.

The following snippet shows a state machine that will finish when a button is clicked:

QPushButton button;
QStateMachine machine;
QState *s1 = new QState();
s1->assignProperty(&button, “text”, “Click me”);
QFinalState *s2 = new QFinalState();
s1->addTransition(&button, SIGNAL(clicked()), s2);
machine.addState(s1);
machine.addState(s2);
machine.setInitialState(s1);
machine.start();

This code example uses QState, which inherits QAbstractState. The QState class provides a state that you can use to set properties and invoke methods on QObjects when the state is entered or exited. It also contains convenience functions for adding transitions, e.g., QSignalTransitions as in this example. See the QState class description for further details.

If an error is encountered, the machine will look for an error state, and if one is available, it will enter this state. The types of errors possible are described by the Error enum. After the error state is entered, the type of the error can be retrieved with error(). The execution of the state graph will not stop when the error state is entered. If no error state applies to the erroneous state, the machine will stop executing and an error message will be printed to the console.

Implementations

impl QStateMachine

pub fn slot_start(&self) -> Receiver<()>

Starts this state machine. The machine will reset its configuration and transition to the initial state. When a final top-level state (QFinalState) is entered, the machine will emit the finished() signal.

Returns a built-in Qt slot QStateMachine::start that can be passed to qt_core::Signal::connect.

C++ documentation:

Starts this state machine. The machine will reset its configuration and transition to the initial state. When a final top-level state (QFinalState) is entered, the machine will emit the finished() signal.

Note: A state machine will not run without a running event loop, such as the main application event loop started with QCoreApplication::exec() or QApplication::exec().

See also started(), finished(), stop(), initialState(), and setRunning().

pub fn slot_stop(&self) -> Receiver<()>

Stops this state machine. The state machine will stop processing events and then emit the stopped() signal.

Returns a built-in Qt slot QStateMachine::stop that can be passed to qt_core::Signal::connect.

C++ documentation:

Stops this state machine. The state machine will stop processing events and then emit the stopped() signal.

See also stopped(), start(), and setRunning().

pub fn slot_set_running(&self) -> Receiver<(bool,)>

This property holds the running state of this state machine

Returns a built-in Qt slot QStateMachine::setRunning that can be passed to qt_core::Signal::connect.

C++ documentation:

This property holds the running state of this state machine

This property was introduced in Qt 5.4.

Access functions:

bool	isRunning() const
void	setRunning(bool running)

Notifier signal:

void	runningChanged(bool running)

See also start(), stop(), started(), stopped(), and runningChanged().

pub fn started(&self) -> Signal<()>

This signal is emitted when the state machine has entered its initial state (QStateMachine::initialState).

Returns a built-in Qt signal QStateMachine::started that can be passed to qt_core::Signal::connect.

C++ documentation:

This signal is emitted when the state machine has entered its initial state (QStateMachine::initialState).

Note: This is a private signal. It can be used in signal connections but cannot be emitted by the user.

See also QStateMachine::finished() and QStateMachine::start().

pub fn stopped(&self) -> Signal<()>

This signal is emitted when the state machine has stopped.

Returns a built-in Qt signal QStateMachine::stopped that can be passed to qt_core::Signal::connect.

C++ documentation:

This signal is emitted when the state machine has stopped.

Note: This is a private signal. It can be used in signal connections but cannot be emitted by the user.

See also QStateMachine::stop() and QStateMachine::finished().

pub fn running_changed(&self) -> Signal<(bool,)>

This signal is emitted when the running property is changed with running as argument.

Returns a built-in Qt signal QStateMachine::runningChanged that can be passed to qt_core::Signal::connect.

C++ documentation:

This signal is emitted when the running property is changed with running as argument.

This function was introduced in Qt 5.4.

Note: Notifier signal for property running.

See also QStateMachine::running.

pub unsafe fn add_default_animation( &self, animation: impl CastInto<Ptr<QAbstractAnimation>> )

Adds a default animation to be considered for any transition.

Calls C++ function: void QStateMachine::addDefaultAnimation(QAbstractAnimation* animation).

C++ documentation:

Adds a default animation to be considered for any transition.

pub unsafe fn add_state(&self, state: impl CastInto<Ptr<QAbstractState>>)

Adds the given state to this state machine. The state becomes a top-level state.

Calls C++ function: void QStateMachine::addState(QAbstractState* state).

C++ documentation:

Adds the given state to this state machine. The state becomes a top-level state.

If the state is already in a different machine, it will first be removed from its old machine, and then added to this machine.

See also removeState() and setInitialState().

pub unsafe fn cancel_delayed_event(&self, id: c_int) -> bool

Cancels the delayed event identified by the given id. The id should be a value returned by a call to postDelayedEvent(). Returns true if the event was successfully cancelled, otherwise returns false.

Calls C++ function: bool QStateMachine::cancelDelayedEvent(int id).

C++ documentation:

Cancels the delayed event identified by the given id. The id should be a value returned by a call to postDelayedEvent(). Returns true if the event was successfully cancelled, otherwise returns false.

Note: This function is thread-safe.

See also postDelayedEvent().

pub unsafe fn clear_error(&self)

Clears the error string and error code of the state machine.

Calls C++ function: void QStateMachine::clearError().

C++ documentation:

Clears the error string and error code of the state machine.

pub unsafe fn configuration(&self) -> CppBox<QSetOfQAbstractState>

Returns the maximal consistent set of states (including parallel and final states) that this state machine is currently in. If a state s is in the configuration, it is always the case that the parent of s is also in c. Note, however, that the machine itself is not an explicit member of the configuration.

Calls C++ function: QSet<QAbstractState*> QStateMachine::configuration() const.

C++ documentation:

Returns the maximal consistent set of states (including parallel and final states) that this state machine is currently in. If a state s is in the configuration, it is always the case that the parent of s is also in c. Note, however, that the machine itself is not an explicit member of the configuration.

pub unsafe fn default_animations(&self) -> CppBox<QListOfQAbstractAnimation>

Returns the list of default animations that will be considered for any transition.

Calls C++ function: QList<QAbstractAnimation*> QStateMachine::defaultAnimations() const.

C++ documentation:

Returns the list of default animations that will be considered for any transition.

pub unsafe fn error(&self) -> Error

Returns the error code of the last error that occurred in the state machine.

Calls C++ function: QStateMachine::Error QStateMachine::error() const.

C++ documentation:

Returns the error code of the last error that occurred in the state machine.

pub unsafe fn error_string(&self) -> CppBox<QString>

This property holds the error string of this state machine

Calls C++ function: QString QStateMachine::errorString() const.

C++ documentation:

This property holds the error string of this state machine

Access functions:

QString

errorString() const

pub unsafe fn event_filter( &self, watched: impl CastInto<Ptr<QObject>>, event: impl CastInto<Ptr<QEvent>> ) -> bool

Reimplemented from QObject::eventFilter().

Calls C++ function: virtual bool QStateMachine::eventFilter(QObject* watched, QEvent* event).

C++ documentation:

Reimplemented from QObject::eventFilter().

pub unsafe fn global_restore_policy(&self) -> RestorePolicy

This property holds the restore policy for states of this state machine.

Calls C++ function: QState::RestorePolicy QStateMachine::globalRestorePolicy() const.

C++ documentation:

This property holds the restore policy for states of this state machine.

The default value of this property is QState::DontRestoreProperties.

Access functions:

QState::RestorePolicy	globalRestorePolicy() const
void	setGlobalRestorePolicy(QState::RestorePolicy restorePolicy)

pub unsafe fn is_animated(&self) -> bool

Returns whether animations are enabled for this state machine.

Calls C++ function: bool QStateMachine::isAnimated() const.

C++ documentation:

Returns whether animations are enabled for this state machine.

Note: Getter function for property animated.

pub unsafe fn is_running(&self) -> bool

This property holds the running state of this state machine

Calls C++ function: bool QStateMachine::isRunning() const.

C++ documentation:

This property holds the running state of this state machine

This property was introduced in Qt 5.4.

Access functions:

bool	isRunning() const
void	setRunning(bool running)

Notifier signal:

void	runningChanged(bool running)

See also start(), stop(), started(), stopped(), and runningChanged().

pub unsafe fn meta_object(&self) -> Ptr<QMetaObject>

Calls C++ function: virtual const QMetaObject* QStateMachine::metaObject() const.

pub unsafe fn from_q_object( parent: impl CastInto<Ptr<QObject>> ) -> QBox<QStateMachine>

Constructs a new state machine with the given parent.

Calls C++ function: [constructor] void QStateMachine::QStateMachine(QObject* parent = …).

C++ documentation:

Constructs a new state machine with the given parent.

pub unsafe fn from_child_mode_q_object( child_mode: ChildMode, parent: impl CastInto<Ptr<QObject>> ) -> QBox<QStateMachine>

Constructs a new state machine with the given childMode and parent.

Calls C++ function: [constructor] void QStateMachine::QStateMachine(QState::ChildMode childMode, QObject* parent = …).

C++ documentation:

Constructs a new state machine with the given childMode and parent.

This function was introduced in Qt 5.0.

pub unsafe fn new() -> QBox<QStateMachine>

The QStateMachine class provides a hierarchical finite state machine.

Calls C++ function: [constructor] void QStateMachine::QStateMachine().

C++ documentation:

The QStateMachine class provides a hierarchical finite state machine.

QStateMachine is based on the concepts and notation of Statecharts. QStateMachine is part of The State Machine Framework.

A state machine manages a set of states (classes that inherit from QAbstractState) and transitions (descendants of QAbstractTransition) between those states; these states and transitions define a state graph. Once a state graph has been built, the state machine can execute it. QStateMachine's execution algorithm is based on the State Chart XML (SCXML) algorithm. The framework's overview gives several state graphs and the code to build them.

Use the addState() function to add a top-level state to the state machine. States are removed with the removeState() function. Removing states while the machine is running is discouraged.

Before the machine can be started, the initial state must be set. The initial state is the state that the machine enters when started. You can then start() the state machine. The started() signal is emitted when the initial state is entered.

The machine is event driven and keeps its own event loop. Events are posted to the machine through postEvent(). Note that this means that it executes asynchronously, and that it will not progress without a running event loop. You will normally not have to post events to the machine directly as Qt's transitions, e.g., QEventTransition and its subclasses, handle this. But for custom transitions triggered by events, postEvent() is useful.

The state machine processes events and takes transitions until a top-level final state is entered; the state machine then emits the finished() signal. You can also stop() the state machine explicitly. The stopped() signal is emitted in this case.

The following snippet shows a state machine that will finish when a button is clicked:

QPushButton button;
QStateMachine machine;
QState *s1 = new QState();
s1->assignProperty(&button, “text”, “Click me”);
QFinalState *s2 = new QFinalState();
s1->addTransition(&button, SIGNAL(clicked()), s2);
machine.addState(s1);
machine.addState(s2);
machine.setInitialState(s1);
machine.start();

This code example uses QState, which inherits QAbstractState. The QState class provides a state that you can use to set properties and invoke methods on QObjects when the state is entered or exited. It also contains convenience functions for adding transitions, e.g., QSignalTransitions as in this example. See the QState class description for further details.

If an error is encountered, the machine will look for an error state, and if one is available, it will enter this state. The types of errors possible are described by the Error enum. After the error state is entered, the type of the error can be retrieved with error(). The execution of the state graph will not stop when the error state is entered. If no error state applies to the erroneous state, the machine will stop executing and an error message will be printed to the console.

pub unsafe fn from_child_mode(child_mode: ChildMode) -> QBox<QStateMachine>

Constructs a new state machine with the given childMode and parent.

Calls C++ function: [constructor] void QStateMachine::QStateMachine(QState::ChildMode childMode).

C++ documentation:

Constructs a new state machine with the given childMode and parent.

This function was introduced in Qt 5.0.

pub unsafe fn post_delayed_event( &self, event: impl CastInto<Ptr<QEvent>>, delay: c_int ) -> c_int

Posts the given event for processing by this state machine, with the given delay in milliseconds. Returns an identifier associated with the delayed event, or -1 if the event could not be posted.

Calls C++ function: int QStateMachine::postDelayedEvent(QEvent* event, int delay).

C++ documentation:

Posts the given event for processing by this state machine, with the given delay in milliseconds. Returns an identifier associated with the delayed event, or -1 if the event could not be posted.

This function returns immediately. When the delay has expired, the event will be added to the state machine's event queue for processing. The state machine takes ownership of the event and deletes it once it has been processed.

You can only post events when the state machine is running.

Note: This function is thread-safe.

See also cancelDelayedEvent() and postEvent().

pub unsafe fn post_event_2a( &self, event: impl CastInto<Ptr<QEvent>>, priority: EventPriority )

Posts the given event of the given priority for processing by this state machine.

Calls C++ function: void QStateMachine::postEvent(QEvent* event, QStateMachine::EventPriority priority = …).

C++ documentation:

Posts the given event of the given priority for processing by this state machine.

This function returns immediately. The event is added to the state machine's event queue. Events are processed in the order posted. The state machine takes ownership of the event and deletes it once it has been processed.

You can only post events when the state machine is running or when it is starting up.

Note: This function is thread-safe.

See also postDelayedEvent().

pub unsafe fn post_event_1a(&self, event: impl CastInto<Ptr<QEvent>>)

Posts the given event of the given priority for processing by this state machine.

Calls C++ function: void QStateMachine::postEvent(QEvent* event).

C++ documentation:

Posts the given event of the given priority for processing by this state machine.

This function returns immediately. The event is added to the state machine's event queue. Events are processed in the order posted. The state machine takes ownership of the event and deletes it once it has been processed.

You can only post events when the state machine is running or when it is starting up.

Note: This function is thread-safe.

See also postDelayedEvent().

pub unsafe fn qt_metacall( &self, arg1: Call, arg2: c_int, arg3: *mut *mut c_void ) -> c_int

Calls C++ function: virtual int QStateMachine::qt_metacall(QMetaObject::Call arg1, int arg2, void** arg3).

pub unsafe fn qt_metacast(&self, arg1: *const c_char) -> *mut c_void

Calls C++ function: virtual void* QStateMachine::qt_metacast(const char* arg1).

pub unsafe fn remove_default_animation( &self, animation: impl CastInto<Ptr<QAbstractAnimation>> )

Removes animation from the list of default animations.

Calls C++ function: void QStateMachine::removeDefaultAnimation(QAbstractAnimation* animation).

C++ documentation:

Removes animation from the list of default animations.

pub unsafe fn remove_state(&self, state: impl CastInto<Ptr<QAbstractState>>)

Removes the given state from this state machine. The state machine releases ownership of the state.

Calls C++ function: void QStateMachine::removeState(QAbstractState* state).

C++ documentation:

Removes the given state from this state machine. The state machine releases ownership of the state.

See also addState().

pub unsafe fn set_animated(&self, enabled: bool)

Sets whether animations are enabled for this state machine.

Calls C++ function: void QStateMachine::setAnimated(bool enabled).

C++ documentation:

Sets whether animations are enabled for this state machine.

Note: Setter function for property animated.

See also isAnimated().

pub unsafe fn set_global_restore_policy(&self, restore_policy: RestorePolicy)

Sets the restore policy of the state machine to restorePolicy. The default restore policy is QState::DontRestoreProperties.

Calls C++ function: void QStateMachine::setGlobalRestorePolicy(QState::RestorePolicy restorePolicy).

C++ documentation:

Sets the restore policy of the state machine to restorePolicy. The default restore policy is QState::DontRestoreProperties.

Note: Setter function for property globalRestorePolicy.

See also globalRestorePolicy().

pub unsafe fn set_running(&self, running: bool)

This property holds the running state of this state machine

Calls C++ function: [slot] void QStateMachine::setRunning(bool running).

C++ documentation:

This property holds the running state of this state machine

This property was introduced in Qt 5.4.

Access functions:

bool	isRunning() const
void	setRunning(bool running)

Notifier signal:

void	runningChanged(bool running)

See also start(), stop(), started(), stopped(), and runningChanged().

pub unsafe fn start(&self)

Starts this state machine. The machine will reset its configuration and transition to the initial state. When a final top-level state (QFinalState) is entered, the machine will emit the finished() signal.

Calls C++ function: [slot] void QStateMachine::start().

C++ documentation:

Starts this state machine. The machine will reset its configuration and transition to the initial state. When a final top-level state (QFinalState) is entered, the machine will emit the finished() signal.

Note: A state machine will not run without a running event loop, such as the main application event loop started with QCoreApplication::exec() or QApplication::exec().

See also started(), finished(), stop(), initialState(), and setRunning().

pub unsafe fn static_meta_object() -> Ref<QMetaObject>

Returns a reference to the staticMetaObject field.

pub unsafe fn stop(&self)

Stops this state machine. The state machine will stop processing events and then emit the stopped() signal.

Calls C++ function: [slot] void QStateMachine::stop().

C++ documentation:

Stops this state machine. The state machine will stop processing events and then emit the stopped() signal.

See also stopped(), start(), and setRunning().

pub unsafe fn tr( s: *const c_char, c: *const c_char, n: c_int ) -> CppBox<QString>

Calls C++ function: static QString QStateMachine::tr(const char* s, const char* c, int n).

pub unsafe fn tr_utf8( s: *const c_char, c: *const c_char, n: c_int ) -> CppBox<QString>

Calls C++ function: static QString QStateMachine::trUtf8(const char* s, const char* c, int n).

Methods from Deref<Target = QState>

pub fn finished(&self) -> Signal<()>

This signal is emitted when a final child state of this state is entered.

Returns a built-in Qt signal QState::finished that can be passed to qt_core::Signal::connect.

C++ documentation:

This signal is emitted when a final child state of this state is entered.

Note: This is a private signal. It can be used in signal connections but cannot be emitted by the user.

See also QFinalState.

pub fn properties_assigned(&self) -> Signal<()>

This signal is emitted when all properties have been assigned their final value. If the state assigns a value to one or more properties for which an animation exists (either set on the transition or as a default animation on the state machine), then the signal will not be emitted until all such animations have finished playing.

Returns a built-in Qt signal QState::propertiesAssigned that can be passed to qt_core::Signal::connect.

C++ documentation:

This signal is emitted when all properties have been assigned their final value. If the state assigns a value to one or more properties for which an animation exists (either set on the transition or as a default animation on the state machine), then the signal will not be emitted until all such animations have finished playing.

If there are no relevant animations, or no property assignments defined for the state, then the signal will be emitted immediately before the state is entered.

Note: This is a private signal. It can be used in signal connections but cannot be emitted by the user.

See also QState::assignProperty() and QAbstractTransition::addAnimation().

pub fn child_mode_changed(&self) -> Signal<()>

This signal is emitted when the childMode property is changed.

Returns a built-in Qt signal QState::childModeChanged that can be passed to qt_core::Signal::connect.

C++ documentation:

This signal is emitted when the childMode property is changed.

This function was introduced in Qt 5.4.

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 childMode.

See also QState::childMode.

pub fn initial_state_changed(&self) -> Signal<()>

This signal is emitted when the initialState property is changed.

Returns a built-in Qt signal QState::initialStateChanged that can be passed to qt_core::Signal::connect.

C++ documentation:

This signal is emitted when the initialState property is changed.

This function was introduced in Qt 5.4.

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 initialState.

See also QState::initialState.

pub fn error_state_changed(&self) -> Signal<()>

This signal is emitted when the errorState property is changed.

Returns a built-in Qt signal QState::errorStateChanged that can be passed to qt_core::Signal::connect.

C++ documentation:

This signal is emitted when the errorState property is changed.

This function was introduced in Qt 5.4.

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 errorState.

See also QState::errorState.

pub unsafe fn add_transition_q_abstract_transition( &self, transition: impl CastInto<Ptr<QAbstractTransition>> )

Adds the given transition. The transition has this state as the source. This state takes ownership of the transition.

Calls C++ function: void QState::addTransition(QAbstractTransition* transition).

C++ documentation:

Adds the given transition. The transition has this state as the source. This state takes ownership of the transition.

pub unsafe fn add_transition_q_object_char_q_abstract_state( &self, sender: impl CastInto<Ptr<QObject>>, signal: *const c_char, target: impl CastInto<Ptr<QAbstractState>> ) -> QPtr<QSignalTransition>

Adds a transition associated with the given signal of the given sender object, and returns the new QSignalTransition object. The transition has this state as the source, and the given target as the target state.

Calls C++ function: QSignalTransition* QState::addTransition(const QObject* sender, const char* signal, QAbstractState* target).

C++ documentation:

Adds a transition associated with the given signal of the given sender object, and returns the new QSignalTransition object. The transition has this state as the source, and the given target as the target state.

pub unsafe fn add_transition_q_abstract_state( &self, target: impl CastInto<Ptr<QAbstractState>> ) -> QPtr<QAbstractTransition>

Adds an unconditional transition from this state to the given target state, and returns then new transition object.

Calls C++ function: QAbstractTransition* QState::addTransition(QAbstractState* target).

C++ documentation:

Adds an unconditional transition from this state to the given target state, and returns then new transition object.

pub unsafe fn assign_property( &self, object: impl CastInto<Ptr<QObject>>, name: *const c_char, value: impl CastInto<Ref<QVariant>> )

Instructs this state to set the property with the given name of the given object to the given value when the state is entered.

Calls C++ function: void QState::assignProperty(QObject* object, const char* name, const QVariant& value).

C++ documentation:

Instructs this state to set the property with the given name of the given object to the given value when the state is entered.

See also propertiesAssigned().

pub unsafe fn child_mode(&self) -> ChildMode

This property holds the child mode of this state

Calls C++ function: QState::ChildMode QState::childMode() const.

C++ documentation:

This property holds the child mode of this state

The default value of this property is QState::ExclusiveStates.

Access functions:

ChildMode	childMode() const
void	setChildMode(ChildMode mode)

Notifier signal:

void

childModeChanged()

[see note below]

Note: This is a private signal. It can be used in signal connections but cannot be emitted by the user.

pub unsafe fn error_state(&self) -> QPtr<QAbstractState>

This property holds the error state of this state

Calls C++ function: QAbstractState* QState::errorState() const.

C++ documentation:

This property holds the error state of this state

Access functions:

QAbstractState *	errorState() const
void	setErrorState(QAbstractState *state)

Notifier signal:

void

errorStateChanged()

[see note below]

Note: This is a private signal. It can be used in signal connections but cannot be emitted by the user.

pub unsafe fn initial_state(&self) -> QPtr<QAbstractState>

This property holds the initial state of this state (one of its child states)

Calls C++ function: QAbstractState* QState::initialState() const.

C++ documentation:

This property holds the initial state of this state (one of its child states)

Access functions:

QAbstractState *	initialState() const
void	setInitialState(QAbstractState *state)

Notifier signal:

void

initialStateChanged()

[see note below]

Note: This is a private signal. It can be used in signal connections but cannot be emitted by the user.

pub unsafe fn meta_object(&self) -> Ptr<QMetaObject>

Calls C++ function: virtual const QMetaObject* QState::metaObject() const.

pub unsafe fn qt_metacall( &self, arg1: Call, arg2: c_int, arg3: *mut *mut c_void ) -> c_int

Calls C++ function: virtual int QState::qt_metacall(QMetaObject::Call arg1, int arg2, void** arg3).

pub unsafe fn qt_metacast(&self, arg1: *const c_char) -> *mut c_void

Calls C++ function: virtual void* QState::qt_metacast(const char* arg1).

pub unsafe fn remove_transition( &self, transition: impl CastInto<Ptr<QAbstractTransition>> )

Removes the given transition from this state. The state releases ownership of the transition.

Calls C++ function: void QState::removeTransition(QAbstractTransition* transition).

C++ documentation:

Removes the given transition from this state. The state releases ownership of the transition.

See also addTransition().

pub unsafe fn set_child_mode(&self, mode: ChildMode)

Sets the child mode of this state.

Calls C++ function: void QState::setChildMode(QState::ChildMode mode).

C++ documentation:

Sets the child mode of this state.

Note: Setter function for property childMode.

See also childMode().

pub unsafe fn set_error_state(&self, state: impl CastInto<Ptr<QAbstractState>>)

Sets this state's error state to be the given state. If the error state is not set, or if it is set to 0, the state will inherit its parent's error state recursively. If no error state is set for the state itself or any of its ancestors, an error will cause the machine to stop executing and an error will be printed to the console.

Calls C++ function: void QState::setErrorState(QAbstractState* state).

C++ documentation:

Sets this state’s error state to be the given state. If the error state is not set, or if it is set to 0, the state will inherit its parent’s error state recursively. If no error state is set for the state itself or any of its ancestors, an error will cause the machine to stop executing and an error will be printed to the console.

Note: Setter function for property errorState.

See also errorState().

pub unsafe fn set_initial_state( &self, state: impl CastInto<Ptr<QAbstractState>> )

Sets this state's initial state to be the given state. state has to be a child of this state.

Calls C++ function: void QState::setInitialState(QAbstractState* state).

C++ documentation:

Sets this state’s initial state to be the given state. state has to be a child of this state.

Note: Setter function for property initialState.

See also initialState().

pub unsafe fn transitions(&self) -> CppBox<QListOfQAbstractTransition>

Returns this state's outgoing transitions (i.e. transitions where this state is the source state), or an empty list if this state has no outgoing transitions.

Calls C++ function: QList<QAbstractTransition*> QState::transitions() const.

C++ documentation:

Returns this state’s outgoing transitions (i.e. transitions where this state is the source state), or an empty list if this state has no outgoing transitions.

This function was introduced in Qt 4.7.

See also addTransition().

Methods from Deref<Target = QAbstractState>

pub fn entered(&self) -> Signal<()>

This signal is emitted when the state has been entered (after onEntry() has been called).

Returns a built-in Qt signal QAbstractState::entered that can be passed to qt_core::Signal::connect.

C++ documentation:

This signal is emitted when the state has been entered (after onEntry() has been called).

Note: This is a private signal. It can be used in signal connections but cannot be emitted by the user.

pub fn exited(&self) -> Signal<()>

This signal is emitted when the state has been exited (after onExit() has been called).

Returns a built-in Qt signal QAbstractState::exited that can be passed to qt_core::Signal::connect.

C++ documentation:

This signal is emitted when the state has been exited (after onExit() has been called).

Note: This is a private signal. It can be used in signal connections but cannot be emitted by the user.

pub fn active_changed(&self) -> Signal<(bool,)>

This signal is emitted when the active property is changed with active as argument.

Returns a built-in Qt signal QAbstractState::activeChanged that can be passed to qt_core::Signal::connect.

C++ documentation:

This signal is emitted when the active property is changed with active as argument.

This function was introduced in Qt 5.4.

Note: Notifier signal for property active.

See also QAbstractState::active, entered(), and exited().

pub unsafe fn active(&self) -> bool

This property holds the active property of this state. A state is active between entered() and exited() signals.

Calls C++ function: bool QAbstractState::active() const.

C++ documentation:

This property holds the active property of this state. A state is active between entered() and exited() signals.

This property was introduced in Qt 5.4.

Access functions:

bool	active() const

Notifier signal:

void	activeChanged(bool active)

pub unsafe fn machine(&self) -> QPtr<QStateMachine>

Returns the state machine that this state is part of, or 0 if the state is not part of a state machine.

Calls C++ function: QStateMachine* QAbstractState::machine() const.

C++ documentation:

Returns the state machine that this state is part of, or 0 if the state is not part of a state machine.

pub unsafe fn meta_object(&self) -> Ptr<QMetaObject>

Calls C++ function: virtual const QMetaObject* QAbstractState::metaObject() const.

pub unsafe fn parent_state(&self) -> QPtr<QState>

Returns this state's parent state, or 0 if the state has no parent state.

Calls C++ function: QState* QAbstractState::parentState() const.

C++ documentation:

Returns this state’s parent state, or 0 if the state has no parent state.

pub unsafe fn qt_metacall( &self, arg1: Call, arg2: c_int, arg3: *mut *mut c_void ) -> c_int

Calls C++ function: virtual int QAbstractState::qt_metacall(QMetaObject::Call arg1, int arg2, void** arg3).

pub unsafe fn qt_metacast(&self, arg1: *const c_char) -> *mut c_void

Calls C++ function: virtual void* QAbstractState::qt_metacast(const char* arg1).

Methods from Deref<Target = QObject>

pub unsafe fn find_child<T>( &self, name: &str ) -> Result<QPtr<T>, FindChildError>

where QObject: DynamicCast<T>, T: StaticUpcast<QObject>,

Finds a child of self with the specified object name and casts it to type T.

The search is performed recursively. 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.

Returns an error if there is no child object with object name name or the found object cannot be cast to T.

pub fn destroyed(&self) -> Signal<(*mut QObject,)>

This signal is emitted immediately before the object obj is destroyed, and can not be blocked.

Returns a built-in Qt signal QObject::destroyed that can be passed to qt_core::Signal::connect.

C++ documentation:

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.

pub fn object_name_changed(&self) -> Signal<(*const QString,)>

This signal is emitted after the object's name has been changed. The new object name is passed as objectName.

Returns a built-in Qt signal QObject::objectNameChanged that can be passed to qt_core::Signal::connect.

C++ documentation:

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 QObject::objectName.

pub fn slot_delete_later(&self) -> Receiver<()>

Schedules this object for deletion.

Returns a built-in Qt slot QObject::deleteLater that can be passed to qt_core::Signal::connect.

C++ documentation:

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 QCoreApplication::exec()), 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.

pub unsafe fn block_signals(&self, b: bool) -> bool

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.

Calls C++ function: bool QObject::blockSignals(bool b).

C++ documentation:

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.

pub unsafe fn children(&self) -> Ref<QListOfQObject>

Returns a list of child objects. The QObjectList class is defined in the <QObject> header file as the following:

Calls C++ function: const QList<QObject*>& QObject::children() const.

C++ documentation:

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().

pub unsafe fn delete_later(&self)

Schedules this object for deletion.

Calls C++ function: [slot] void QObject::deleteLater().

C++ documentation:

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 QCoreApplication::exec()), 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.

pub unsafe fn disconnect_char_q_object_char( &self, signal: *const c_char, receiver: impl CastInto<Ptr<QObject>>, member: *const c_char ) -> bool

This function overloads disconnect().

Calls C++ function: bool QObject::disconnect(const char* signal = …, const QObject* receiver = …, const char* member = …) const.

C++ documentation:

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.

pub unsafe fn disconnect_q_object_char( &self, receiver: impl CastInto<Ptr<QObject>>, member: *const c_char ) -> bool

This function overloads disconnect().

Calls C++ function: bool QObject::disconnect(const QObject* receiver, const char* member = …) const.

C++ documentation:

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.

pub unsafe fn disconnect_char_q_object( &self, signal: *const c_char, receiver: impl CastInto<Ptr<QObject>> ) -> bool

This function overloads disconnect().

Calls C++ function: bool QObject::disconnect(const char* signal = …, const QObject* receiver = …) const.

C++ documentation:

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.

pub unsafe fn disconnect_char(&self, signal: *const c_char) -> bool

This function overloads disconnect().

Calls C++ function: bool QObject::disconnect(const char* signal = …) const.

C++ documentation:

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.

pub unsafe fn disconnect(&self) -> bool

This function overloads disconnect().

Calls C++ function: bool QObject::disconnect() const.

C++ documentation:

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.

pub unsafe fn disconnect_q_object( &self, receiver: impl CastInto<Ptr<QObject>> ) -> bool

This function overloads disconnect().

Calls C++ function: bool QObject::disconnect(const QObject* receiver) const.

C++ documentation:

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.

pub unsafe fn dump_object_info_mut(&self)

Dumps information about signal connections, etc. for this object to the debug output.

Calls C++ function: void QObject::dumpObjectInfo().

C++ documentation:

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().

pub unsafe fn dump_object_info(&self)

Dumps information about signal connections, etc. for this object to the debug output.

Calls C++ function: void QObject::dumpObjectInfo() const.

C++ documentation:

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().

pub unsafe fn dump_object_tree_mut(&self)

Dumps a tree of children to the debug output.

Calls C++ function: void QObject::dumpObjectTree().

C++ documentation:

Dumps a tree of children to the debug output.

Note: before Qt 5.9, this function was not const.

See also dumpObjectInfo().

pub unsafe fn dump_object_tree(&self)

Dumps a tree of children to the debug output.

Calls C++ function: void QObject::dumpObjectTree() const.

C++ documentation:

Dumps a tree of children to the debug output.

Note: before Qt 5.9, this function was not const.

See also dumpObjectInfo().

pub unsafe fn dynamic_property_names(&self) -> CppBox<QListOfQByteArray>

Returns the names of all properties that were dynamically added to the object using setProperty().

Calls C++ function: QList<QByteArray> QObject::dynamicPropertyNames() const.

C++ documentation:

Returns the names of all properties that were dynamically added to the object using setProperty().

This function was introduced in Qt 4.2.

pub unsafe fn eq(&self, p: impl CastInto<Ref<QPointerOfQObject>>) -> bool

Returns true if c1 and c2 are the same Unicode character; otherwise returns false.

Calls C++ function: bool operator==(QObject* o, const QPointer<QObject>& p).

Warning: no exact match found in C++ documentation. Below is the C++ documentation for bool operator==(QChar c1, QChar c2):

Returns true if c1 and c2 are the same Unicode character; otherwise returns false.

pub unsafe fn event(&self, event: impl CastInto<Ptr<QEvent>>) -> bool

This virtual function receives events to an object and should return true if the event e was recognized and processed.

Calls C++ function: virtual bool QObject::event(QEvent* event).

C++ documentation:

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() == QEvent::PolishRequest) {
              // overwrite handling of PolishRequest if any
              doThings();
              return true;
          } else  if (ev->type() == QEvent::Show) {
              // complement handling of Show if any
              doThings2();
              QWidget::event(ev);
              return true;
          }
          // Make sure the rest of events are handled
          return QWidget::event(ev);
      }
};

See also installEventFilter(), timerEvent(), QCoreApplication::sendEvent(), and QCoreApplication::postEvent().

pub unsafe fn event_filter( &self, watched: impl CastInto<Ptr<QObject>>, event: impl CastInto<Ptr<QEvent>> ) -> bool

Filters events if this object has been installed as an event filter for the watched object.

Calls C++ function: virtual bool QObject::eventFilter(QObject* watched, QEvent* event).

C++ documentation:

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;
};
MainWindow::MainWindow()
{
      textEdit = new QTextEdit;
      setCentralWidget(textEdit);
      textEdit->installEventFilter(this);
}
bool MainWindow::eventFilter(QObject obj, QEvent event)
{
      if (obj == textEdit) {
          if (event->type() == QEvent::KeyPress) {
              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 QMainWindow::eventFilter(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().

pub unsafe fn find_child_q_object_2a( &self, a_name: impl CastInto<Ref<QString>>, options: QFlags<FindChildOption> ) -> QPtr<QObject>

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.

Calls C++ function: QObject* QObject::findChild<QObject*>(const QString& aName = …, QFlags<Qt::FindChildOption> options = …) const.

C++ documentation:

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”, Qt::FindDirectChildrenOnly);

This example returns a QListWidget child of parentWidget, its direct parent:

QListWidget list = parentWidget->findChild<QListWidget >(QString(), Qt::FindDirectChildrenOnly);

See also findChildren().

pub unsafe fn find_child_q_object_1a( &self, a_name: impl CastInto<Ref<QString>> ) -> QPtr<QObject>

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.

Calls C++ function: QObject* QObject::findChild<QObject*>(const QString& aName = …) const.

C++ documentation:

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”, Qt::FindDirectChildrenOnly);

This example returns a QListWidget child of parentWidget, its direct parent:

QListWidget list = parentWidget->findChild<QListWidget >(QString(), Qt::FindDirectChildrenOnly);

See also findChildren().

pub unsafe fn find_child_q_object_0a(&self) -> QPtr<QObject>

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.

Calls C++ function: QObject* QObject::findChild<QObject*>() const.

C++ documentation:

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”, Qt::FindDirectChildrenOnly);

This example returns a QListWidget child of parentWidget, its direct parent:

QListWidget list = parentWidget->findChild<QListWidget >(QString(), Qt::FindDirectChildrenOnly);

See also findChildren().

pub unsafe fn find_children_q_object_q_string_q_flags_find_child_option( &self, a_name: impl CastInto<Ref<QString>>, options: QFlags<FindChildOption> ) -> CppBox<QListOfQObject>

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.

Calls C++ function: QList<QObject*> QObject::findChildren<QObject*>(const QString& aName = …, QFlags<Qt::FindChildOption> options = …) const.

C++ documentation:

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(), Qt::FindDirectChildrenOnly);

See also findChild().

pub unsafe fn find_children_q_object_q_reg_exp_q_flags_find_child_option( &self, re: impl CastInto<Ref<QRegExp>>, options: QFlags<FindChildOption> ) -> CppBox<QListOfQObject>

This function overloads findChildren().

Calls C++ function: QList<QObject*> QObject::findChildren<QObject*>(const QRegExp& re, QFlags<Qt::FindChildOption> options = …) const.

C++ documentation:

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.

pub unsafe fn find_children_q_object_q_regular_expression_q_flags_find_child_option( &self, re: impl CastInto<Ref<QRegularExpression>>, options: QFlags<FindChildOption> ) -> CppBox<QListOfQObject>

This function overloads findChildren().

Calls C++ function: QList<QObject*> QObject::findChildren<QObject*>(const QRegularExpression& re, QFlags<Qt::FindChildOption> options = …) const.

C++ documentation:

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.

pub unsafe fn find_children_q_object_q_string( &self, a_name: impl CastInto<Ref<QString>> ) -> CppBox<QListOfQObject>

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.

Calls C++ function: QList<QObject*> QObject::findChildren<QObject*>(const QString& aName = …) const.

C++ documentation:

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(), Qt::FindDirectChildrenOnly);

See also findChild().

pub unsafe fn find_children_q_object(&self) -> CppBox<QListOfQObject>

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.

Calls C++ function: QList<QObject*> QObject::findChildren<QObject*>() const.

C++ documentation:

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(), Qt::FindDirectChildrenOnly);

See also findChild().

pub unsafe fn find_children_q_object_q_reg_exp( &self, re: impl CastInto<Ref<QRegExp>> ) -> CppBox<QListOfQObject>

This function overloads findChildren().

Calls C++ function: QList<QObject*> QObject::findChildren<QObject*>(const QRegExp& re) const.

C++ documentation:

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.

pub unsafe fn find_children_q_object_q_regular_expression( &self, re: impl CastInto<Ref<QRegularExpression>> ) -> CppBox<QListOfQObject>

This function overloads findChildren().

Calls C++ function: QList<QObject*> QObject::findChildren<QObject*>(const QRegularExpression& re) const.

C++ documentation:

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.

pub unsafe fn inherits(&self, classname: *const c_char) -> bool

Returns true if this object is an instance of a class that inherits className or a QObject subclass that inherits className; otherwise returns false.

Calls C++ function: bool QObject::inherits(const char* classname) const.

C++ documentation:

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().

pub unsafe fn install_event_filter( &self, filter_obj: impl CastInto<Ptr<QObject>> )

Installs an event filter filterObj on this object. For example:

Calls C++ function: void QObject::installEventFilter(QObject* filterObj).

C++ documentation:

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 KeyPressEater::eventFilter(QObject obj, QEvent event)
{
      if (event->type() == QEvent::KeyPress) {
          QKeyEvent keyEvent = static_cast<QKeyEvent >(event);
          qDebug(“Ate key press %d”, keyEvent->key());
          return true;
      } else {
          // standard event processing
          return QObject::eventFilter(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().

pub unsafe fn is_widget_type(&self) -> bool

Returns true if the object is a widget; otherwise returns false.

Calls C++ function: bool QObject::isWidgetType() const.

C++ documentation:

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.

pub unsafe fn is_window_type(&self) -> bool

Returns true if the object is a window; otherwise returns false.

Calls C++ function: bool QObject::isWindowType() const.

C++ documentation:

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.

pub unsafe fn kill_timer(&self, id: c_int)

Kills the timer with timer identifier, id.

Calls C++ function: void QObject::killTimer(int id).

C++ documentation:

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().

pub unsafe fn meta_object(&self) -> Ptr<QMetaObject>

Returns a pointer to the meta-object of this object.

Calls C++ function: virtual const QMetaObject* QObject::metaObject() const.

C++ documentation:

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”
QPushButton::staticMetaObject.className();  // returns “QPushButton”

See also staticMetaObject.

pub unsafe fn move_to_thread(&self, thread: impl CastInto<Ptr<QThread>>)

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.

Calls C++ function: void QObject::moveToThread(QThread* thread).

C++ documentation:

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 QApplication::instance() to retrieve a pointer to the current application, and then use QApplication::thread() to retrieve the thread in which the application lives. For example:

myObject->moveToThread(QApplication::instance()->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 QEvent::ThreadChange 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().

pub unsafe fn object_name(&self) -> CppBox<QString>

This property holds the name of this object

Calls C++ function: QString QObject::objectName() const.

C++ documentation:

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(“MyClass::setPrecision(): (%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 QMetaObject::className().

pub unsafe fn parent(&self) -> QPtr<QObject>

Returns a pointer to the parent object.

Calls C++ function: QObject* QObject::parent() const.

C++ documentation:

Returns a pointer to the parent object.

See also setParent() and children().

pub unsafe fn property(&self, name: *const c_char) -> CppBox<QVariant>

Returns the value of the object's name property.

Calls C++ function: QVariant QObject::property(const char* name) const.

C++ documentation:

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(), QVariant::isValid(), metaObject(), and dynamicPropertyNames().

pub unsafe fn qt_metacall( &self, arg1: Call, arg2: c_int, arg3: *mut *mut c_void ) -> c_int

Calls C++ function: virtual int QObject::qt_metacall(QMetaObject::Call arg1, int arg2, void** arg3).

pub unsafe fn qt_metacast(&self, arg1: *const c_char) -> *mut c_void

Calls C++ function: virtual void* QObject::qt_metacast(const char* arg1).

pub unsafe fn remove_event_filter(&self, obj: impl CastInto<Ptr<QObject>>)

Removes an event filter object obj from this object. The request is ignored if such an event filter has not been installed.

Calls C++ function: void QObject::removeEventFilter(QObject* obj).

C++ documentation:

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().

pub unsafe fn set_object_name(&self, name: impl CastInto<Ref<QString>>)

This property holds the name of this object

Calls C++ function: void QObject::setObjectName(const QString& name).

C++ documentation:

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(“MyClass::setPrecision(): (%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 QMetaObject::className().

pub unsafe fn set_parent(&self, parent: impl CastInto<Ptr<QObject>>)

Makes the object a child of parent.

Calls C++ function: void QObject::setParent(QObject* parent).

C++ documentation:

Makes the object a child of parent.

See also parent() and children().

pub unsafe fn set_property( &self, name: *const c_char, value: impl CastInto<Ref<QVariant>> ) -> bool

Sets the value of the object's name property to value.

Calls C++ function: bool QObject::setProperty(const char* name, const QVariant& value).

C++ documentation:

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 QMetaProperty::write().

pub unsafe fn signals_blocked(&self) -> bool

Returns true if signals are blocked; otherwise returns false.

Calls C++ function: bool QObject::signalsBlocked() const.

C++ documentation:

Returns true if signals are blocked; otherwise returns false.

Signals are not blocked by default.

See also blockSignals() and QSignalBlocker.

pub unsafe fn start_timer_2a( &self, interval: c_int, timer_type: TimerType ) -> c_int

Starts a timer and returns a timer identifier, or returns zero if it could not start a timer.

Calls C++ function: int QObject::startTimer(int interval, Qt::TimerType timerType = …).

C++ documentation:

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 QTimerEvent::timerId() 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);
};
MyObject::MyObject(QObject *parent)
      : QObject(parent)
{
      startTimer(50);     // 50-millisecond timer
      startTimer(1000);   // 1-second timer
      startTimer(60000);  // 1-minute timer
      using namespace std::chrono;
      startTimer(milliseconds(50));
      startTimer(seconds(1));
      startTimer(minutes(1));
      // since C++14 we can use std::chrono::duration literals, e.g.:
      startTimer(100ms);
      startTimer(5s);
      startTimer(2min);
      startTimer(1h);
}
void MyObject::timerEvent(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 Qt::TimerType for information on the different timer types. Most platforms support an accuracy of 20 milliseconds; some provide more. If Qt is unable to deliver the requested number of timer events, it will silently discard some.

The QTimer class provides a high-level programming interface with single-shot timers and timer signals instead of events. There is also a QBasicTimer class that is more lightweight than QTimer and less clumsy than using timer IDs directly.

See also timerEvent(), killTimer(), and QTimer::singleShot().

pub unsafe fn start_timer_1a(&self, interval: c_int) -> c_int

Starts a timer and returns a timer identifier, or returns zero if it could not start a timer.

Calls C++ function: int QObject::startTimer(int interval).

C++ documentation:

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 QTimerEvent::timerId() 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);
};
MyObject::MyObject(QObject *parent)
      : QObject(parent)
{
      startTimer(50);     // 50-millisecond timer
      startTimer(1000);   // 1-second timer
      startTimer(60000);  // 1-minute timer
      using namespace std::chrono;
      startTimer(milliseconds(50));
      startTimer(seconds(1));
      startTimer(minutes(1));
      // since C++14 we can use std::chrono::duration literals, e.g.:
      startTimer(100ms);
      startTimer(5s);
      startTimer(2min);
      startTimer(1h);
}
void MyObject::timerEvent(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 Qt::TimerType for information on the different timer types. Most platforms support an accuracy of 20 milliseconds; some provide more. If Qt is unable to deliver the requested number of timer events, it will silently discard some.

The QTimer class provides a high-level programming interface with single-shot timers and timer signals instead of events. There is also a QBasicTimer class that is more lightweight than QTimer and less clumsy than using timer IDs directly.

See also timerEvent(), killTimer(), and QTimer::singleShot().

pub unsafe fn thread(&self) -> QPtr<QThread>

Returns the thread in which the object lives.

Calls C++ function: QThread* QObject::thread() const.

C++ documentation:

Returns the thread in which the object lives.

See also moveToThread().

Trait Implementations

impl CppDeletable for QStateMachine

unsafe fn delete(&self)

Destroys this state machine.

Calls C++ function: virtual [destructor] void QStateMachine::~QStateMachine().

C++ documentation:

Destroys this state machine.

impl Deref for QStateMachine

fn deref(&self) -> &QState

Calls C++ function: QState* static_cast<QState*>(QStateMachine* ptr).

type Target = QState

The resulting type after dereferencing.

impl DynamicCast<QStateMachine> for QAbstractState

unsafe fn dynamic_cast(ptr: Ptr<QAbstractState>) -> Ptr<QStateMachine>

Calls C++ function: QStateMachine* dynamic_cast<QStateMachine*>(QAbstractState* ptr).

impl DynamicCast<QStateMachine> for QObject

unsafe fn dynamic_cast(ptr: Ptr<QObject>) -> Ptr<QStateMachine>

Calls C++ function: QStateMachine* dynamic_cast<QStateMachine*>(QObject* ptr).

impl DynamicCast<QStateMachine> for QState

unsafe fn dynamic_cast(ptr: Ptr<QState>) -> Ptr<QStateMachine>

Calls C++ function: QStateMachine* dynamic_cast<QStateMachine*>(QState* ptr).

impl StaticDowncast<QStateMachine> for QAbstractState

unsafe fn static_downcast(ptr: Ptr<QAbstractState>) -> Ptr<QStateMachine>

Calls C++ function: QStateMachine* static_cast<QStateMachine*>(QAbstractState* ptr).

impl StaticDowncast<QStateMachine> for QObject

unsafe fn static_downcast(ptr: Ptr<QObject>) -> Ptr<QStateMachine>

Calls C++ function: QStateMachine* static_cast<QStateMachine*>(QObject* ptr).

impl StaticDowncast<QStateMachine> for QState

unsafe fn static_downcast(ptr: Ptr<QState>) -> Ptr<QStateMachine>

Calls C++ function: QStateMachine* static_cast<QStateMachine*>(QState* ptr).

impl StaticUpcast<QAbstractState> for QStateMachine

unsafe fn static_upcast(ptr: Ptr<QStateMachine>) -> Ptr<QAbstractState>

Calls C++ function: QAbstractState* static_cast<QAbstractState*>(QStateMachine* ptr).

impl StaticUpcast<QObject> for QStateMachine

unsafe fn static_upcast(ptr: Ptr<QStateMachine>) -> Ptr<QObject>

Calls C++ function: QObject* static_cast<QObject*>(QStateMachine* ptr).

impl StaticUpcast<QState> for QStateMachine

unsafe fn static_upcast(ptr: Ptr<QStateMachine>) -> Ptr<QState>

Calls C++ function: QState* static_cast<QState*>(QStateMachine* ptr).