QEventTransition Class

The QEventTransition class provides a QObject-specific transition for Qt events. More...

Header: #include <QEventTransition>
CMake: find_package(Qt6 REQUIRED COMPONENTS StateMachine)
target_link_libraries(mytarget PRIVATE Qt6::StateMachine)
qmake: QT += statemachine
Inherits: QAbstractTransition
Inherited By:

QKeyEventTransition and QMouseEventTransition

Properties

Public Functions

QEventTransition(QState *sourceState = nullptr)
QEventTransition(QObject *object, QEvent::Type type, QState *sourceState = nullptr)
virtual ~QEventTransition()
QBindable<QObject *> bindableEventSource()
QBindable<QEvent::Type> bindableEventType()
QObject *eventSource() const
QEvent::Type eventType() const
void setEventSource(QObject *object)
void setEventType(QEvent::Type type)

Reimplemented Protected Functions

virtual bool event(QEvent *e) override
virtual bool eventTest(QEvent *event) override
virtual void onTransition(QEvent *event) override

Detailed Description

A QEventTransition object binds an event to a particular QObject. QEventTransition is part of Qt State Machine Framework.

Example:

QPushButton *button = ...;
QState *s1 = ...;
QState *s2 = ...;
// If in s1 and the button receives an Enter event, transition to s2
QEventTransition *enterTransition = new QEventTransition(button, QEvent::Enter);
enterTransition->setTargetState(s2);
s1->addTransition(enterTransition);
// If in s2 and the button receives an Exit event, transition back to s1
QEventTransition *leaveTransition = new QEventTransition(button, QEvent::Leave);
leaveTransition->setTargetState(s1);
s2->addTransition(leaveTransition);

Subclassing

When reimplementing the eventTest() function, you should first call the base implementation to verify that the event is a QStateMachine::WrappedEvent for the proper object and event type. You may then cast the event to a QStateMachine::WrappedEvent and get the original event by calling QStateMachine::WrappedEvent::event(), and perform additional checks on that object.

See also QState::addTransition().

Property Documentation

[bindable] eventSource : QObject*

Note: This property supports QProperty bindings.

This property holds the event source that this event transition is associated with

[bindable] eventType : QEvent::Type

Note: This property supports QProperty bindings.

This property holds the type of event that this event transition is associated with

Member Function Documentation

QEventTransition::QEventTransition(QState *sourceState = nullptr)

Constructs a new QEventTransition object with the given sourceState.

QEventTransition::QEventTransition(QObject *object, QEvent::Type type, QState *sourceState = nullptr)

Constructs a new QEventTransition object associated with events of the given type for the given object, and with the given sourceState.

[virtual noexcept] QEventTransition::~QEventTransition()

Destroys this QObject event transition.

[override virtual protected] bool QEventTransition::event(QEvent *e)

Reimplements: QAbstractTransition::event(QEvent *e).

QObject *QEventTransition::eventSource() const

Returns the event source associated with this event transition.

Note: Getter function for property eventSource.

See also setEventSource().

[override virtual protected] bool QEventTransition::eventTest(QEvent *event)

Reimplements: QAbstractTransition::eventTest(QEvent *event).

QEvent::Type QEventTransition::eventType() const

Returns the event type that this event transition is associated with.

Note: Getter function for property eventType.

See also setEventType().

[override virtual protected] void QEventTransition::onTransition(QEvent *event)

Reimplements: QAbstractTransition::onTransition(QEvent *event).

void QEventTransition::setEventSource(QObject *object)

Sets the event source associated with this event transition to be the given object.

Note: Setter function for property eventSource.

See also eventSource().

void QEventTransition::setEventType(QEvent::Type type)

Sets the event type that this event transition is associated with.

Note: Setter function for property eventType.

See also eventType().

© 2024 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.