#include <qquickstate_p.h>

Inheritance diagram for QQuickState:

Collaboration diagram for QQuickState:

Signals
void	completed ()

Signals inherited from QObject
void	destroyed (QObject *=nullptr)
	This signal is emitted immediately before the object obj is destroyed, after any instances of QPointer have been notified, and cannot be blocked.

void	objectNameChanged (const QString &objectName, QPrivateSignal)
	This signal is emitted after the object's name has been changed.

Public Member Functions
	QQuickState (QObject *parent=nullptr)
	\qmltype State \instantiates QQuickState \inqmlmodule QtQuick

	~QQuickState () override

QString	name () const
	\qmlproperty string QtQuick::State::name This property holds the name of the state.

void	setName (const QString &)

bool	isNamed () const

bool	isWhenKnown () const

bool	when () const

void	setWhen (bool)

QString	extends () const
	\qmlproperty string QtQuick::State::extend This property holds the state that this state extends.

void	setExtends (const QString &)

QQmlListProperty< QQuickStateOperation >	changes ()

int	operationCount () const

QQuickStateOperation *	operationAt (int) const

QQuickState &	operator<< (QQuickStateOperation *)

void	apply (QQuickTransition , QQuickState revert)

void	cancel ()

QQuickStateGroup *	stateGroup () const

void	setStateGroup (QQuickStateGroup *)

bool	containsPropertyInRevertList (QObject *target, const QString &name) const

bool	changeValueInRevertList (QObject *target, const QString &name, const QVariant &revertValue)

bool	changeBindingInRevertList (QObject *target, const QString &name, QQmlAnyBinding binding)

bool	removeEntryFromRevertList (QObject *target, const QString &name)

void	addEntryToRevertList (const QQuickStateAction &action)

void	removeAllEntriesFromRevertList (QObject *target)

void	addEntriesToRevertList (const QList< QQuickStateAction > &actions)

QVariant	valueInRevertList (QObject *target, const QString &name) const

QQmlAnyBinding	bindingInRevertList (QObject *target, const QString &name) const

bool	isStateActive () const

Public Member Functions inherited from QObject
Q_INVOKABLE	QObject (QObject *parent=nullptr)
	Constructs an object with parent object parent.

virtual	~QObject ()
	Destroys the object, deleting all its child objects.

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

virtual bool	eventFilter (QObject watched, QEvent event)
	Filters events if this object has been installed as an event filter for the watched object.

QString	objectName () const

Q_WEAK_OVERLOAD void	setObjectName (const QString &name)
	Sets the object's name to name.

void	setObjectName (QAnyStringView name)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

QBindable< QString >	bindableObjectName ()

bool	isWidgetType () const
	Returns `true` if the object is a widget; otherwise returns `false`.

bool	isWindowType () const
	Returns `true` if the object is a window; otherwise returns `false`.

bool	isQuickItemType () const
	Returns `true` if the object is a QQuickItem; otherwise returns `false`.

bool	signalsBlocked () const noexcept
	Returns `true` if signals are blocked; otherwise returns `false`.

bool	blockSignals (bool b) noexcept
	If block is true, signals emitted by this object are blocked (i.e., emitting a signal will not invoke anything connected to it).

QThread *	thread () const
	Returns the thread in which the object lives.

void	moveToThread (QThread *thread)
	Changes the thread affinity for this object and its children.

int	startTimer (int interval, Qt::TimerType timerType=Qt::CoarseTimer)
	This is an overloaded function that will start a timer of type timerType and a timeout of interval milliseconds.

int	startTimer (std::chrono::milliseconds time, Qt::TimerType timerType=Qt::CoarseTimer)

void	killTimer (int id)
	Kills the timer with timer identifier, id.

template<typename T >
T	findChild (const QString &aName=QString(), Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
	Returns the child of this object that can be cast into type T and that is called name, or \nullptr if there is no such object.

template<typename T >
QList< T >	findChildren (const QString &aName, Qt::FindChildOptions options=Qt::FindChildrenRecursively) 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.

template<typename T >
QList< T >	findChildren (Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

const QObjectList &	children () const
	Returns a list of child objects.

void	setParent (QObject *parent)
	Makes the object a child of parent.

void	installEventFilter (QObject *filterObj)
	Installs an event filter filterObj on this object.

void	removeEventFilter (QObject *obj)
	Removes an event filter object obj from this object.

QMetaObject::Connection	connect (const QObject sender, const char signal, const char *member, Qt::ConnectionType type=Qt::AutoConnection) const

bool	disconnect (const char signal=nullptr, const QObject receiver=nullptr, const char *member=nullptr) const

bool	disconnect (const QObject receiver, const char member=nullptr) const

void	dumpObjectTree () const
	Dumps a tree of children to the debug output.

void	dumpObjectInfo () const
	Dumps information about signal connections, etc.

bool	setProperty (const char *name, const QVariant &value)
	Sets the value of the object's name property to value.

bool	setProperty (const char *name, QVariant &&value)

QVariant	property (const char *name) const
	Returns the value of the object's name property.

QList< QByteArray >	dynamicPropertyNames () const

QBindingStorage *	bindingStorage ()

const QBindingStorage *	bindingStorage () const

QObject *	parent () const
	Returns a pointer to the parent object.

bool	inherits (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`.

Properties
QString	name

bool	when

QString	extend

QQmlListProperty< QQuickStateOperation >	changes
	\qmlproperty list<Change> QtQuick::State::changes This property holds the changes to apply for this state \qmldefault

Properties inherited from QObject
QString	objectName
	the name of this object

Additional Inherited Members
Public Slots inherited from QObject
void	deleteLater ()
	\threadsafe

Static Public Member Functions inherited from QObject
static QMetaObject::Connection	connect (const QObject sender, const char signal, const QObject receiver, const char member, Qt::ConnectionType=Qt::AutoConnection)
	\threadsafe

static QMetaObject::Connection	connect (const QObject sender, const QMetaMethod &signal, const QObject receiver, const QMetaMethod &method, Qt::ConnectionType type=Qt::AutoConnection)

template<typename Func1 , typename Func2 >
static QMetaObject::Connection	connect (const typename QtPrivate::FunctionPointer< Func1 >::Object sender, Func1 signal, const typename QtPrivate::ContextTypeForFunctor< Func2 >::ContextType context, Func2 &&slot, Qt::ConnectionType type=Qt::AutoConnection)

template<typename Func1 , typename Func2 >
static QMetaObject::Connection	connect (const typename QtPrivate::FunctionPointer< Func1 >::Object *sender, Func1 signal, Func2 &&slot)

static bool	disconnect (const QObject sender, const char signal, const QObject receiver, const char member)
	\threadsafe

static bool	disconnect (const QObject sender, const QMetaMethod &signal, const QObject receiver, const QMetaMethod &member)

static bool	disconnect (const QMetaObject::Connection &)
	Disconnect a connection.

template<typename Func1 , typename Func2 >
static bool	disconnect (const typename QtPrivate::FunctionPointer< Func1 >::Object sender, Func1 signal, const typename QtPrivate::FunctionPointer< Func2 >::Object receiver, Func2 slot)

template<typename Func1 >
static bool	disconnect (const typename QtPrivate::FunctionPointer< Func1 >::Object sender, Func1 signal, const QObject receiver, void **zero)

Protected Member Functions inherited from QObject
QObject *	sender () const
	Returns a pointer to the object that sent the signal, if called in a slot activated by a signal; otherwise it returns \nullptr.

int	senderSignalIndex () const

int	receivers (const char *signal) const
	Returns the number of receivers connected to the signal.

bool	isSignalConnected (const QMetaMethod &signal) const

virtual void	timerEvent (QTimerEvent *event)
	This event handler can be reimplemented in a subclass to receive timer events for the object.

virtual void	childEvent (QChildEvent *event)
	This event handler can be reimplemented in a subclass to receive child events.

virtual void	customEvent (QEvent *event)
	This event handler can be reimplemented in a subclass to receive custom events.

virtual void	connectNotify (const QMetaMethod &signal)

virtual void	disconnectNotify (const QMetaMethod &signal)

	QObject (QObjectPrivate &dd, QObject *parent=nullptr)

Protected Attributes inherited from QObject
QScopedPointer< QObjectData >	d_ptr

Related Symbols inherited from QObject
template< class T > T	qobject_cast (const QObject *object)
	Returns the given object cast to type T if the object is of type T (or of a subclass); otherwise returns \nullptr.

template< typename T > T	qFindChildqFindChildren (const QObject *obj, const QString &name)()

template< typename T > QList< T >	qFindChildrenqFindChildren (const QObject *obj, const QString &name)()

	QObjectList
	\macro Q_CLASSINFO(Name, Value)

Detailed Description

Definition at line 119 of file qquickstate_p.h.

Constructor & Destructor Documentation

◆ QQuickState()

QQuickState::QQuickState ( QObject * parent = nullptr )

\qmltype State \instantiates QQuickState \inqmlmodule QtQuick

Defines configurations of objects and properties.

A state is a set of batched changes from the default configuration.

All items have a default state that defines the default configuration of objects and property values. New states can be defined by adding State items to the \l {Item::states}{states} property to allow items to switch between different configurations. These configurations can, for example, be used to apply different sets of property values or execute different scripts.

The following example displays a single \l Rectangle. In the default state, the rectangle is colored black. In the "clicked" state, a PropertyChanges object changes the rectangle's color to red. Clicking within the MouseArea toggles the rectangle's state between the default state and the "clicked" state, thus toggling the color of the rectangle between black and red.

import QtQuick
 
Rectangle {
    id: myRect
    width: 100; height: 100
    color: "black"
 
    MouseArea {
        id: mouseArea
        anchors.fill: parent
        onClicked: myRect.state == 'clicked' ? myRect.state = "" : myRect.state = 'clicked';
    }
 
    states: [
        State {
            name: "clicked"
            PropertyChanges { target: myRect; color: "red" }
        }
    ]
}

Notice the default state is referred to using an empty string ("").

States are commonly used together with \l{Animation and Transitions in Qt Quick}{Transitions} to provide animations when state changes occur.

Note: Setting the state of an object from within another state of the same object is not allowed.

See also: {Qt Quick Examples - Animation::States}{States example}, {Qt Quick States}, {Animation and Transitions in Qt Quick}{Transitions}, {Qt QML}

Definition at line 117 of file qquickstate.cpp.

References d.

◆ ~QQuickState()

QQuickState::~QQuickState ( )

override

Definition at line 124 of file qquickstate.cpp.

References d.

Member Function Documentation

◆ addEntriesToRevertList()

void QQuickState::addEntriesToRevertList ( const QList< QQuickStateAction > & actions )

Definition at line 445 of file qquickstate.cpp.

References QList< T >::append(), d, isStateActive(), QList< T >::reserve(), and QList< T >::size().

Referenced by QQuickPropertyChanges::attachToState().

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◆ addEntryToRevertList()

void QQuickState::addEntryToRevertList ( const QQuickStateAction & action )

Definition at line 411 of file qquickstate.cpp.

References d.

Referenced by QQuickPropertyChanges::changeExpression(), and QQuickPropertyChanges::changeValue().

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◆ apply()

void QQuickState::apply	(	QQuickTransition *	trans,
		QQuickState *	revert
	)

Definition at line 498 of file qquickstate.cpp.

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◆ bindingInRevertList()

QQmlAnyBinding QQuickState::bindingInRevertList	(	QObject *	target,
		const QString &	name
	)		const

Definition at line 479 of file qquickstate.cpp.

References d, isStateActive(), and name.

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◆ cancel()

void QQuickState::cancel ( )

Definition at line 324 of file qquickstate.cpp.

References d.

Referenced by apply().

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◆ changeBindingInRevertList()

bool QQuickState::changeBindingInRevertList	(	QObject *	target,
		const QString &	name,
		QQmlAnyBinding	binding
	)

Definition at line 370 of file qquickstate.cpp.

References d, isStateActive(), and name.

Referenced by QQuickPropertyChanges::changeExpression().

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◆ changes()

QQmlListProperty< QQuickStateOperation > QQuickState::changes ( )

◆ changeValueInRevertList()

bool QQuickState::changeValueInRevertList	(	QObject *	target,
		const QString &	name,
		const QVariant &	revertValue
	)

Definition at line 354 of file qquickstate.cpp.

References d, isStateActive(), and name.

Referenced by QQuickDesignerSupportStates::changeValueInRevertList(), and QQuickDesignerSupportStates::updateStateBinding().

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◆ completed

void QQuickState::completed ( )

signal

◆ containsPropertyInRevertList()

bool QQuickState::containsPropertyInRevertList	(	QObject *	target,
		const QString &	name
	)		const

Definition at line 340 of file qquickstate.cpp.

References d, isStateActive(), and name.

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◆ extends()

QString QQuickState::extends ( ) const

\qmlproperty string QtQuick::State::extend This property holds the state that this state extends.

When a state extends another state, it inherits all the changes of that state.

The state being extended is treated as the base state in regards to the changes specified by the extending state.

Definition at line 210 of file qquickstate.cpp.

References d.

Referenced by setExtends().

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◆ isNamed()

bool QQuickState::isNamed ( ) const

Definition at line 150 of file qquickstate.cpp.

References d.

◆ isStateActive()

bool QQuickState::isStateActive ( ) const

Definition at line 493 of file qquickstate.cpp.

References name, QQuickStateGroup::state, and stateGroup().

Referenced by addEntriesToRevertList(), bindingInRevertList(), changeBindingInRevertList(), QQuickPropertyChanges::changeExpression(), QQuickPropertyChanges::changeValue(), changeValueInRevertList(), containsPropertyInRevertList(), removeAllEntriesFromRevertList(), removeEntryFromRevertList(), and valueInRevertList().

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◆ isWhenKnown()

bool QQuickState::isWhenKnown ( ) const

Definition at line 156 of file qquickstate.cpp.

References d.

◆ name()

QString QQuickState::name ( ) const

\qmlproperty string QtQuick::State::name This property holds the name of the state.

Each state should have a unique name within its item.

Definition at line 137 of file qquickstate.cpp.

References d.

◆ operationAt()

QQuickStateOperation * QQuickState::operationAt ( int index ) const

Definition at line 249 of file qquickstate.cpp.

References d.

◆ operationCount()

int QQuickState::operationCount ( ) const

Definition at line 243 of file qquickstate.cpp.

References d.

◆ operator<<()

QQuickState & QQuickState::operator<< ( QQuickStateOperation * op )

Definition at line 255 of file qquickstate.cpp.

References d.

◆ removeAllEntriesFromRevertList()

void QQuickState::removeAllEntriesFromRevertList ( QObject * target )

Definition at line 420 of file qquickstate.cpp.

References d, isStateActive(), QQmlProperty::property(), and QQmlPropertyPrivate::removeBinding().

Referenced by QQuickPropertyChanges::detachFromState().

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◆ removeEntryFromRevertList()

bool QQuickState::removeEntryFromRevertList	(	QObject *	target,
		const QString &	name
	)

Definition at line 386 of file qquickstate.cpp.

References QQuickSimpleAction::binding(), d, isStateActive(), it, QQmlProperty::name, name, QQmlProperty::object, QQuickSimpleAction::property(), QQmlPropertyPrivate::removeBinding(), QQuickSimpleAction::value(), and QQmlProperty::write().

Referenced by QQuickPropertyChanges::removeProperty(), and QQuickDesignerSupportStates::resetStateProperty().

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◆ setExtends()

void QQuickState::setExtends ( const QString & extends )

Definition at line 216 of file qquickstate.cpp.

References d, and extends().

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◆ setName()

void QQuickState::setName ( const QString & n )

Definition at line 143 of file qquickstate.cpp.

References d.

◆ setStateGroup()

void QQuickState::setStateGroup ( QQuickStateGroup * group )

Definition at line 318 of file qquickstate.cpp.

References d.

Referenced by QQuickStateGroupPrivate::setCurrentStateInternal().

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◆ setWhen()

void QQuickState::setWhen ( bool when )

Definition at line 192 of file qquickstate.cpp.

References d, and when.

◆ stateGroup()

QQuickStateGroup * QQuickState::stateGroup ( ) const

Definition at line 312 of file qquickstate.cpp.

References d.

Referenced by QQuickDesignerSupportStates::activateState(), QQuickDesignerSupportStates::deactivateState(), isStateActive(), and QQuickDesignerSupportStates::isStateActive().

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◆ valueInRevertList()

QVariant QQuickState::valueInRevertList	(	QObject *	target,
		const QString &	name
	)		const

Definition at line 465 of file qquickstate.cpp.

References d, isStateActive(), and name.

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◆ when()

bool QQuickState::when ( ) const

\qmlproperty bool QtQuick::State::when
This property holds when the state should be applied.

This should be set to an expression that evaluates to \c true when you want the state to
be applied. For example, the following \l Rectangle changes in and out of the "hidden"
state when the \l MouseArea is pressed:

\snippet qml/state-when.qml 0

If multiple states in a group have \c when clauses that evaluate to \c true
at the same time, the first matching state will be applied. For example, in
the following snippet \c state1 will always be selected rather than
\c state2 when sharedCondition becomes \c true.
\qml
Item {
    states: [
        State { name: "state1"; when: sharedCondition },
        State { name: "state2"; when: sharedCondition }
    ]

... } \endqml

Definition at line 186 of file qquickstate.cpp.

References d.

Property Documentation

◆ changes

QQmlListProperty< QQuickStateOperation > QQuickState::changes

read

\qmlproperty list<Change> QtQuick::State::changes This property holds the changes to apply for this state \qmldefault

By default these changes are applied against the default state. If the state extends another state, then the changes are applied against the state being extended.

Definition at line 108 of file qquickstate_p.h.

◆ extend

QString QQuickState::extend

readwrite

Definition at line 108 of file qquickstate_p.h.

◆ name

QString QQuickState::name

readwrite

Definition at line 108 of file qquickstate_p.h.

Referenced by bindingInRevertList(), changeBindingInRevertList(), changeValueInRevertList(), containsPropertyInRevertList(), isStateActive(), removeEntryFromRevertList(), and valueInRevertList().

◆ when

bool QQuickState::when

readwrite

Definition at line 108 of file qquickstate_p.h.

Referenced by setWhen().

The documentation for this class was generated from the following files:

qtdeclarative/src/quick/util/qquickstate_p.h
qtdeclarative/src/quick/util/qquickstate.cpp

Signals

Public Member Functions

Properties

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ QQuickState()

◆ ~QQuickState()

Member Function Documentation

◆ addEntriesToRevertList()

◆ addEntryToRevertList()

◆ apply()

◆ bindingInRevertList()

◆ cancel()

◆ changeBindingInRevertList()

◆ changes()

◆ changeValueInRevertList()

◆ completed

◆ containsPropertyInRevertList()

◆ extends()

◆ isNamed()

◆ isStateActive()

◆ isWhenKnown()

◆ name()

◆ operationAt()

◆ operationCount()

◆ operator<<()

◆ removeAllEntriesFromRevertList()

◆ removeEntryFromRevertList()

◆ setExtends()

◆ setName()

◆ setStateGroup()

◆ setWhen()

◆ stateGroup()

◆ valueInRevertList()

◆ when()

Property Documentation

◆ changes

◆ extend

◆ name

◆ when