What's New in Qt 6.0

Build System Changes in Qt 6

Building Qt from sources now requires CMake and Ninja. See Build System Changes in Qt 6 for more details on this and other changes in configure.

Changes to Supported Modules

Qt 6.0 is streamlined compared to Qt 5 and some modules are no longer in the default installation of Qt 6.0. Because of the modularized structure of Qt, new modules or previous Qt 5 modules may appear in future releases of Qt 6. For more information, visit the All Modules page.

The Changes to Qt Modules in Qt 6 has a list of API changes.

New Modules in Qt 6.0

The following are new modules in Qt 6.0.

Removed Modules in Qt 6.0

The following are Qt 5 modules that are not in Qt 6.0. They may be re-introduced in a future release of Qt 6.

ModuleqmakeComments
Qt Android ExtrasandroidextrasSee Changes to Qt Extras Modules
Qt Bluetoothbluetooth
Qt Chartscharts
Qt Data Visualizationdatavisualization
Qt Graphical Effectsonly QML types
Qt Locationlocation
Qt Mac ExtrasmacextrasSee Changes to Qt Extras Modules
Qt Multimediamultimedia
Qt Multimedia Widgetsmultimediawidgets
Qt NFCnfc
Qt Positioningpositioning
Qt Purchasingpurchasing
Qt Quick ExtrasMerged into Qt Quick Controls
Qt Remote Objectsremoteobjects
Qt Scriptqtscript
Qt SCXMLscxml
Qt Script Toolsscripttools
Qt Sensorssensors
Qt Serial Busserialbus
Qt Serial Portserialport
Qt Speechtexttospeech
Qt WebChannelwebchannel
Qt WebEnginewebenginecore
Qt WebSocketswebsockets
Qt WebViewwebview
Qt Windows ExtraswinextrasSee Changes to Qt Extras Modules
Qt X11 Extrasx11extrasSee Changes to Qt Extras Modules
Qt XML Patternsxmlpatterns

New Classes and Functions

The section provides a comprehensive list of all new classes and functions introduced in Qt 6.

New Namespaces

namespace QNativeInterface
namespace QQuickOpenGLUtils

New Classes

New Member Functions

Class QBluetoothDeviceInfo:

QList<QBluetoothUuid> serviceUuids() const

Class QAbstractItemModel:

virtual bool clearItemData(const QModelIndex &index)
virtual void multiData(const QModelIndex &index, QModelRoleDataSpan roleDataSpan) const

Class QAbstractProxyModel:

virtual bool clearItemData(const QModelIndex &index) override

Class QBitArray:

quint32 toUInt32(QSysInfo::Endian endianness, bool *ok) const

Class QByteArray:

int compare(QByteArrayView bv, Qt::CaseSensitivity cs) const
bool contains(QByteArrayView bv) const
qsizetype count(QByteArrayView bv) const
bool endsWith(QByteArrayView bv) const
QByteArray first(qsizetype n) const
qsizetype indexOf(QByteArrayView bv, qsizetype from) const
QByteArray &insert(qsizetype i, QByteArrayView data)
QByteArray last(qsizetype n) const
qsizetype lastIndexOf(QByteArrayView bv, qsizetype from) const
void push_back(QByteArrayView str)
void push_front(QByteArrayView str)
QByteArray &replace(QByteArrayView before, QByteArrayView after)
QByteArray sliced(qsizetype pos, qsizetype n) const
QByteArray sliced(qsizetype pos) const
bool startsWith(QByteArrayView bv) const

Class QChar:

QChar fromUcs2(char16_t c)
R fromUcs4(char32_t c)

Class QDate:

QDate fromString(QStringView string, Qt::DateFormat format)
QDate fromString(QStringView string, QStringView format, QCalendar cal)
QDate fromString(const QString &string, QStringView format, QCalendar cal)

Class QDataStream:

QDataStream &operator<<(char16_t c)
QDataStream &operator<<(char32_t c)
QDataStreamIfHasOStreamOperators<T1, T2> operator<<(QDataStream &out, const std::pair<T1, T2> &pair)
QDataStream &operator>>(char16_t &c)
QDataStream &operator>>(char32_t &c)
QDataStreamIfHasIStreamOperators<T1, T2> operator>>(QDataStream &in, std::pair<T1, T2> &pair)

Class QDateTime:

QDateTime fromString(QStringView string, Qt::DateFormat format)
QDateTime fromString(QStringView string, QStringView format, QCalendar cal)
QDateTime fromString(const QString &string, QStringView format, QCalendar cal)

Class QDebug:

QDebug &operator<<(const char16_t *t)
QDebug &operator<<(QUtf8StringView s)
QDebug &operator<<(QByteArrayView t)
QString toString(T &&object)

Class QDir:

void addSearchPath(const QString &prefix, const std::filesystem::path &path)
std::filesystem::path filesystemAbsolutePath() const
std::filesystem::path filesystemCanonicalPath() const
std::filesystem::path filesystemPath() const
void setPath(const std::filesystem::path &path)

Class QEvent:

virtual QEvent *clone() const
bool isInputEvent() const
bool isPointerEvent() const
bool isSinglePointEvent() const

Class QExplicitlySharedDataPointer:

T *get() const
void reset(T *ptr)

Class QFile:

bool copy(const std::filesystem::path &newName)
std::filesystem::path filesystemFileName() const
bool link(const std::filesystem::path &newName)
QFileDevice::Permissions permissions(const std::filesystem::path &filename)
bool rename(const std::filesystem::path &newName)
void setFileName(const std::filesystem::path &name)
bool setPermissions(const std::filesystem::path &filename, QFileDevice::Permissions permissionSpec)

Class QFileInfo:

std::filesystem::path filesystemAbsoluteFilePath() const
std::filesystem::path filesystemAbsolutePath() const
std::filesystem::path filesystemCanonicalFilePath() const
std::filesystem::path filesystemCanonicalPath() const
std::filesystem::path filesystemFilePath() const
std::filesystem::path filesystemPath() const
std::filesystem::path filesystemSymLinkTarget() const
void setFile(const std::filesystem::path &file)
void stat()

Class QFuture:

bool isSuspended() const
bool isSuspending() const
bool isValid() const
QFuture<T> onCanceled(Function &&handler)
QFuture<T> onFailed(Function &&handler)
void setSuspended(bool suspend)
void suspend()
T takeResult()
QFuture<ResultType<Function> > then(Function &&function)
QFuture<ResultType<Function> > then(QtFuture::Launch policy, Function &&function)
QFuture<ResultType<Function> > then(QThreadPool *pool, Function &&function)
void toggleSuspended()

Class QFutureWatcher:

bool isSuspended() const
bool isSuspending() const
void setSuspended(bool suspend)
void suspend()
void suspended()
void suspending()
void toggleSuspended()

Class QIODevice:

virtual qint64 skipData(qint64 maxSize)

Class QHash:

size_t qHash(char8_t key, size_t seed)
size_t qHash(char16_t key, size_t seed)
size_t qHash(char32_t key, size_t seed)
size_t qHash(wchar_t key, size_t seed)
size_t qHash(const QByteArrayView &key, size_t seed)
size_t qHash(std::nullptr_t key, size_t seed)
size_t qHash(QPoint key, size_t seed)
size_t qHash(const QTypeRevision &key, size_t seed)
size_t qHashMulti(size_t seed, const T &... args)
size_t qHashMultiCommutative(size_t seed, const T &... args)

Class QJsonValue:

qint64 toInteger(qint64 defaultValue) const

Class QLatin1String:

QLatin1String first(qsizetype n) const
QLatin1String last(qsizetype n) const
QLatin1String sliced(qsizetype pos) const
QLatin1String sliced(qsizetype pos, qsizetype n) const
QString toString() const
decltype(qTokenize(*this, std::forward<Needle>(needle), flags...)) tokenize(Needle &&sep, Flags... flags) const

Class QLibraryInfo:

QString path(QLibraryInfo::LibraryPath p)

Class QList:

void append(QList<T> &&value)
QList<T> first(qsizetype n) const
QList<T> last(qsizetype n) const
QList<T> operator+(QList<T> &&other) const
QList<T> &operator+=(QList<T> &&other)
QList<T> &operator<<(QList<T> &&other)
QList<T> sliced(qsizetype pos, qsizetype n) const
QList<T> sliced(qsizetype pos) const

Class QLocale:

QString quoteString(QStringView str, QLocale::QuotationStyle style) const

Class QMap:

QMap::iterator erase(QMap::const_iterator first, QMap::const_iterator last)

Class QMargins:

QMargins operator|(const QMargins &m1, const QMargins &m2)

Class QMarginsF:

QMarginsF operator|(const QMarginsF &m1, const QMarginsF &m2)

Class QMetaMethod:

QMetaType parameterMetaType(int index) const
QByteArray parameterTypeName(int index) const
int relativeMethodIndex() const
QMetaType returnMetaType() const

Class QMetaProperty:

QUntypedBindable bindable(QObject *object) const
bool isBindable() const
QMetaType metaType() const
int typeId() const

Class QMetaSequence:

QMetaSequence fromContainer()

Class QMetaType:

qsizetype alignOf() const
QPartialOrdering compare(const void *lhs, const void *rhs) const
bool equals(const void *lhs, const void *rhs) const
bool hasRegisteredDebugStreamOperator() const
bool hasRegisteredMutableViewFunction()
bool registerMutableView(MemberFunction function)
bool registerMutableView(MemberFunctionOk function)
bool registerMutableView(UnaryFunction function)
bool view(QMetaType fromType, void *from, QMetaType toType, void *to)

Class QModelIndex:

void multiData(QModelRoleDataSpan roleDataSpan) const

Class QMultiHash:

QMultiHash<Key, T> &unite(const QHash<Key, T> &other)

Class QMultiMap:

QMultiMap::iterator erase(QMultiMap::const_iterator first, QMultiMap::const_iterator last)

Class QPersistentModelIndex:

void multiData(QModelRoleDataSpan roleDataSpan) const

Class QPointer:

T *get() const

Class QProcess:

std::function<void ()> childProcessModifier() const
void setChildProcessModifier(const std::function<void ()> &modifier)
void startCommand(const QString &command, QIODeviceBase::OpenMode mode)

Class QRect:

QRect span(const QPoint &p1, const QPoint &p2)

Class QRegularExpression:

QRegularExpression fromWildcard(QStringView pattern, Qt::CaseSensitivity cs, QRegularExpression::WildcardConversionOptions options)
QRegularExpressionMatchIterator globalMatch(QStringView subjectView, qsizetype offset, QRegularExpression::MatchType matchType, QRegularExpression::MatchOptions matchOptions) const
QRegularExpressionMatch match(QStringView subjectView, qsizetype offset, QRegularExpression::MatchType matchType, QRegularExpression::MatchOptions matchOptions) const

Class QSharedDataPointer:

T *get()
const T *get() const
void reset(T *ptr)
T *take()

Class QSortFilterProxyModel:

void autoAcceptChildRowsChanged(bool autoAcceptChildRows)
void invalidateColumnsFilter()
void invalidateRowsFilter()

Class QString:

qsizetype count(QStringView str, Qt::CaseSensitivity cs) const
QString first(qsizetype n) const
QString fromLatin1(QByteArrayView str)
QString fromLocal8Bit(QByteArrayView str)
QString fromUtf8(QByteArrayView str)
QString fromUtf8(const char8_t *str, qsizetype size)
QString &insert(qsizetype position, QStringView str)
QString last(qsizetype n) const
int localeAwareCompare(QStringView other) const
int localeAwareCompare(QStringView s1, QStringView s2)
QString &operator+=(QStringView str)
QString &prepend(QStringView str)
QString sliced(qsizetype pos, qsizetype n) const
QString sliced(qsizetype pos) const
decltype(qTokenize(*this, std::forward<Needle>(needle), flags...)) tokenize(Needle &&sep, Flags... flags) const &
decltype(qTokenize(std::move(*this), std::forward<Needle>(needle), flags...)) tokenize(Needle &&sep, Flags... flags) &&

Class QStringListModel:

virtual bool clearItemData(const QModelIndex &index) override

Class QStringView:

QStringView::const_pointer constData() const
qsizetype count(QChar ch, Qt::CaseSensitivity cs) const
qsizetype count(QStringView str, Qt::CaseSensitivity cs) const
QStringView first(qsizetype n) const
QStringView last(qsizetype n) const
QStringView sliced(qsizetype pos, qsizetype n) const
QStringView sliced(qsizetype pos) const
QList<QStringView> split(QStringView sep, Qt::SplitBehavior behavior, Qt::CaseSensitivity cs) const
QList<QStringView> split(QChar sep, Qt::SplitBehavior behavior, Qt::CaseSensitivity cs) const
QList<QStringView> split(const QRegularExpression &re, Qt::SplitBehavior behavior) const
CFStringRef toCFString() const
double toDouble(bool *ok) const
float toFloat(bool *ok) const
int toInt(bool *ok, int base) const
long toLong(bool *ok, int base) const
qlonglong toLongLong(bool *ok, int base) const
NSString *toNSString() const
short toShort(bool *ok, int base) const
uint toUInt(bool *ok, int base) const
ulong toULong(bool *ok, int base) const
qulonglong toULongLong(bool *ok, int base) const
ushort toUShort(bool *ok, int base) const
decltype(qTokenize(*this, std::forward<Needle>(needle), flags...)) tokenize(Needle &&sep, Flags... flags) const

Class QStringTokenizer:

decltype(QtPrivate::Tok::TokenizerResult<Haystack, Needle>({std::forward<Haystack>(h), std::forward<Needle>(n), flags...})) qTokenize(Haystack &&haystack, Needle &&needle, Flags... flags)

Class QThreadPool:

bool contains(const QThread *thread) const

Class QTime:

QTime fromString(QStringView string, Qt::DateFormat format)
QTime fromString(QStringView string, QStringView format)
QTime fromString(const QString &string, QStringView format)

Class QTypeRevision:

QDataStream &operator<<(QDataStream &out, const QTypeRevision &revision)
QDataStream &operator>>(QDataStream &in, QTypeRevision &revision)

Class QUnhandledException:

std::exception_ptr exception() const
void swap(QUnhandledException &other)

Class QVariant:

bool canConvert(QMetaType type) const
QPartialOrdering compare(const QVariant &lhs, const QVariant &rhs)
bool convert(QMetaType targetType)
QMetaType metaType() const

Class QVarLengthArray:

QVarLengthArray<T, Prealloc> &operator=(QVarLengthArray<T, Prealloc> &&other)

Class QAction:

QList<QObject *> associatedObjects() const

Class QIcon:

QPixmap pixmap(const QSize &size, qreal devicePixelRatio, QIcon::Mode mode, QIcon::State state) const

Class QImageIOHandler:

bool allocateImage(QSize size, QImage::Format format, QImage *image)

Class QImage:

QImage convertedTo(QImage::Format format, Qt::ImageConversionFlags flags) const &
QImage convertedTo(QImage::Format format, Qt::ImageConversionFlags flags) &&
QImage fromHBITMAP(HBITMAP hbitmap)
QImage fromHICON(HICON icon)
void mirror(bool horizontal, bool vertical)
void rgbSwap()
HBITMAP toHBITMAP() const
HICON toHICON(const QImage &mask) const

Class QImageReader:

int allocationLimit()
void setAllocationLimit(int mbLimit)

Class QInputEvent:

const QInputDevice *device() const

Class QKeyEvent:

QKeyCombination keyCombination() const

Class QPagedPaintDevice:

QPageRanges pageRanges() const
virtual void setPageRanges(const QPageRanges &ranges)

Class QRegion:

QRegion fromHRGN(HRGN hrgn)
HRGN toHRGN() const

Class QShortcut:

QList<QKeySequence> keys() const
void setKeys(QKeySequence::StandardKey key)
void setKeys(const QList<QKeySequence> &keys)

Class QStandardItem:

virtual void multiData(QModelRoleDataSpan roleDataSpan) const

Class QSurfaceFormat:

void setColorSpace(const QColorSpace &colorSpace)

Class QTextCharFormat:

qreal baselineOffset() const
void setBaselineOffset(qreal baseline)
void setSubScriptBaseline(qreal baseline)
void setSuperScriptBaseline(qreal baseline)
qreal subScriptBaseline() const
qreal superScriptBaseline() const

Class QTextDocument:

qreal baselineOffset() const
void setBaselineOffset(qreal baseline)
void setSubScriptBaseline(qreal baseline)
void setSuperScriptBaseline(qreal baseline)
qreal subScriptBaseline() const
qreal superScriptBaseline() const

Class QWindow:

QPointF mapFromGlobal(const QPointF &pos) const
QPointF mapToGlobal(const QPointF &pos) const
virtual void paintEvent(QPaintEvent *ev)

Class QSslConfiguration:

bool handshakeMustInterruptOnError() const
bool missingCertificateIsFatal() const
void setCiphers(const QString &ciphers)
void setHandshakeMustInterruptOnError(bool interrupt)
void setMissingCertificateIsFatal(bool cannotRecover)

Class QSslSocket:


Class QQmlApplicationEngine:

void setExtraFileSelectors(const QStringList &extraFileSelectors)

Class QSGD3D11Texture:

QSGTexture *fromNative(void *texture, QQuickWindow *window, const QSize &size, QQuickWindow::CreateTextureOptions options)

Class QSGMetalTexture:

QSGTexture *fromNative(int texture, QQuickWindow *window, const QSize &size, QQuickWindow::CreateTextureOptions options)

Class QSGOpenGLTexture:

QSGTexture *fromNative(GLuint textureId, QQuickWindow *window, const QSize &size, QQuickWindow::CreateTextureOptions options)

Class QSGVulkanTexture:

QSGTexture *fromNative(VkImage image, VkImageLayout layout, QQuickWindow *window, const QSize &size, QQuickWindow::CreateTextureOptions options)

Class QQuickItem:

virtual void geometryChange(const QRectF &newGeometry, const QRectF &oldGeometry)

Class QQuickRenderControl:

void beginFrame()
void endFrame()
bool initialize()
int samples() const
void setSamples(int sampleCount)
QQuickWindow *window() const

Class QQuickWindow:

void afterFrameEnd()
void beforeFrameBegin()
QSGRendererInterface::GraphicsApi graphicsApi()
QQuickGraphicsConfiguration graphicsConfiguration() const
QQuickGraphicsDevice graphicsDevice() const
QQuickRenderTarget renderTarget() const
void setGraphicsConfiguration(const QQuickGraphicsConfiguration &config)
void setGraphicsDevice(const QQuickGraphicsDevice &device)
void setRenderTarget(const QQuickRenderTarget &target)

Class QSGRenderNode:

virtual void prepare()

Class QCanBusDeviceInfo:

QString alias() const

Class QModbusReply:

QList<QModbusDevice::IntermediateError> intermediateErrors() const

Class QSqlDriver:

virtual int maximumIdentifierLength(QSqlDriver::IdentifierType type) const

Class QSqlQuery:

QVariantList boundValues() const

Class QAbstractItemView:

virtual void initViewItemOption(QStyleOptionViewItem *option) const
virtual QAbstractItemDelegate *itemDelegateForIndex(const QModelIndex &index) const

Class QGraphicsLayoutItem:

virtual bool isEmpty() const

Class QHeaderView:

virtual void initStyleOptionForIndex(QStyleOptionHeader *option, int logicalIndex) const

Class QLabel:

QPicture picture() const

Class QWidget:

QPointF mapFrom(const QWidget *parent, const QPointF &pos) const
QPointF mapFromGlobal(const QPointF &pos) const
QPointF mapFromParent(const QPointF &pos) const
QPointF mapTo(const QWidget *parent, const QPointF &pos) const
QPointF mapToGlobal(const QPointF &pos) const
QPointF mapToParent(const QPointF &pos) const

New Functions in Namespaces

void resetOpenGLState()
QTaskBuilder<Task> task(Task &&task)

New Global Functions

long double qDegreesToRadians(long double degrees)
long double qRadiansToDegrees(long double radians)

New Macros

QT_IMPLICIT_QCHAR_CONSTRUCTION
QT_IMPLICIT_QFILEINFO_CONSTRUCTION
Q_MOC_INCLUDE
Q_OBJECT_BINDABLE_PROPERTY(containingClass, type, name, signal)
Q_OBJECT_BINDABLE_PROPERTY_WITH_ARGS(containingClass, type, name, initialvalue, signal)

New Enum Types

enum IntermediateError { ResponseCrcError, ResponseRequestMismatch }
enum WildcardConversionOption { DefaultWildcardConversion, UnanchoredWildcardConversion }
enum class AlertLevel { Warning, Fatal, Unknown }
enum class AlertType { CloseNotify, UnexpectedMessage, BadRecordMac, RecordOverflow, DecompressionFailure, …, UnknownAlertMessage }
enum class Launch { Sync, Async, Inherit }

New Type Aliases

New Properties

New Variables

New QML Types

New QML Properties

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