path: root/doc/src/whatsnew/whatsnew62.qdoc

// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GFDL-1.3-no-invariants-only

/*!
    \page whatsnew62.html
    \title What's New in Qt 6.2
    \brief Lists the new features in Qt 6.2.
    \ingroup whatsnewqt6

    \section1 New and Restored Modules in Qt 6.2

    Qt 6.2 adds the following module:

    \list
        \li \l [QML] {QtQuick.Dialogs} - A QML module that provides native
            dialogs with a Qt Quick fallback on platforms where Qt does not
            provide a native one. \l [QtQuickDialogs] FileDialog and
            \l [QtQuickDialogs] FontDialog are available in this release.
    \endlist

    Qt 6.2 reintroduces the following modules that were not present in Qt 6.1.
    All listed modules were ported to Qt 6 and the CMake build system.

    A more detailed list of changes to each module can be found in
    \l {Changes to Qt Modules in Qt 6}.

    \list
        \li \l {Qt Bluetooth}
        \list
            \li BlueZ 4 support was removed.
            \li Win32 backend was removed. As a consequence, there is no longer
                support for Qt Bluetooth using MinGW.
            \li The QML API was removed.
            \li QBluetoothTransferManager and related classes were removed.
            \li Functionality related to pairing agents was removed from
                QBluetoothLocalDevice.
        \endlist
        \li \l {Qt Multimedia}
        \list
            \li Qt Multimedia public API consists of five large functional blocks.
                Each API has undergone significant changes compared to Qt 5:
                \list
                    \li Device discovery
                    \li Low level audio
                    \li Playback and decoding
                    \li Capture and recording
                    \li Video output pipeline
                \endlist
            \li Currently supported backends:
            \list
                \li Linux: GStreamer
                \li Windows: WMF
                \li \macos/iOS: AVFoundation
                \li Android: MediaPlayer and Camera APIs
            \endlist
        \endlist
        \li \l {Qt NFC}
        \list
            \li Removed support for Linux/NearD.
            \li Added support for iOS.
        \endlist
        \li \l {Qt Positioning}
        \list
            \li Many of the properties were made bindable.
            \li Renamed QGeoPolygon::path() to QGeoPolygon::perimeter.
            \li QGeoLocation now uses QGeoShape instead of QGeoRectangle as a
                bounding area.
            \li The \c error() signal in multiple positioning classes was
                renamed to \c errorOccurred().
            \li QGeoPositionInfoSourceFactoryV2 was removed, and
                QGeoPositionInfoSourceFactory now supports custom parameters
                for the created objects.
            \li NMEA support was redesigned. The \e serialnmea plugin was
                renamed to \e nmea and now supports reading the input stream
                from a TCP socket or a raw file. The \c nmeaSource property
                was removed.
        \endlist
        \li \l {Qt Remote Objects}
        \list
            \li The local connection backend now supports abstract namespaces
                (this is a Linux-specific extension), achieved by using the new
                \c localabstract schema in the URL.
            \li \c {.rep}-files now support:
            \list
                \li Class enums.
                \li QFlags.
                \li Multiline comments (C-style).
            \endlist
            \li Enums and \l {QFlags}{flags} are now supported in POD-types and
                as keys for QMap and QHash properties in \c {.rep} files.
        \endlist
        \li \l {Qt Sensors}
        \list
            \li Most QML facing properties are now bindable.
            \li Sensor::type and QSensor::type properties are now marked as
                constant.
            \li Added parameter to QSensorBackend::sensorBusy() to be able to
                also clear the busy state.
            \li Deleted typedef for qtimestamp.
            \li Renamed sensor \c type string to \c sensorType.
            \li Windows: We can now require Windows 10 API, thereby extending
                the number of sensors supported.
            \li TI Sensor Tag as supported platform has been removed.
            \li The Linux \c sysfs backend has been removed.
            \li The sensor gesture support has been removed (input welcomed here:
                \l{https://bugreports.qt.io/projects/QTBUG/issues/QTBUG-97066}{QTBUG-97066}).
            \li Sensorfw as a platform was removed due to Sensorfw itself not yet
                ported to Qt 6.
            \li Sensor types that had only Sensorfw backend (IRProximity, Lid,
                and Tap) are not listed as supported anymore.
            \li Sensor types without any backend have been removed (Altimeter,
                Distance, and Holster).
        \endlist
        \li \l {Qt Serial Bus}
        \list
            \li QCanBusFactory was removed and QCanBusFactoryV2 was renamed to
                QCanBusFactory.
            \li QModbusRtuSerialSlave and QModbusRtuSerialMaster were renamed
                to QModbusRtuSerialServer and QModbusRtuSerialClient.
        \endlist
        \li \l {Qt Serial Port}
        \li \l {Qt WebChannel}
        \list
            \li QWebChannel properties were made bindable.
            \li The property update interval of QWebChannel can now be
                configured. 50ms update interval remains the default.
            \li QWebChannel now supports property updates for BINDABLE
                properties. However, the client side does not provide a generic
                callback mechanism if the host property does not have a NOTIFY
                signal.
            \li Signals from objects living in a different thread are now
                handled correctly
                (\l{https://bugreports.qt.io/browse/QTBUG-51366}{QTBUG-51366}).
        \endlist
        \li \l {Qt WebEngine}
        \list
            \li The submodule for Qt Quick has been renamed from \QtWebEngine to
                QtWebEngineQuick.
            \li Several classes were moved from QtWebEngineWidgets to
                QtWebEngineCore, including QWebEnginePage.
            \li Some functionality previously only accessible by deriving from
                QWebEnginePage are now accessible using synchronous signals.
            \li Favicon API added to QWebEngineProfile to look up icons for
                specific URLs.
            \li The new QWebEngineLoadingInfo class provides more detail about
                loading success or failure.
        \endlist
        \li \l {Qt WebSockets}
        \li \l {Qt WebView}
    \endlist

    \section1 New Features in Qt 6.2

    \section2 Qt Core Module

    \list
        \li Added functionality:
        \list
            \li Added QByteArrayView::compare().
            \li Added methods QFlags::test(Any)Flag(s).
            \li Added QHashSeed to control hashing (seeds are now size_t);
                this shall replace qGlobalQHashSeed and qSetGlobalQHashSeed.
            \li Added PRIxQTDATATYPE macros to facilitate printf()-style
                formatting without casts or warnings.
        \endlist
        \li Made many properties bindable.
        \li Grapheme clusters can now handle emojis.
        \li UNC paths and network shares on Windows are now handled
            consistently.
        \li The handling of the start-offset parameter, called \c from, in
            various \c {indexOf()} and \c {lastIndexOf()} methods of containers
            (principally QString, QByteArray and their views) is now more
            coherent.
        \li Like QString::number() has since the release of Qt 6.0,
            QByteArray::number()'s overloads for signed integral types now
            return a text with a minus sign followed by the number's absolute
            value instead of coercing to an unsigned type for all bases except
            ten, when passed a negative integer and any supported base.
        \li QCalendar now supports construction from the ID of a custom
            backend.
        \li QChar, QPoint, and QPointF are now primitive rather than merely
            relocatable.
        \li QCoreApplication::exit() is now, like quit(), a slot (as the
            documentation long claimed); same for QEventLoop and QThread.
        \li QDateTime now takes account of time-zones throughout time_t's range
            (in so far as the platform supplies such information), rather than
            artificially limiting the range to 1970 - 2037.
        \li Fleshed out the value-type behavior of QFlags, and it is now used
            more systematically.
        \li When building for C++20, QList (hence also QVector) is now a
            \c contiguous_iterator, satisfying \c contiguous_range.
        \li QLocalSocket::waitFor*() methods were made to support duplex
            operations on Windows (as they already did on Unix).
        \li Added std::chrono overloads to QLockFile methods, avoiding needless
            conversions between UTC and local time.
        \li QString can now be built from char8_t (when available).
        \li Made \l {QThreadPool}'s thread priority configurable; the threads
            share the pool's name if it has one.
        \li Lots of Bug-fixing, clean up, and documentation improvements.
    \endlist

    \section2 Qt GUI Module

    \list
        \li Added floating point image formats to QImage for both 16-bit and
            32-bit floats.
        \li Converting RGB images to, or painting RGB colors onto, gray-scale
            images is now gamma corrected and produces the luminance values of
            the input color space.
        \li The CSS \e text-decoration-color attribute is now supported in rich
            text spans with underlines, overlines, and strikethrough.
    \endlist

    \section2 Qt Quick Module

    \list
        \li Added support for selecting cells in a \l [QML] TableView by
            assigning it a ItemSelectionModel.
    \endlist

    \section2 Qt Quick Controls Module

    \list
        \li Added a new control; SelectionRectangle. This control can be used
            to select cells in a TableView by using a styled selection
            rectangle.
    \endlist

    \section2 Qt Widgets Module

    \list
        \li Added PM_LineEditIconSize, a new QStyle::PixelMetric enum value
            that allows styles to define a default size for icons in a
            QLineEdit.
        \li The new QGraphicsSceneEvent::timestamp method returns the timestamp
            of the original event, if applicable.
        \li QGraphicsSceneWheelEvent::phase,
            QGraphicsSceneWheelEvent::pixelDelta,
            and QGraphicsSceneWheelEvent::isInverted
            return the respective attributes of the original QWheelEvent.
    \endlist

    \section2 Qt Network Module

    \list
        \li QSslSocket
        \list
            \li TLS backends that were previously (in Qt 6.1) converted into
                plugin-like classes, were moved out of \QtNetwork and
                implemented as real plugins.
            \li Several TLS backends may now co-exist at runtime, for example,
                \OpenSSL and Schannel, or \OpenSSL and \SecureTransport.
        \endlist

        \li QNetworkInformation
        \list
            \li Introduced \l {QNetworkInformation::}{isBehindCaptivePortal},
                a new property that can be  used to determine whether the user
                is connected to a network with a captive portal.
        \endlist
    \endlist

    \section2 Qt QML Module

    \list
        \li Core language
        \list
            \li Added support for optional chaining.
            \li Added \e as casts: these mostly help tooling but can also be
                used to replace code such as
                \c {return (obj instanceof Item) ? obj.width : 42} with
                \c {(obj as Item)?.width ?? 42}.
        \endlist
        \li Added a public CMake API for QML modules: \c qt_add_qml_module().
        \list
            \li Takes care of generating \c qmldir and \c qmltypes.
            \li Can automatically create a plugin if a plugin only registers types.
            \li Has built-in support for a linting target.
        \endlist
        \li QML tooling
        \list
            \li \c qmllint
            \list
                \li Added a granular setting for the warning severity; warnings
                    can be disabled entirely, make them informational only, or
                    make them lead to a non-zero exit code.
                \li Added a settings file (\e .qmllint.ini) for configuring
                    warning levels on a directory-by-directory basis. A default
                    settings file can be generated using
                    \c {qmllint --write-defaults}.
                \li Warnings can now be disabled in blocks via comments;
                    \c {//qmllint enable/disable <warning-type1> <warning-type2...>}
                \li Greatly improved performance when linting files, especially
                    when linting multiple files with lots of imports.
                \li Added support for JSON output for use in tooling.
            \endlist
            \li \c qmlformat
            \list
                \li \c qmlformat now utilizes our new \e qmldom library and
                    should generally produce better output.
            \endlist
        \endlist
    \endlist

    \section2 Qt Quick 3D Module

    \list
        \li Added support for \e {instanced rendering}, an optimized way of
            drawing multiple instances of the same objects with different
            transformations.
        \li Added 3D Particles, an API for adding particle effects to 3D scenes.
            This includes a technology preview of model blend particles.
        \li Added Qt Quick Input events for 2D items in 3D, both in scene and
            in textures.
        \li Added an API for ray-based picking from arbitrary points in the
            scene.
        \li Added RuntimeLoader, making it possible to load glTF2 files at
            runtime.
        \li Implemented \e {parallax occlusion mapping}: Enables the use of
            height maps without the cost of adding geometry.
        \li Implemented \e {depth draw mode} on materials: Enables fine
            control over depth rendering for a material.
    \endlist

    \section2 Qt Data Visualization Module

    \list
        \li Fixed background rendering mode.
        \li RenderDirectToBackground_NoClear was deprecated as opting to not
            clear the window is no longer an option in Qt 6.
        \li Lots of minor bug fixes.
    \endlist

    \section2 Qt Charts Module

    \list
        \li Added more marker shapes to pick from in QScatterSeries and QLegend.
        \li Added a \e {light marker} feature to QXYSeries and QLegend. This is
            a lighter weight rendering of points.
        \li Added an ability to select points in a series via method calls to
            QXYSeries and QBarSet.
        \li Added an ability to set a color or use a custom light marker to be
            used for selected points in QXYSeries.
        \li Added an ability to set a color to be used for selected bars in
            QBarSet.
        \li Added a feature to display a \e {best fit line} in a QXYSeries.
        \li Added an ability to customize the look of individual points in a
            QXYSeries. This feature allows setting the visibility, label
            visibility, and the size of each point.
        \li Added a method \l {QXYSeries::}{sizeBy()} to QXYSeries that adjusts
            the size of the points in a series according to passed values.
        \li Added a method \l {QXYSeries::}{colorBy()} to QXYSeries that adjusts
            color of the points in a series according to passed values and a
            gradient.
        \li Added a new axis class QColorAxis to support the colorBy() feature,
            displaying a color scale.
        \li Added an ability to disable label truncation in axes.
        \li Improved performance by caching recently used text bounds.
        \li Added interactive support to QLegend via a \l{QLegend::}
            {setInteractive()} method. Once enabled, allows the legend to be
            detached with a double-click. Once detached, the legend can be
            dragged and resized, and reattached to a side of the chart by
            dragging it off the edge.
        \li Added \l{QLegend::}{attachedToChartChanged()} signal to QLegend.
        \li Updated the legend example.
    \endlist

    \section2 Qt for Python
    \list
        \li New examples, tutorials, and videos added to the
            \l {https://doc.qt.io/qtforpython-6/}{Qt for Python documentation}.
        \li Compatible with Python 3.10rc2.
        \li Added the QtDBus, QtNetworkAuth, and QtBluetooth modules.
        \li Added a new Shiboken feature, Opaque Containers, to avoid copying
            C++ containers into Python to use them.
        \li You can now use \c qtpaths instead of \c qmake when building PySide
            from source.
        \li Added support for std::function for some of QThreadPool's methods.
        \li Added new QML functions as well as support for
            qmlRegisterSingletonInstance.
    \endlist

    \section1 Platform Changes

    \section2 Technology Preview Platforms

    \section3 Windows on ARM

    \list
        \li Added Windows on ARM64 as a technology preview platform.
        \li Supported as a build target; no host support yet.
        \li Known limitations:
        \list
            \li No support for Qt WebEngine yet; missing official support for
                Chromium.
            \li No support for SSL yet; missing official OpenSSL support.
        \endlist
    \endlist

    \section2 Desktop Platforms

    \section3 \macos on Apple Silicon

    \list
        \li Added official support as both a target and a host platform.
        \li Libraries in the Qt SDK are built as universal binaries.
        \li Known limitations:
        \list
            \li SSL support is missing.
            \li \e postgresql and \e odbc database plugins are missing
                (\l {https://bugreports.qt.io/browse/QTBUG-93204}{QTBUG-93204}).
            \li JIT support is missing
                (\l {https://bugreports.qt.io/browse/QTBUG-93206}{QTBUG-93206}).
        \endlist
    \endlist

    \section3 Wayland Client on Linux

    \list
        \li A touchpad pinch gesture now generates Zoom and Rotate
            \l {QNativeGestureEvent}s if the compositor sends them via the
            \e pointer-gestures-unstable-v1 protocol. This allows a Qt Quick
            PinchHandler to operate via touchpad pinch gestures. Two, three, or
            four-finger gestures are recognized. A gesture of type
            Qt::PanNativeGesture can be generated by swiping with three or four
            fingers. Two-finger flicking still generates \l{QWheelEvent}s as
            before.
    \endlist

    \section2 Mobile Platforms

    \section3 Android

    \list
        \li Some of the methods previously under the \QtAndroid namespace in
            \QtAndroidExtras (for example, sdkVersion() and context()), were
            moved to QNativeInterface::QAndroidApplication.
        \li Implemented a new permissions API in QCoreApplication.
        \li The remaining \QtAndroidExtras APIs were left as private APIs in
            qtbase until cross-platform alternatives (for Intents, Services,
            etc.) are in place.
        \li Removed obsolete Ministro code as it's now unsupported by Android.
        \li Simplified \e AndroidManifest.xml to only contain tags relevant to
            the user, helping maintainability and reducing clutter.
        \li QCDebug() and friends now use the category as a tag in Android
            \e logcat.
        \li Updated Android Gradle plugin to 4.1.3.
        \li Fixed a non-SDK API bug with style
            (\l {https://bugreports.qt.io/browse/QTBUG-71590}{QTBUG-71590}),
            though Android Style for widgets on Android 9+ is still affected
            (\l {https://bugreports.qt.io/browse/QTBUG-96149}{QTBUG-96149}).
        \li The default targetSdkVersion is set to 30 in accordance with
            Google Play Store requirements.
        \li The build-tools version and platform version used is bumped to 30.
        \li QDesktopServices custom handlers are now enabled, and allow you to
            work with Android App Links, for example.
        \li Added information that allow applications to determine the source
            of an intent without creating an own extension of QtActivity.
        \li Fixed imports for QML modules and added the possibility of multiple
            QML root paths.
        \li Fixed Vulkan builds on Android.
    \endlist

    \section3 iOS

    \list
        \li Improved CMake support.
        \li Known issues:
        \list
            \li Missing default launch screen storyboard.
            \li Custom libraries fail to install
            (\l {https://bugreports.qt.io/browse/QTBUG-95381}{QTBUG-95381}).
        \endlist
    \endlist

    \section2 Embedded Platforms

    Available under the \l {Qt for Device Creation} license.

    \section3 Boot to Qt

    \list
        \li The Boot to Qt stack was updated to use Yocto 3.3 (Hardknott).
        \li Added Intel NUC10 (64bit i5 x86) as a reference target.
        \li Added NVidia Jetson Tegra X2 as a target.
    \endlist

    \section3 QNX

    \list
        \li Added QNX version 7.1 and Ubuntu 20.04 as a host.
        \li Added NXP iMX8QM as a reference target.
    \endlist

    \section3 INTEGRITY

    \list
        \li Added INTEGRITY version 19.0.13 and Ubuntu 20.04 as a host.
        \li Added Qualcomm Snapdragon 8155P as a reference target.
    \endlist

    \section3 WebOS
    Qt 6.2 has been verified to work with LG webOS OSE 2.13.1 using
    Ubuntu 20.04 as development host and Raspberry Pi4 hardware.

    \section1 List of API Changes

    These pages contain an overview of API changes in Qt 6.2:
    \list
        \li \l {New Classes and Functions in Qt 6.2}
        \li \l {Obsolete Classes}
    \endlist
*/

/*!
    \page newclasses62.html
    \title New Classes and Functions in Qt 6.2
    \ingroup whatsnewqt6
    \brief A list of new APIs in Qt 6.2.

    This page contains a comprehensive list of all new classes and functions
    introduced in Qt 6.2.

    \sincelist 6.2
*/