Qt 5.15
What's New in Qt 5.8
Qt 5.15.8 Reference Documentation

What's New in Qt 5.8

New Features in Qt 5.8

Qt Core Module

Added at(), operator[], mid(), right(), and left() functions to QLatin1String.

Qt GUI Module

Added uniqueId() and rotation() to QTouchEvent.
Added support for dithering when converting to all QImage formats.
Made the QOpenGLTextureBlitter API public; used particularly in Qt Wayland.
Added capHeight() to QFontMetrics, QFontMetricsF, and QRawFont.
Added selection handles on Android, with an edit menu for copy and paste.

Qt Quick Module

Refactored the Qt Quick scene graph to remove its OpenGL dependency, enabling backends based on other graphics APIs such as Vulkan or Direct3D.
Integrated the software renderer (previously known as the Qt Quick 2D Renderer) for Qt Quick as a proper scene graph backend.
Implemented support for partial updates in the software renderer.
Added an experimental Direct3D 12 backend.
Implemented caching of code and data structures generated from .qml and .js files to disk, reducing start-up time and memory consumption. The resulting .qmlc and .jsc cache files are memory mapped.
Cleaned up touch and mouse event delivery, and added a new internal class QQuickPointerEvent for this purpose.

Qt Quick Controls 2 Module

Added new QML types: Dialog, DialogButtonBox, MenuSeparator, RoundButton, and ToolSeparator.
Added ripple effects to the Material style.
Added hover effects to Material and Universal styles
Added a System theme to Material and Universal styles
Added new experimental platform QML types: MenuBar, Menu, SystemTrayIcon, ColorDialog, FontDialog, MessageDialog, FileDialog, and FolderDialog.

Qt WebEngine Module

Based on Chromium 53.
Updated requirements to MSVC 2015 Update 2 or later on Windows.
Added view-source scheme support.
Added support for spellchecking with custom .bdic files.
Made tooltips (HTML5 global tile attribute) visible.
Added support for metadata (@include, @exclude, @match, @name, and @run-at) in user scripts.
QML: Enabled the use of custom dialogs and context menus.
QML: on eglfs, took the built-in dialogs based on Qt Quick Controls 2 into use.
Added support for printing.
Added a setting to enable printing of CSS backgrounds.

Qt Bluetooth Module

Added Bluetooth Low Energy Peripheral support on macOS, iOS, and WinRT.

Qt Multimedia Module

Added QAudio::convertVolume() and a matching QML method to convert audio volumes from one scale to another; for example, from logarithmic to linear scale.
Added support for rendering YUV 4:2:2 (YUYV, UYVY) video frames to VideoOutput QML type.

Qt Network Module

Added support for TLS-PSK ciphersuites on server side.
Added support for configurable Diffie-Hellman parameters.
Added support for HTTP/2 in Network Access Manager.

Qt WebSockets Module

Added support for TLS-PSK ciphersuites on client and server side.

Qt Charts Module

Added a candlestick chart type.

Qt 3D Module

Focused on maturation: Bug fixes, improving performance and test coverage.
Added a paint to texture feature using QPainter.
Added optional support for issuing commands to Qt3D aspects (for example, from a profiler).

Embedded Platforms

Enhanced multi-screen capabilities and configurability with eglfs when running on KMS/DRM, both with GBM and EGLDevice/Stream.
Added support for 90 and 180 degrees rotation of software-rendered content (QWidget) in eglfs.

Configurability (Qt Lite Project)

Qt 5.8 comes with a rewritten configuration system that allows for easy customization of Qt builds. The main focus of this feature is for the Device Creation, but it can also be used to tailor a Qt build for mobile or desktop platforms. The new configuration system allows removing individual pieces of functionality and APIs from Qt, creating a more lightweight set of libraries for deployment.

New Modules

Qt Wayland Compositor
- Provides a framework to develop a Wayland compositor.
Qt SCXML
- Enables static and runtime integration of SCXML models into Qt code.
Qt Serial Bus
- Provides access to various industrial serial buses and protocols, such as CAN and ModBus.

These modules were previously released as technology previews, and are now fully supported Qt add-on modules.

Technology Preview Modules

Qt Gamepad
- Enables Qt gaming applications to respond to gamepad input.
Qt Speech
- Text to speech and speech recognition functionality. Currently only the text to speech features are released. Includes backends for several speech synthesizers on Windows, Linux, macOS, and Android.
Qt Network Authorization
- Online authorization support with OAuth protocol, versions 1 and 2.

Deprecated Functionality

Qt Script

Deprecated modules are still included in Qt 5.8, but are considered for removal in future releases.

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