发布于 2016-11-07 00:30:27 | 402 次阅读 | 评论: 0 | 来源: 网友投递
Qt 跨平台的C++图形用户界面应用程序框架
Qt是一个1991年由奇趣科技开发的跨平台C++图形用户界面应用程序开发框架。它既可以开发GUI程序，也可用于开发非GUI程序，比如控制台工具和服务器。Qt是面向对象的框架，使用特殊的代码生成扩展（称为元对象编译器(Meta Object Compiler, moc)）以及一些宏，易于扩展，允许组件编程。
New Features (within existing modules)
Qt Core
Added at(), operator[], mid(), right() and left() to QLatin1String
Qt GUI
QTouchEvent now has uniqueId and rotation
Support for dithering when converting to all QImage formats
Previously private QOpenGLTextureBlitter API is made public, to help QtWayland in particular
Added capHeight() to QFontMetrics, QFontMetricsF, and QRawFont
Selection handles on Android, with edit menu for copy/paste)
Qt Quick
Refactored the Qt Quick scene graph to remove its OpenGL dependency and make it possible to create rendering backends based on other graphics APIs, such as Vulkan or Direct3D.
Integrated the software renderer for the Qt Quick scene graph as a proper backend for the scene graph (previously known as the Qt Quick 2D Renderer.)
Implemented support for partial updates in the software backend for the scene graph (2D Renderer) to prevent expensive fullscreen updates when only small areas are changing.
Added an experimental Direct3D 12 backend
Implemented caching of code and data structures generated from .qml/.js files to disk to reduce 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 which is used for that purpose. This is the foundation for further improvements with regards to input event handling, but does not affect any code using Qt Quick yet.
Qt Quick Controls 2
Added new QML types: Dialog, DialogButtonBox, MenuSeparator, RoundButton, and ToolSeparator
Added ripple effects to the Material style
Added hover effects to the Material and Universal styles
Added a 'System' theme to the Material and Universal styles
Added new experimental "platform" QML types: MenuBar, Menu, SystemTrayIcon, ColorDialog, FontDialog, MessageDialog, FileDialog and FolderDialog
Qt Widgets
Qt WebEngine
Based on Chromium 53
Windows: Requires MSVC 2015 Update 2 or later
view-source: scheme is supported
Spellchecking with Hunspell
Tooltips (HTML5 global title attribute) are now also supported in the QML API.
User scripts now support metadata (@include, @exclude, @match)
Qt WebEngine (QML) allows defining custom dialogs / context menu's
Qt WebEngine (QML) on eglfs uses builtin dialogs based on Qt Quick Controls 2
Support for printing
Added setting to enable printing of CSS backgrounds
Some chrome: schemes now supported, for instance chrome://gpu
Qt Bluetooth
Bluetooth Low Energy Peripheral support on OS X & iOS
Bluetooth Low Energy Central support on WinRT
Qt Multimedia
Added QAudio::convertVolume() (and matching QML API) function to convert an audio volume from one scale to another, e.g. logarithmic to linear.
VideoOutput (QML) now supports rendering YUV 4:2:2 (YUYV, UYVY) video frames.
GStreamer backend (Unix) now supports video probing on QCamera
Qt Network
Support for TLS PSK ciphersuites on server side
Support for configurable diffie hellman parameters
Support for HTTP/2 in Network Access Manager
Qt WebSockets
Support for TLS PSK ciphersuites on client and server side
Qt Charts
Candlestick chart type added.
Qt 3D
Main focus on maturation (improving performance, bug fixing and improving test coverage)
Paint to texture using QPainter from Weiland
Optional support for issuing commands to Qt3D aspects (e.g. from profiler)
(Screenshot framegraph node STILL UNDER REVIEW)
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 or 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 customisation of your Qt build. 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. The system allows removing individual pieces of functionality and APIs from Qt, thus creating a more lightweight set of libraries for deployment.
New Modules
Qt Wayland Compositor
Qt SCXML
Qt Serial Bus
New Platforms
Apple tvOS (technology preview)
Apple watchOS (technology preview)
Technology Preview Modules
Qt Gamepad (TP2)
Qt Speech - A module to make text to speech and speech recognition easy. For Qt 5.8 (and probably even the next few releases) only the text to speech part is released. It has backends for several speech synthesizers on macOS, Android, Windows and Linux currently.
Qt Network Authentication - currently includes support for OAuth 1 + 2
Deprecated Modules
The following modules are part of Qt 5.8 release, but deprecated and considered for removal in subsequent releases of Qt:
Qt Script
Removed Modules
Qt Quick 2D Renderer (functionality of the module has been merged into Qt Declarative)
Configurations
There are no more separate device and simulator libraries for iOS; they are now combined into a single library (and the same applies for tvOS and watchOS).
Precompiled headers now supported on iOS.
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