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Qt Platform Abstraction

Qt Reference Documentation.

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Qt Platform Abstraction

The Qt Platform Abstraction (QPA) is the platform abstraction layer for Qt 5 and replaces Qt for Embedded Linux and the platform ports from Qt 4.

QPA plugins are implemented by subclassing various QPlatform* classes. There are several root classes, such as QPlatformIntegration and QPlatformWindow for window system integration and QPlatformTheme for deeper platform theming and integration. QStyle is not a part of QPA.

There are no source or binary compatibility guarantees for the QPA classes, meaning that a platform plugin is only guaranteed to work with the Qt version it was developed against. API changes will however only be made in minor releases. (5.1, 5.2, and so on.)

QPA Minimal Plugins

There is no detailed tutorial documentation for writing QPA plugins at this time. However, there are two minimal plugins shipped with Qt 5 for testing and other special purposes that you can use as examples:

  • qtbase/src/plugins/platforms/minimal/

  • qtbase/src/plugins/platforms/minimalegl/

The qminimal plugin is used for tools that link against Qt GUI, but do not require window system integration (for example, qmlplugindump). It also has diagnostic support for dumping window contents to image files as determined by environment variables.

Class Overview

  • QPlatformIntegration

    • QAbstractEventDispatcher

    • QPlatformAccessibility

    • QPlatformBackingStore

    • QPlatformClipboard

    • QPlatformCursor

    • QPlatformDrag

    • QPlatformFontDatabase

    • QPlatformGraphicsBuffer

    • QPlatformInputContext

    • QPlatformNativeInterface

    • QPlatformOffscreenSurface

    • QPlatformOpenGLContext

    • QPlatformScreen

    • QPlatformServices

    • QPlatformSharedGraphicsCache

    • QPlatformSurface

    • QPlatformWindow

  • QPlatformTheme

    • QPlatformDialogHelper

    • QPlatformMenu

    • QPlatformMenuBar

    • QPlatformMenuItem

    • QPlatformSystemTrayIcon

    • platform palettes

    • platform fonts

    • theme hints

qtbase/src/platformsupport contains several helper classes for implementing platform plugins on Unix-like systems.

QPA Plugins

The following table summarizes the platform plugins available for QPA:

Plugin Name

Plugin Class Name

Description

qandroid

QAndroidPlatformIntegration

Android support

qbsdfb

QBsdFbIntegration

BsdFb support

qcocoa

QCocoaIntegrationPlugin

Cocoa support

qdirect2d

QWindowsDirect2DIntegrationPlugin

Similar to the qwindows plugin, but replaces the raster paint engine with a Direct2D-based paint engine for QPixmap and QBackingStore.

qdirectfb

QDirectFbIntegrationPlugin

DirectFB is centered around surfaces, which are the equivalent of a QPaintDevice.

qeglfs

QEglFSIntegrationPlugin

EGLFS support for embedded Linux devices.

qhaiku

QHaikuIntegration

Haiku support

qios

QIOSIntegrationPlugin

iOS support

qlinuxfb

QLinuxFbIntegrationPlugin

LinuxFB support for embedded Linux devices.

qmirclient

QMirClientIntegration

Mir client support

qopenwf

QOpenWFDIntegrationPlugin

OpenWF Display support for managing display control hardware.

qqnx

QQnxIntegrationPlugin

QNX support

qvnc

QVncIntegration

VNC support

qwasm

QWasmIntegration

WebAssembly support

qwayland

  • QWaylandIntegrationPlugin

  • QWaylandBrcmEglPlatformIntegrationPlugin

  • QWaylandEglPlatformIntegrationPlugin

  • QWaylandXCompositeEglPlatformIntegrationPlugin

  • QWaylandXCompositeGlxPlatformIntegrationPlugin

Wayland support

qwindows

QWindowsIntegrationPlugin

Windows support

qwinrt

QWinRTIntegrationPlugin

Universal Windows Platform (UWP) support

This plugin was originally written for WinRT (Windows Runtime), and is therefore called qwinrt.

qxcb

QXcbIntegrationPlugin

X Window System (X11) support

webgl

QWebGLIntegrationPlugin

WebGL support for Qt Quick applications

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