<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <!-- qpa.qdoc --> <title>Qt Platform Abstraction | Qt 5.9</title> <link rel="stylesheet" type="text/css" href="style/offline-simple.css" /> <script type="text/javascript"> document.getElementsByTagName("link").item(0).setAttribute("href", "style/offline.css"); // loading style sheet breaks anchors that were jumped to before // so force jumping to anchor again setTimeout(function() { var anchor = location.hash; // need to jump to different anchor first (e.g. none) location.hash = "#"; setTimeout(function() { location.hash = anchor; }, 0); }, 0); </script> </head> <body> <div class="header" id="qtdocheader"> <div class="main"> <div class="main-rounded"> <div class="navigationbar"> <table><tr> <td ><a href="index.html">Qt 5.9</a></td><td >Qt Platform Abstraction</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right">Qt 5.9.4 Reference Documentation</td> </tr></table> </div> </div> <div class="content"> <div class="line"> <div class="content mainContent"> <div class="sidebar"> <div class="toc"> <h3><a name="toc">Contents</a></h3> <ul> <li class="level1"><a href="#qpa-minimal-plugins">QPA Minimal Plugins</a></li> <li class="level1"><a href="#class-overview">Class Overview</a></li> <li class="level1"><a href="#qpa-plugins">QPA Plugins</a></li> </ul> </div> <div class="sidebar-content" id="sidebar-content"></div></div> <h1 class="title">Qt Platform Abstraction</h1> <span class="subtitle"></span> <!-- $$$qpa.html-description --> <div class="descr"> <a name="details"></a> <p>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.</p> <p>QPA plugins are implemented by subclassing various <code>QPlatform*</code> classes. There are several <i>root</i> classes, such as <code>QPlatformIntegration</code> and <code>QPlatformWindow</code> for window system integration and <code>QPlatformTheme</code> for deeper platform theming and integration. QStyle is not a part of QPA.</p> <p>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.)</p> <a name="qpa-minimal-plugins"></a> <h2 id="qpa-minimal-plugins">QPA Minimal Plugins</h2> <p>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:</p> <ul> <li><code>qtbase/src/plugins/platforms/minimal/</code></li> <li><code>qtbase/src/plugins/platforms/minimalegl/</code></li> </ul> <p>The <code>qminimal</code> plugin is used for tools that link against Qt GUI, but do not require window system integration (for example, <code>qmlplugindump</code>). It also has diagnostic support for dumping window contents to image files as determined by environment variables.</p> <a name="class-overview"></a> <h2 id="class-overview">Class Overview</h2> <ul> <li>QPlatformIntegration<ul> <li>QAbstractEventDispatcher</li> <li>QPlatformAccessibility</li> <li>QPlatformBackingStore</li> <li>QPlatformClipboard</li> <li>QPlatformCursor</li> <li>QPlatformDrag</li> <li>QPlatformFontDatabase</li> <li>QPlatformGraphicsBuffer</li> <li>QPlatformInputContext</li> <li>QPlatformNativeInterface</li> <li>QPlatformOffscreenSurface</li> <li>QPlatformOpenGLContext</li> <li>QPlatformScreen</li> <li>QPlatformServices</li> <li>QPlatformSharedGraphicsCache</li> <li>QPlatformSurface</li> <li>QPlatformWindow</li> </ul> </li> <li>QPlatformTheme<ul> <li>QPlatformDialogHelper</li> <li>QPlatformMenu</li> <li>QPlatformMenuBar</li> <li>QPlatformMenuItem</li> <li>QPlatformSystemTrayIcon</li> <li>platform palettes</li> <li>platform fonts</li> <li>theme hints</li> </ul> </li> </ul> <p><code>qtbase/src/platformsupport</code> contains several helper classes for implementing platform plugins on Unix-like systems.</p> <a name="qpa-plugins"></a> <h2 id="qpa-plugins">QPA Plugins</h2> <p>The following table summarizes the platform plugins available for QPA:</p> <div class="table"><table class="generic"> <thead><tr class="qt-style"><th >Plugin Name</th><th >Plugin Class Name</th><th >Description</th></tr></thead> <tr valign="top" class="odd"><td ><code>qandroid</code></td><td >QAndroidPlatformIntegration</td><td ><a href="android-support.html">Android support</a></td></tr> <tr valign="top" class="even"><td ><code>qbsdfb</code></td><td >QBsdFbIntegration</td><td >BsdFb support</td></tr> <tr valign="top" class="odd"><td ><code>qcocoa</code></td><td >QCocoaIntegrationPlugin</td><td ><a href="osx.html">Cocoa support</a></td></tr> <tr valign="top" class="even"><td ><code>qdirect2d</code></td><td >QWindowsDirect2DIntegrationPlugin</td><td >Similar to the <code>qwindows</code> plugin, but replaces the raster paint engine with a Direct2D-based paint engine for QPixmap and QBackingStore.</td></tr> <tr valign="top" class="odd"><td ><code>qdirectfb</code></td><td >QDirectFbIntegrationPlugin</td><td >DirectFB is centered around <i>surfaces</i>, which are the equivalent of a QPaintDevice.</td></tr> <tr valign="top" class="even"><td ><code>qeglfs</code></td><td >QEglFSIntegrationPlugin</td><td ><a href="vxworks.html#eglfs">EGLFS</a> support for embedded Linux devices.</td></tr> <tr valign="top" class="odd"><td ><code>qhaiku</code></td><td >QHaikuIntegration</td><td >Haiku support</td></tr> <tr valign="top" class="even"><td ><code>qios</code></td><td >QIOSIntegrationPlugin</td><td ><a href="ios-support.html">iOS support</a></td></tr> <tr valign="top" class="odd"><td ><code>qlinuxfb</code></td><td >QLinuxFbIntegrationPlugin</td><td ><a href="embedded-linux.html#linuxfb">LinuxFB</a> support for embedded Linux devices.</td></tr> <tr valign="top" class="even"><td ><code>qmirclient</code></td><td >QMirClientIntegration</td><td >Mir client support</td></tr> <tr valign="top" class="odd"><td ><code>qopenwf</code></td><td >QOpenWFDIntegrationPlugin</td><td >OpenWF Display support for managing display control hardware.</td></tr> <tr valign="top" class="even"><td ><code>qqnx</code></td><td >QQnxIntegrationPlugin</td><td ><a href="platform-notes-qnx.html">QNX support</a></td></tr> <tr valign="top" class="odd"><td ><code>qvnc</code></td><td >QVncIntegration</td><td >VNC support</td></tr> <tr valign="top" class="even"><td ><code>qwayland</code></td><td ><ul> <li>QWaylandIntegrationPlugin</li> <li>QWaylandBrcmEglPlatformIntegrationPlugin</li> <li>QWaylandEglPlatformIntegrationPlugin</li> <li>QWaylandXCompositeEglPlatformIntegrationPlugin</li> <li>QWaylandXCompositeGlxPlatformIntegrationPlugin</li> </ul> </td><td >Wayland support</td></tr> <tr valign="top" class="odd"><td ><code>qwindows</code></td><td >QWindowsIntegrationPlugin</td><td ><a href="windows-support.html">Windows support</a></td></tr> <tr valign="top" class="even"><td ><code>qwinrt</code></td><td >QWinRTIntegrationPlugin</td><td ><a href="winrt-support.html">WinRT and Windows Phone support</a></td></tr> <tr valign="top" class="odd"><td ><code>qxcb</code></td><td >QXcbIntegrationPlugin</td><td ><a href="linux.html">X Window System (X11) support</a></td></tr> </table></div> </div> <!-- @@@qpa.html --> </div> </div> </div> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2017 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners.<br> The documentation provided herein is licensed under the terms of the <a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation License version 1.3</a> as published by the Free Software Foundation.<br> Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners. </p> </div> </body> </html>