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Diffstat (limited to 'src/platformheaders/doc/src/qtplatformheaders.qdoc')
-rw-r--r-- | src/platformheaders/doc/src/qtplatformheaders.qdoc | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/src/platformheaders/doc/src/qtplatformheaders.qdoc b/src/platformheaders/doc/src/qtplatformheaders.qdoc new file mode 100644 index 0000000000..74df288d3d --- /dev/null +++ b/src/platformheaders/doc/src/qtplatformheaders.qdoc @@ -0,0 +1,82 @@ +/**************************************************************************** +** +** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/legal +** +** This file is part of the documentation of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:FDL$ +** Commercial License Usage +** Licensees holding valid commercial Qt licenses may use this file in +** accordance with the commercial license agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and Digia. For licensing terms and +** conditions see http://qt.digia.com/licensing. For further information +** use the contact form at http://qt.digia.com/contact-us. +** +** GNU Free Documentation License Usage +** Alternatively, this file may be used under the terms of the GNU Free +** Documentation License version 1.3 as published by the Free Software +** Foundation and appearing in the file included in the packaging of +** this file. Please review the following information to ensure +** the GNU Free Documentation License version 1.3 requirements +** will be met: http://www.gnu.org/copyleft/fdl.html. +** $QT_END_LICENSE$ +** +****************************************************************************/ + +/*! + \module QtPlatformHeaders + \title Qt Platform Headers C++ Classes + \ingroup modules + + \brief The Qt Platform Headers module offers header-only inline classes that + encapsulate platform-specific information that is tied to a given runtime + configuration of a platform plugin. +*/ + +/*! + \page qtplatformheaders-index.html + \title Qt Platform Headers + + \brief The Qt Platform Headers module offers header-only inline classes that + encapsulate platform-specific information that is tied to a given runtime + configuration of a platform plugin. + + Some applications may need to interface Qt with other frameworks. This often + means using graphics contexts or other types of native handles created by + one framework with another. For example, on some platforms, QOpenGLContext + offers the ability to wrap an existing native OpenGL context, instead of + creating a new one. This existing native context can be created by some + other third-party code. + + The type of such native handles is highly platform specific and in some + cases the platform plugin will need more information to adopt a handle, just + the handle in itself will not be sufficient. Therefore the public API + consists of functions taking or returning a QVariant that contains a + platform-specific value type. See for example + QOpenGLContext::setNativeHandle() and QOpenGLContext::nativeHandle(). When + running on Linux/X11, using the xcb platform plugin and the GLX windowing + system interface, the variant contains a QGLXNativeContext. On other + platforms a different class will be used. These classes are all placed in + the Qt Platform Headers module. + + Platform headers can be used in conjunction with + QGuiApplication::platformFunction() to give a type safe interface to + platform specific functionality. It is possible for headers defined in + QtPlatformHeaders to define typedefs for functions that can be returned by + a platform plugin from QGuiApplication::platformFunction(). Headers in + QtPlatformHeaders can also implement wrapper functions for the function + pointer, giving a static function that can be called from any context after + the platform integration has been created. An implementation of this + pattern is QXcbWindowFunctions::setWmWindowType(). This function retrieves + a function pointer from QGuiApplication::platformFunction, and executes + that function if the requested function was returned. + + \note Similar to the other QPA APIs, there are no binary compatibility + guarantees for these classes, meaning that an application using these + classes is only guaranteed to work with the Qt version it was developed + against. Unlike QPA however, source compatibility is guaranteed. + + \sa QXcbWindowFunctions + */ |