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diff --git a/examples/widgets/doc/src/styleplugin.qdoc b/examples/widgets/doc/src/styleplugin.qdoc deleted file mode 100644 index 5977633428..0000000000 --- a/examples/widgets/doc/src/styleplugin.qdoc +++ /dev/null @@ -1,138 +0,0 @@ -/**************************************************************************** -** -** Copyright (C) 2016 The Qt Company Ltd. -** Contact: https://www.qt.io/licensing/ -** -** 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 The Qt Company. For licensing terms -** and conditions see https://www.qt.io/terms-conditions. For further -** information use the contact form at https://www.qt.io/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: https://www.gnu.org/licenses/fdl-1.3.html. -** $QT_END_LICENSE$ -** -****************************************************************************/ - -/*! - \example tools/styleplugin - \title Style Plugin Example - \ingroup examples-widgets-tools - - \brief This example shows how to create a plugin that extends Qt with a new - GUI look and feel. - - \image stylepluginexample.png - - A plugin in Qt is a class stored in a shared library that can be - loaded by a QPluginLoader at run-time. When you create plugins in - Qt, they either extend a Qt application or Qt itself. Writing a - plugin that extends Qt itself is achieved by inheriting one of the - plugin \l{Plugin Classes}{base classes}, reimplementing functions - from that class, and adding a macro. In this example we extend Qt - by adding a new GUI look and feel (i.e., making a new QStyle - available). A high-level introduction to plugins is given in the - plugin \l{How to Create Qt Plugins}{overview document}. - - Plugins that provide new styles inherit the QStylePlugin base - class. Style plugins are loaded by Qt and made available through - QStyleFactory; we will look at this later. We have implemented \c - SimpleStylePlugin, which provides \c SimpleStyle. The new style - contributes to widget styling by drawing button backgrounds in - red - not a major contribution, but it still makes a new style. - - The new style is platform agnostic in the sense that it is not - based on any specific style implementation, but uses QProxyStyle - to merely tweak the looks in the current application style that - defaults to the native system style. - - \note On some platforms, the native style will prevent the button - from having a red background. In this case, try to run the example - in another style (e.g., fusion). - - We test the plugin with \c StyleWindow, in which we display a - QPushButton. The \c SimpleStyle and \c StyleWindow classes do not - contain any plugin specific functionality and their implementations - are trivial; we will therefore leap past them and head on to the \c - SimpleStylePlugin and the \c main() function. After we have looked - at that, we examine the plugin's profile. - - - \section1 SimpleStylePlugin Class Definition - - \c SimpleStylePlugin inherits QStylePlugin and is the plugin - class. - - \snippet tools/styleplugin/plugin/simplestyleplugin.h 0 - - \c keys() returns a list of style names that this plugin can - create, while \c create() takes such a string and returns the - QStyle corresponding to the key. Both functions are pure virtual - functions reimplemented from QStylePlugin. When an application - requests an instance of the \c SimpleStyle style, which this - plugin creates, Qt will create it with this plugin. - - - \section1 SimpleStylePlugin Class Implementation - - Here is the implementation of \c keys(): - - \snippet tools/styleplugin/plugin/simplestyleplugin.cpp 0 - - Since this plugin only supports one style, we return a QStringList - with the class name of that style. - - Here is the \c create() function: - - \snippet tools/styleplugin/plugin/simplestyleplugin.cpp 1 - - Note that the key for style plugins are case insensitive. - The case sensitivity varies from plugin to plugin, so you need to - check this when implementing new plugins. - - \section1 The \c main() function - - \snippet tools/styleplugin/stylewindow/main.cpp 0 - - Qt loads the available style plugins when the QApplication object - is initialized. The QStyleFactory class knows about all styles and - produces them with \l{QStyleFactory::}{create()} (it is a - wrapper around all the style plugins). - - \section1 The Simple Style Plugin Profile - - The \c SimpleStylePlugin lives in its own directory and have - its own profile: - - \snippet tools/styleplugin/plugin/plugin.pro 0 - - In the plugin profile we need to set the lib template as we are - building a shared library instead of an executable. We must also - set the config to plugin. We set the library to be stored in the - styles folder under stylewindow because this is a path in which Qt - will search for style plugins. - - \section1 Related Articles and Examples - - In addition to the plugin \l{How to Create Qt Plugins}{overview - document}, we have other examples and articles that concern - plugins. - - In the \l{Echo Plugin Example}{echo plugin example} we show how to - implement plugins that extends Qt applications rather than Qt - itself, which is the case with the style plugin of this example. - The \l{Plug & Paint Example}{plug & paint} example shows how to - implement a static plugin as well as being a more involved example - on plugins that extend applications. -*/ |