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diff --git a/examples/applicationmanager/application-features/doc/src/application-features.qdoc b/examples/applicationmanager/application-features/doc/src/application-features.qdoc new file mode 100644 index 00000000..43dc7c71 --- /dev/null +++ b/examples/applicationmanager/application-features/doc/src/application-features.qdoc @@ -0,0 +1,92 @@ +/**************************************************************************** +** +** Copyright (C) 2019 Luxoft Sweden AB +** Contact: https://www.qt.io/licensing/ +** +** This file is part of the documentation of the Qt Application Manager. +** +** $QT_BEGIN_LICENSE:FDL-QTAS$ +** Commercial License Usage +** Licensees holding valid commercial Qt Automotive Suite 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 applicationmanager/application-features +\title Application Features Example +\image application-features.png +\brief Showcases client applications with various features, including a native application. +\ingroup applicationmanager-examples + +\section1 Introduction + +This example demonstrates some particular features that an application might implement, for +instance it shows how to implement a nested compositor and it is the only example with an +application that uses the "native" runtime. Most of the features are only supported properly in +multi-process mode (for details see the following section). + +\note This example focuses on the application (client) side. The System UI (compositor/server) is just a +modified version of the "Desktop System UI Example" (minidesk). For more information on how this +System UI is implemented, see \l{Desktop System UI Example}. + + +\section1 The Client Applications + +The following applications are included in this example: + +\section2 Nested Compositor +The nested compositor application shows how a Wayland compositor can be implemented inside an +application (Wayland client) window. The compositor is implemented in pure QML and is kept to a +minimum. In order to display Wayland clients inside this compositor, the WAYLAND_DISPLAY +environment variable needs to be set appropriately. Starting a client on the command line could be +done like this: +\badcode +WAYLAND_DISPLAY=qtam-wayland-nested qmlscene client.qml -platform wayland +\endcode +Note that this works only in multi-process mode, since the nested compositor needs a real window as +its root element. + +\section2 Crash Simulation and Recovery +The crash application provides various means to force a crash in the application, like a +segmentation fault. It utilizes a QML plugin implemented in C++, that provides the \c Terminator +QML type to trigger crashes. The application manager will print the cause of the crash and other +information like a backtrace. The System UI implements a basic form of crash recovery: it simply +restarts the application. Note that this works only in mulit-process mode. In single process mode a +crash will affect the entire (System UI) program. + +\section2 Two Top-Level Windows +This application shows how multiple top-level windows can be displayed by having a QtObject as the +application's root element. + +\section2 Native Widgets +The native widgets application is based on \l{QWidget}s. In contrast to the other applications +which are QML applications, this one uses the "native" runtime. Consequently, the application's +entry point isn't a main QML file, but an executable. It is probably the most basic application, +that still adheres to this particular System UI. It is just for illustrating the concept: the +System UI needs a \c type window property to differentiate between normal windows and popups. Note +that this works only in multi-process mode; naturally, application processes cannot be started in +single-process mode. +\endlist + +\section1 Code Structure +In contrast to other application manager examples, which are purely based on QML, this example +needs to be built necessarily. The code is structured in a way, that the resulting application +folders only contain the needed artifacts to run the application. Hence they could be packaged and +installed, as well (for instance to the \l{Desktop System UI Example}). + +*/ |