/**************************************************************************** ** ** Copyright (C) 2017 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. ** $QT_END_LICENSE$ ** ****************************************************************************/ /*! \title Qt Quick Examples - Threading \example threading \brief This is a collection of QML multithreading examples. \image qml-threading-example.png \ingroup qtquickexamples \e Threading is a collection of QML multithreading examples. \include examples-run.qdocinc \section1 Threaded ListModel \e{Threaded ListModel} contains a \l ListView and a \l ListModel. The ListModel object is updated asynchronously in another thread, and the results propagate back to the main thread. A timer requests updates from the worker thread periodically: \snippet threading/threadedlistmodel/timedisplay.qml 0 Inside the worker thread, the ListModel is synchronized once the data is finished loading: \snippet threading/threadedlistmodel/dataloader.mjs 0 \section1 WorkerScript \e WorkerScript contains an example of using a \l WorkerScript to offload expensive calculations into another thread. This keeps the UI from being blocked. This example calculates numbers in Pascal's Triangle, and not in a very optimal way, so it will often take several seconds to complete the calculation. By doing this in a WorkerScript in another thread, the UI is not blocked during this time. When the UI needs another value, a request is sent to the WorkerScript: \snippet threading/workerscript/workerscript.qml 0 The workerscript then is free to take a really long time to calculate it: \snippet threading/workerscript/workerscript.mjs 0 When it's done, the result returns to the main scene via the WorkerScript type: \snippet threading/workerscript/workerscript.qml 1 */