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-/****************************************************************************
-**
-** Copyright (C) 2019 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.
-** $QT_END_LICENSE$
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-****************************************************************************/
-
-/*!
-    \example webengine/lifecycle
-    \title WebEngine Lifecycle Example
-    \ingroup webengine-examples
-    \brief Freezes and discards background tabs to reduce CPU and memory usage.
-
-    \image lifecycle.png
-
-    \e {WebEngine Lifecycle Example} demonstrates how the \l
-    {WebEngineView::}{lifecycleState} and \l {WebEngineView::}{recommendedState}
-    properties of the \l {WebEngineView} can be used to reduce the CPU and
-    memory usage of background tabs in a tabbed browser.
-
-    For an overview of the lifecycle feature, see \l {Page Lifecycle API}.
-
-    \include examples-run.qdocinc
-
-    \section1 UI Elements of the Example
-
-    The example uses \l {Qt Quick Controls 2} to implement a traditional tabbed
-    browser in the \l {Material Style} (dark variant). The main application
-    window (\c {WebBrowser.qml}) is divided into a header bar at the top and a
-    main viewing area filling the rest of the window. The header contains the
-    tab bar (\c {WebTabBar.qml}) with one button per tab (\c
-    {WebTabButton.qml}). The main area consists of a stack of tabs (\c
-    {WebTabStack.qml} and \c {WebTab.qml}). Each tab in turn has a tool bar at
-    the top and a \l {WebEngineView} for displaying web pages. Finally, the main
-    window also has a \l {Drawer} for changing settings. The drawer can be
-    opened by clicking the "⋮" button on the tool bar.
-
-    \section1 Lifecycle States in the Example
-
-    The example implements two ways of changing the lifecycle state: manual and
-    automatic. The manual way uses the \l {WebEngineView::}{lifecycleState}
-    property directly to change the web view lifecycle state, while the
-    automatic way is timer-based and also takes into account the \l
-    {WebEngineView::}{recommendedState}.
-
-    The tab titles in the tab bar are color coded with frozen tabs shown in blue
-    and discarded in red.
-
-    \section2 Manual Lifecycle Control
-
-    \image lifecycle-manual.png
-
-    Manual control is provided by context menus on the tab bar buttons (\c
-    {WebTabButton.qml}). The menu has three radio buttons, one for each
-    lifecycle state, with the current state checked. Some buttons may be
-    disabled, either because they represent illegal state transitions (for
-    example, a \c {Discarded} view cannot directly transition to the \c {Frozen}
-    state), or because other preconditions are not fulfilled (for example, a
-    visible view can only be in the \c {Active} state).
-
-    \section2 Automatic Lifecycle Control
-
-    \image lifecycle-automatic.png
-
-    Automatic control is implemented with a \l {Timer} in the \c {WebTab}
-    component (\c {WebTab.qml}). The timer is started whenever the \l
-    {WebEngineView::}{lifecycleState} of the web view does not match it's \l
-    {WebEngineView::}{recommendedState}. Once the timer fires, the view's
-    lifecycle state is set to the recommended state.
-
-    The time delay is used to avoid changing the lifecycle state too quickly
-    when the user is switching between tabs. The freezing and discarding delays
-    can be changed in the settings drawer accessed through the "⋮" button on the
-    tool bar.
-
-    This is a rather simple algorithm for automatic lifecycle control, however
-    more sophisticated algorithms could also be conceived and implemented on the
-    basis of the \l {WebEngineView::}{lifecycleState} property. For example, the
-    Chromium browser experimentally uses a pretrained deep neural network to
-    predict the next tab activation time by the user, essentially ranking tabs
-    based on how interesting they are to the user. Implementing such an
-    algorithm is left as an exercise to the reader for now.
-
-*/