1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
|
/****************************************************************************
**
** 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
*/
|
