1/****************************************************************************
2**
3** Copyright (C) 2016 The Qt Company Ltd.
4** Contact: https://www.qt.io/licensing/
5**
6** This file is part of the examples of the Qt Toolkit.
7**
8** $QT_BEGIN_LICENSE:BSD$
9** Commercial License Usage
10** Licensees holding valid commercial Qt licenses may use this file in
11** accordance with the commercial license agreement provided with the
12** Software or, alternatively, in accordance with the terms contained in
13** a written agreement between you and The Qt Company. For licensing terms
14** and conditions see https://www.qt.io/terms-conditions. For further
15** information use the contact form at https://www.qt.io/contact-us.
16**
17** BSD License Usage
18** Alternatively, you may use this file under the terms of the BSD license
19** as follows:
20**
21** "Redistribution and use in source and binary forms, with or without
22** modification, are permitted provided that the following conditions are
23** met:
24** * Redistributions of source code must retain the above copyright
25** notice, this list of conditions and the following disclaimer.
26** * Redistributions in binary form must reproduce the above copyright
27** notice, this list of conditions and the following disclaimer in
28** the documentation and/or other materials provided with the
29** distribution.
30** * Neither the name of The Qt Company Ltd nor the names of its
31** contributors may be used to endorse or promote products derived
32** from this software without specific prior written permission.
33**
34**
35** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
36** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
37** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
38** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
39** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
40** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
41** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
42** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
43** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
44** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
45** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
46**
47** $QT_END_LICENSE$
48**
49****************************************************************************/
50
51#include "mymodel.h"
52
53#include <QTime>
54
55//! [quoting mymodel_a]
56MyModel::MyModel(QObject *parent)
57 : QAbstractTableModel(parent)
58 , timer(new QTimer(this))
59{
60 timer->setInterval(1000);
61 connect(sender: timer, signal: &QTimer::timeout , receiver: this, slot: &MyModel::timerHit);
62 timer->start();
63}
64//! [quoting mymodel_a]
65//-------------------------------------------------------
66int MyModel::rowCount(const QModelIndex & /*parent */) const
67{
68 return 2;
69}
70
71//-------------------------------------------------------
72int MyModel::columnCount(const QModelIndex & /*parent */) const
73{
74 return 3;
75}
76
77//-------------------------------------------------------
78//! [quoting mymodel_QVariant ]
79QVariant MyModel::data(const QModelIndex &index, int role) const
80{
81 int row = index.row();
82 int col = index.column();
83
84 if (role == Qt::DisplayRole && row == 0 && col == 0)
85 return QTime::currentTime().toString();
86
87 return QVariant();
88}
89//! [quoting mymodel_QVariant ]
90//-------------------------------------------------------
91//! [quoting mymodel_b ]
92void MyModel::timerHit()
93{
94 //we identify the top left cell
95 QModelIndex topLeft = createIndex(arow: 0,acolumn: 0);
96 //emit a signal to make the view reread identified data
97 emit dataChanged(topLeft, bottomRight: topLeft, roles: {Qt::DisplayRole});
98}
99//! [quoting mymodel_b ]
100

source code of qtbase/examples/widgets/tutorials/modelview/3_changingmodel/mymodel.cpp