blob: 49ca73797481474952c27caa07b213a9a8285609 (
plain)
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
69
70
71
72
73
74
75
76
77
78
79
80
|
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the documentation of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.1, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QLabel>
#include <QPushButton>
#include "qtcast.h"
MyWidget::MyWidget()
{
//! [0]
QObject *obj = new MyWidget;
//! [0]
//! [1]
QWidget *widget = qobject_cast<QWidget *>(obj);
//! [1]
//! [2]
MyWidget *myWidget = qobject_cast<MyWidget *>(obj);
//! [2]
//! [3]
QLabel *label = qobject_cast<QLabel *>(obj);
//! [3] //! [4]
// label is 0
//! [4]
//! [5]
if (QLabel *label = qobject_cast<QLabel *>(obj)) {
//! [5] //! [6]
label->setText(tr("Ping"));
} else if (QPushButton *button = qobject_cast<QPushButton *>(obj)) {
button->setText(tr("Pong!"));
}
//! [6]
}
int main()
{
return 0;
}
|
