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
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
|
/****************************************************************************
**
** Copyright (C) 2014 Sze Howe Koh <szehowe.koh@gmail.com>
** Contact: http://www.qt-project.org/legal
**
** This file is part of the documentation of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
** of its contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QtWidgets>
class DemoWidget : public QWidget {
Q_OBJECT
public:
DemoWidget(QWidget *parent = nullptr);
void demoImplicitConversion();
void demoTypeResolution();
void demoCrossLanguageConnect();
void demoOverloadConnect();
//! [defaultparams]
public slots:
void printNumber(int number = 42) {
qDebug() << "Lucky number" << number;
}
//! [defaultparams]
};
//! [lambda]
class TextSender : public QWidget {
Q_OBJECT
QLineEdit *lineEdit;
QPushButton *button;
signals:
void textCompleted(const QString& text) const;
public:
TextSender(QWidget *parent = nullptr);
};
//! [lambda]
//! [crosslanguage]
class CppGui : public QWidget {
Q_OBJECT
QPushButton *button;
signals:
void cppSignal(const QVariant& sentMsg) const;
public slots:
void cppSlot(const QString& receivedMsg) const {
qDebug() << "C++ received:" << receivedMsg;
}
public:
CppGui(QWidget *parent = nullptr) : QWidget(parent) {
button = new QPushButton("Click Me!", this);
connect(button, &QPushButton::clicked, [=] {
emit cppSignal("Hello from C++!");
});
}
};
//! [crosslanguage]
|
