1/****************************************************************************
2**
3** Copyright (C) 2017 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 "radio.h"
52
53Radio::Radio()
54{
55 radio = new QRadioTuner;
56 connect(sender: radio, signal: QOverload<QRadioTuner::Error>::of(ptr: &QRadioTuner::error),
57 receiver: this, slot: QOverload<QRadioTuner::Error>::of(ptr: &Radio::error));
58
59 if (radio->isBandSupported(b: QRadioTuner::FM))
60 radio->setBand(QRadioTuner::FM);
61
62 QWidget *window = new QWidget;
63 QVBoxLayout *layout = new QVBoxLayout;
64 QHBoxLayout *buttonBar = new QHBoxLayout;
65 QHBoxLayout *topBar = new QHBoxLayout;
66
67 layout->addLayout(layout: topBar);
68
69 freq = new QLabel;
70 freq->setText(QString("%1 kHz").arg(a: radio->frequency()/1000));
71 topBar->addWidget(freq);
72 connect(sender: radio, signal: &QRadioTuner::frequencyChanged,
73 receiver: this, slot: &Radio::freqChanged);
74
75 signal = new QLabel;
76 if (radio->isAvailable())
77 signal->setText(tr(s: "No Signal"));
78 else
79 signal->setText(tr(s: "No radio found"));
80 topBar->addWidget(signal);
81 connect(sender: radio, signal: &QRadioTuner::signalStrengthChanged,
82 receiver: this, slot: &Radio::signalChanged);
83
84 volumeSlider = new QSlider(Qt::Vertical,this);
85 volumeSlider->setRange(min: 0, max: 100);
86 volumeSlider->setValue(50);
87 connect(sender: volumeSlider, signal: &QSlider::valueChanged,
88 receiver: this, slot: &Radio::updateVolume);
89 topBar->addWidget(volumeSlider);
90
91 layout->addLayout(layout: buttonBar);
92
93 searchLeft = new QPushButton;
94 searchLeft->setText(tr(s: "scan Down"));
95 connect(sender: searchLeft, signal: &QPushButton::clicked,
96 receiver: this, slot: &Radio::searchDown);
97 buttonBar->addWidget(searchLeft);
98
99 left = new QPushButton;
100 left->setText(tr(s: "Freq Down"));
101 connect(sender: left, signal: &QPushButton::clicked,
102 receiver: this, slot: &Radio::freqDown);
103 buttonBar->addWidget(left);
104
105 right = new QPushButton;
106 connect(sender: right, signal: &QPushButton::clicked,
107 receiver: this, slot: &Radio::freqUp);
108 right->setText(tr(s: "Freq Up"));
109 buttonBar->addWidget(right);
110
111 searchRight = new QPushButton;
112 searchRight->setText(tr(s: "scan Up"));
113 connect(sender: searchRight, signal: &QPushButton::clicked,
114 receiver: this, slot: &Radio::searchUp);
115 buttonBar->addWidget(searchRight);
116
117 window->setLayout(layout);
118 setCentralWidget(window);
119 window->show();
120
121 radio->start();
122}
123
124Radio::~Radio()
125{
126}
127
128void Radio::freqUp()
129{
130 int f = radio->frequency();
131 f += radio->frequencyStep(band: QRadioTuner::FM);
132 radio->setFrequency(f);
133}
134
135void Radio::freqDown()
136{
137 int f = radio->frequency();
138 f -= radio->frequencyStep(band: QRadioTuner::FM);
139 radio->setFrequency(f);
140}
141
142void Radio::searchUp()
143{
144 radio->searchForward();
145}
146
147void Radio::searchDown()
148{
149 radio->searchBackward();
150}
151
152void Radio::freqChanged(int)
153{
154 freq->setText(QString("%1 kHz").arg(a: radio->frequency()/1000));
155}
156
157void Radio::signalChanged(int)
158{
159 if(radio->signalStrength() > 25)
160 signal->setText(tr(s: "Got Signal"));
161 else
162 signal->setText(tr(s: "No Signal"));
163}
164
165void Radio::updateVolume(int v)
166{
167 radio->setVolume(v);
168}
169
170void Radio::error(QRadioTuner::Error error)
171{
172 const QMetaObject *metaObj = radio->metaObject();
173 QMetaEnum errorEnum = metaObj->enumerator(index: metaObj->indexOfEnumerator(name: "Error"));
174 qWarning().nospace() << "Warning: Example application received error QRadioTuner::" << errorEnum.valueToKey(value: error);
175}
176
177

source code of qtmultimedia/examples/multimedia/radio/radio.cpp