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<h1 class="title">mainwidget.cpp Example File</h1>
<span class="subtitle">multimedia/spectrum/app/mainwidget.cpp</span>
<!-- $$$multimedia/spectrum/app/mainwidget.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp">
<span class="comment">/****************************************************************************
**
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** 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.
**
** BSD License Usage
** Alternatively, 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 The Qt Company Ltd 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."
**
** $QT_END_LICENSE$
**
****************************************************************************/</span>
<span class="preprocessor">#include "engine.h"</span>
<span class="preprocessor">#include "levelmeter.h"</span>
<span class="preprocessor">#include "mainwidget.h"</span>
<span class="preprocessor">#include "waveform.h"</span>
<span class="preprocessor">#include "progressbar.h"</span>
<span class="preprocessor">#include "settingsdialog.h"</span>
<span class="preprocessor">#include "spectrograph.h"</span>
<span class="preprocessor">#include "tonegeneratordialog.h"</span>
<span class="preprocessor">#include "utils.h"</span>
<span class="preprocessor">#include <QLabel></span>
<span class="preprocessor">#include <QPushButton></span>
<span class="preprocessor">#include <QHBoxLayout></span>
<span class="preprocessor">#include <QVBoxLayout></span>
<span class="preprocessor">#include <QStyle></span>
<span class="preprocessor">#include <QMenu></span>
<span class="preprocessor">#include <QFileDialog></span>
<span class="preprocessor">#include <QTimerEvent></span>
<span class="preprocessor">#include <QMessageBox></span>
<span class="keyword">const</span> <span class="type">int</span> NullTimerId <span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>;
MainWidget<span class="operator">::</span>MainWidget(<span class="type">QWidget</span> <span class="operator">*</span>parent)
: <span class="type">QWidget</span>(parent)
<span class="operator">,</span> m_mode(NoMode)
<span class="operator">,</span> m_engine(<span class="keyword">new</span> Engine(<span class="keyword">this</span>))
<span class="preprocessor">#ifndef DISABLE_WAVEFORM</span>
<span class="operator">,</span> m_waveform(<span class="keyword">new</span> Waveform(<span class="keyword">this</span>))
<span class="preprocessor">#endif</span>
<span class="operator">,</span> m_progressBar(<span class="keyword">new</span> ProgressBar(<span class="keyword">this</span>))
<span class="operator">,</span> m_spectrograph(<span class="keyword">new</span> Spectrograph(<span class="keyword">this</span>))
<span class="operator">,</span> m_levelMeter(<span class="keyword">new</span> LevelMeter(<span class="keyword">this</span>))
<span class="operator">,</span> m_modeButton(<span class="keyword">new</span> <span class="type">QPushButton</span>(<span class="keyword">this</span>))
<span class="operator">,</span> m_recordButton(<span class="keyword">new</span> <span class="type">QPushButton</span>(<span class="keyword">this</span>))
<span class="operator">,</span> m_pauseButton(<span class="keyword">new</span> <span class="type">QPushButton</span>(<span class="keyword">this</span>))
<span class="operator">,</span> m_playButton(<span class="keyword">new</span> <span class="type">QPushButton</span>(<span class="keyword">this</span>))
<span class="operator">,</span> m_settingsButton(<span class="keyword">new</span> <span class="type">QPushButton</span>(<span class="keyword">this</span>))
<span class="operator">,</span> m_infoMessage(<span class="keyword">new</span> <span class="type">QLabel</span>(tr(<span class="string">"Select a mode to begin"</span>)<span class="operator">,</span> <span class="keyword">this</span>))
<span class="operator">,</span> m_infoMessageTimerId(NullTimerId)
<span class="operator">,</span> m_settingsDialog(<span class="keyword">new</span> SettingsDialog(
m_engine<span class="operator">-</span><span class="operator">></span>availableAudioInputDevices()<span class="operator">,</span>
m_engine<span class="operator">-</span><span class="operator">></span>availableAudioOutputDevices()<span class="operator">,</span>
<span class="keyword">this</span>))
<span class="operator">,</span> m_toneGeneratorDialog(<span class="keyword">new</span> ToneGeneratorDialog(<span class="keyword">this</span>))
<span class="operator">,</span> m_modeMenu(<span class="keyword">new</span> <span class="type">QMenu</span>(<span class="keyword">this</span>))
<span class="operator">,</span> m_loadFileAction(<span class="number">0</span>)
<span class="operator">,</span> m_generateToneAction(<span class="number">0</span>)
<span class="operator">,</span> m_recordAction(<span class="number">0</span>)
{
m_spectrograph<span class="operator">-</span><span class="operator">></span>setParams(SpectrumNumBands<span class="operator">,</span> SpectrumLowFreq<span class="operator">,</span> SpectrumHighFreq);
createUi();
connectUi();
}
MainWidget<span class="operator">::</span><span class="operator">~</span>MainWidget()
{
}
<span class="comment">//-----------------------------------------------------------------------------</span>
<span class="comment">// Public slots</span>
<span class="comment">//-----------------------------------------------------------------------------</span>
<span class="type">void</span> MainWidget<span class="operator">::</span>stateChanged(<span class="type"><a href="qaudio.html">QAudio</a></span><span class="operator">::</span>Mode mode<span class="operator">,</span> <span class="type"><a href="qaudio.html">QAudio</a></span><span class="operator">::</span>State state)
{
Q_UNUSED(mode);
updateButtonStates();
<span class="keyword">if</span> (<span class="type"><a href="qaudio.html">QAudio</a></span><span class="operator">::</span>ActiveState <span class="operator">!</span><span class="operator">=</span> state <span class="operator">&</span><span class="operator">&</span> <span class="type"><a href="qaudio.html">QAudio</a></span><span class="operator">::</span>SuspendedState <span class="operator">!</span><span class="operator">=</span> state) {
m_levelMeter<span class="operator">-</span><span class="operator">></span>reset();
m_spectrograph<span class="operator">-</span><span class="operator">></span>reset();
}
}
<span class="type">void</span> MainWidget<span class="operator">::</span>formatChanged(<span class="keyword">const</span> <span class="type"><a href="qaudioformat.html">QAudioFormat</a></span> <span class="operator">&</span>format)
{
infoMessage(formatToString(format)<span class="operator">,</span> NullMessageTimeout);
<span class="preprocessor">#ifndef DISABLE_WAVEFORM</span>
<span class="keyword">if</span> (<span class="type"><a href="qaudioformat.html">QAudioFormat</a></span>() <span class="operator">!</span><span class="operator">=</span> format) {
m_waveform<span class="operator">-</span><span class="operator">></span>initialize(format<span class="operator">,</span> WaveformTileLength<span class="operator">,</span>
WaveformWindowDuration);
}
<span class="preprocessor">#endif</span>
}
<span class="type">void</span> MainWidget<span class="operator">::</span>spectrumChanged(<span class="type">qint64</span> position<span class="operator">,</span> <span class="type">qint64</span> length<span class="operator">,</span>
<span class="keyword">const</span> FrequencySpectrum <span class="operator">&</span>spectrum)
{
m_progressBar<span class="operator">-</span><span class="operator">></span>windowChanged(position<span class="operator">,</span> length);
m_spectrograph<span class="operator">-</span><span class="operator">></span>spectrumChanged(spectrum);
}
<span class="type">void</span> MainWidget<span class="operator">::</span>infoMessage(<span class="keyword">const</span> <span class="type">QString</span> <span class="operator">&</span>message<span class="operator">,</span> <span class="type">int</span> timeoutMs)
{
m_infoMessage<span class="operator">-</span><span class="operator">></span>setText(message);
<span class="keyword">if</span> (NullTimerId <span class="operator">!</span><span class="operator">=</span> m_infoMessageTimerId) {
killTimer(m_infoMessageTimerId);
m_infoMessageTimerId <span class="operator">=</span> NullTimerId;
}
<span class="keyword">if</span> (NullMessageTimeout <span class="operator">!</span><span class="operator">=</span> timeoutMs)
m_infoMessageTimerId <span class="operator">=</span> startTimer(timeoutMs);
}
<span class="type">void</span> MainWidget<span class="operator">::</span>errorMessage(<span class="keyword">const</span> <span class="type">QString</span> <span class="operator">&</span>heading<span class="operator">,</span> <span class="keyword">const</span> <span class="type">QString</span> <span class="operator">&</span>detail)
{
<span class="type">QMessageBox</span><span class="operator">::</span>warning(<span class="keyword">this</span><span class="operator">,</span> heading<span class="operator">,</span> detail<span class="operator">,</span> <span class="type">QMessageBox</span><span class="operator">::</span>Close);
}
<span class="type">void</span> MainWidget<span class="operator">::</span>timerEvent(<span class="type">QTimerEvent</span> <span class="operator">*</span>event)
{
Q_ASSERT(event<span class="operator">-</span><span class="operator">></span>timerId() <span class="operator">=</span><span class="operator">=</span> m_infoMessageTimerId);
Q_UNUSED(event) <span class="comment">// suppress warnings in release builds</span>
killTimer(m_infoMessageTimerId);
m_infoMessageTimerId <span class="operator">=</span> NullTimerId;
m_infoMessage<span class="operator">-</span><span class="operator">></span>setText(<span class="string">""</span>);
}
<span class="type">void</span> MainWidget<span class="operator">::</span>audioPositionChanged(<span class="type">qint64</span> position)
{
<span class="preprocessor">#ifndef DISABLE_WAVEFORM</span>
m_waveform<span class="operator">-</span><span class="operator">></span>audioPositionChanged(position);
<span class="preprocessor">#else</span>
Q_UNUSED(position)
<span class="preprocessor">#endif</span>
}
<span class="type">void</span> MainWidget<span class="operator">::</span>bufferLengthChanged(<span class="type">qint64</span> length)
{
m_progressBar<span class="operator">-</span><span class="operator">></span>bufferLengthChanged(length);
}
<span class="comment">//-----------------------------------------------------------------------------</span>
<span class="comment">// Private slots</span>
<span class="comment">//-----------------------------------------------------------------------------</span>
<span class="type">void</span> MainWidget<span class="operator">::</span>showFileDialog()
{
<span class="keyword">const</span> <span class="type">QString</span> dir;
<span class="keyword">const</span> <span class="type">QStringList</span> fileNames <span class="operator">=</span> <span class="type">QFileDialog</span><span class="operator">::</span>getOpenFileNames(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">"Open WAV file"</span>)<span class="operator">,</span> dir<span class="operator">,</span> <span class="string">"*.wav"</span>);
<span class="keyword">if</span> (fileNames<span class="operator">.</span>count()) {
reset();
setMode(LoadFileMode);
m_engine<span class="operator">-</span><span class="operator">></span>loadFile(fileNames<span class="operator">.</span>front());
updateButtonStates();
} <span class="keyword">else</span> {
updateModeMenu();
}
}
<span class="type">void</span> MainWidget<span class="operator">::</span>showSettingsDialog()
{
m_settingsDialog<span class="operator">-</span><span class="operator">></span>exec();
<span class="keyword">if</span> (m_settingsDialog<span class="operator">-</span><span class="operator">></span>result() <span class="operator">=</span><span class="operator">=</span> <span class="type">QDialog</span><span class="operator">::</span>Accepted) {
m_engine<span class="operator">-</span><span class="operator">></span>setAudioInputDevice(m_settingsDialog<span class="operator">-</span><span class="operator">></span>inputDevice());
m_engine<span class="operator">-</span><span class="operator">></span>setAudioOutputDevice(m_settingsDialog<span class="operator">-</span><span class="operator">></span>outputDevice());
m_engine<span class="operator">-</span><span class="operator">></span>setWindowFunction(m_settingsDialog<span class="operator">-</span><span class="operator">></span>windowFunction());
}
}
<span class="type">void</span> MainWidget<span class="operator">::</span>showToneGeneratorDialog()
{
m_toneGeneratorDialog<span class="operator">-</span><span class="operator">></span>exec();
<span class="keyword">if</span> (m_toneGeneratorDialog<span class="operator">-</span><span class="operator">></span>result() <span class="operator">=</span><span class="operator">=</span> <span class="type">QDialog</span><span class="operator">::</span>Accepted) {
reset();
setMode(GenerateToneMode);
<span class="keyword">const</span> <span class="type">qreal</span> amplitude <span class="operator">=</span> m_toneGeneratorDialog<span class="operator">-</span><span class="operator">></span>amplitude();
<span class="keyword">if</span> (m_toneGeneratorDialog<span class="operator">-</span><span class="operator">></span>isFrequencySweepEnabled()) {
m_engine<span class="operator">-</span><span class="operator">></span>generateSweptTone(amplitude);
} <span class="keyword">else</span> {
<span class="keyword">const</span> <span class="type">qreal</span> frequency <span class="operator">=</span> m_toneGeneratorDialog<span class="operator">-</span><span class="operator">></span>frequency();
<span class="keyword">const</span> Tone tone(frequency<span class="operator">,</span> amplitude);
m_engine<span class="operator">-</span><span class="operator">></span>generateTone(tone);
updateButtonStates();
}
} <span class="keyword">else</span> {
updateModeMenu();
}
}
<span class="type">void</span> MainWidget<span class="operator">::</span>initializeRecord()
{
reset();
setMode(RecordMode);
<span class="keyword">if</span> (m_engine<span class="operator">-</span><span class="operator">></span>initializeRecord())
updateButtonStates();
}
<span class="comment">//-----------------------------------------------------------------------------</span>
<span class="comment">// Private functions</span>
<span class="comment">//-----------------------------------------------------------------------------</span>
<span class="type">void</span> MainWidget<span class="operator">::</span>createUi()
{
createMenus();
setWindowTitle(tr(<span class="string">"Spectrum Analyser"</span>));
<span class="type">QVBoxLayout</span> <span class="operator">*</span>windowLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QVBoxLayout</span>(<span class="keyword">this</span>);
m_infoMessage<span class="operator">-</span><span class="operator">></span>setSizePolicy(<span class="type">QSizePolicy</span><span class="operator">::</span>Preferred<span class="operator">,</span> <span class="type">QSizePolicy</span><span class="operator">::</span>Fixed);
m_infoMessage<span class="operator">-</span><span class="operator">></span>setAlignment(<span class="type">Qt</span><span class="operator">::</span>AlignHCenter);
windowLayout<span class="operator">-</span><span class="operator">></span>addWidget(m_infoMessage);
<span class="preprocessor">#ifdef SUPERIMPOSE_PROGRESS_ON_WAVEFORM</span>
<span class="type">QScopedPointer</span><span class="operator"><</span><span class="type">QHBoxLayout</span><span class="operator">></span> waveformLayout(<span class="keyword">new</span> <span class="type">QHBoxLayout</span>);
waveformLayout<span class="operator">-</span><span class="operator">></span>addWidget(m_progressBar);
m_progressBar<span class="operator">-</span><span class="operator">></span>setMinimumHeight(m_waveform<span class="operator">-</span><span class="operator">></span>minimumHeight());
waveformLayout<span class="operator">-</span><span class="operator">></span>setMargin(<span class="number">0</span>);
m_waveform<span class="operator">-</span><span class="operator">></span>setLayout(waveformLayout<span class="operator">.</span>data());
waveformLayout<span class="operator">.</span>take();
windowLayout<span class="operator">-</span><span class="operator">></span>addWidget(m_waveform);
<span class="preprocessor">#else</span>
<span class="preprocessor">#ifndef DISABLE_WAVEFORM</span>
windowLayout<span class="operator">-</span><span class="operator">></span>addWidget(m_waveform);
<span class="preprocessor">#endif // DISABLE_WAVEFORM</span>
windowLayout<span class="operator">-</span><span class="operator">></span>addWidget(m_progressBar);
<span class="preprocessor">#endif // SUPERIMPOSE_PROGRESS_ON_WAVEFORM</span>
<span class="comment">// Spectrograph and level meter</span>
<span class="type">QScopedPointer</span><span class="operator"><</span><span class="type">QHBoxLayout</span><span class="operator">></span> analysisLayout(<span class="keyword">new</span> <span class="type">QHBoxLayout</span>);
analysisLayout<span class="operator">-</span><span class="operator">></span>addWidget(m_spectrograph);
analysisLayout<span class="operator">-</span><span class="operator">></span>addWidget(m_levelMeter);
windowLayout<span class="operator">-</span><span class="operator">></span>addLayout(analysisLayout<span class="operator">.</span>data());
analysisLayout<span class="operator">.</span>take();
<span class="comment">// Button panel</span>
<span class="keyword">const</span> <span class="type">QSize</span> buttonSize(<span class="number">30</span><span class="operator">,</span> <span class="number">30</span>);
m_modeButton<span class="operator">-</span><span class="operator">></span>setText(tr(<span class="string">"Mode"</span>));
m_recordIcon <span class="operator">=</span> <span class="type">QIcon</span>(<span class="string">":/images/record.png"</span>);
m_recordButton<span class="operator">-</span><span class="operator">></span>setIcon(m_recordIcon);
m_recordButton<span class="operator">-</span><span class="operator">></span>setEnabled(<span class="keyword">false</span>);
m_recordButton<span class="operator">-</span><span class="operator">></span>setSizePolicy(<span class="type">QSizePolicy</span><span class="operator">::</span>Fixed<span class="operator">,</span> <span class="type">QSizePolicy</span><span class="operator">::</span>Fixed);
m_recordButton<span class="operator">-</span><span class="operator">></span>setMinimumSize(buttonSize);
m_pauseIcon <span class="operator">=</span> style()<span class="operator">-</span><span class="operator">></span>standardIcon(<span class="type">QStyle</span><span class="operator">::</span>SP_MediaPause);
m_pauseButton<span class="operator">-</span><span class="operator">></span>setIcon(m_pauseIcon);
m_pauseButton<span class="operator">-</span><span class="operator">></span>setEnabled(<span class="keyword">false</span>);
m_pauseButton<span class="operator">-</span><span class="operator">></span>setSizePolicy(<span class="type">QSizePolicy</span><span class="operator">::</span>Fixed<span class="operator">,</span> <span class="type">QSizePolicy</span><span class="operator">::</span>Fixed);
m_pauseButton<span class="operator">-</span><span class="operator">></span>setMinimumSize(buttonSize);
m_playIcon <span class="operator">=</span> style()<span class="operator">-</span><span class="operator">></span>standardIcon(<span class="type">QStyle</span><span class="operator">::</span>SP_MediaPlay);
m_playButton<span class="operator">-</span><span class="operator">></span>setIcon(m_playIcon);
m_playButton<span class="operator">-</span><span class="operator">></span>setEnabled(<span class="keyword">false</span>);
m_playButton<span class="operator">-</span><span class="operator">></span>setSizePolicy(<span class="type">QSizePolicy</span><span class="operator">::</span>Fixed<span class="operator">,</span> <span class="type">QSizePolicy</span><span class="operator">::</span>Fixed);
m_playButton<span class="operator">-</span><span class="operator">></span>setMinimumSize(buttonSize);
m_settingsIcon <span class="operator">=</span> <span class="type">QIcon</span>(<span class="string">":/images/settings.png"</span>);
m_settingsButton<span class="operator">-</span><span class="operator">></span>setIcon(m_settingsIcon);
m_settingsButton<span class="operator">-</span><span class="operator">></span>setEnabled(<span class="keyword">true</span>);
m_settingsButton<span class="operator">-</span><span class="operator">></span>setSizePolicy(<span class="type">QSizePolicy</span><span class="operator">::</span>Fixed<span class="operator">,</span> <span class="type">QSizePolicy</span><span class="operator">::</span>Fixed);
m_settingsButton<span class="operator">-</span><span class="operator">></span>setMinimumSize(buttonSize);
<span class="type">QScopedPointer</span><span class="operator"><</span><span class="type">QHBoxLayout</span><span class="operator">></span> buttonPanelLayout(<span class="keyword">new</span> <span class="type">QHBoxLayout</span>);
buttonPanelLayout<span class="operator">-</span><span class="operator">></span>addStretch();
buttonPanelLayout<span class="operator">-</span><span class="operator">></span>addWidget(m_modeButton);
buttonPanelLayout<span class="operator">-</span><span class="operator">></span>addWidget(m_recordButton);
buttonPanelLayout<span class="operator">-</span><span class="operator">></span>addWidget(m_pauseButton);
buttonPanelLayout<span class="operator">-</span><span class="operator">></span>addWidget(m_playButton);
buttonPanelLayout<span class="operator">-</span><span class="operator">></span>addWidget(m_settingsButton);
<span class="type">QWidget</span> <span class="operator">*</span>buttonPanel <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QWidget</span>(<span class="keyword">this</span>);
buttonPanel<span class="operator">-</span><span class="operator">></span>setSizePolicy(<span class="type">QSizePolicy</span><span class="operator">::</span>Fixed<span class="operator">,</span> <span class="type">QSizePolicy</span><span class="operator">::</span>Fixed);
buttonPanel<span class="operator">-</span><span class="operator">></span>setLayout(buttonPanelLayout<span class="operator">.</span>data());
buttonPanelLayout<span class="operator">.</span>take(); <span class="comment">// ownership transferred to buttonPanel</span>
<span class="type">QScopedPointer</span><span class="operator"><</span><span class="type">QHBoxLayout</span><span class="operator">></span> bottomPaneLayout(<span class="keyword">new</span> <span class="type">QHBoxLayout</span>);
bottomPaneLayout<span class="operator">-</span><span class="operator">></span>addWidget(buttonPanel);
windowLayout<span class="operator">-</span><span class="operator">></span>addLayout(bottomPaneLayout<span class="operator">.</span>data());
bottomPaneLayout<span class="operator">.</span>take(); <span class="comment">// ownership transferred to windowLayout</span>
<span class="comment">// Apply layout</span>
setLayout(windowLayout);
}
<span class="type">void</span> MainWidget<span class="operator">::</span>connectUi()
{
CHECKED_CONNECT(m_recordButton<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span>
m_engine<span class="operator">,</span> SLOT(startRecording()));
CHECKED_CONNECT(m_pauseButton<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span>
m_engine<span class="operator">,</span> SLOT(suspend()));
CHECKED_CONNECT(m_playButton<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span>
m_engine<span class="operator">,</span> SLOT(startPlayback()));
CHECKED_CONNECT(m_settingsButton<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(showSettingsDialog()));
CHECKED_CONNECT(m_engine<span class="operator">,</span> SIGNAL(stateChanged(<span class="type"><a href="qaudio.html">QAudio</a></span><span class="operator">::</span>Mode<span class="operator">,</span><span class="type"><a href="qaudio.html">QAudio</a></span><span class="operator">::</span>State))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(stateChanged(<span class="type"><a href="qaudio.html">QAudio</a></span><span class="operator">::</span>Mode<span class="operator">,</span><span class="type"><a href="qaudio.html">QAudio</a></span><span class="operator">::</span>State)));
CHECKED_CONNECT(m_engine<span class="operator">,</span> SIGNAL(formatChanged(<span class="keyword">const</span> <span class="type"><a href="qaudioformat.html">QAudioFormat</a></span> <span class="operator">&</span>))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(formatChanged(<span class="keyword">const</span> <span class="type"><a href="qaudioformat.html">QAudioFormat</a></span> <span class="operator">&</span>)));
m_progressBar<span class="operator">-</span><span class="operator">></span>bufferLengthChanged(m_engine<span class="operator">-</span><span class="operator">></span>bufferLength());
CHECKED_CONNECT(m_engine<span class="operator">,</span> SIGNAL(bufferLengthChanged(<span class="type">qint64</span>))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(bufferLengthChanged(<span class="type">qint64</span>)));
CHECKED_CONNECT(m_engine<span class="operator">,</span> SIGNAL(dataLengthChanged(<span class="type">qint64</span>))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(updateButtonStates()));
CHECKED_CONNECT(m_engine<span class="operator">,</span> SIGNAL(recordPositionChanged(<span class="type">qint64</span>))<span class="operator">,</span>
m_progressBar<span class="operator">,</span> SLOT(recordPositionChanged(<span class="type">qint64</span>)));
CHECKED_CONNECT(m_engine<span class="operator">,</span> SIGNAL(playPositionChanged(<span class="type">qint64</span>))<span class="operator">,</span>
m_progressBar<span class="operator">,</span> SLOT(playPositionChanged(<span class="type">qint64</span>)));
CHECKED_CONNECT(m_engine<span class="operator">,</span> SIGNAL(recordPositionChanged(<span class="type">qint64</span>))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(audioPositionChanged(<span class="type">qint64</span>)));
CHECKED_CONNECT(m_engine<span class="operator">,</span> SIGNAL(playPositionChanged(<span class="type">qint64</span>))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(audioPositionChanged(<span class="type">qint64</span>)));
CHECKED_CONNECT(m_engine<span class="operator">,</span> SIGNAL(levelChanged(<span class="type">qreal</span><span class="operator">,</span> <span class="type">qreal</span><span class="operator">,</span> <span class="type">int</span>))<span class="operator">,</span>
m_levelMeter<span class="operator">,</span> SLOT(levelChanged(<span class="type">qreal</span><span class="operator">,</span> <span class="type">qreal</span><span class="operator">,</span> <span class="type">int</span>)));
CHECKED_CONNECT(m_engine<span class="operator">,</span> SIGNAL(spectrumChanged(<span class="type">qint64</span><span class="operator">,</span> <span class="type">qint64</span><span class="operator">,</span> <span class="keyword">const</span> FrequencySpectrum <span class="operator">&</span>))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(spectrumChanged(<span class="type">qint64</span><span class="operator">,</span> <span class="type">qint64</span><span class="operator">,</span> <span class="keyword">const</span> FrequencySpectrum <span class="operator">&</span>)));
CHECKED_CONNECT(m_engine<span class="operator">,</span> SIGNAL(infoMessage(<span class="type">QString</span><span class="operator">,</span> <span class="type">int</span>))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(infoMessage(<span class="type">QString</span><span class="operator">,</span> <span class="type">int</span>)));
CHECKED_CONNECT(m_engine<span class="operator">,</span> SIGNAL(errorMessage(<span class="type">QString</span><span class="operator">,</span> <span class="type">QString</span>))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(errorMessage(<span class="type">QString</span><span class="operator">,</span> <span class="type">QString</span>)));
CHECKED_CONNECT(m_spectrograph<span class="operator">,</span> SIGNAL(infoMessage(<span class="type">QString</span><span class="operator">,</span> <span class="type">int</span>))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(infoMessage(<span class="type">QString</span><span class="operator">,</span> <span class="type">int</span>)));
<span class="preprocessor">#ifndef DISABLE_WAVEFORM</span>
CHECKED_CONNECT(m_engine<span class="operator">,</span> SIGNAL(bufferChanged(<span class="type">qint64</span><span class="operator">,</span> <span class="type">qint64</span><span class="operator">,</span> <span class="keyword">const</span> <span class="type">QByteArray</span> <span class="operator">&</span>))<span class="operator">,</span>
m_waveform<span class="operator">,</span> SLOT(bufferChanged(<span class="type">qint64</span><span class="operator">,</span> <span class="type">qint64</span><span class="operator">,</span> <span class="keyword">const</span> <span class="type">QByteArray</span> <span class="operator">&</span>)));
<span class="preprocessor">#endif</span>
}
<span class="type">void</span> MainWidget<span class="operator">::</span>createMenus()
{
m_modeButton<span class="operator">-</span><span class="operator">></span>setMenu(m_modeMenu);
m_generateToneAction <span class="operator">=</span> m_modeMenu<span class="operator">-</span><span class="operator">></span>addAction(tr(<span class="string">"Play generated tone"</span>));
m_recordAction <span class="operator">=</span> m_modeMenu<span class="operator">-</span><span class="operator">></span>addAction(tr(<span class="string">"Record and play back"</span>));
m_loadFileAction <span class="operator">=</span> m_modeMenu<span class="operator">-</span><span class="operator">></span>addAction(tr(<span class="string">"Play file"</span>));
m_loadFileAction<span class="operator">-</span><span class="operator">></span>setCheckable(<span class="keyword">true</span>);
m_generateToneAction<span class="operator">-</span><span class="operator">></span>setCheckable(<span class="keyword">true</span>);
m_recordAction<span class="operator">-</span><span class="operator">></span>setCheckable(<span class="keyword">true</span>);
connect(m_loadFileAction<span class="operator">,</span> SIGNAL(triggered(bool))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(showFileDialog()));
connect(m_generateToneAction<span class="operator">,</span> SIGNAL(triggered(bool))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(showToneGeneratorDialog()));
connect(m_recordAction<span class="operator">,</span> SIGNAL(triggered(bool))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(initializeRecord()));
}
<span class="type">void</span> MainWidget<span class="operator">::</span>updateButtonStates()
{
<span class="keyword">const</span> bool recordEnabled <span class="operator">=</span> ((<span class="type"><a href="qaudio.html">QAudio</a></span><span class="operator">::</span>AudioOutput <span class="operator">=</span><span class="operator">=</span> m_engine<span class="operator">-</span><span class="operator">></span>mode() <span class="operator">|</span><span class="operator">|</span>
(<span class="type"><a href="qaudio.html">QAudio</a></span><span class="operator">::</span>ActiveState <span class="operator">!</span><span class="operator">=</span> m_engine<span class="operator">-</span><span class="operator">></span>state() <span class="operator">&</span><span class="operator">&</span>
<span class="type"><a href="qaudio.html">QAudio</a></span><span class="operator">::</span>IdleState <span class="operator">!</span><span class="operator">=</span> m_engine<span class="operator">-</span><span class="operator">></span>state())) <span class="operator">&</span><span class="operator">&</span>
RecordMode <span class="operator">=</span><span class="operator">=</span> m_mode);
m_recordButton<span class="operator">-</span><span class="operator">></span>setEnabled(recordEnabled);
<span class="keyword">const</span> bool pauseEnabled <span class="operator">=</span> (<span class="type"><a href="qaudio.html">QAudio</a></span><span class="operator">::</span>ActiveState <span class="operator">=</span><span class="operator">=</span> m_engine<span class="operator">-</span><span class="operator">></span>state() <span class="operator">|</span><span class="operator">|</span>
<span class="type"><a href="qaudio.html">QAudio</a></span><span class="operator">::</span>IdleState <span class="operator">=</span><span class="operator">=</span> m_engine<span class="operator">-</span><span class="operator">></span>state());
m_pauseButton<span class="operator">-</span><span class="operator">></span>setEnabled(pauseEnabled);
<span class="keyword">const</span> bool playEnabled <span class="operator">=</span> (<span class="comment">/*m_engine->dataLength() &&*/</span>
(<span class="type"><a href="qaudio.html">QAudio</a></span><span class="operator">::</span>AudioOutput <span class="operator">!</span><span class="operator">=</span> m_engine<span class="operator">-</span><span class="operator">></span>mode() <span class="operator">|</span><span class="operator">|</span>
(<span class="type"><a href="qaudio.html">QAudio</a></span><span class="operator">::</span>ActiveState <span class="operator">!</span><span class="operator">=</span> m_engine<span class="operator">-</span><span class="operator">></span>state() <span class="operator">&</span><span class="operator">&</span>
<span class="type"><a href="qaudio.html">QAudio</a></span><span class="operator">::</span>IdleState <span class="operator">!</span><span class="operator">=</span> m_engine<span class="operator">-</span><span class="operator">></span>state())));
m_playButton<span class="operator">-</span><span class="operator">></span>setEnabled(playEnabled);
}
<span class="type">void</span> MainWidget<span class="operator">::</span>reset()
{
<span class="preprocessor">#ifndef DISABLE_WAVEFORM</span>
m_waveform<span class="operator">-</span><span class="operator">></span>reset();
<span class="preprocessor">#endif</span>
m_engine<span class="operator">-</span><span class="operator">></span>reset();
m_levelMeter<span class="operator">-</span><span class="operator">></span>reset();
m_spectrograph<span class="operator">-</span><span class="operator">></span>reset();
m_progressBar<span class="operator">-</span><span class="operator">></span>reset();
}
<span class="type">void</span> MainWidget<span class="operator">::</span>setMode(Mode mode)
{
m_mode <span class="operator">=</span> mode;
updateModeMenu();
}
<span class="type">void</span> MainWidget<span class="operator">::</span>updateModeMenu()
{
m_loadFileAction<span class="operator">-</span><span class="operator">></span>setChecked(LoadFileMode <span class="operator">=</span><span class="operator">=</span> m_mode);
m_generateToneAction<span class="operator">-</span><span class="operator">></span>setChecked(GenerateToneMode <span class="operator">=</span><span class="operator">=</span> m_mode);
m_recordAction<span class="operator">-</span><span class="operator">></span>setChecked(RecordMode <span class="operator">=</span><span class="operator">=</span> m_mode);
}
</pre>
</div>
<!-- @@@multimedia/spectrum/app/mainwidget.cpp -->
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<acronym title="Copyright">©</acronym> 2017 The Qt Company Ltd.
Documentation contributions included herein are the copyrights of
their respective owners.<br> The documentation provided herein is licensed under the terms of the <a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation License version 1.3</a> as published by the Free Software Foundation.<br> Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property
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