mainwidget.cpp Example File

multimedia/spectrum/app/mainwidget.cpp
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#include "engine.h" #include "levelmeter.h" #include "mainwidget.h" #include "waveform.h" #include "progressbar.h" #include "settingsdialog.h" #include "spectrograph.h" #include "tonegeneratordialog.h" #include "utils.h" #include <QLabel> #include <QPushButton> #include <QHBoxLayout> #include <QVBoxLayout> #include <QStyle> #include <QMenu> #include <QFileDialog> #include <QTimerEvent> #include <QMessageBox> const int NullTimerId = -1; MainWidget::MainWidget(QWidget *parent) : QWidget(parent) , m_mode(NoMode) , m_engine(new Engine(this)) #ifndef DISABLE_WAVEFORM , m_waveform(new Waveform(this)) #endif , m_progressBar(new ProgressBar(this)) , m_spectrograph(new Spectrograph(this)) , m_levelMeter(new LevelMeter(this)) , m_modeButton(new QPushButton(this)) , m_recordButton(new QPushButton(this)) , m_pauseButton(new QPushButton(this)) , m_playButton(new QPushButton(this)) , m_settingsButton(new QPushButton(this)) , m_infoMessage(new QLabel(tr("Select a mode to begin"), this)) , m_infoMessageTimerId(NullTimerId) , m_settingsDialog(new SettingsDialog( m_engine->availableAudioInputDevices(), m_engine->availableAudioOutputDevices(), this)) , m_toneGeneratorDialog(new ToneGeneratorDialog(this)) , m_modeMenu(new QMenu(this)) , m_loadFileAction(0) , m_generateToneAction(0) , m_recordAction(0) { m_spectrograph->setParams(SpectrumNumBands, SpectrumLowFreq, SpectrumHighFreq); createUi(); connectUi(); } MainWidget::~MainWidget() { } //----------------------------------------------------------------------------- // Public slots //----------------------------------------------------------------------------- void MainWidget::stateChanged(QAudio::Mode mode, QAudio::State state) { Q_UNUSED(mode); updateButtonStates(); if (QAudio::ActiveState != state && QAudio::SuspendedState != state && QAudio::InterruptedState != state) { m_levelMeter->reset(); m_spectrograph->reset(); } } void MainWidget::formatChanged(const QAudioFormat &format) { infoMessage(formatToString(format), NullMessageTimeout); #ifndef DISABLE_WAVEFORM if (QAudioFormat() != format) { m_waveform->initialize(format, WaveformTileLength, WaveformWindowDuration); } #endif } void MainWidget::spectrumChanged(qint64 position, qint64 length, const FrequencySpectrum &spectrum) { m_progressBar->windowChanged(position, length); m_spectrograph->spectrumChanged(spectrum); } void MainWidget::infoMessage(const QString &message, int timeoutMs) { m_infoMessage->setText(message); if (NullTimerId != m_infoMessageTimerId) { killTimer(m_infoMessageTimerId); m_infoMessageTimerId = NullTimerId; } if (NullMessageTimeout != timeoutMs) m_infoMessageTimerId = startTimer(timeoutMs); } void MainWidget::errorMessage(const QString &heading, const QString &detail) { QMessageBox::warning(this, heading, detail, QMessageBox::Close); } void MainWidget::timerEvent(QTimerEvent *event) { Q_ASSERT(event->timerId() == m_infoMessageTimerId); Q_UNUSED(event) // suppress warnings in release builds killTimer(m_infoMessageTimerId); m_infoMessageTimerId = NullTimerId; m_infoMessage->setText(""); } void MainWidget::audioPositionChanged(qint64 position) { #ifndef DISABLE_WAVEFORM m_waveform->audioPositionChanged(position); #else Q_UNUSED(position) #endif } void MainWidget::bufferLengthChanged(qint64 length) { m_progressBar->bufferLengthChanged(length); } //----------------------------------------------------------------------------- // Private slots //----------------------------------------------------------------------------- void MainWidget::showFileDialog() { const QString dir; const QStringList fileNames = QFileDialog::getOpenFileNames(this, tr("Open WAV file"), dir, "*.wav"); if (fileNames.count()) { reset(); setMode(LoadFileMode); m_engine->loadFile(fileNames.front()); updateButtonStates(); } else { updateModeMenu(); } } void MainWidget::showSettingsDialog() { m_settingsDialog->exec(); if (m_settingsDialog->result() == QDialog::Accepted) { m_engine->setAudioInputDevice(m_settingsDialog->inputDevice()); m_engine->setAudioOutputDevice(m_settingsDialog->outputDevice()); m_engine->setWindowFunction(m_settingsDialog->windowFunction()); } } void MainWidget::showToneGeneratorDialog() { m_toneGeneratorDialog->exec(); if (m_toneGeneratorDialog->result() == QDialog::Accepted) { reset(); setMode(GenerateToneMode); const qreal amplitude = m_toneGeneratorDialog->amplitude(); if (m_toneGeneratorDialog->isFrequencySweepEnabled()) { m_engine->generateSweptTone(amplitude); } else { const qreal frequency = m_toneGeneratorDialog->frequency(); const Tone tone(frequency, amplitude); m_engine->generateTone(tone); updateButtonStates(); } } else { updateModeMenu(); } } void MainWidget::initializeRecord() { reset(); setMode(RecordMode); if (m_engine->initializeRecord()) updateButtonStates(); } //----------------------------------------------------------------------------- // Private functions //----------------------------------------------------------------------------- void MainWidget::createUi() { createMenus(); setWindowTitle(tr("Spectrum Analyser")); QVBoxLayout *windowLayout = new QVBoxLayout(this); m_infoMessage->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed); m_infoMessage->setAlignment(Qt::AlignHCenter); windowLayout->addWidget(m_infoMessage); #ifdef SUPERIMPOSE_PROGRESS_ON_WAVEFORM QScopedPointer<QHBoxLayout> waveformLayout(new QHBoxLayout); waveformLayout->addWidget(m_progressBar); m_progressBar->setMinimumHeight(m_waveform->minimumHeight()); waveformLayout->setMargin(0); m_waveform->setLayout(waveformLayout.data()); waveformLayout.take(); windowLayout->addWidget(m_waveform); #else #ifndef DISABLE_WAVEFORM windowLayout->addWidget(m_waveform); #endif // DISABLE_WAVEFORM windowLayout->addWidget(m_progressBar); #endif // SUPERIMPOSE_PROGRESS_ON_WAVEFORM // Spectrograph and level meter QScopedPointer<QHBoxLayout> analysisLayout(new QHBoxLayout); analysisLayout->addWidget(m_spectrograph); analysisLayout->addWidget(m_levelMeter); windowLayout->addLayout(analysisLayout.data()); analysisLayout.take(); // Button panel const QSize buttonSize(30, 30); m_modeButton->setText(tr("Mode")); m_recordIcon = QIcon(":/images/record.png"); m_recordButton->setIcon(m_recordIcon); m_recordButton->setEnabled(false); m_recordButton->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed); m_recordButton->setMinimumSize(buttonSize); m_pauseIcon = style()->standardIcon(QStyle::SP_MediaPause); m_pauseButton->setIcon(m_pauseIcon); m_pauseButton->setEnabled(false); m_pauseButton->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed); m_pauseButton->setMinimumSize(buttonSize); m_playIcon = style()->standardIcon(QStyle::SP_MediaPlay); m_playButton->setIcon(m_playIcon); m_playButton->setEnabled(false); m_playButton->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed); m_playButton->setMinimumSize(buttonSize); m_settingsIcon = QIcon(":/images/settings.png"); m_settingsButton->setIcon(m_settingsIcon); m_settingsButton->setEnabled(true); m_settingsButton->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed); m_settingsButton->setMinimumSize(buttonSize); QScopedPointer<QHBoxLayout> buttonPanelLayout(new QHBoxLayout); buttonPanelLayout->addStretch(); buttonPanelLayout->addWidget(m_modeButton); buttonPanelLayout->addWidget(m_recordButton); buttonPanelLayout->addWidget(m_pauseButton); buttonPanelLayout->addWidget(m_playButton); buttonPanelLayout->addWidget(m_settingsButton); QWidget *buttonPanel = new QWidget(this); buttonPanel->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed); buttonPanel->setLayout(buttonPanelLayout.data()); buttonPanelLayout.take(); // ownership transferred to buttonPanel QScopedPointer<QHBoxLayout> bottomPaneLayout(new QHBoxLayout); bottomPaneLayout->addWidget(buttonPanel); windowLayout->addLayout(bottomPaneLayout.data()); bottomPaneLayout.take(); // ownership transferred to windowLayout // Apply layout setLayout(windowLayout); } void MainWidget::connectUi() { connect(m_recordButton, &QPushButton::clicked, m_engine, &Engine::startRecording); connect(m_pauseButton, &QPushButton::clicked, m_engine, &Engine::suspend); connect(m_playButton, &QPushButton::clicked, m_engine, &Engine::startPlayback); connect(m_settingsButton, &QPushButton::clicked, this, &MainWidget::showSettingsDialog); connect(m_engine, &Engine::stateChanged, this, &MainWidget::stateChanged); connect(m_engine, &Engine::formatChanged, this, &MainWidget::formatChanged); m_progressBar->bufferLengthChanged(m_engine->bufferLength()); connect(m_engine, &Engine::bufferLengthChanged, this, &MainWidget::bufferLengthChanged); connect(m_engine, &Engine::dataLengthChanged, this, &MainWidget::updateButtonStates); connect(m_engine, &Engine::recordPositionChanged, m_progressBar, &ProgressBar::recordPositionChanged); connect(m_engine, &Engine::playPositionChanged, m_progressBar, &ProgressBar::playPositionChanged); connect(m_engine, &Engine::recordPositionChanged, this, &MainWidget::audioPositionChanged); connect(m_engine, &Engine::playPositionChanged, this, &MainWidget::audioPositionChanged); connect(m_engine, &Engine::levelChanged, m_levelMeter, &LevelMeter::levelChanged); connect(m_engine, QOverload<qint64, qint64, const FrequencySpectrum&>::of(&Engine::spectrumChanged), this, QOverload<qint64, qint64, const FrequencySpectrum&>::of(&MainWidget::spectrumChanged)); connect(m_engine, &Engine::infoMessage, this, &MainWidget::infoMessage); connect(m_engine, &Engine::errorMessage, this, &MainWidget::errorMessage); connect(m_spectrograph, &Spectrograph::infoMessage, this, &MainWidget::infoMessage); #ifndef DISABLE_WAVEFORM connect(m_engine, &Engine::bufferChanged, m_waveform, &Waveform::bufferChanged); #endif } void MainWidget::createMenus() { m_modeButton->setMenu(m_modeMenu); m_generateToneAction = m_modeMenu->addAction(tr("Play generated tone")); m_recordAction = m_modeMenu->addAction(tr("Record and play back")); m_loadFileAction = m_modeMenu->addAction(tr("Play file")); m_loadFileAction->setCheckable(true); m_generateToneAction->setCheckable(true); m_recordAction->setCheckable(true); connect(m_loadFileAction, &QAction::triggered, this, &MainWidget::showFileDialog); connect(m_generateToneAction, &QAction::triggered, this, &MainWidget::showToneGeneratorDialog); connect(m_recordAction, &QAction::triggered, this, &MainWidget::initializeRecord); } void MainWidget::updateButtonStates() { const bool recordEnabled = ((QAudio::AudioOutput == m_engine->mode() || (QAudio::ActiveState != m_engine->state() && QAudio::IdleState != m_engine->state())) && RecordMode == m_mode); m_recordButton->setEnabled(recordEnabled); const bool pauseEnabled = (QAudio::ActiveState == m_engine->state() || QAudio::IdleState == m_engine->state()); m_pauseButton->setEnabled(pauseEnabled); const bool playEnabled = (/*m_engine->dataLength() &&*/ (QAudio::AudioOutput != m_engine->mode() || (QAudio::ActiveState != m_engine->state() && QAudio::IdleState != m_engine->state() && QAudio::InterruptedState != m_engine->state()))); m_playButton->setEnabled(playEnabled); } void MainWidget::reset() { #ifndef DISABLE_WAVEFORM m_waveform->reset(); #endif m_engine->reset(); m_levelMeter->reset(); m_spectrograph->reset(); m_progressBar->reset(); } void MainWidget::setMode(Mode mode) { m_mode = mode; updateModeMenu(); } void MainWidget::updateModeMenu() { m_loadFileAction->setChecked(LoadFileMode == m_mode); m_generateToneAction->setChecked(GenerateToneMode == m_mode); m_recordAction->setChecked(RecordMode == m_mode); }

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