source: trunk/demos/spectrum/app/mainwidget.cpp@ 1168

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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) {
        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)
{
#ifdef Q_OS_SYMBIAN
    const QString message = heading + "\n" + detail;
    QMessageBox::warning(this, "", message, QMessageBox::Close);
#else
    QMessageBox::warning(this, heading, detail, QMessageBox::Close);
#endif
}

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);