mainwindow.cpp Example File

hello_speak/mainwindow.cpp
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 #include "mainwindow.h"
 #include <QLoggingCategory>

 MainWindow::MainWindow(QWidget *parent)
     : QMainWindow(parent),
     m_speech(0)
 {
     ui.setupUi(this);
     QLoggingCategory::setFilterRules(QStringLiteral("qt.speech.tts=true \n qt.speech.tts.*=true"));

     // Populate engine selection list
     ui.engine->addItem("Default", QString("default"));
     foreach (QString engine, QTextToSpeech::availableEngines())
         ui.engine->addItem(engine, engine);
     ui.engine->setCurrentIndex(0);
     engineSelected(0);

     connect(ui.speakButton, &QPushButton::clicked, this, &MainWindow::speak);
     connect(ui.pitch, &QSlider::valueChanged, this, &MainWindow::setPitch);
     connect(ui.rate, &QSlider::valueChanged, this, &MainWindow::setRate);
     connect(ui.volume, &QSlider::valueChanged, this, &MainWindow::setVolume);
     connect(ui.engine, static_cast<void (QComboBox::*)(int)>(&QComboBox::currentIndexChanged), this, &MainWindow::engineSelected);
 }

 void MainWindow::speak()
 {
     m_speech->say(ui.plainTextEdit->toPlainText());
 }
 void MainWindow::stop()
 {
     m_speech->stop();
 }

 void MainWindow::setRate(int rate)
 {
     m_speech->setRate(rate / 10.0);
 }

 void MainWindow::setPitch(int pitch)
 {
     m_speech->setPitch(pitch / 10.0);
 }

 void MainWindow::setVolume(int volume)
 {
     m_speech->setVolume(volume / 100.0);
 }

 void MainWindow::stateChanged(QTextToSpeech::State state)
 {
     if (state == QTextToSpeech::Speaking) {
         ui.statusbar->showMessage("Speech started...");
     } else if (state == QTextToSpeech::Ready)
         ui.statusbar->showMessage("Speech stopped...", 2000);
     else if (state == QTextToSpeech::Paused)
         ui.statusbar->showMessage("Speech paused...");
     else
         ui.statusbar->showMessage("Speech error!");

     ui.pauseButton->setEnabled(state == QTextToSpeech::Speaking);
     ui.resumeButton->setEnabled(state == QTextToSpeech::Paused);
     ui.stopButton->setEnabled(state == QTextToSpeech::Speaking || state == QTextToSpeech::Paused);
 }

 void MainWindow::engineSelected(int index)
 {
     QString engineName = ui.engine->itemData(index).toString();
     delete m_speech;
     if (engineName == "default")
         m_speech = new QTextToSpeech(this);
     else
         m_speech = new QTextToSpeech(engineName, this);
     disconnect(ui.language, static_cast<void (QComboBox::*)(int)>(&QComboBox::currentIndexChanged), this, &MainWindow::languageSelected);
     ui.language->clear();
     // Populate the languages combobox before connecting its signal.
     QVector<QLocale> locales = m_speech->availableLocales();
     QLocale current = m_speech->locale();
     foreach (const QLocale &locale, locales) {
         QString name(QString("%1 (%2)")
                      .arg(QLocale::languageToString(locale.language()))
                      .arg(QLocale::countryToString(locale.country())));
         QVariant localeVariant(locale);
         ui.language->addItem(name, localeVariant);
         if (locale.name() == current.name())
             current = locale;
     }
     setRate(ui.rate->value());
     setPitch(ui.pitch->value());
     setVolume(ui.volume->value());
     connect(ui.stopButton, &QPushButton::clicked, m_speech, &QTextToSpeech::stop);
     connect(ui.pauseButton, &QPushButton::clicked, m_speech, &QTextToSpeech::pause);
     connect(ui.resumeButton, &QPushButton::clicked, m_speech, &QTextToSpeech::resume);

     connect(m_speech, &QTextToSpeech::stateChanged, this, &MainWindow::stateChanged);
     connect(m_speech, &QTextToSpeech::localeChanged, this, &MainWindow::localeChanged);

     connect(ui.language, static_cast<void (QComboBox::*)(int)>(&QComboBox::currentIndexChanged), this, &MainWindow::languageSelected);
     localeChanged(current);
 }

 void MainWindow::languageSelected(int language)
 {
     QLocale locale = ui.language->itemData(language).toLocale();
     m_speech->setLocale(locale);
 }

 void MainWindow::voiceSelected(int index)
 {
     m_speech->setVoice(m_voices.at(index));
 }

 void MainWindow::localeChanged(const QLocale &locale)
 {
     QVariant localeVariant(locale);
     ui.language->setCurrentIndex(ui.language->findData(localeVariant));

     disconnect(ui.voice, static_cast<void (QComboBox::*)(int)>(&QComboBox::currentIndexChanged), this, &MainWindow::voiceSelected);
     ui.voice->clear();

     m_voices = m_speech->availableVoices();
     QVoice currentVoice = m_speech->voice();
     foreach (const QVoice &voice, m_voices) {
         ui.voice->addItem(QString("%1 - %2 - %3").arg(voice.name())
                           .arg(QVoice::genderName(voice.gender()))
                           .arg(QVoice::ageName(voice.age())));
         if (voice.name() == currentVoice.name())
             ui.voice->setCurrentIndex(ui.voice->count() - 1);
     }
     connect(ui.voice, static_cast<void (QComboBox::*)(int)>(&QComboBox::currentIndexChanged), this, &MainWindow::voiceSelected);
 }