mainwindow.cpp Example File

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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);
  }