mainwindow.cpp Example File

/****************************************************************************
**
** 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."
**
** $QT_END_LICENSE$
**
****************************************************************************/
#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);
}