qt6-bb10/qtmultimedia/examples/multimedia/player/playercontrols.cpp

// Copyright (C) 2017 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause

#include "playercontrols.h"

#include <QAudio>
#include <QBoxLayout>
#include <QComboBox>
#include <QSlider>
#include <QStyle>
#include <QToolButton>

PlayerControls::PlayerControls(QWidget *parent) : QWidget(parent)
{
    m_playButton = new QToolButton(this);
    m_playButton->setIcon(style()->standardIcon(QStyle::SP_MediaPlay));

    connect(m_playButton, &QAbstractButton::clicked, this, &PlayerControls::playClicked);

    m_pauseButton = new QToolButton(this);
    m_pauseButton->setIcon(style()->standardIcon(QStyle::SP_MediaPause));
    connect(m_pauseButton, &QAbstractButton::clicked, this, &PlayerControls::pauseClicked);

    m_stopButton = new QToolButton(this);
    m_stopButton->setIcon(style()->standardIcon(QStyle::SP_MediaStop));
    connect(m_stopButton, &QAbstractButton::clicked, this, &PlayerControls::stop);

    m_nextButton = new QToolButton(this);
    m_nextButton->setIcon(style()->standardIcon(QStyle::SP_MediaSkipForward));

    connect(m_nextButton, &QAbstractButton::clicked, this, &PlayerControls::next);

    m_previousButton = new QToolButton(this);
    m_previousButton->setIcon(style()->standardIcon(QStyle::SP_MediaSkipBackward));

    connect(m_previousButton, &QAbstractButton::clicked, this, &PlayerControls::previous);

    m_muteButton = new QToolButton(this);
    m_muteButton->setIcon(style()->standardIcon(QStyle::SP_MediaVolume));

    connect(m_muteButton, &QAbstractButton::clicked, this, &PlayerControls::muteClicked);

    m_volumeSlider = new QSlider(Qt::Horizontal, this);
    m_volumeSlider->setRange(0, 100);
    QSizePolicy sp = m_volumeSlider->sizePolicy();
    sp.setHorizontalPolicy(QSizePolicy::MinimumExpanding);
    m_volumeSlider->setSizePolicy(sp);

    connect(m_volumeSlider, &QSlider::valueChanged, this,
            &PlayerControls::onVolumeSliderValueChanged);

    m_rateBox = new QComboBox(this);
    m_rateBox->addItem("0.5x", QVariant(0.5));
    m_rateBox->addItem("1.0x", QVariant(1.0));
    m_rateBox->addItem("2.0x", QVariant(2.0));
    m_rateBox->setCurrentIndex(1);

    connect(m_rateBox, QOverload<int>::of(&QComboBox::activated), this,
            &PlayerControls::updateRate);

    setState(QMediaPlayer::StoppedState, /*force=*/true);

    QBoxLayout *layout = new QHBoxLayout;
    layout->setContentsMargins(0, 0, 0, 0);
    layout->addWidget(m_stopButton);
    layout->addWidget(m_previousButton);
    layout->addWidget(m_pauseButton);
    layout->addWidget(m_playButton);
    layout->addWidget(m_nextButton);
    layout->addWidget(m_muteButton);
    layout->addWidget(m_volumeSlider);
    layout->addWidget(m_rateBox);
    setLayout(layout);
}

QMediaPlayer::PlaybackState PlayerControls::state() const
{
    return m_playerState;
}

void PlayerControls::setState(QMediaPlayer::PlaybackState state, bool force)
{
    if (state != m_playerState || force) {
        m_playerState = state;

        QColor baseColor = palette().color(QPalette::Base);
        QString inactiveStyleSheet = QStringLiteral("background-color: %1").arg(baseColor.name());
        QString defaultStyleSheet = QStringLiteral("");

        switch (state) {
        case QMediaPlayer::StoppedState:
            m_stopButton->setStyleSheet(inactiveStyleSheet);
            m_playButton->setStyleSheet(defaultStyleSheet);
            m_pauseButton->setStyleSheet(defaultStyleSheet);
            break;
        case QMediaPlayer::PlayingState:
            m_stopButton->setStyleSheet(defaultStyleSheet);
            m_playButton->setStyleSheet(inactiveStyleSheet);
            m_pauseButton->setStyleSheet(defaultStyleSheet);
            break;
        case QMediaPlayer::PausedState:
            m_stopButton->setStyleSheet(defaultStyleSheet);
            m_playButton->setStyleSheet(defaultStyleSheet);
            m_pauseButton->setStyleSheet(inactiveStyleSheet);
            break;
        }
    }
}

float PlayerControls::volume() const
{
    qreal linearVolume =
            QAudio::convertVolume(m_volumeSlider->value() / qreal(100),
                                  QAudio::LogarithmicVolumeScale, QAudio::LinearVolumeScale);

    return linearVolume;
}

void PlayerControls::setVolume(float volume)
{
    qreal logarithmicVolume = QAudio::convertVolume(volume, QAudio::LinearVolumeScale,
                                                    QAudio::LogarithmicVolumeScale);

    m_volumeSlider->setValue(qRound(logarithmicVolume * 100));
}

bool PlayerControls::isMuted() const
{
    return m_playerMuted;
}

void PlayerControls::setMuted(bool muted)
{
    if (muted != m_playerMuted) {
        m_playerMuted = muted;

        m_muteButton->setIcon(style()->standardIcon(muted ? QStyle::SP_MediaVolumeMuted
                                                          : QStyle::SP_MediaVolume));
    }
}

void PlayerControls::playClicked()
{
    emit play();
}

void PlayerControls::pauseClicked()
{
    emit pause();
}

void PlayerControls::muteClicked()
{
    emit changeMuting(!m_playerMuted);
}

qreal PlayerControls::playbackRate() const
{
    return m_rateBox->itemData(m_rateBox->currentIndex()).toDouble();
}

void PlayerControls::setPlaybackRate(float rate)
{
    for (int i = 0; i < m_rateBox->count(); ++i) {
        if (qFuzzyCompare(rate, float(m_rateBox->itemData(i).toDouble()))) {
            m_rateBox->setCurrentIndex(i);
            return;
        }
    }

    m_rateBox->addItem(QStringLiteral("%1x").arg(rate), QVariant(rate));
    m_rateBox->setCurrentIndex(m_rateBox->count() - 1);
}

void PlayerControls::updateRate()
{
    emit changeRate(playbackRate());
}

void PlayerControls::onVolumeSliderValueChanged()
{
    emit changeVolume(volume());
}

#include "moc_playercontrols.cpp"