xref: /OK3568_Linux_fs/app/forlinx/forlinx_qt/musicplayer/musicplayer.cpp (revision 4882a59341e53eb6f0b4789bf948001014eff981)

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** Copyright (C) 2015 The Qt Company Ltd.
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#include "musicplayer.h"
#include "volumebutton.h"
#include <QDebug>
#include <QtWidgets>
#include <QApplication>
#include <QSlider>
#include <QPainter>



MusicPlayer::MusicPlayer(QWidget *parent) : QWidget(parent)
{
	setWindowState(Qt::WindowMaximized);
    setWindowFlags(Qt::FramelessWindowHint);

    createWidgets();
    createShortcuts();

    connect(&mediaPlayer, &QMediaPlayer::positionChanged, this, &MusicPlayer::updatePosition);
    connect(&mediaPlayer, &QMediaPlayer::durationChanged, this, &MusicPlayer::updateDuration);
    connect(&mediaPlayer, &QMediaObject::metaDataAvailableChanged, this, &MusicPlayer::updateInfo);

    typedef void(QMediaPlayer::*ErrorSignal)(QMediaPlayer::Error);
    connect(&mediaPlayer, static_cast<ErrorSignal>(&QMediaPlayer::error),
            this, &MusicPlayer::handleError);
    connect(&mediaPlayer, &QMediaPlayer::stateChanged,
            this, &MusicPlayer::updateState);

    setAcceptDrops(true);
}

QStringList MusicPlayer::supportedMimeTypes()
{
    QStringList result = QMediaPlayer::supportedMimeTypes();
    if (result.isEmpty())
        result.append(QStringLiteral("audio/mpeg"));
    return result;
}

void MusicPlayer::openFile()
{
    QFileDialog fileDialog(this);
    fileDialog.setAcceptMode(QFileDialog::AcceptOpen);
    fileDialog.setWindowTitle(tr("Open File"));
    fileDialog.setMimeTypeFilters(MusicPlayer::supportedMimeTypes());
    fileDialog.setDirectory(QStandardPaths::standardLocations(QStandardPaths::MusicLocation).value(0, QDir::homePath()));
    if (fileDialog.exec() == QDialog::Accepted)
    {
         playUrl(fileDialog.selectedUrls().constFirst());
    }

}

void MusicPlayer::playUrl(const QUrl &url)
{
    playButton->setEnabled(true);
    if (url.isLocalFile()) {
        const QString filePath = url.toLocalFile();
        setWindowFilePath(filePath);
        infoLabel->setText(QDir::toNativeSeparators(filePath));
        fileName = QFileInfo(filePath).fileName();
    } else {
        setWindowFilePath(QString());
        infoLabel->setText(url.toString());
        fileName.clear();
    }
    mediaPlayer.setMedia(url);
    mediaPlayer.play();
}

void MusicPlayer::togglePlayback()
{
    if (mediaPlayer.mediaStatus() == QMediaPlayer::NoMedia)
        openFile();
    else if (mediaPlayer.state() == QMediaPlayer::PlayingState)
        mediaPlayer.pause();
    else
        mediaPlayer.play();
}

void MusicPlayer::seekForward()
{
    positionSlider->triggerAction(QSlider::SliderPageStepAdd);
}

void MusicPlayer::seekBackward()
{
    positionSlider->triggerAction(QSlider::SliderPageStepSub);
}

//! [0]
bool MusicPlayer::event(QEvent *event)
{
    return QWidget::event(event);
}
//! [0]

static bool canHandleDrop(const QDropEvent *event)
{
    const QList<QUrl> urls = event->mimeData()->urls();
    if (urls.size() != 1)
        return false;
    QMimeDatabase mimeDatabase;
    return MusicPlayer::supportedMimeTypes().
        contains(mimeDatabase.mimeTypeForUrl(urls.constFirst()).name());
}

void MusicPlayer::dragEnterEvent(QDragEnterEvent *event)
{
    event->setAccepted(canHandleDrop(event));
}

void MusicPlayer::dropEvent(QDropEvent *event)
{
    event->accept();
   // playUrl(event->mimeData()->urls().constFirst());
}

void MusicPlayer::mousePressEvent(QMouseEvent *event)
{
    offset = event->globalPos() - pos();
    event->accept();
}

void MusicPlayer::mouseMoveEvent(QMouseEvent *event)
{
    //move(event->globalPos() - offset);
    event->accept();
}

void MusicPlayer::mouseReleaseEvent(QMouseEvent *event)
{
    offset = QPoint();
    event->accept();
}

void MusicPlayer::updateState(QMediaPlayer::State state)
{
    if (state == QMediaPlayer::PlayingState) {
        playButton->setToolTip(tr("Pause"));
        playButton->setIcon(style()->standardIcon(QStyle::SP_MediaPause));
    } else {
        playButton->setToolTip(tr("Play"));
        playButton->setIcon(style()->standardIcon(QStyle::SP_MediaPlay));
    }
}

static QString formatTime(qint64 timeMilliSeconds)
{
    qint64 seconds = timeMilliSeconds / 1000;
    const qint64 minutes = seconds / 60;
    seconds -= minutes * 60;
    return QStringLiteral("%1:%2")
        .arg(minutes, 2, 10, QLatin1Char('0'))
        .arg(seconds, 2, 10, QLatin1Char('0'));
}

void MusicPlayer::updatePosition(qint64 position)

{
    positionSlider->setValue(position);
    positionLabel->setText(formatTime(position));
}

void MusicPlayer::updateDuration(qint64 duration)
{
    positionSlider->setRange(0, duration);
    positionSlider->setEnabled(duration > 0);
    positionSlider->setPageStep(duration / 10);
    updateInfo();
}


void MusicPlayer::setPosition(int position)
{
    // avoid seeking when the slider value change is triggered from updatePosition()
    if (qAbs(mediaPlayer.position() - position) > 99)
    {
        mediaPlayer.setPosition(position);
    }
}

void MusicPlayer::updateInfo()
{
    QStringList info;
    if (!fileName.isEmpty())
        info.append(fileName);
    if (mediaPlayer.isMetaDataAvailable()) {
        QString author = mediaPlayer.metaData(QStringLiteral("Author")).toString();
        if (!author.isEmpty())
            info.append(author);
        QString title = mediaPlayer.metaData(QStringLiteral("Title")).toString();
        if (!title.isEmpty())
            info.append(title);
    }
    info.append(formatTime(mediaPlayer.duration()));
    infoLabel->setText(info.join(tr(" - ")));
}

void MusicPlayer::handleError()
{
    playButton->setEnabled(false);
    const QString errorString = mediaPlayer.errorString();
    infoLabel->setText(errorString.isEmpty()
                       ? tr("Unknown error #%1").arg(int(mediaPlayer.error()))
                       : tr("Error: %1").arg(errorString));
}

void MusicPlayer::createWidgets()
{
    playButton = new QToolButton(this);
    playButton->setEnabled(false);
    playButton->setToolTip(tr("Play"));
    playButton->setIcon(style()->standardIcon(QStyle::SP_MediaPlay));
    playButton->setFixedSize(55,35);
    connect(playButton, &QAbstractButton::clicked, this, &MusicPlayer::togglePlayback);

    QAbstractButton *openButton = new QToolButton(this);
    openButton->setText(tr("..."));
    openButton->setToolTip(tr("Open a file..."));
    openButton->setFixedSize(55,35);
    connect(openButton, &QAbstractButton::clicked, this, &MusicPlayer::openFile);

	QPushButton *exitBtn = new QPushButton(this);
	exitBtn->setText(tr("Exit"));
	exitBtn->setFixedSize(55,35);
	connect(exitBtn, &QPushButton::clicked, this, [=](){
    close();
    });


    volumeButton = new VolumeButton(this);
    volumeButton->setToolTip(tr("Adjust volume"));
    volumeButton->setVolume(mediaPlayer.volume());
    volumeButton->setFixedSize(55,35);
    connect(volumeButton, &VolumeButton::volumeChanged, &mediaPlayer, &QMediaPlayer::setVolume);

    positionSlider = new QSlider(Qt::Horizontal, this);
    positionSlider->setEnabled(false);
    positionSlider->setToolTip(tr("Seek"));
    positionSlider->setMaximum(1000000);
    positionSlider->setMinimum(0);
    positionSlider->setValue(0);
    positionSlider->setMinimumWidth(120);
    connect(positionSlider, &QSlider::valueChanged, this, &MusicPlayer::setPosition);

    infoLabel = new QLabel(this);
    QFont font;
    font.setPointSize(14);
    infoLabel->setFont(font);

    positionLabel = new QLabel(tr("00:00"), this);
    positionLabel->setMinimumWidth(positionLabel->sizeHint().width());

    QGridLayout *controlLayout = new QGridLayout(this);
    controlLayout->addWidget(openButton,1,0);
    controlLayout->addWidget(playButton,1,1);
    controlLayout->addWidget(positionSlider,1,2);
    controlLayout->addWidget(positionLabel,1,3);
    controlLayout->addWidget(volumeButton,1,4);
	controlLayout->addWidget(exitBtn, 1, 5);
    controlLayout->addWidget(infoLabel,0,2);
    controlLayout->setSpacing(25);

}

void MusicPlayer::createShortcuts()
{
    QShortcut *quitShortcut = new QShortcut(QKeySequence::Quit, this);
    connect(quitShortcut, &QShortcut::activated, QCoreApplication::quit);

    QShortcut *openShortcut = new QShortcut(QKeySequence::Open, this);
    connect(openShortcut, &QShortcut::activated, this, &MusicPlayer::openFile);

    QShortcut *toggleShortcut = new QShortcut(Qt::Key_Space, this);
    connect(toggleShortcut, &QShortcut::activated, this, &MusicPlayer::togglePlayback);

    QShortcut *forwardShortcut = new QShortcut(Qt::Key_Right, this);
    connect(forwardShortcut, &QShortcut::activated, this, &MusicPlayer::seekForward);

    QShortcut *backwardShortcut = new QShortcut(Qt::Key_Left, this);
    connect(backwardShortcut, &QShortcut::activated, this, &MusicPlayer::seekBackward);

    QShortcut *increaseShortcut = new QShortcut(Qt::Key_Up, this);
    connect(increaseShortcut, &QShortcut::activated, volumeButton, &VolumeButton::increaseVolume);

    QShortcut *decreaseShortcut = new QShortcut(Qt::Key_Down, this);
    connect(decreaseShortcut, &QShortcut::activated, volumeButton, &VolumeButton::descreaseVolume);
}