musicplayer.h Example File

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 #ifndef MUSICPLAYER_H
 #define MUSICPLAYER_H

 #include <QWidget>
 #include <QMediaPlayer>

 class VolumeButton;

 QT_FORWARD_DECLARE_CLASS(QLabel)
 QT_FORWARD_DECLARE_CLASS(QSlider)
 QT_FORWARD_DECLARE_CLASS(QAbstractButton)
 QT_FORWARD_DECLARE_CLASS(QWinTaskbarButton)
 QT_FORWARD_DECLARE_CLASS(QWinTaskbarProgress)
 QT_FORWARD_DECLARE_CLASS(QWinThumbnailToolBar)
 QT_FORWARD_DECLARE_CLASS(QWinThumbnailToolButton)

 class MusicPlayer : public QWidget
 {
     Q_OBJECT
 public:
     explicit MusicPlayer(QWidget *parent = nullptr);

     static QStringList supportedMimeTypes();
     static QStringList supportedSuffixes();

 public slots:
     void openFile();
     void playUrl(const QUrl& url);
     void togglePlayback();
     void seekForward();
     void seekBackward();

 protected:
     bool event(QEvent *event) override;
     void dragEnterEvent(QDragEnterEvent *event) override;
     void dropEvent(QDropEvent *event) override;
     void mousePressEvent(QMouseEvent *event) override;
     void mouseMoveEvent(QMouseEvent *event) override;
     void mouseReleaseEvent(QMouseEvent *event) override;

 private slots:
     void stylize();
     void updateState(QMediaPlayer::State state);
     void updatePosition(qint64 position);
     void updateDuration(qint64 duration);
     void setPosition(int position);
     void updateInfo();
     void handleError();

     void updateTaskbar();
     void updateThumbnailToolBar();

 private:
     void createWidgets();
     void createShortcuts();
     void createJumpList();
     void createTaskbar();
     void createThumbnailToolBar();

     QWinTaskbarButton *taskbarButton = nullptr;
     QWinTaskbarProgress *taskbarProgress = nullptr;
     QWinThumbnailToolBar *thumbnailToolBar = nullptr;
     QWinThumbnailToolButton *playToolButton = nullptr;
     QWinThumbnailToolButton *forwardToolButton = nullptr;
     QWinThumbnailToolButton *backwardToolButton = nullptr;

     QMediaPlayer mediaPlayer;
     QAbstractButton *playButton = nullptr;
     VolumeButton *volumeButton = nullptr;
     QSlider *positionSlider = nullptr;
     QLabel *positionLabel = nullptr;
     QLabel *infoLabel = nullptr;
     QPoint offset;
     QString fileName;
 };

 #endif // MUSICPLAYER_H