Qt/QT_Assistant/Assistant/music/music.cpp

#include "music.h"
#include "ui_music.h"
#include <QCoreApplication>
#include <QFileInfoList>
#include <QDir>
#include <QMatrix>
#include <QPixmap>
#include <QTimer>

music::music(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::music)
{
    /* 布局初始化 */
    musicLayout();

    /* 媒体播放器初始化 */
    mediaPlayerInit();

    /* 扫描歌曲 */
    scanSongs();

    /* 按钮信号槽连接 */
       connect(ui->btn_previous, SIGNAL(clicked()),this, SLOT(btn_previous_clicked()));
       connect(ui->btn_play, SIGNAL(clicked()),this, SLOT(btn_play_clicked()));
       connect(ui->btn_next, SIGNAL(clicked()),this, SLOT(btn_next_clicked()));

    /* 列表信号槽连接 */
       connect(ui->listWidget, SIGNAL(itemClicked(QListWidgetItem*)),
               this, SLOT(listWidgetCliked(QListWidgetItem*)));//item 参数指的就是被用户点击的列表项
       /* 媒体信号槽连接 */
       connect(musicPlayer,
               SIGNAL(stateChanged(QMediaPlayer::State)),
               this,
               SLOT(mediaPlayerStateChanged(QMediaPlayer::State)));//播放的状态一旦改变
       connect(mediaPlaylist,
               SIGNAL(currentIndexChanged(int)),
               this,
               SLOT(mediaPlaylistCurrentIndexChanged(int)));//播放列表改变
       connect(musicPlayer, SIGNAL(durationChanged(qint64)),
               this,
               SLOT(musicPlayerDurationChanged(qint64)));//获取音乐的信息
       connect(musicPlayer,
               SIGNAL(positionChanged(qint64)),
               this,
               SLOT(mediaPlayerPositionChanged(qint64)));//获取音乐播放的进度
       /* slider信号槽连接 */
       connect(ui->durationSlider, SIGNAL(sliderReleased()),
               this, SLOT(durationSliderReleased()));//播放进度条滑动，修改音乐的进度

       connect(ui->Slider_volume, SIGNAL(sliderReleased()),
               this,
               SLOT(volume_change()));//调接音量
       ui->Slider_volume->hide();//初始化音量
       floatingbutton= new FloatingButton (this);
       // 将悬浮球的pressed()信号连接到槽函数onButtonPressed()上
      connect(floatingbutton, &FloatingButton::pressed, this, &music::onButtonPressed);

}

music::~music()
{
    delete ui;
    delete musicPlayer;
    delete mediaPlaylist;
    delete listWidget;
    delete listMask;
    delete floatingbutton;
}
void music::onButtonPressed()
{
    emit music_close(false);
    qDebug() << "悬浮球被按下了！";
}
void music::musicLayout()
{
      ui->setupUi(this);
}
void music::scanSongs()
{   
    QDir dir(QCoreApplication::applicationDirPath()
             + "/myMusic");
    QDir dirbsolutePath(dir.absolutePath());
    /* 如果目录存在 */
    if (dirbsolutePath.exists()) {
        /* 定义过滤器 */
        QStringList filter;
        /* 包含所有.mp3后缀的文件 */
        filter << "*.mp3";
        /* 获取该目录下的所有文件 */
        QFileInfoList files =
                dirbsolutePath.entryInfoList(filter, QDir::Files);
        /* 遍历 */
        for (int i = 0; i < files.count(); i++) {
            MediaObjectInfo info;
            /* 使用utf-8编码 */
            QString fileName = QString::fromUtf8(files.at(i)
                                                 .fileName()
                                                 .replace(".mp3", "")
                                                 .toUtf8()
                                                 .data());
            info.fileName = fileName + "\n"
                    + fileName.split("-").at(1);
            info.filePath = QString::fromUtf8(files.at(i)
                                              .filePath()
                                              .toUtf8()
                                              .data());
            /* 媒体列表添加歌曲 */
            if (mediaPlaylist->addMedia(QUrl::fromLocalFile(info.filePath)))
            {
                /* 添加到容器数组里储存 */
                mediaObjectInfo.append(info);
                /* 添加歌曲名字至列表 */
                ui->listWidget->addItem(info.fileName);
                  qDebug()<<info.fileName;
            }
            else {
                qDebug()<<
                           mediaPlaylist->errorString()
                           .toUtf8().data()
                        << endl;
                qDebug()<< "  Error number:"
                         << mediaPlaylist->error()
                         << endl;
            }
        }
    }
}

void music::btn_play_clicked()
{
    int state = musicPlayer->state();//获取播放器的状态

    switch (state) {
    case QMediaPlayer::StoppedState:
        /* 媒体播放 */
        musicPlayer->play();
        break;

    case QMediaPlayer::PlayingState:
        /* 媒体暂停 */
        musicPlayer->pause();
        break;

    case QMediaPlayer::PausedState:
        musicPlayer->play();
        break;
    }
}

void music::btn_next_clicked()
{
    musicPlayer->stop();
    int count = mediaPlaylist->mediaCount();
    if (0 == count)
        return;

    /* 列表下一个 */
    mediaPlaylist->next();
    musicPlayer->play();
}

void music::btn_previous_clicked()
{
    musicPlayer->stop();
    int count = mediaPlaylist->mediaCount();
    if (0 == count)
        return;

    /* 列表上一个 */
    mediaPlaylist->previous();
    musicPlayer->play();
}
void music::listWidgetCliked(QListWidgetItem *item)
{
    musicPlayer->stop();
    mediaPlaylist->setCurrentIndex(ui->listWidget->row(item));//获取行号
    musicPlayer->play();
}
void music::mediaPlayerStateChanged(QMediaPlayer::State state)
{
    switch (state) {
    case QMediaPlayer::StoppedState:
        ui->btn_play->setChecked(false);
        break;

    case QMediaPlayer::PlayingState:
       ui->btn_play->setChecked(true);
        break;

    case QMediaPlayer::PausedState:
       ui->btn_play->setChecked(false);
        break;
    }
}
void music::mediaPlaylistCurrentIndexChanged(int index)
{
    if (-1 == index)
        return;

    /* 设置列表正在播放的项 */
    ui->listWidget->setCurrentRow(index);//设置显示列表指向相应的行
}

void music::musicPlayerDurationChanged(qint64 duration)//duration 音乐的时间（wei秒为单位）
{
    ui->durationSlider->setRange(0, duration / 1000);//设置范围
    int second  = duration / 1000;
    int minute = second / 60;//分钟
    second %= 60;//秒

    QString mediaDuration;
    mediaDuration.clear();

    if (minute >= 10)
        mediaDuration = QString::number(minute, 10);//
    else
        mediaDuration = "0" + QString::number(minute, 10);

    if (second >= 10)
        mediaDuration = mediaDuration
                + ":" + QString::number(second, 10);
    else
        mediaDuration = mediaDuration
                + ":0" + QString::number(second, 10);

    /* 显示媒体总长度时间 */
    ui->label_time_out->setText(mediaDuration);
}
void music::mediaPlayerPositionChanged(qint64 position)//position音乐现在播放的时间
{
    if (!ui->durationSlider->isSliderDown())//没桦到最后
    {
         ui->durationSlider->setValue(position/1000);
    }


    int second  = position / 1000;
    int minute = second / 60;
    second %= 60;

    QString mediaPosition;
    mediaPosition.clear();

    if (minute >= 10)
        mediaPosition = QString::number(minute, 10);
    else
        mediaPosition = "0" + QString::number(minute, 10);

    if (second >= 10)
        mediaPosition = mediaPosition
                + ":" + QString::number(second, 10);
    else
        mediaPosition = mediaPosition
                + ":0" + QString::number(second, 10);

    /* 显示现在播放的时间 */
     ui->label_time_start->setText(mediaPosition);

}

void music::durationSliderReleased()
{
    /* 设置媒体播放的位置 */
   musicPlayer->setPosition(ui->durationSlider->value() * 1000);
   qDebug()<<ui->durationSlider->value();

}

void music::mediaPlayerInit()
{
    musicPlayer = new QMediaPlayer(this);
    mediaPlaylist = new QMediaPlaylist(this);
    /* 确保列表是空的 */
    mediaPlaylist->clear();
    /* 设置音乐播放器的列表为mediaPlaylist */
    musicPlayer->setPlaylist(mediaPlaylist);
    /* 设置播放模式，Loop是列循环 */
    mediaPlaylist->setPlaybackMode(QMediaPlaylist::Loop);
    musicPlayer->setVolume(20);
}

void music::on_btn_volume_toggled(bool checked)
{

    if(checked==true)//按第二遍
    {
        qDebug()<<"released";
        ui->Slider_volume->hide();
    }
    else
    {
        qDebug()<<"released";
        ui->Slider_volume->show();
    }
}

void music::volume_change()
{
    ui->Slider_volume->setRange(0, 150);//设置范围
    musicPlayer->setVolume(ui->Slider_volume->value());
    qDebug()<<"volume="<<ui->Slider_volume->value();
}
void music::image_rotate()
{
    QMatrix matrix;
    matrix.rotate(music::angle);
    if( music::angle ==360)
    {
         music::angle = 0;
    }
    qDebug()<<"angle"<<music::angle;
    //设定图片的大小；
    QImage Image = QImage(":image/images/cd.png");
    QPixmap pixmap = QPixmap::fromImage(Image);
    QPixmap fixpixmap = pixmap.scaled(300,300,Qt::IgnoreAspectRatio
                            ,Qt::SmoothTransformation);
    ui->label->setPixmap((fixpixmap)
                .transformed(matrix,Qt::SmoothTransformation));
   ui->label->setAlignment(Qt::AlignCenter);

}