自学QT之简易音乐播放器基于QT5.5

自己写的音乐播放器，还存在很多bug，只是作为一种尝试而已。交流学习群：271251545

播放器实现的功能：添加歌曲、上一首、暂停、下一首、切换歌曲、托盘、任务栏对歌曲进行操作

界面偷懒，直接使用的设计师界面，歌曲列表使用的是qtablewidget做的

player头文件代码：

#ifndef PLAYER_H#define PLAYER_H#include <QWidget>#include <QMouseEvent>#include <QPoint>#include <QMediaPlayer>#include <QFileDialog>#include <QSystemTrayIcon>#include <QEvent>#include <QMenu>#include <QAction>#include "about.h"#include <QWinThumbnailToolButton>#include <QWinThumbnailToolBar>#include <QStandardItemModel>#include <QTableView>#include <QDirModel>#include <QDir>#include <QStringListIterator>#include <QMediaPlaylist>#include <QTimer>namespace Ui {class player;}class player : public QWidget{    Q_OBJECTpublic:    explicit player(QWidget *parent = 0);    ~player();    QPoint drag;//定义一个释放点    void mousePressEvent(QMouseEvent *);//窗口移动事件    void mouseMoveEvent(QMouseEvent *);//窗口移动事件    QMediaPlayer *myPlayer;    QSystemTrayIcon *trayIcon;protected:    QAction *quitAction;    QAction *aboutAction;    QAction *nextAction;    QAction *pauseAction;    QAction *backAction;    QWinThumbnailToolButton *backToolBtn;    QWinThumbnailToolButton *pauseToolBtn;    QWinThumbnailToolButton *nextToolBtn;    QWinThumbnailToolBar *taskBar;    QStandardItemModel *songListModel;    QStringList path;    QMediaPlaylist *playList;    QTimer *timer;    qint64 pausePosition;    int currentIndex;private slots:    void on_closeBtn_clicked();    void on_miniBtn_clicked();    void on_pushButton_2_clicked();    void on_pauseBtn_clicked();    void on_volum_valueChanged(int value);    void tuopan(QSystemTrayIcon::ActivationReason reason);    void showAbout();    void myPlayerSlot(QModelIndex index);    void on_importBtn_clicked();    void setPosition();    void on_horizontalSlider_valueChanged(int value);    void on_nextBtn_clicked();    void on_backBtn_clicked();    void mediaChange(int);private:    Ui::player *ui;};#endif // PLAYER_H

player.cpp文件代码：

#include "player.h"#include "ui_player.h"#include <QDebug>#include <QtWinExtras>#include <QList>player::player(QWidget *parent) :    QWidget(parent),    ui(new Ui::player){    ui->setupUi(this);    this->setWindowFlags(Qt::FramelessWindowHint | Qt::WindowSystemMenuHint | Qt::WindowMinimizeButtonHint);//隐藏标题栏    setWindowIcon(QIcon(":/new/prefix1/image/tray.jpg"));    myPlayer=new QMediaPlayer();    ui->volum->setValue(50);    myPlayer->setVolume(ui->volum->value());    playList=new QMediaPlaylist;    trayIcon=new QSystemTrayIcon;    connect(trayIcon,SIGNAL(activated(QSystemTrayIcon::ActivationReason)),this,            SLOT(tuopan(QSystemTrayIcon::ActivationReason)));//将托盘图标和双击事件关联    QPixmap pixmap(":/new/prefix1/image/background.jpg");//当前文件夹下面的图片    QPalette palette = this->palette();    palette.setBrush(backgroundRole(), QBrush(pixmap));    connect(playList,SIGNAL(currentIndexChanged(int)),this,SLOT(mediaChange(int)));    setPalette(palette);    //任务栏按钮    QMenu * menu=new QMenu(this);    if (QtWin::isCompositionEnabled()) {        QtWin::enableBlurBehindWindow(menu);    } else{        QtWin::disableBlurBehindWindow(menu);        menu->hide();    }    taskBar=new QWinThumbnailToolBar();    taskBar->setWindow(windowHandle());    backToolBtn=new QWinThumbnailToolButton(taskBar);    backToolBtn->setToolTip("上一首");    backToolBtn->setIcon(QIcon(":/new/prefix1/image/back.png"));    connect(backToolBtn,SIGNAL(clicked()),this,SLOT(on_backBtn_clicked()));    pauseToolBtn=new QWinThumbnailToolButton(taskBar);    connect(pauseToolBtn,SIGNAL(clicked()),this,SLOT(on_pauseBtn_clicked()));    pauseToolBtn->setToolTip("暂停");    pauseToolBtn->setIcon(QIcon(":/new/prefix1/image/pause.png"));    nextToolBtn=new QWinThumbnailToolButton(taskBar);    nextToolBtn->setToolTip("下一首");    nextToolBtn->setIcon(QIcon(":/new/prefix1/image/next.png"));    connect(nextToolBtn,SIGNAL(clicked()),this,SLOT(on_nextBtn_clicked()));    taskBar->addButton(backToolBtn);    taskBar->addButton(pauseToolBtn);    taskBar->addButton(nextToolBtn);    //歌曲列表    songListModel=new QStandardItemModel;    songListModel->setHorizontalHeaderItem(0,new QStandardItem(QObject::tr("歌曲列表")));       ui->songList->setModel(songListModel);    ui->songList->setColumnWidth(0,390);        ui->songList->verticalHeader()->hide();    ui->songList->setEditTriggers(QAbstractItemView::NoEditTriggers);    ui->songList->setSelectionBehavior(QAbstractItemView::SelectRows);    connect(ui->songList,SIGNAL(doubleClicked(QModelIndex)),this,SLOT(myPlayerSlot(QModelIndex)));    //定时器    timer=new QTimer;    connect(timer,SIGNAL(timeout()),this,SLOT(setPosition()));}player::~player(){    delete ui;}void player::on_closeBtn_clicked()//单击关闭按钮，产生托盘和托盘菜单{    this->hide();    ui->nameLabel->styleSheet();    trayIcon->setIcon(QIcon(":/new/prefix1/image/tray.jpg"));    QMenu *trayMenu=new QMenu();    aboutAction=new QAction(tr("关于"),this);    quitAction=new QAction(tr("退出"),this);    trayMenu->addAction(aboutAction);    connect(aboutAction,SIGNAL(triggered(bool)),this,SLOT(showAbout()));    trayMenu->addAction(quitAction);    connect(quitAction,SIGNAL(triggered(bool)),this,SLOT(close()));    trayIcon->setContextMenu(trayMenu);    trayIcon->setToolTip("托盘图标");    trayIcon->show();    trayIcon->showMessage("主人","我在这里哦",QSystemTrayIcon::Information,5000);//一定要放在这里，否则提示信息会不显示}void player::on_miniBtn_clicked(){    this->showMinimized();}void player::mousePressEvent(QMouseEvent *e){    if(e->button()==Qt::LeftButton)//button()是按钮    {        drag=e->globalPos()-this->geometry().topLeft();//鼠标位置减去左上角的左边        e->accept();    }}void player::mouseMoveEvent(QMouseEvent *e){    if(e->buttons()&Qt::LeftButton)//buttons()返回的是按钮状态    {        move(e->globalPos()-drag);        e->accept();    }}//选择歌曲void player::on_pushButton_2_clicked(){    QString path=QFileDialog::getOpenFileName(this,tr("选择一首歌曲"),"/","*.mp3");    QFileInfo fileInfo;    fileInfo=QFileInfo(path);    QString fileName=fileInfo.baseName();    ui->nameLabel->setText(fileName);    myPlayer->setMedia(QUrl::fromLocalFile(path));    myPlayer->play();}//暂停按钮void player::on_pauseBtn_clicked(){    switch (myPlayer->state()) {    case QMediaPlayer::PlayingState:        timer->stop();        currentIndex=playList->currentIndex();        pausePosition=myPlayer->position();        myPlayer->pause();        break;    case QMediaPlayer::PausedState:        myPlayer->setMedia(playList->media(currentIndex));        myPlayer->setPosition(pausePosition);        timer->start(1000);        myPlayer->play();        break;    default:        break;    }}//音量调节void player::on_volum_valueChanged(int value){    myPlayer->setVolume(value);}void player::tuopan(QSystemTrayIcon::ActivationReason reason)//双击托盘图标，恢复程序正常界面{    switch (reason)    {    case QSystemTrayIcon::DoubleClick:        this->showNormal();        break;    default:        break;    }}//显示关于本程序对话框void player::showAbout(){    about showabout;    showabout.setModal(false);    showabout.setWindowTitle("关于本程序");    showabout.exec();}//导入多首歌曲void player::on_importBtn_clicked(){    path=QFileDialog::getOpenFileNames(this,"选择歌曲","/","(*.mp3)");    int i=0;    QString addSongs;    QListIterator<QString> mylist(path);    while(mylist.hasNext())    {        addSongs=mylist.next();        QFileInfo fileInfo;        fileInfo=QFileInfo(addSongs);        QString fileName=fileInfo.fileName();        songListModel->setItem(i,0,new QStandardItem(fileName));        playList->addMedia(QUrl::fromLocalFile(addSongs));        i++;    }    playList->setPlaybackMode(QMediaPlaylist::Loop);    myPlayer->setPlaylist(playList);}//双击播放void player::myPlayerSlot(QModelIndex index){    timer->start(1000);    int n=index.row();    playList->setCurrentIndex(n);//    myPlayer->setMedia(playList->currentMedia());这句话不能加，加了反而错误    myPlayer->play();}//设置播放进度条void player::setPosition(){    qint64 position=myPlayer->position();    ui->horizontalSlider->setMaximum(myPlayer->duration());    ui->horizontalSlider->setSliderPosition(position);}void player::on_horizontalSlider_valueChanged(int value)//快进和快退功能{    qint64 currentPosition=myPlayer->position();    if(qAbs(value-currentPosition)>2000&&(ui->horizontalSlider->value()!=0))    {        myPlayer->stop();        timer->stop();        myPlayer->setPosition(value);        timer->start();        myPlayer->play();    }}void player::on_nextBtn_clicked()//播放下一首{    if(playList->mediaCount()-playList->currentIndex()!=1)//这里注意的是，和我们正常数数一样，mediaCount是从1开始计数的    {        //myPlayer->setMedia(playList->media(playList->nextIndex()));        playList->setCurrentIndex(playList->nextIndex());        myPlayer->play();    }    else    {        playList->setCurrentIndex(0);       // myPlayer->setMedia(playList->media(0));        myPlayer->play();    }}void player::on_backBtn_clicked()//播放上一首{    if(playList->currentIndex()!=0)//这里注意的是，和我们正常数数一样，mediaCount是从1开始计数的    {        //myPlayer->setMedia(playList->media(playList->previousIndex()));        playList->setCurrentIndex(playList->previousIndex());        myPlayer->play();    }    else    {        playList->setCurrentIndex(playList->mediaCount()-1);        //myPlayer->setMedia(playList->media(playList->mediaCount()-1));        myPlayer->play();    }}void player::mediaChange(int i){    ui->nameLabel->setText(path.at(i));}

关于对话框头文件：

#ifndef ABOUT_H#define ABOUT_H#include <QWidget>#include <QDialog>class about : public QDialog{    Q_OBJECTpublic:    explicit about(QWidget *parent = 0);signals:public slots:};#endif // ABOUT_H

关于对话框源码：

#include "about.h"#include <QLabel>#include <QGridLayout>about::about(QWidget *parent) : QDialog(parent){    QLabel *aboutLabel=new QLabel;    aboutLabel->setText("小黑版本QT音乐播放器");    QHBoxLayout *mainLayout=new QHBoxLayout(this);    mainLayout->addWidget(aboutLabel,Qt::AlignCenter);}

主函数：

#include "player.h"#include <QApplication>int main(int argc, char *argv[]){    QApplication a(argc, argv);    player w;    w.show();    return a.exec();}

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