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_OBJECT

public:
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_OBJECT
public:
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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