基于QMediaplayer的播放器

#include "mainwindow.h" #include "ui_mainwindow.h" #include <QtWidgets> #include <QMediaPlayer> #include <QMediaPlaylist> MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow) { ui->setupUi(this); createContextMenu(); playList=new QMediaPlaylist; playList->setPlaybackMode(QMediaPlaylist::Loop); player=new QMediaPlayer; player->setPlaylist(playList); player->setVolume(volume); connect(ui->horizontalSlider, SIGNAL(sliderMoved(int)), this, SLOT(setPosition(int))); connect(ui->tableWidget, SIGNAL(cellClicked(int,int)), this, SLOT(playTo(int,int))); connect(player, SIGNAL(positionChanged(qint64)), this, SLOT(positionChanged(qint64))); connect(player, SIGNAL(durationChanged(qint64)), this, SLOT(durationChanged(qint64))); connect(playList, SIGNAL(currentIndexChanged(int)), this, SLOT(updateSongList(int))); connect(ui->action_SongList, SIGNAL(triggered()), this, SLOT(showOrHideSongList())); connect(ui->action_Import, SIGNAL(triggered()), this, SLOT(importSongs())); connect(ui->action_deleteSelectedMusic, SIGNAL(triggered()), this, SLOT(deleteSelectedMusic())); connect(ui->action_Last, SIGNAL(triggered()), this, SLOT(playLast())); connect(ui->action_Play, SIGNAL(triggered()), this, SLOT(playOrPause())); connect(ui->action_Stop, SIGNAL(triggered()), player, SLOT(stop())); connect(ui->action_Next, SIGNAL(triggered()), this, SLOT(playNext())); connect(ui->action_SoundPlus, SIGNAL(triggered()), this, SLOT(plusSound())); connect(ui->action_SoundReduce, SIGNAL(triggered()), this, SLOT(reduceSound())); connect(ui->toolButton_Play, SIGNAL(clicked()), this, SLOT(playOrPause())); connect(ui->toolButton_Stop, SIGNAL(clicked()), player, SLOT(stop())); connect(ui->toolButton_Last, SIGNAL(clicked()), this, SLOT(playLast())); connect(ui->toolButton_Next, SIGNAL(clicked()), this, SLOT(playNext())); connect(ui->toolButton_SoundPlus,SIGNAL(clicked()),this,SLOT(plusSound())); connect(ui->toolButton_SoundReduce,SIGNAL(clicked()),this,SLOT(reduceSound())); connect(ui->toolButton_ImportSongs,SIGNAL(clicked()),this,SLOT(importSongs())); connect(ui->toolButton_support,SIGNAL(clicked()),this,SLOT(support())); connect(ui->toolButton_deleteSelectedMusic,SIGNAL(clicked()),this,SLOT(deleteSelectedMusic())); connect(ui->horizontalSlider_2, SIGNAL(sliderMoved(int)), this, SLOT(volumeStatusChange())); } MainWindow::~MainWindow() { delete ui; } void MainWindow::createContextMenu() { seperatorAction1=new QAction(this); seperatorAction1->setSeparator(true); seperatorAction2=new QAction(this); seperatorAction2->setSeparator(true); addAction(ui->action_SongList); addAction(ui->action_Import); addAction(ui->action_deleteSelectedMusic); addAction(seperatorAction1); addAction(ui->action_Last); addAction(ui->action_Play); addAction(ui->action_Stop); addAction(ui->action_Next); addAction(seperatorAction2); addAction(ui->action_SoundPlus); addAction(ui->action_SoundReduce); setContextMenuPolicy(Qt::ActionsContextMenu); } void MainWindow::mousePressEvent(QMouseEvent *event) { if(event->button()==Qt::LeftButton) { dragPos=event->globalPos()-frameGeometry().topLeft(); event->accept(); } } void MainWindow::mouseMoveEvent(QMouseEvent *event)//左键移动 { if(event->buttons()&Qt::LeftButton) { move(event->globalPos()-dragPos); event->accept(); } } void MainWindow::positionChanged(qint64 position) { ui->horizontalSlider->setValue(position); currentTime=new QTime(0,(position/60000)%60,(position/1000)%60); QString str =currentTime->toString("mm:ss")+"/"+totalTime->toString("mm:ss"); ui->timeLabel->setText(str); } void MainWindow::durationChanged(qint64 duration) { ui->horizontalSlider->setRange(0,duration); totalTime=new QTime(0,(duration/60000)%60,(duration/1000)%60); } void MainWindow::updateSongList(int i)//正在播放 { ui->tableWidget->selectRow(i); ui->label->setText(tr("正在播放: %1").arg(ui->tableWidget->item(i, 0)->text())); ui->timeLabel->setText(tr("00:00") + "/" + tr("00:00")); ui->timeLabel->setAlignment(Qt::AlignCenter); } void MainWindow::showOrHideSongList()//显示播放列表 { setAttribute(Qt::WA_TranslucentBackground); if(ui->tableWidget->isHidden()) { ui->tableWidget->show(); } else { ui->tableWidget->hide(); } } void MainWindow::playTo(int i,int ) { playList->setCurrentIndex(i); player->play(); } void MainWindow::importSongs()//导入歌曲 { QString initialName=QDir::homePath(); QStringList pathList=QFileDialog::getOpenFileNames(this, tr("选择文件"), initialName, tr("*.mp3")); for(int i=0; i<pathList.size(); ++i) { QString path=QDir::toNativeSeparators(pathList.at(i)); if(!path.isEmpty()) { playList->addMedia(QUrl::fromLocalFile(path)); QString fileName=path.split("\\").last(); int rownum=ui->tableWidget->rowCount(); ui->tableWidget->insertRow(rownum); ui->tableWidget->setItem(rownum, 0, new QTableWidgetItem(fileName.split(".").front())); } } } void MainWindow::deleteSelectedMusic()//删除播放列表歌曲 { QTableWidgetItem * item = ui->tableWidget->currentItem(); if (item == Q_NULLPTR)return; playList->removeMedia(ui->tableWidget->currentRow()); ui->tableWidget->removeRow(item->row()); //emit isModified(); //emit playlistReduced(); } void MainWindow::playLast()//播放 { int currentIndex=playList->currentIndex(); if(--currentIndex<0) currentIndex=0; playList->setCurrentIndex(currentIndex); player->play(); } void MainWindow::playOrPause()//暂停 { if(ui->toolButton_Play->text()==tr("播放")) { player->play(); ui->toolButton_Play->setText(tr("暂停")); } else { player->pause(); ui->toolButton_Play->setText(tr("播放")); } } void MainWindow::playNext()//下一首 { int currentIndex=playList->currentIndex(); if(++currentIndex==playList->mediaCount()) currentIndex=0; playList->setCurrentIndex(currentIndex); player->play(); } void MainWindow::plusSound()//增大音量 { volume+=20; if(volume>=100) { volume=100; ui->action_SoundPlus->setEnabled(false); } player->setVolume(volume); if(!ui->action_SoundReduce->isEnabled()) ui->action_SoundReduce->setEnabled(true); } void MainWindow::reduceSound()//减小音量 { volume-=20; if(volume<=0) { volume=0; ui->action_SoundReduce->setEnabled(false); } player->setVolume(volume); if(!ui->action_SoundPlus->isEnabled()) ui->action_SoundPlus->setEnabled(true); } void MainWindow::setPosition(int position) { player->setPosition(position); } void MainWindow::volumeStatusChange() { if (player->isMuted()){ player->setMuted(false); } else { player->setMuted(true); } } void MainWindow::support() { QMessageBox::about(this, tr("关于"), tr("感谢您使用宇宙听听！ 制作人：李丞")); }