Qt音乐播放器 支持歌曲导入 歌词显示 音量控制

#include "widget.h" #include "ui_widget.h" #include <QFileDialog> #include <QString> #include <QStringList> #include <QMenu> Widget::Widget(QWidget *parent) : QWidget(parent), ui(new Ui::Widget) { ui->setupUi(this); ui->volumeSlider->setRange(0,100); this->setWindowTitle(tr("音乐播放器")); this->playList=new QMediaPlaylist(this); playList->setPlaybackMode(QMediaPlaylist::Loop); this->player=new QMediaPlayer(this); player->setPlaylist(playList); player->setVolume(50); ui->volumeSlider->setValue(50); ui->songsList->setStyleSheet("background-color:transparent;color: white;"); ui->addSongsButton->setStyleSheet("QPushButton{background: transparent;}"); ui->addSongsButton->setFlat(true); ui->clearButton->setStyleSheet("QPushButton{background: transparent;}"); ui->clearButton->setFlat(true); ui->delectButton->setStyleSheet("QPushButton{background: transparent;}"); ui->delectButton->setFlat(true); ui->volumeButton->setStyleSheet("QPushButton{background: transparent;}"); ui->volumeButton->setText(" "); ui->volumeButton->setFlat(true); connect(ui->volumeSlider,SIGNAL(valueChanged(int)),this,SLOT(setVol(int))); connect(ui->addSongsButton,SIGNAL(clicked()),this,SLOT(addSongs())); connect(ui->playPauseButton,SIGNAL(clicked()),this,SLOT(playPause())); connect(ui->previousButton,SIGNAL(clicked()),this,SLOT(playPrevious())); connect(ui->nextButton,SIGNAL(clicked()),this,SLOT(playNext())); connect(player,SIGNAL(durationChanged(qint64)),this,SLOT(durChanged(qint64))); connect(player,SIGNAL(positionChanged(qint64)),this,SLOT(posChanged(qint64))); connect(ui->processSlider,SIGNAL(valueChanged(int)),this,SLOT(setPos(int))); connect(ui->clearButton,SIGNAL(clicked()),this,SLOT(clearList())); connect(ui->delectButton,SIGNAL(clicked()),this,SLOT(delectSong())); connect(ui->volumeButton,SIGNAL(clicked()),this,SLOT(volumeSilence())); ui->playPauseButton->setStyleSheet("QPushButton{background: transparent;}"); ui->playPauseButton->setFlat(true); ui->playPauseButton->setText(" "); ui->previousButton->setStyleSheet("QPushButton{background: transparent;}"); ui->previousButton->setFlat(true); ui->nextButton->setStyleSheet("QPushButton{background: transparent;}"); ui->nextButton->setFlat(true); action_hideShow=new QAction(tr("隐藏/显示窗口部件"),this); action_addSongs=new QAction(tr("添加本地歌曲"),this); action_playPause=new QAction(tr("播放/暂停"),this); action_stop=new QAction(tr("停止"),this); action_previous=new QAction(tr("上一曲"),this); action_next=new QAction(tr("下一曲"),this); action_addVolume=new QAction(tr("音量+(5%)"),this); action_redVolume=new QAction(tr("音量-(5%)"),this); action_quit=new QAction(tr("退出"),this); connect(action_hideShow,SIGNAL(triggered()),this,SLOT(hideShow())); connect(action_addSongs,SIGNAL(triggered()),this,SLOT(addSongs())); connect(action_playPause,SIGNAL(triggered()),this,SLOT(playPause())); connect(action_previous,SIGNAL(triggered()),this,SLOT(playPrevious())); connect(action_next,SIGNAL(triggered()),this,SLOT(playNext())); connect(action_addVolume,SIGNAL(triggered()),this,SLOT(addVolume())); connect(action_redVolume,SIGNAL(triggered()),this,SLOT(redVolume())); connect(action_quit,SIGNAL(triggered()),this,SLOT(close())); ui->label->setAlignment(Qt::AlignCenter); ui->label_2->setAlignment(Qt::AlignCenter); ui->label_3->setAlignment(Qt::AlignCenter); } Widget::~Widget() { delete ui; } //每当音量进度条改变，会触发这个槽函数重新设置音量大小 void Widget::setVol(int vol) { player->setVolume(vol); } //选择要添加的所有歌曲，添加到QStringList中，遍历QStringList中的所有.MP3文件 //添加到playList中，并且添加到ui界面的QlistWight中 void Widget::addSongs() { QStringList songsList=QFileDialog::getOpenFileNames(this,"选择文件",QDir::homePath(),"*.mp3"); for(int i=0;i<songsList.size();i++) { QString song=songsList.at(i); qDebug()<<song; //歌词存放路径 playPath =song.left(song.lastIndexOf("/")); qDebug()<<playPath; this->playList->addMedia(QUrl::fromLocalFile(song)); QStringList songL=song.split('/'); song=songL.last(); ui->songsList->addItem(song); } } //播放/暂停 void Widget::playPause() { ui->processSlider->setEnabled(true); if(" "==ui->playPauseButton->text()) { int index=ui->songsList->currentRow(); if(-1!=index) { //歌曲名字 QString songname =ui->songsList->item(index)->text().left(ui->songsList->item(index)->text().lastIndexOf(".")); playList->setCurrentIndex(index); player->play(); ui->playPauseButton->setText("\n"); ui->label_background->setStyleSheet("background-image: url(:/pic/音乐播放器-背景播放.png);"); // 读取歌词文件 if(!lyrics.readLyricsFile(playPath+"/"+songname+".lrc")){ ui->label->setText(" 未检测到歌词文件"); ui->label_2->setText("请检查歌词文件是否存在"); } lyricsID = 0; } } else { player->pause(); ui->playPauseButton->setText(" "); ui->label_background->setStyleSheet("background-image: url(:/pic/音乐播放器-背景停止.png);"); // 清空歌词 // ui->label->clear(); // ui->label_2->clear(); lyrics.listLyricsText.clear(); } } //播放上一曲 void Widget::playPrevious() { player->stop(); int index=playList->currentIndex(); if(0==index) index=playList->mediaCount()-1; else index--; playList->setCurrentIndex(index); ui->songsList->setCurrentRow(index); ui->playPauseButton->setText(" "); ui->label_background->setStyleSheet("background-image: url(:/pic/音乐播放器-背景播放.png);"); // 清空歌词 ui->label->clear(); ui->label_2->clear(); ui->label_3->clear(); lyrics.listLyricsText.clear(); } //播放下一曲 void Widget::playNext() { player->stop(); int index=playList->currentIndex(); if(index==playList->mediaCount()-1) index=0; else index++; playList->setCurrentIndex(index); ui->songsList->setCurrentRow(index); ui->playPauseButton->setText(" "); ui->label_background->setStyleSheet("background-image: url(:/pic/音乐播放器-背景播放.png);"); // 清空歌词 ui->label->clear(); ui->label_2->clear(); ui->label_3->clear(); lyrics.listLyricsText.clear(); } //设置进度条显示范围，并计算歌曲总时间，显示出来 void Widget::durChanged(qint64 dur) { ui->processSlider->setRange(0,dur); totalTime.clear(); dur/=1000; totalTime+=QString::number(dur/60); totalTime+=':'; if(dur%60<10) totalTime+='0'; totalTime+=QString::number(dur%60); ui->totalTimeLabel->setText(totalTime); } //设置进度条的值，并计算当前时间，显示出来 void Widget::posChanged(qint64 pos) { presentTime.clear(); ui->processSlider->setValue(pos); pos/=1000; presentTime+=QString::number(pos/60); presentTime+=':'; if(pos%60<10) presentTime+='0'; presentTime+=QString::number(pos%60); ui->presentTimeLabel->setText(presentTime); if(presentTime==totalTime) { presentTime.clear(); player->stop(); ui->label->clear(); ui->label_2->clear(); ui->label_3->clear(); } } //根据播放进度的改变设置播放进度 void Widget::setPos(int pos) { setPlayTime(); } //清空播放列表 void Widget::clearList() { playList->clear(); ui->songsList->clear(); } //在播放列表中删除某首