使用Qt编写一个简易的音乐播放器

#include "mediaplayerwidget.h" #include "ui_mediaplayerwidget.h" #include <QDebug> MediaPlayerWidget::MediaPlayerWidget(QWidget *parent) : QWidget(parent),playSataFalge(false),SliderPFlage(false), ui(new Ui::MediaPlayerWidget) { ui->setupUi(this); MediaPlayer = new QMediaPlayer(this); //实例化播放器对象 MediaPlaylist =new QMediaPlaylist(this); //实例化歌单对象 MediaPlayer->setPlaylist(MediaPlaylist); //音乐播放器设置歌单 MediaPlaylist->setCurrentIndex(0); //初始状态 MediaPlayer->setVolume(50); ui->VolDial->setValue(50); connect(MediaPlayer,SIGNAL(currentMediaChanged(const QMediaContent &)),this,SLOT(currentMediaChangedSlot(const QMediaContent &))); connect(MediaPlayer,SIGNAL(durationChanged(qint64)),this,SLOT(currentdurationChangedSlot(qint64))); connect(MediaPlayer,SIGNAL(positionChanged(qint64)),this,SLOT(horizontalSliderPositionChanged(qint64))); } MediaPlayerWidget::~MediaPlayerWidget() { delete ui; delete MediaPlayer; } //添加歌单 void MediaPlayerWidget::on_AddPushButton_clicked() { QStringList MP3files = QFileDialog::getOpenFileNames(this,"选择音乐文件",".","音乐文件 (*.mp3 *.mp4 *.MP3)"); for(int i =0;i<MP3files.count();i++) { MediaPlaylist->addMedia(QUrl(MP3files.at(i))); ui->MediaplayListWidget->addItem(MP3files.at(i)); } } void MediaPlayerWidget::on_PlayAndStopPushButton_clicked() { if(!MediaPlaylist->isEmpty()) { if(!playSataFalge) { MediaPlayer->play(); playSataFalge = true; ui->PlayAndStopPushButton->setText("停止播放"); } else { MediaPlayer->stop(); playSataFalge = false; ui->PlayAndStopPushButton->setText("播放音乐"); } } else { QMessageBox::warning(this,"播放器警告","歌单中未有音乐无法实现播放，请添加音乐"); } } void MediaPlayerWidget::on_UpPushButton_clicked() { MediaPlaylist->previous(); } void MediaPlayerWidget::on_DownPushButton_clicked() { MediaPlaylist->next(); } void MediaPlayerWidget::on_VolDial_valueChanged(int value) { MediaPlayer->setVolume(value); } //list窗口进行单击选择 void MediaPlayerWidget::on_MediaplayListWidget_currentRowChanged(int currentRow) { if(currentRow < ui->MediaplayListWidget->count()) MediaPlaylist->setCurrentIndex(currentRow); } void MediaPlayerWidget::currentMediaChangedSlot(const QMediaContent &item) { //统计当前歌曲的时长 } //持续时间改变 void MediaPlayerWidget::currentdurationChangedSlot(qint64 duration) { ui->horizontalSlider->setMaximum(duration); } void MediaPlayerWidget::horizontalSliderPositionChanged(qint64 Position) { if(!SliderPFlage) { ui->horizontalSlider->setValue(Position); } } void MediaPlayerWidget::on_horizontalSlider_sliderPressed() { SliderPFlage=true; } void MediaPlayerWidget::on_horizontalSlider_sliderReleased() { SliderPFlage=false; MediaPlayer->setPosition(ui->horizontalSlider->value()); } void MediaPlayerWidget::on_horizontalSlider_valueChanged(int value) { }