有上传本地音乐文件,播放,暂停,拖拉进度条等功能的播放器。
mainwindow.cpp
cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QMediaPlayer>
#include <QFileDialog>
#include <QTime>
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
, ui(new Ui::MainWindow)
{
ui->setupUi(this);
player = new QMediaPlayer(this);
// 当播放状态改变时,更新按钮的状态
connect(player,&QMediaPlayer::stateChanged,this,&MainWindow::onStateChanged);
// 当音乐文件的总时间改变时,更新滑块的范围
connect(player, &QMediaPlayer::durationChanged, ui->slider, &QSlider::setMaximum);
// 当播放位置改变时,更新滑块的值
connect(player, &QMediaPlayer::positionChanged, ui->slider, &QSlider::setValue);
// 当滑块的值改变时,设置播放位置
connect(ui->slider, &QSlider::valueChanged, player, &QMediaPlayer::setPosition);
connect(ui->slider, &QSlider::valueChanged, [this](int value) {
// 将滑块的值转换为时间格式,并更新 timelabel
QTime time(0, value / 60, value % 60);
ui->timelabel->setText(time.toString("mm:ss"));
});
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::on_playButton_clicked()
{
//if(player->state() == QMediaPlayer::PlayingState)
//{
//player->pause();
//}else{
//player->play();
//}
player->play();
}
void MainWindow::onStateChanged(QMediaPlayer::State state)
{
//if(state == QMediaPlayer::PlayingState)
//{
//ui->playButton->setText("Pause");
//}
//else
//{
//ui->playButton->setText("Play");
//}
}
void MainWindow::on_openAction_triggered()
{
QString filename = QFileDialog::getOpenFileName(this, "Open a File", "", "Audio File(*.mp3)");
player->setMedia(QUrl::fromLocalFile(filename));
player->play();
}
void MainWindow::on_pauseButton_clicked()
{
player->pause();
}
void MainWindow::on_OpenFileButton_clicked()
{
on_openAction_triggered();
}
void MainWindow::on_slider_actionTriggered(int action)
{
}
void MainWindow::on_timelabel_linkActivated(const QString &link)
{
}
.h:
cpp
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include <QMediaPlayer>
QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
MainWindow(QWidget *parent = nullptr);
~MainWindow();
private slots:
void on_timelabel_linkActivated(const QString &link);
void on_playButton_clicked();
void on_slider_actionTriggered(int action);
void on_pauseButton_clicked();
void onStateChanged(QMediaPlayer::State state);
void on_openAction_triggered();
void on_OpenFileButton_clicked();
private:
Ui::MainWindow *ui;
QMediaPlayer *player;
};
#endif // MAINWINDOW_H
.pro:
cpp
QT += core gui
QT += multimedia
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
CONFIG += c++11
# The following define makes your compiler emit warnings if you use
# any Qt feature that has been marked deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS
# You can also make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0
SOURCES += \
main.cpp \
mainwindow.cpp
HEADERS += \
mainwindow.h
FORMS += \
mainwindow.ui
# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target