Qt5开发视频播放器的项目实践

#ifndef WIDGET_H
#define WIDGET_H
#include <QWidget>
#include <QMediaPlayer>  //播放器
#include <QVideoWidget>  //播放窗口
#include <QMediaPlaylist>//播放列表
#include <QString>
#include <QFileDialog>//文件窗口
#include <QDebug>
#include <QResizeEvent>
#include <QMouseEvent>
#include <QKeyEvent>
#include <QListWidgetItem>
#include <QObject>
#include <QAbstractEventDispatcher>
#include "globalkeyfilter.h"
namespace Ui
{
class Widget;
}
class QMediaPlayer;
class QMediaPlaylist;
class QVideoWidget;
class Widget : public QWidget
{
    Q_OBJECT
public:
    explicit Widget(QWidget* parent = 0);
    void setget_Alltime(qint64 playtime);//获取视频时长并设置到标签
    void setget_currenttime(qint64 playtime);//获取当时播放位置并设置
    void settimeslider(qint64 playtime);//设置进度条
    void exitFullScreen();  // 退出全屏
    void togglePlayback();  // 暂停/播放
    ~Widget();
private slots:
    void on_btn_open_clicked();//打开音视频
    void on_btn_start_clicked();//播放
    void on_voice_control_valueChanged(int value);//控制声音
    void on_btn_fullshow_clicked();//全屏显示
    void getduration(qint64 playtime);   //获取时间改变信号
    void getposition(qint64 playtime);   //获取当前播放位置
    void on_btn_ht_clicked();//上一个音视频
    void on_btn_qj_clicked();//下一个音视频
    void on_listWidget_doubleClicked(const QModelIndex& index);
private:
    Ui::Widget* ui;
    QStringList         m_strlist;          //文件名列表
    QMediaPlayer*       m_pMediaPlayer;     //播放器
    QVideoWidget*       m_pVideoWidget;     //播放窗口
    QMediaPlaylist*     m_MediaPlaylist;    //播放列表
    QMediaPlayer::State m_state;            //播放状态
    int m_hour;                             //视频总时长
    int m_munete;                           //分钟
    int m_second;                           //秒
    bool m_sliderstate;                     //滑块是否被选中的状态
    int m_slider_crtval;                    //滑块当前值
    GlobalKeyFilter* m_globalKeyFilter;     //  GlobalKeyFilter 类
};
#endif // WIDGET_H

#ifndef MYSLIDER_H
#define MYSLIDER_H
#include <QMouseEvent>
#include <QSlider>
class MySlider : public QSlider
{
    Q_OBJECT
public:
    explicit MySlider(QWidget* parent = nullptr);
protected:
    void mousePressEvent(QMouseEvent* ev);
    void mouseReleaseEvent(QMouseEvent* ev);
signals:
    void mousepress(int value);
    void mouserelease(int value);
};
#endif // MYSLIDER_H

#include "globalkeyfilter.h"
#include "widget.h"
#include <QKeyEvent>
#include <Windows.h>
GlobalKeyFilter::GlobalKeyFilter(Widget* widget) : m_widget(widget)
{
    qDebug() << "键盘监听事件启动了" << "\n";
}
bool GlobalKeyFilter::nativeEventFilter(const QByteArray& eventType, void* message, long* result)
{
    if (eventType == "windows_generic_MSG")
    {
        MSG* msg = static_cast<MSG*>(message);
        if (msg->message == WM_KEYDOWN)
        {
            int key = msg->wParam;
            // 处理 ESC 键
            if (key == VK_ESCAPE)
            {
                if (m_widget)
                {
                    m_widget->exitFullScreen();
                }
            }
            // 处理空格键
            if (key == VK_SPACE)
            {
                m_widget->togglePlayback();
            }
        }
    }
    // 返回 false 以便继续传递事件
    return false;
}