QT应用编程: 鼠标拖动文件到应用程序窗口

class Widget : public QWidget
{
    Q_OBJECT
public:
    Widget(QWidget *parent = nullptr);
    ~Widget();
    ............
protected:
    ..........
    void dragEnterEvent(QDragEnterEvent *e);
    void dropEvent(QDropEvent *e);
}
Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
    .................
    setAcceptDrops(true);
}
void Widget::dragEnterEvent(QDragEnterEvent *e)
{
    if (e->mimeData()->hasUrls())
    {
        e->acceptProposedAction();
    }
}
void Widget::dropEvent(QDropEvent *e)
{
    foreach (const QUrl &url, e->mimeData()->urls())
    {
        QString fileName = url.toLocalFile();
        qDebug() << "拖入的文件名称:" << fileName;
        ...........
    }
}