在Qt中捕获拖动出口？

#include <QDrag>
#include <QMimeData>
#include <QMouseEvent>
#include <QPainter>

void CustomWidget::mousePressEvent(QMouseEvent *event)
{
    if (event->button() == Qt::LeftButton) {
        dragStartPosition = event->pos();
    }
}

void CustomWidget::mouseMoveEvent(QMouseEvent *event)
{
    if (!(event->buttons() & Qt::LeftButton))
        return;

    if ((event->pos() - dragStartPosition).manhattanLength()
        < QApplication::startDragDistance())
        return;

    QDrag *drag = new QDrag(this);
    QMimeData *mimeData = new QMimeData;
    mimeData->setText("your data here");
    drag->setMimeData(mimeData);

    QPixmap pixmap(":/path/to/your/pixmap.png");
    drag->setPixmap(pixmap);

    Qt::DropAction dropAction = drag->exec(Qt::CopyAction | Qt::MoveAction);
}

void CustomWidget::dropEvent(QDropEvent *event)
{
    if (event->mimeData()->hasText()) {
        QString text = event->mimeData()->text();
        // 处理拖放的数据
    }
    event->acceptProposedAction();
}