qdialog无边框拖拽代码如何实现

可以使用以下代码实现qdialog无边框拖拽：

class CustomDialog : public QDialog
{
public:
    CustomDialog(QWidget *parent = 0) : QDialog(parent)
    {
        setWindowFlags(Qt::FramelessWindowHint);
        setAttribute(Qt::WA_TranslucentBackground);
    }

protected:
    void mousePressEvent(QMouseEvent *event)
    {
        if (event->button() == Qt::LeftButton) {
            m_dragging = true;
            m_dragPosition = event->globalPos() - frameGeometry().topLeft();
            event->accept();
        }
    }

    void mouseMoveEvent(QMouseEvent *event)
    {
        if (m_dragging && (event->buttons() & Qt::LeftButton)) {
            move(event->globalPos() - m_dragPosition);
            event->accept();
        }
    }

    void mouseReleaseEvent(QMouseEvent *event)
    {
        if (event->button() == Qt::LeftButton) {
            m_dragging = false;
            event->accept();
        }
    }

private:
    bool m_dragging;
    QPoint m_dragPosition;
};

这个代码可以让QDialog无边框，并且可以通过鼠标拖拽移动窗口。