Qt 给按钮添加右键菜单

 

btn->setContextMenuPolicy(Qt::CustomContextMenu);
connect(btn, SIGNAL(customContextMenuRequested(const QPoint&)), this, SLOT(showMenu(const QPoint&)));

void BookmarkLabel::showMenu(const QPoint& point)
{
　　QPoint globalPos = this->mapToGlobal(point);
　　m_pMenu->exec(QPoint(globalPos.x(), globalPos.y());
}