QListWidget的item上实现右键菜单

QListWidget的item上实现右键菜单.md

    void ListWidget::contextMenuEvent ( QContextMenuEvent * event )
    {
        QMenu* popMenu = new QMenu(this);
        popMenu->addAction(new QAction("添加", this));
        popMenu->addAction(new QAction("删除", this));
        if(this->itemAt(mapFromGlobal(QCursor::pos())) != NULL) //如果有item则添加"修改"菜单 [1]*
        {
            popMenu->addAction(new QAction("修改", this));
        }
        
        popMenu->exec(QCursor::pos()); // 菜单出现的位置为当前鼠标的位置
    }