QTableWidget学习

一、这次项目需要用到，可以在tablewidget中添加item，并且可以通过鼠标的右键选项进行一些打开、删除等操作。

1、在构造函数中定制右键菜单选项

ui.tableWidget_2->setSelectionBehavior(QAbstractItemView::SelectRows); //设置选择行为，以行为单位
ui.tableWidget_2->setSelectionMode(QAbstractItemView::SingleSelection); //设置选择模式，选择单行
openAction = new QAction("打开文件",this);
deleteAction = new QAction("删除文件", this);
closeAction = new QAction("退出菜单",this);
openAction->setShortcut(QKeySequence::Open);//设置打开快捷键
deleteAction->setShortcut(QKeySequence::Delete);
closeAction->setShortcut(QKeySequence::Quit);
ui.tableWidget_2->setContextMenuPolicy(Qt::CustomContextMenu);//设置上下文显示菜单的方式,Qt::CustomContextMenu是唯一与右键菜单相关的参数。
pMenu = new QMenu(ui.tableWidget_2);
pMenu->addAction(openAction);
pMenu->addAction(deleteAction);
pMenu->addAction(closeAction);

connect(openAction, SIGNAL(triggered(void)), this, SLOT(openActionSlot(void)));
connect(deleteAction, SIGNAL(triggered(void)), this, SLOT(deleteActionSlot(void)));
connect(closeAction, SIGNAL(triggered(void)), this, SLOT(closeActionSlot(void)));
/*This signal is emitted when the widget's contextMenuPolicy is Qt::CustomContextMenu, and the user has requested a context menu on the widget*/
connect(ui.tableWidget_2, SIGNAL(customContextMenuRequested(QPoint)), this, SLOT(customContextMenuRequestedSlot(QPoint)));　　//customContextMenuRequested(QPoint)信号是鼠标右击的时候产生的（注意，contextMenuPolicy必须是Qt：：CustomContextMenu， 并且用户已经请求了一个上下文菜单

/*如下是一些槽函数的定义*/
void MyFtp::customContextMenuRequestedSlot(QPoint point)
{
    pMenu->exec(QCursor::pos());    //运行并且显示右键菜单栏
}
void MyFtp::openActionSlot(void)
{
    int row = ui.tableWidget_2->currentRow();
    if (row!=-)
        chosedFilePath = ui.tableWidget_2->item(row,)->text();
    QProcess process;
    //process.startDetached(QString("explorer.exe /select,"+chosedFilePath));//注意，在切换盘符的时候将无法获取正确结果
#ifdef WIN32
    chosedFilePath.replace("/", "\\");    //***这句windows下必要***
#endif
    process.startDetached("explorer /select," + chosedFilePath);　　//打开指定目录，并选定指定文件
}

2、为tablewidget添加项目

ui.tableWidget_2->setItem(j*fileNameList.size() + i,,new QTableWidgetItem(QString::number(chosedCarNum[j])));

在添加项目前如果需要清空之前添加的项目则加如下代码：

int rowCount = ui.tableWidget_2->rowCount();
for (int i = rowCount - ; i >= ; i--)
　　ui.tableWidget_2->removeRow(i);