Qt之QTreeWidget入门

时间：2021-07-26 14:27:03

QTreeWidget的一些基本操作

1.insertTopLevelItems，insertTopLevelItem用来添加顶层的item

QTreeWidget *treeWidget = new QTreeWidget(this);//创建

treeWidget->setColumnCount();  //设置列

treeWidget->setHeaderLabel(tr("item tree"));    //设置标题

treeWidget->setGeometry(,,this->width(),this->height());  //设置大小

QList<QTreeWidgetItem *> items;

//创建两个节点

QTreeWidgetItem *fItem1 = new QTreeWidgetItem(treeWidget,QStringList(QString("f1")));

QTreeWidgetItem *fItem2 = new QTreeWidgetItem(treeWidget,QStringList(QString("f2")));

items.append(fItem1);

items.append(fItem2);

//添加顶层节点

treeWidget->insertTopLevelItems(,items);

//节点始终保持展开

treeWidget->setItemsExpandable(false);

treeWidget->expandAll();

2.父节点通过addChild增加子节点

//创建子节点

QTreeWidgetItem *fItem1a = new QTreeWidgetItem(fItem1,QStringList(QString("f1a")));

QTreeWidgetItem *fItem1b = new QTreeWidgetItem(fItem1,QStringList(QString("f1b")));

QTreeWidgetItem *fItem2a = new QTreeWidgetItem(fItem2,QStringList(QString("f2a")));

QTreeWidgetItem *fItem2b = new QTreeWidgetItem(fItem2,QStringList(QString("f2b")));

    //添加字节点

fItem1->addChild(fItem1a);

fItem1->addChild(fItem1b);

fItem2->addChild(fItem2a);

fItem2->addChild(fItem2b);

3.建立鼠标点击右键点击信号检测

//检测点击事件

    connect(treeWidget,SIGNAL(itemClicked(QTreeWidgetItem*,int)),this,SLOT(itemClick(QTreeWidgetItem*,int)));

    //检测鼠标右键

treeWidget->setContextMenuPolicy(Qt::CustomContextMenu);

connect(treeWidget,SIGNAL(customContextMenuRequested(const QPoint&)), this,SLOT(popMenu(const QPoint&)));

4.槽函数

void Widget::itemClick(QTreeWidgetItem *item, int column)

{

    QTreeWidgetItem *parent = item->parent();   //获取父节点

    if(NULL==parent) //注意：最顶端项是没有父节点的

        return;

    int col = parent->indexOfChild(item); //item在父项中的节点行号(从0开始)

}

//弹出菜单

void Widget::popMenu(const QPoint &)

{

    QTreeWidgetItem* curItem=treeWidget->currentItem();  //**获取当前被点击的节点

    if(curItem == NULL || curItem->parent() == NULL)

        return;           //右键的位置在空白位置右击或者点击的是顶层item

    //创建一个action

    QAction deleteItem(QString::fromLocal8Bit("&删除"),this);

    connect(&deleteItem, SIGNAL(triggered()), this, SLOT(deleteItem()));

    QPoint pos;

    //创建一个菜单栏

    QMenu menu(treeWidget);

    menu.addAction(&deleteItem);

    menu.exec(QCursor::pos());  //在当前鼠标位置显示

}

//删除item

void Widget::deleteItem()

{

    QTreeWidgetItem* curItem=treeWidget->currentItem();

    curItem->parent()->removeChild(treeWidget->currentItem());

}

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