Qt 之tree widget和treeView控件C++语言

一、tree widget和tree View控件

其实tree widget和tree view这两个树型控件也是用的比较常见的控件之一，tree widget可以将另一个UI当成item插入到tree widget中。

二、tree widget添加父节点

QTreeWidgetItem *pWItem1 = new QTreeWidgetItem(ui.treeWidget);
pWItem1->setText(0, QString::fromLocal8Bit("人族"));
ui.treeWidget->addTopLevelItem(pWItem1);
QTreeWidgetItem *pWItem2 = new QTreeWidgetItem(ui.treeWidget);
pWItem2->setText(0, QString::fromLocal8Bit("兽族"));
ui.treeWidget->addTopLevelItem(pWItem2);
QTreeWidgetItem *pWItem3 = new QTreeWidgetItem(ui.treeWidget);
pWItem3->setText(0, QString::fromLocal8Bit("不死族"));
ui.treeWidget->addTopLevelItem(pWItem3);
QTreeWidgetItem *pWItem4 = new QTreeWidgetItem(ui.treeWidget);
pWItem4->setText(0, QString::fromLocal8Bit("精灵"));
ui.treeWidget->addTopLevelItem(pWItem4);

三、tree widget添加子节点

QTreeWidgetItem *item11 = new QTreeWidgetItem(pWItem1);
	item11->setText(0, QString::fromLocal8Bit("大法师"));
	QTreeWidgetItem *item12 = new QTreeWidgetItem(pWItem1);
	item12->setText(0, QString::fromLocal8Bit("MK"));
	QTreeWidgetItem *item13 = new QTreeWidgetItem(pWItem1);
	item13->setText(0, QString::fromLocal8Bit("帕拉丁"));
QTreeWidgetItem *item21 = new QTreeWidgetItem(pWItem2);
	item21->setText(0, QString::fromLocal8Bit("大法师"));
	QTreeWidgetItem *item22 = new QTreeWidgetItem(pWItem2);
	item22->setText(0, QString::fromLocal8Bit("MK"));
	QTreeWidgetItem *item23 = new QTreeWidgetItem(pWItem2);
	item23->setText(0, QString::fromLocal8Bit("帕拉丁"));
QTreeWidgetItem *item31 = new QTreeWidgetItem(pWItem3);
	item31->setText(0, QString::fromLocal8Bit("DK"));
	QTreeWidgetItem *item32 = new QTreeWidgetItem(pWItem3);
	item32->setText(0, QString::fromLocal8Bit("LICH"));
	QTreeWidgetItem *item33 = new QTreeWidgetItem(pWItem3);
	item33->setText(0, QString::fromLocal8Bit("小黑"));
QTreeWidgetItem *item41 = new QTreeWidgetItem(pWItem4);
	item41->setText(0, QString::fromLocal8Bit("DH"));
	QTreeWidgetItem *item42 = new QTreeWidgetItem(pWItem4);
	item42->setText(0, QString::fromLocal8Bit("那家"));
	QTreeWidgetItem *item43 = new QTreeWidgetItem(pWItem4);
	item43->setText(0, QString::fromLocal8Bit("KOG"));

四、tree widget点击事件获取内容关删除节点

connect(ui.treeWidget, SIGNAL(itemClicked(QTreeWidgetItem *, int)), this, SLOT(SktTreeItemClicked(QTreeWidgetItem *, int)));
void SktQtTest::SktTreeItemClicked(QTreeWidgetItem *item, int iCol)
{
	QString qsVal = item->text(iCol);
	QTreeWidgetItem *pParent = item->parent();
	if (NULL != pParent)
	{
		pParent->removeChild(item);
	}
	else {
		ui.treeWidget->removeItemWidget(item, iCol);
		delete item;
	}
}

选中某一个节点后需要判断当前节点是父节点还是子节点，如果是子节点，则通过父节点的removeChild函数删除子节点，如果是父节点则用treeWidget的removeItemWiget函数删除当前选中的父节点。

五、tree view添加父子节点

QStandardItemModel *pModel = new QStandardItemModel(this);
	pModel->setColumnCount(1);
	pModel->setHeaderData(0, Qt::Horizontal, QString::fromLocal8Bit("种族"));
	//pModel->setHeaderData(1, Qt::Horizontal, QString::fromLocal8Bit("首发"));
	//pModel->setHeaderData(2, Qt::Horizontal, QString::fromLocal8Bit("二发"));
	//pModel->setHeaderData(3, Qt::Horizontal, QString::fromLocal8Bit("三发"));
	//表头隐藏
	//ui.treeView->setHeaderHidden(true);
	ui.treeView->setModel(pModel);
	ui.treeView->expandAll();
	QStandardItem *pItem1 = new QStandardItem(QString::fromLocal8Bit("人族"));
	QStandardItem *pItem11Child = new QStandardItem(QString::fromLocal8Bit("大法师"));
	QStandardItem *pItem12Child = new QStandardItem(QString::fromLocal8Bit("MK"));
	QStandardItem *pItem13Child = new QStandardItem(QString::fromLocal8Bit("帕拉丁"));
	pItem1->setChild(0, pItem11Child);
	pItem1->setChild(1, pItem12Child);
	pItem1->setChild(2, pItem13Child);
	pModel->setItem(0, pItem1);
	QStandardItem *pItem2 = new QStandardItem(QString::fromLocal8Bit("兽族"));
	QStandardItem *pItem21Child = new QStandardItem(QString::fromLocal8Bit("先知"));
	QStandardItem *pItem22Child = new QStandardItem(QString::fromLocal8Bit("牛头"));
	QStandardItem *pItem23Child = new QStandardItem(QString::fromLocal8Bit("小Y"));
	pItem2->setChild(0, pItem21Child);
	pItem2->setChild(1, pItem22Child);
	pItem2->setChild(2, pItem23Child);
	pModel->setItem(1, pItem2);
	QStandardItem *pItem3 = new QStandardItem(QString::fromLocal8Bit("不死族"));
	QStandardItem *pItem31Child = new QStandardItem(QString::fromLocal8Bit("DK"));
	QStandardItem *pItem32Child = new QStandardItem(QString::fromLocal8Bit("LICH"));
	QStandardItem *pItem33Child = new QStandardItem(QString::fromLocal8Bit("小黑"));
	pItem3->setChild(0, pItem31Child);
	pItem3->setChild(1, pItem32Child);
	pItem3->setChild(2, pItem33Child);
	pModel->setItem(2, pItem3);
	QStandardItem *pItem4 = new QStandardItem(QString::fromLocal8Bit("精灵"));
	QStandardItem *pItem41Child = new QStandardItem(QString::fromLocal8Bit("DH"));
	QStandardItem *pItem42Child = new QStandardItem(QString::fromLocal8Bit("那家"));
	QStandardItem *pItem43Child = new QStandardItem(QString::fromLocal8Bit("TK"));
	pItem4->setChild(0, pItem41Child);
	pItem4->setChild(1, pItem42Child);
	pItem4->setChild(2, pItem43Child);
	pModel->setItem(3, pItem4);

六、tree view点击事件获取内容关删除节点

connect(ui.treeView, SIGNAL(clicked(const QModelIndex &)), this, SLOT(SktTreeViewItemClicked(const QModelIndex &)));
void SktQtTest::SktTreeViewItemClicked(const QModelIndex &index)
{
	QString qsVal = ui.treeView->model()->itemData(index).values()[0].toString();
	QStandardItemModel *pModel = static_cast<QStandardItemModel*>(ui.treeView->model());
	QStandardItem *pItem = pModel->itemFromIndex(index);
	if (NULL == pItem->parent())
	{
		pModel->removeRow(index.row());
		return;
	}
	QStandardItem *parent = pItem->parent();
	parent->removeRow(index.row());
}

首选获取选中的内容，然后判断是父节点还是子节点，不同的节点用不同的方法删除就可以了。

其实list view tree view list widget等这些控件都还有其他作用，欢迎大家一起探讨。