详解QTreeWidget隐藏节点的两种方式

	// 这里我们默认树的节点只有一列;
	m_rootItem->setText(0, "");
	m_rootItem->setSizeHint(0, QSize(1, 1));
	Qt::ItemFlags flags = m_rootItem->flags();
	m_rootItem->setFlags(flags | Qt::ItemNeverHasChildren);

#include <QtWidgets/QWidget>
#include <QTreeWidget>
#include <QToolButton>

class MyTreeWidget : public QWidget
{
    Q_OBJECT

public:
    MyTreeWidget(QWidget *parent = Q_NULLPTR);

private:
	void initWgt();
	void initTreeData();

private slots:
	void onBtnClicked();

private:
	QTreeWidget* m_treeWgt;
	QToolButton* m_pBtnControl;

	QTreeWidgetItem* m_rootItem;
};

#include "MyTreeWidget.h"
#include <QVBoxLayout>
#include <QDebug>

#pragma execution_character_set("utf-8")

MyTreeWidget::MyTreeWidget(QWidget *parent)
    : QWidget(parent)
{
	initWgt();
	initTreeData();
}

void MyTreeWidget::initWgt()
{
	m_treeWgt = new QTreeWidget;
	m_treeWgt->setHeaderHidden(true);
	
	m_pBtnControl = new QToolButton;
	m_pBtnControl->setText("隐藏根节点");

	QVBoxLayout* vLayout = new QVBoxLayout(this);
	vLayout->addWidget(m_treeWgt);
	vLayout->addWidget(m_pBtnControl);

	connect(m_pBtnControl, &QToolButton::clicked, this, &MyTreeWidget::onBtnClicked);
}

void MyTreeWidget::initTreeData()
{
	QTreeWidgetItem* m_rootItem1 = new QTreeWidgetItem(m_treeWgt);
	m_rootItem1->setText(0, "Root0");

	m_rootItem = new QTreeWidgetItem(m_treeWgt);
	m_rootItem->setText(0, "Root1");

	QTreeWidgetItem* item1 = new QTreeWidgetItem(m_rootItem);
	item1->setText(0, "Node1");

	QTreeWidgetItem* item2 = new QTreeWidgetItem(m_rootItem);
	item2->setText(0, "Node2");
	QTreeWidgetItem* item21 = new QTreeWidgetItem(item2);
	item21->setText(0, "Node21");
	QTreeWidgetItem* item22 = new QTreeWidgetItem(item2);
	item22->setText(0, "Node22");

	QTreeWidgetItem* item3 = new QTreeWidgetItem(m_rootItem);
	item3->setText(0, "Node3");
	QTreeWidgetItem* item31 = new QTreeWidgetItem(item3);
	item31->setText(0, "Node31");
	QTreeWidgetItem* item32 = new QTreeWidgetItem(item3);
	item32->setText(0, "Node32");

	for (int i = 0; i < 10; i++)
	{
		QTreeWidgetItem* item = new QTreeWidgetItem(m_rootItem);
		item->setText(0, "Node");
	}

	m_rootItem->setExpanded(true);

	QTreeWidgetItem* itemTmp = new QTreeWidgetItem(m_treeWgt);
	itemTmp->setText(0, "Root2");
	QTreeWidgetItem* itemTmp1 = new QTreeWidgetItem(itemTmp);
	itemTmp1->setText(0, "NodeTmp");
}

void MyTreeWidget::onBtnClicked()
{
	// 直接隐藏;
// 	bool isHide = m_rootItem->isHidden();
// 	m_rootItem->setHidden(!isHide);

	// 间接隐藏;
	m_rootItem->setText(0, "");
	m_rootItem->setSizeHint(0, QSize(0, 0));
	Qt::ItemFlags flags = m_rootItem->flags();
	m_rootItem->setFlags(flags | Qt::ItemNeverHasChildren);

	bool isHide = m_rootItem->isHidden();
	qDebug() << isHide;
}