使用 QTreeWidget 实现复杂树控件功能的详细教程_treewidget 加控件-CSDN博客

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QTreeWidget>
namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

private:
    Ui::MainWindow *ui;
    QTreeWidget * treeWidget;
};

#endif // MAINWINDOW_H

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    treeWidget = new QTreeWidget;
    QVBoxLayout *layout = new QVBoxLayout();
    layout->addWidget(treeWidget);
    QWidget *centralWidget = new QWidget(this);
    centralWidget->setLayout(layout);
    setCentralWidget(centralWidget);

    treeWidget->setColumnCount(3);
    QStringList headers;

    headers << QString("班级")
            << QString("分配科目")
            << QString("是否达标");
    treeWidget->setHeaderLabels(headers);


    QTreeWidgetItem *item = new QTreeWidgetItem(treeWidget);
    item->setText(0, QString("某班级"));
    item->setCheckState(2, Qt::Unchecked);

    QTreeWidgetItem *topLevelItem = new QTreeWidgetItem(treeWidget);
    topLevelItem->setText(0, QString("顶层项目"));
    treeWidget->addTopLevelItem(topLevelItem);
}

MainWindow::~MainWindow()
{
    delete ui;
}

    QTreeWidgetItem *newTopLevelItem = new QTreeWidgetItem();
    newTopLevelItem->setText(0, QString("插入顶层项目"));
    newTopLevelItem->setText(1,"第1列");
    newTopLevelItem->setText(2,"第2列");
    treeWidget->insertTopLevelItem(0, newTopLevelItem);

    QTreeWidgetItem *childItem = new QTreeWidgetItem();
    childItem->setText(0, QString("子项目"));
    topLevelItem->addChild(childItem);

    QTreeWidgetItem *childItem1 = new QTreeWidgetItem();
    childItem1->setText(0, QString("子项目1"));
    topLevelItem->addChild(childItem1);

    topLevelItem->removeChild(childItem);

    QTreeWidgetItem *removedItem = treeWidget->takeTopLevelItem(0);
    delete removedItem;

    QTreeWidgetItem *childItem2 = new QTreeWidgetItem();
    childItem1->setText(1, QString("子项目2"));
    topLevelItem->addChild(childItem2);

一个demo：

 一个有两种类型的QTreeWidgetItem：节点和名称

可以添加节点，添加名称，删除，修改QTreeWidgetItem的名称

右键弹出菜单

（根据右键的位置：分3种：1.点击节点   2.点击名称 3.点击空白处）

弹出相关的菜单按钮

#ifndef MAINWINDOW1_H
#define MAINWINDOW1_H

#include <QMainWindow>
#include <QMenu>
#include <QTreeWidget>
namespace Ui {
class MainWindow1;
}

class MainWindow1 : public QMainWindow
{
    Q_OBJECT

    enum TreeItemType
    {
        none = 0,
        point = 1,
        name = 2
    };
public:
    explicit MainWindow1(QWidget *parent = 0);
    ~MainWindow1();

private slots:
    void on_actionAddPoint_triggered();

    void on_actionAddName_triggered();

    void PopMenu(QPoint);

    void on_actionDel_triggered();

    void on_actionChangeItemName_triggered();

private:
    void setActionsState(bool addPoint,bool addName,bool del,bool changeName);
    void RemoveItem(QTreeWidgetItem *pItem);
protected:

private:
    Ui::MainWindow1 *ui;
    int mPoint;
    int mName;
    QMenu* mMenu;
};

#endif // MAINWINDOW1_H

#include "mainwindow1.h"
#include "ui_mainwindow1.h"
#include <QMouseEvent>
#include <QInputDialog>
#include <QDebug>
MainWindow1::MainWindow1(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow1)
{
    ui->setupUi(this);
    ui->treeWidget->setHeaderLabel("HeaderLabel");
    ui->treeWidget->setContextMenuPolicy(Qt::CustomContextMenu);

    connect(ui->treeWidget,&QTreeWidget::customContextMenuRequested,this,&MainWindow1::PopMenu);

    mMenu = new QMenu(this);
    mMenu->addAction(ui->actionAddPoint);
    mMenu->addAction(ui->actionAddName);
    mMenu->addAction(ui->actionDel);
    mMenu->addAction(ui->actionChangeItemName);
    mPoint = 0;
    mName = 0;

}

MainWindow1::~MainWindow1()
{
    delete ui;
}

void MainWindow1::on_actionAddPoint_triggered()
{
    QTreeWidgetItem *Item = ui->treeWidget->currentItem();
    if(Item == nullptr)
    {
        QStringList strList;
        strList<<QString("节点%1").arg(mPoint);
        QTreeWidgetItem* pItem = new QTreeWidgetItem(strList);
        pItem->setData(0,Qt::UserRole+1,TreeItemType::point);
        ui->treeWidget->addTopLevelItem(pItem);
        mPoint++;
    }
    else
    {
        QStringList strList;
        strList<<QString("节点%1").arg(mPoint);
        QTreeWidgetItem* pItem = new QTreeWidgetItem(strList);
        pItem->setData(0,Qt::UserRole+1,TreeItemType::point);
        Item->addChild(pItem);
        mPoint++;
    }
}

void MainWindow1::on_actionAddName_triggered()
{
    QTreeWidgetItem *Item = ui->treeWidget->currentItem();
    if(Item == nullptr)
    {
        QStringList strList;
        strList<<QString("名称%1").arg(mName);
        QTreeWidgetItem* pItem = new QTreeWidgetItem(strList);
        pItem->setData(0,Qt::UserRole+1,TreeItemType::name);
        ui->treeWidget->addTopLevelItem(pItem);
        mName++;
    }
    else
    {
        QStringList strList;
        strList<<QString("名称%1").arg(mName);
        QTreeWidgetItem* pItem = new QTreeWidgetItem(strList);
        pItem->setData(0,Qt::UserRole+1,TreeItemType::name);
        Item->addChild(pItem);
        mName++;
    }
}

void MainWindow1::PopMenu(QPoint pos)
{
    QModelIndex index = ui->treeWidget->indexAt(pos);
    if(!index.isValid())
    {
        ui->treeWidget->setCurrentIndex(QModelIndex());
    }
    QTreeWidgetItem *pItem = ui->treeWidget->currentItem();
    if(nullptr == pItem)
    {
        setActionsState(1,1,0,0);
    }
    else
    {
        TreeItemType type = (TreeItemType)pItem->data(0,Qt::UserRole+1).toInt();
        switch (type) {
        case TreeItemType::point:
            setActionsState(1,1,1,1);
            break;
        case TreeItemType::name:
            setActionsState(0,0,1,1);
            break;
        default:
            break;
        }
        qDebug()<<pItem->text(0).toStdString().c_str();
    }
    mMenu->exec(QCursor::pos());
}



void MainWindow1::on_actionDel_triggered()
{
    QTreeWidgetItem *pItem = ui->treeWidget->currentItem();
    if(nullptr == pItem)
    {

    }
    else
    {
        RemoveItem(pItem);
    }
}



void MainWindow1::on_actionChangeItemName_triggered()
{
    QTreeWidgetItem *pItem = ui->treeWidget->currentItem();
    TreeItemType type = (TreeItemType)pItem->data(0,Qt::UserRole+1).toInt();
    QString str;
    switch (type) {
    case TreeItemType::point:
        str="节点";
        break;
    case TreeItemType::name:
        str="名称";
        break;
    default:
        break;
    }
    QInputDialog dialog;
    dialog.exec();
    pItem->setData(0,Qt::DisplayRole,str+dialog.textValue());
}

void MainWindow1::setActionsState(bool addPoint, bool addName, bool del, bool changeName)
{
    ui->actionAddPoint->setVisible(addPoint);
    ui->actionAddName->setVisible(addName);
    ui->actionChangeItemName->setVisible(changeName);
    ui->actionDel->setVisible(del);
}

void MainWindow1::RemoveItem(QTreeWidgetItem *pItem)
{
    int nChildCount = pItem->childCount();
    if(nChildCount == 0)
    {
        delete pItem;
        pItem = nullptr;
        return ;
    }
    for(int i = 0; i < nChildCount; ++i)
    {
        QTreeWidgetItem *pTmp = pItem->child(0);
        RemoveItem(pTmp);
    }
    delete pItem;
    pItem = nullptr;
}