向TreeWidget中添加根/子节点，删除节点，修改节点

朴灿烈づ我的快乐病毒、 2022-05-10 15:06 226阅读 0赞

拖一个TreeWidget 控件 改名 tv\_Source

拖拉四个Button 按钮 分别取名btn\_AddRoot，  btn\_Add，  btn\_Del，   btn\_Modify

![70][]

给四个按钮添加槽函数（clicked）

widget.h

#ifndef WIDGET_H
    #define WIDGET_H
    
    #include <QWidget>
    #include <QDialog>
    #include <QString>
    #include <QTreeWidgetItem>
    
    
    namespace Ui {
    class Widget;
    }
    
    class Widget : public QWidget
    {
        Q_OBJECT
        
    public:
        explicit Widget(QWidget *parent = 0);
        ~Widget();
    
    public slots:
        void on_tv_Source_currentItemChanged(QTreeWidgetItem *current, QTreeWidgetItem *previous);
        void on_btn_Add_clicked();
        void on_btn_Modify_clicked();
        void on_btn_Del_clicked();
        void on_btn_AddRoot_clicked();
    
    
    private:
        Ui::Widget *ui;
        QTreeWidgetItem * AddTreeRoot(QString name,QString desc);
        QTreeWidgetItem * AddTreeNode(QTreeWidgetItem *parent,QString name,QString desc);
    };
    
    #endif // WIDGET_H

widget.cpp

#include "widget.h"
    #include "ui_widget.h"
    #include <QStringList>
    
    
    Widget::Widget(QWidget *parent) :
        QWidget(parent),
        ui(new Ui::Widget)
    {
        ui->setupUi(this);
        ui->tv_Source->setColumnCount(2);
        ui->tv_Source->setHeaderLabels(QStringList()<<"Name"<<"Description");
        //ui->tv_Source->setHeaderHidden(true);
        QTreeWidgetItem * beiJingItem = AddTreeRoot("bejing","city");
        AddTreeNode(beiJingItem,"haidian","HaiDian");
        AddTreeNode(beiJingItem,"chaoYang","chaoYang");
        AddTreeNode(beiJingItem,"fengTai","fengTai");
        QTreeWidgetItem * HeiBeiItem =AddTreeRoot("hebei","city");
        AddTreeNode(HeiBeiItem,"baoDing","baoDing");
        AddTreeNode(HeiBeiItem,"shiJiaZhuang","shiJiaZhuang");
    }
    
    Widget::~Widget()
    {
        delete ui;
    }
    QTreeWidgetItem * Widget::AddTreeRoot(QString name,QString desc)
    {
        QTreeWidgetItem * item=new QTreeWidgetItem(QStringList()<<name<<desc);
        ui->tv_Source->addTopLevelItem(item);
        return item;
    }
    
    QTreeWidgetItem * Widget::AddTreeNode(QTreeWidgetItem *parent,QString name,QString desc)
    {
        QTreeWidgetItem * item=new QTreeWidgetItem(QStringList()<<name<<desc);
        parent->addChild(item);
        return item;
    }
    
    void Widget::on_tv_Source_currentItemChanged(QTreeWidgetItem *current, QTreeWidgetItem *previous)
    {
        if(current==NULL)
            return;
        if(previous!=NULL)
        {
            previous->setBackground(0,Qt::transparent);
            previous->setBackground(1,Qt::transparent);
            previous->setTextColor(0,Qt::black);
            previous->setTextColor(1,Qt::black);
        }
        current->setTextColor(0,Qt::blue);
        current->setTextColor(1,Qt::blue);
        current->setBackground(0,Qt::red);
        current->setBackground(1,Qt::red);
    }
    
    //添加
    void Widget::on_btn_Add_clicked()
    {
        QTreeWidgetItem * item= ui->tv_Source->currentItem();
        if(item!=NULL)
        {
            AddTreeNode(item,"new","new");
        }
        else
        {
            AddTreeRoot("new","new");
        }
    }
    
    
    //修改
    void Widget::on_btn_Modify_clicked()
    {
        QTreeWidgetItem * currentItem = ui->tv_Source->currentItem();
    
        if(currentItem==NULL)
        {
            return;
        }
        for(int i=0;i<currentItem->columnCount();i++)
        {
            currentItem->setText(i,tr("Modify")+QString::number(i));
        }
    }
    
    //删除
    void Widget::on_btn_Del_clicked()
    {
        QTreeWidgetItem * currentItem = ui->tv_Source->currentItem();
    
        if(currentItem==NULL)
        {
            return;
        }
        //如果没有父节点就直接删除
        if(currentItem->parent()==NULL)
        {
            delete ui->tv_Source->takeTopLevelItem(ui->tv_Source->currentIndex().row());
        }
        else
        {
            //如果有父节点就要用父节点的takeChild删除节点
            delete currentItem->parent()->takeChild(ui->tv_Source->currentIndex().row());
        }
    }
    
    void Widget::on_btn_AddRoot_clicked()
    {
         AddTreeRoot("new","new");
    }

实现效果：

![70 1][]

源码下载地址：[https://download.csdn.net/download/weixin\_40569991/10730744][https_download.csdn.net_download_weixin_40569991_10730744]

参考：[https://www.cnblogs.com/li-peng/p/3652287.html][https_www.cnblogs.com_li-peng_p_3652287.html]

[70]: /images/20220505/cdfcf286c01740628fb07a2dd56e18b8.png
[70 1]: /images/20220505/cd3a956bdb2341cc89dd1bd25c4cfa34.png
[https_download.csdn.net_download_weixin_40569991_10730744]: https://download.csdn.net/download/weixin_40569991/10730744
[https_www.cnblogs.com_li-peng_p_3652287.html]: https://www.cnblogs.com/li-peng/p/3652287.html