When using a Tree Widget how do I Reinsert what I want the tree to display

[AI_Messiah]

So what I have is a Tree Widget I am using it for some classes where their contents will change. I don't want to add the results of a change to what I already have displayed.

this is what I am doing.

void Dialog::addRoot(QString name, QString desc)
{
    QTreeWidgetItem *itm = new QTreeWidgetItem(ui->treeWidget);
    itm->setText(0, name);
    itm->setText(1, desc);
    ui->treeWidget->addTopLevelItem(itm);
    node aprt;
    DefString chpar;
    for (int i=0;i<par.subNodes1.size();i++){
        aprt = par.subNodes1[i];
        chpar.convert(aprt);
        addChild(chpar, itm);
    }
    for (int i=0;i<par.subNodes2.size();i++){
        aprt = par.subNodes2[i];
        chpar.convert(aprt);
        addChild(chpar, itm);
    }

}

void Dialog::addChild(DefString defs, QTreeWidgetItem *parent)
{
    QTreeWidgetItem *itm = new QTreeWidgetItem();
    itm->setText(0, defs.getFirst());
    itm->setText(1, defs.getSecond());
    parent->addChild(itm);
    node aprt;
    DefString chpar;
    for (int i=0;i<defs.subNodes1.size();i++){
        aprt = defs.subNodes1[i];
        chpar.convert(aprt);
        addChild(chpar, itm);
    }
    for (int i=0;i<defs.subNodes2.size();i++){
        aprt = defs.subNodes2[i];
        chpar.convert(aprt);
        addChild(chpar, itm);
    }
}

void Dialog::on_btn_run_clicked()
{

    
    lstruct.update();
    ui->lbl_lnum->setText(QString::number(lstruct.curline));
    ui->lbl_ltext->setText(lstruct.lines.at(lstruct.curline));
    tree1->clear();
    node anod = lstruct.curexam;
    par1.convert(anod);
    QTreeWidgetItem *itm = new QTreeWidgetItem(ui->treeWidget);
    itm->setText(0, par1.getFirst());
    itm->setText(1, par1.getSecond());
    tree1->addTopLevelItem(itm);
    label->setText(QString::number(lstruct.curlev));


    anod = lstruct.tree;
    par.convert(anod);
    addRoot(par.getFirst(), par.getSecond());
}


void Dialog::on_btn_make_clicked()
{
    ui->treeWidget->clear();
    QString apic;
    QString line;
    QString script = ui->textEdit->toPlainText() + "\n";
    for (int i=0;i < script.length();i++){
        apic = script.mid(i, 1);
        if (apic == "\n"){
            lstruct.takeLine(line);
            line = "";
        }else{
            line += apic;
        }
    }
    lstruct.curline = 0;
    node snod = lstruct.tree;
    par.convert(snod);
    addRoot(par.getFirst(), par.getSecond());
}


void DefString::convert(node anod)
{
    isWhile = anod.isWhile;
    start = anod.start;
    middle = anod.middle;
    end = anod.end;
    curnode1 = anod.curnode1;
    curnode2 = anod.curnode2;
    seclist = anod.seclist;
    goback = anod.goback;
    braover = anod.braover;
    firinc = anod.firinc;
    subNodes1 = anod.subNodes1;
    subNodes2 = anod.subNodes2;
}

QString DefString::getFirst()
{
    return "While\nStart\nMiddle\nEnd\nCurrent1\nCurrent2\nSecond\nGoBack\nBranch\nFirInc";
}

QString DefString::getSecond()
{
    QString ret;
    if (isWhile){
        ret = "True\n";
    }else{
        ret = "False\n";
    }
    ret += QString::number(start) + "\n";
    ret += QString::number(middle) + "\n";
    ret += QString::number(end) + "\n";
    ret += QString::number(curnode1) + "\n";
    ret += QString::number(curnode2) + "\n";
    if (seclist){
        ret += "True\n";
    }else{
        ret += "False\n";
    }
    if (goback){
        ret += "True\n";
    }else{
        ret += "False\n";
    }
    if (braover){
        ret += "True\n";
    }else{
        ret += "False\n";
    }
    if (firinc){
        ret += "True\n";
    }else{
        ret += "False\n";
    }
    return ret;
}

[JonB]

@AI_Messiah
There is a fair amount of code here, probably most of it not relevant. I do not understand what you are actually asking? What does it do/not do that is not what you want? Which bit of it is at issue?

[AI_Messiah]

I would like to be able to erase the tree and insert the values again.

[Christian Ehrlicher]

@AI_Messiah said in When using a Tree Widget how do I Reinsert what I want the tree to display:

I would like to be able to erase the tree and insert the values again.

You have to delete all top level QTreeWidgetItems.

[AI_Messiah]

I forgot to use the clear() method.