Update QScrollArea after open files

Hello! I need help ....
In my program worked well, I parsed the xml file and I created the label and edit text in a ScrollArea. But I do not know how to open a file and update my ScrollArea with the new label and textedit. How do I do this??

This is the code. Cpp thanks!
Code:
MainWindow::MainWindow()
 {
	 desktopGeometry = QApplication::desktop()->availableGeometry(0);
 
     scrollArea = new QScrollArea;
 
     setCentralWidget(scrollArea);
     QGroupBox *groupBox = new QGroupBox(scrollArea);
         groupBox->setTitle(tr("Mobneu"));
         QGridLayout *gridLayout = new QGridLayout(groupBox);
         groupBox->setLayout(gridLayout);
 
	// scrollArea->setBackgroundRole(QPalette::Dark);
 
	 QDomDocument doc("test");
	   	 QFile file("test.xml");
	   	 if (!file.open(QIODevice::ReadOnly))
	   	     return ;
	   	 if (!doc.setContent(&file)) {
	   	     file.close();
	   	     return ;
	   	 }
	   	 file.close();
 
 
	   	 QDomElement docElem = doc.documentElement();
 
	   	 QDomNode n = docElem.firstChild();
	   	//QString NodeName = q.nodeName();
	   	//QString NodeValue = q.nodeValue();
	   	 QLabel *label[20];
	  	QTextEdit *textEdit[20];
 
	   	QLabel *labelData[20];
		 QString srcValue;
 
 
	 	int count=0;
  	int count2=0;
 
array2=new QVector< QString>;
  	int cont2=0;
//attr[20]=new QString;
 
	//    QVector< QVector<QString> *>vvStr;
	 //   QVector<QString> *vStr = new QVector<QString>;
	//    QVector<QString> *Temp = new QVector<QString>;
	//    QVector<QString> *Temp2 = new QVector<QString>;
  	array.resize(20);
  		for (int i = 0; i < 20; ++i)
  		    array[i].resize(20);
 
 
 
	 //  QVector<QString> *vect;
		int k=0;
	 int i=0;
	 int ciccio=0;
	 int cont=0;
 
 
	   	 while(!n.isNull()) {
	   		 cont=0;
	   	     QDomElement e = n.toElement(); // try to convert the node to an element.
	   	     if(!e.isNull()) {
 
	   	   label[i]=new QLabel(groupBox);
	   	   label[i]->setText(qPrintable(e.tagName()));
	   	   set[i]=new QString;
	   	set[i]->append(qPrintable(e.tagName())).toCaseFolded();
 
	   	   count++;
	   	       qDebug() << qPrintable(e.tagName()) ; // the node really is an element.
	   	     }
	   	   QDomNode p = n.firstChild();
 
	   	 while(!p.isNull()) {
cont++;
	   	 QDomElement e = p.toElement();
	   	labelData[k]=new QLabel;
	   	labelData[k]->setText(qPrintable(e.tagName()));
	   	param[k]=new QString;
	   	param2[k]=new QString;
	   	param[k]->append(qPrintable(e.tagName()));
	   	param2[k]->append(param[k]->toLower());
 
	   	if(!e.isNull()) {
	   		count2++;
	   	  	       qDebug() << qPrintable(e.tagName()) ; // the node really is an element.
	   	  	     }
	   	QDomNode q = p.firstChild();
	   	cont2=0;
	   	 while(!q.isNull()) {
 
cont2++;
	   		 QDomElement e = q.toElement();
 
	   	 	 srcValue=qPrintable( q.attributes().namedItem( "value" ).nodeValue());
 
	   	 // wid->append(srcValue);
 
textEdit[ciccio]=new QTextEdit;
textEdit[ciccio]->setMaximumSize(150,70);
textEdit[ciccio]->append(srcValue);
 
QString qString2 = QString::fromUtf8(srcValue);
attr[ciccio]=new QString;
attr[ciccio]->append(qString2);
 
 
	   	  	if(!e.isNull()) {
 
	   	  		array2->insert(ciccio,srcValue);
 
	   	  	array[k][ciccio]=srcValue;
//vStr->append(srcValue);
 
 
 
	   	  	  	    //   qDebug() << srcValue ; // the node really is an element.
	   	 // 	  	       qDebug()<<vStr->at(k);
 
	   	  	  	     }
 
	   //	 qDebug() << k ;
 
ciccio++;
 
 
	   		q=q.nextSibling();
 
 
 
	   	 }
 
	   	// qDebug() << vStr->at(k);
 
	 	//qDebug() << count;
 
	   	p = p.nextSibling();
 
 
 
	 	qDebug() << cont2;
	 	conteggio2[k]=cont2;
	 	   		k++;
 
	   	 }
 
	   	 conteggio[i]=cont;
	   	 i++;
parametr=i;
		//qDebug()<< i;
	   	n = n.nextSibling();
	//   	count=0;
	   	 }
	  // 	qDebug()<<vStr->count();
	   //	qDebug()<<vvStr.count();
 
	   //	qDebug()<<Temp2->at(0);
		//qDebug()<<Temp->at(1);
	//	qDebug()<<Temp2->at(1);
	 //	  QVBoxLayout *lay=new QVBoxLayout(scrollArea);
 
 
qDebug()<<conteggio2[0];
qDebug()<<conteggio2[1];
qDebug()<<conteggio2[2];
 
	   	 int h=0;
	   	 int f=0;
	   	 int u=0;
	   	 int o=0;
	   	 int p=0;
 
 
	  	  for (int i = 0;i <parametr; i++) {
	  		  if(o!=0){
	  			  o=o+1;
	  		  }
	  		gridLayout->addWidget(label[i],i+h,0);
	  		 for ( int j=0 ;j <conteggio[i]; j++){
 
	 	gridLayout->addWidget(labelData[h],f+1,1);
	 		h++;
	 		f++;
 
	 for(int s=0;s<conteggio2[p];s++){
 
		 gridLayout->addWidget(textEdit[u],o+1,s+2);
		 u++;
 
 
	 }
	 o++;
//u=0;
//u=u+conteggio2[j];
p++;
	  		 }
 
	  	//	 h=0;
 
	  //		h=h+conteggio[i];
	  		f=f+1;
	  		//gridLayout->addWidget(textEdit[i][j],j+1,2);
 
	  		  //lay.addWidget(ses,i,0);
 
 
	  	  }
 
 
 
 
 
	  	  for(int i=0;i<count;i++)
qDebug()<<set[i]->toCaseFolded();
	  	  for(int i=0;i<count2;i++)
qDebug()<<param[i]->toLower();
 
	  	for(int i=0;i<3;i++){
	  		for(int j=0;j<5;j++){
	  			qDebug()<<array[i][j];
	  		}
 
	  	}
	  	  for(int i=0;i<2;i++)
qDebug()<<conteggio[i];
	  	qDebug()<<conteggio2[2];
 
	  	for(int i=0;i<2;i++)
	  		qDebug()<<param2[i];
 
/*
	  	  nlayLabel = new QLabel(tr("NLAYER ="));
	  	         numnoLabel = new QLabel(tr("NUMNODI ="));
	  	        dlayLabel = new QLabel(tr("DISPLAYER ="));
	  	         	  domainLabel = new QLabel(tr("DOMAIN ="));
	  	             etaeLabel = new QLabel(tr("ETAERR ="));
	  	            etathLabel = new QLabel(tr("ETATHETA ="));
	  	           etaLabel1 = new QLabel(tr("ETA1 ="));
	  	             etaLabel2 = new QLabel(tr("ETA2 ="));
	  	             etaLabel3 = new QLabel(tr("ETA3 ="));
*/
	  	//           gridLayout->addWidget(nlayLabel,3,0);
	  //	        gridLayout->addWidget(numnoLabel,4,0);
	//  	       gridLayout->addWidget(dlayLabel,5,0);
 
	  	     if (desktopGeometry.height() < 400){
	  	            gridLayout->setVerticalSpacing(80);
	  	    }
	  	        else{
	  	            gridLayout->setVerticalSpacing(10); //150
	  	   }
 
//	  	   gridLayout->addWidget(label);
	//  	      gridLayout->addWidget(lineEdit);
	  //	      gridLayout->addWidget(button);
 
	  	      scrollArea->setWidget(groupBox);
	  	      scrollArea->setGeometry(20,30,700,600);
	  	      QHBoxLayout* layout = new QHBoxLayout();
	  	      layout->addWidget(scrollArea,2,0);
	  	   //   setLayout(layout);
	  	  scrollArea->setHorizontalScrollBarPolicy(Qt::ScrollBarAsNeeded);
	  	 scrollArea->setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 
 
	  	     //scrollArea->setWidgetResizable(true);
 
 
	  	     connect(QApplication::desktop(), SIGNAL(workAreaResized(int)),
	  	         this, SLOT(desktopResized(int)));
 
	  //	lay->addWidget(scrollArea);
	  //	setLayout(lay);
 
	 	setStyleSheet("QAbstractScrollArea { margin: 20px; }");
     createActions();
     createMenus();
 
 
 
     setWindowTitle(tr("XML file"));
     resize(800, 800);
 
 }
 
 void MainWindow::desktopResized(int screen)
 {
     if (screen != 0)
         return;
     reactToSIP();
 }
 
 void MainWindow::reactToSIP()
 {
     QRect availableGeometry = QApplication::desktop()->availableGeometry(0);
 
     if (desktopGeometry != availableGeometry) {
         if (windowState() | Qt::WindowMaximized)
             setWindowState(windowState() & ~Qt::WindowMaximized);
 
 
 
         setGeometry(availableGeometry);
     }
 
     desktopGeometry = availableGeometry;
 }
 
 void MainWindow::open()
 {
     QString fileName =
             QFileDialog::getOpenFileName(this, tr("Open xml File"),
                                          QDir::currentPath(),
                                          tr("XML Files (*.xml)"));
     if (fileName.isEmpty())
         return;
 
     QFile file(fileName);
     if (!file.open(QFile::ReadOnly | QFile::Text)) {
    	          QMessageBox::warning(this, tr("xml"), tr("Cannot read file %1:\n%2.")
                              .arg(fileName)
                              .arg(file.errorString()));
         return;
     }