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!

Qt Code: 
  1. MainWindow::MainWindow()
  2.  {
  3. 	 desktopGeometry = QApplication::desktop()->availableGeometry(0);
  4.  
  5.      scrollArea = new QScrollArea;
  6.  
  7.      setCentralWidget(scrollArea);
  8.      QGroupBox *groupBox = new QGroupBox(scrollArea);
  9.          groupBox->setTitle(tr("Mobneu"));
  10.          QGridLayout *gridLayout = new QGridLayout(groupBox);
  11.          groupBox->setLayout(gridLayout);
  12.  
  13. 	// scrollArea->setBackgroundRole(QPalette::Dark);
  14.  
  15. 	 QDomDocument doc("test");
  16. 	   	 QFile file("test.xml");
  17. 	   	 if (!file.open(QIODevice::ReadOnly))
  18. 	   	     return ;
  19. 	   	 if (!doc.setContent(&file)) {
  20. 	   	     file.close();
  21. 	   	     return ;
  22. 	   	 }
  23. 	   	 file.close();
  24.  
  25.  
  26. 	   	 QDomElement docElem = doc.documentElement();
  27.  
  28. 	   	 QDomNode n = docElem.firstChild();
  29. 	   	//QString NodeName = q.nodeName();
  30. 	   	//QString NodeValue = q.nodeValue();
  31. 	   	 QLabel *label[20];
  32. 	  	QTextEdit *textEdit[20];
  33.  
  34. 	   	QLabel *labelData[20];
  35. 		 QString srcValue;
  36.  
  37.  
  38. 	 	int count=0;
  39.   	int count2=0;
  40.  
  41. array2=new QVector< QString>;
  42.   	int cont2=0;
  43. //attr[20]=new QString;
  44.  
  45. 	//    QVector< QVector<QString> *>vvStr;
  46. 	 //   QVector<QString> *vStr = new QVector<QString>;
  47. 	//    QVector<QString> *Temp = new QVector<QString>;
  48. 	//    QVector<QString> *Temp2 = new QVector<QString>;
  49.   	array.resize(20);
  50.   		for (int i = 0; i < 20; ++i)
  51.   		    array[i].resize(20);
  52.  
  53.  
  54.  
  55. 	 //  QVector<QString> *vect;
  56. 		int k=0;
  57. 	 int i=0;
  58. 	 int ciccio=0;
  59. 	 int cont=0;
  60.  
  61.  
  62. 	   	 while(!n.isNull()) {
  63. 	   		 cont=0;
  64. 	   	     QDomElement e = n.toElement(); // try to convert the node to an element.
  65. 	   	     if(!e.isNull()) {
  66.  
  67. 	   	   label[i]=new QLabel(groupBox);
  68. 	   	   label[i]->setText(qPrintable(e.tagName()));
  69. 	   	   set[i]=new QString;
  70. 	   	set[i]->append(qPrintable(e.tagName())).toCaseFolded();
  71.  
  72. 	   	   count++;
  73. 	   	       qDebug() << qPrintable(e.tagName()) ; // the node really is an element.
  74. 	   	     }
  75. 	   	   QDomNode p = n.firstChild();
  76.  
  77. 	   	 while(!p.isNull()) {
  78. cont++;
  79. 	   	 QDomElement e = p.toElement();
  80. 	   	labelData[k]=new QLabel;
  81. 	   	labelData[k]->setText(qPrintable(e.tagName()));
  82. 	   	param[k]=new QString;
  83. 	   	param2[k]=new QString;
  84. 	   	param[k]->append(qPrintable(e.tagName()));
  85. 	   	param2[k]->append(param[k]->toLower());
  86.  
  87. 	   	if(!e.isNull()) {
  88. 	   		count2++;
  89. 	   	  	       qDebug() << qPrintable(e.tagName()) ; // the node really is an element.
  90. 	   	  	     }
  91. 	   	QDomNode q = p.firstChild();
  92. 	   	cont2=0;
  93. 	   	 while(!q.isNull()) {
  94.  
  95. cont2++;
  96. 	   		 QDomElement e = q.toElement();
  97.  
  98. 	   	 	 srcValue=qPrintable( q.attributes().namedItem( "value" ).nodeValue());
  99.  
  100. 	   	 // wid->append(srcValue);
  101.  
  102. textEdit[ciccio]=new QTextEdit;
  103. textEdit[ciccio]->setMaximumSize(150,70);
  104. textEdit[ciccio]->append(srcValue);
  105.  
  106. QString qString2 = QString::fromUtf8(srcValue);
  107. attr[ciccio]=new QString;
  108. attr[ciccio]->append(qString2);
  109.  
  110.  
  111. 	   	  	if(!e.isNull()) {
  112.  
  113. 	   	  		array2->insert(ciccio,srcValue);
  114.  
  115. 	   	  	array[k][ciccio]=srcValue;
  116. //vStr->append(srcValue);
  117.  
  118.  
  119.  
  120. 	   	  	  	    //   qDebug() << srcValue ; // the node really is an element.
  121. 	   	 // 	  	       qDebug()<<vStr->at(k);
  122.  
  123. 	   	  	  	     }
  124.  
  125. 	   //	 qDebug() << k ;
  126.  
  127. ciccio++;
  128.  
  129.  
  130. 	   		q=q.nextSibling();
  131.  
  132.  
  133.  
  134. 	   	 }
  135.  
  136. 	   	// qDebug() << vStr->at(k);
  137.  
  138. 	 	//qDebug() << count;
  139.  
  140. 	   	p = p.nextSibling();
  141.  
  142.  
  143.  
  144. 	 	qDebug() << cont2;
  145. 	 	conteggio2[k]=cont2;
  146. 	 	   		k++;
  147.  
  148. 	   	 }
  149.  
  150. 	   	 conteggio[i]=cont;
  151. 	   	 i++;
  152. parametr=i;
  153. 		//qDebug()<< i;
  154. 	   	n = n.nextSibling();
  155. 	//   	count=0;
  156. 	   	 }
  157. 	  // 	qDebug()<<vStr->count();
  158. 	   //	qDebug()<<vvStr.count();
  159.  
  160. 	   //	qDebug()<<Temp2->at(0);
  161. 		//qDebug()<<Temp->at(1);
  162. 	//	qDebug()<<Temp2->at(1);
  163. 	 //	  QVBoxLayout *lay=new QVBoxLayout(scrollArea);
  164.  
  165.  
  166. qDebug()<<conteggio2[0];
  167. qDebug()<<conteggio2[1];
  168. qDebug()<<conteggio2[2];
  169.  
  170. 	   	 int h=0;
  171. 	   	 int f=0;
  172. 	   	 int u=0;
  173. 	   	 int o=0;
  174. 	   	 int p=0;
  175.  
  176.  
  177. 	  	  for (int i = 0;i <parametr; i++) {
  178. 	  		  if(o!=0){
  179. 	  			  o=o+1;
  180. 	  		  }
  181. 	  		gridLayout->addWidget(label[i],i+h,0);
  182. 	  		 for ( int j=0 ;j <conteggio[i]; j++){
  183.  
  184. 	 	gridLayout->addWidget(labelData[h],f+1,1);
  185. 	 		h++;
  186. 	 		f++;
  187.  
  188. 	 for(int s=0;s<conteggio2[p];s++){
  189.  
  190. 		 gridLayout->addWidget(textEdit[u],o+1,s+2);
  191. 		 u++;
  192.  
  193.  
  194. 	 }
  195. 	 o++;
  196. //u=0;
  197. //u=u+conteggio2[j];
  198. p++;
  199. 	  		 }
  200.  
  201. 	  	//	 h=0;
  202.  
  203. 	  //		h=h+conteggio[i];
  204. 	  		f=f+1;
  205. 	  		//gridLayout->addWidget(textEdit[i][j],j+1,2);
  206.  
  207. 	  		  //lay.addWidget(ses,i,0);
  208.  
  209.  
  210. 	  	  }
  211.  
  212.  
  213.  
  214.  
  215.  
  216. 	  	  for(int i=0;i<count;i++)
  217. qDebug()<<set[i]->toCaseFolded();
  218. 	  	  for(int i=0;i<count2;i++)
  219. qDebug()<<param[i]->toLower();
  220.  
  221. 	  	for(int i=0;i<3;i++){
  222. 	  		for(int j=0;j<5;j++){
  223. 	  			qDebug()<<array[i][j];
  224. 	  		}
  225.  
  226. 	  	}
  227. 	  	  for(int i=0;i<2;i++)
  228. qDebug()<<conteggio[i];
  229. 	  	qDebug()<<conteggio2[2];
  230.  
  231. 	  	for(int i=0;i<2;i++)
  232. 	  		qDebug()<<param2[i];
  233.  
  234. /*
  235. 	  	  nlayLabel = new QLabel(tr("NLAYER ="));
  236. 	  	         numnoLabel = new QLabel(tr("NUMNODI ="));
  237. 	  	        dlayLabel = new QLabel(tr("DISPLAYER ="));
  238. 	  	         	  domainLabel = new QLabel(tr("DOMAIN ="));
  239. 	  	             etaeLabel = new QLabel(tr("ETAERR ="));
  240. 	  	            etathLabel = new QLabel(tr("ETATHETA ="));
  241. 	  	           etaLabel1 = new QLabel(tr("ETA1 ="));
  242. 	  	             etaLabel2 = new QLabel(tr("ETA2 ="));
  243. 	  	             etaLabel3 = new QLabel(tr("ETA3 ="));
  244. */
  245. 	  	//           gridLayout->addWidget(nlayLabel,3,0);
  246. 	  //	        gridLayout->addWidget(numnoLabel,4,0);
  247. 	//  	       gridLayout->addWidget(dlayLabel,5,0);
  248.  
  249. 	  	     if (desktopGeometry.height() < 400){
  250. 	  	            gridLayout->setVerticalSpacing(80);
  251. 	  	    }
  252. 	  	        else{
  253. 	  	            gridLayout->setVerticalSpacing(10); //150
  254. 	  	   }
  255.  
  256. //	  	   gridLayout->addWidget(label);
  257. 	//  	      gridLayout->addWidget(lineEdit);
  258. 	  //	      gridLayout->addWidget(button);
  259.  
  260. 	  	      scrollArea->setWidget(groupBox);
  261. 	  	      scrollArea->setGeometry(20,30,700,600);
  262. 	  	      QHBoxLayout* layout = new QHBoxLayout();
  263. 	  	      layout->addWidget(scrollArea,2,0);
  264. 	  	   //   setLayout(layout);
  265. 	  	  scrollArea->setHorizontalScrollBarPolicy(Qt::ScrollBarAsNeeded);
  266. 	  	 scrollArea->setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
  267.  
  268.  
  269. 	  	     //scrollArea->setWidgetResizable(true);
  270.  
  271.  
  272. 	  	     connect(QApplication::desktop(), SIGNAL(workAreaResized(int)),
  273. 	  	         this, SLOT(desktopResized(int)));
  274.  
  275. 	  //	lay->addWidget(scrollArea);
  276. 	  //	setLayout(lay);
  277.  
  278. 	 	setStyleSheet("QAbstractScrollArea { margin: 20px; }");
  279.      createActions();
  280.      createMenus();
  281.  
  282.  
  283.  
  284.      setWindowTitle(tr("XML file"));
  285.      resize(800, 800);
  286.  
  287.  }
  288.  
  289.  void MainWindow::desktopResized(int screen)
  290.  {
  291.      if (screen != 0)
  292.          return;
  293.      reactToSIP();
  294.  }
  295.  
  296.  void MainWindow::reactToSIP()
  297.  {
  298.      QRect availableGeometry = QApplication::desktop()->availableGeometry(0);
  299.  
  300.      if (desktopGeometry != availableGeometry) {
  301.          if (windowState() | Qt::WindowMaximized)
  302.              setWindowState(windowState() & ~Qt::WindowMaximized);
  303.  
  304.  
  305.  
  306.          setGeometry(availableGeometry);
  307.      }
  308.  
  309.      desktopGeometry = availableGeometry;
  310.  }
  311.  
  312.  void MainWindow::open()
  313.  {
  314.      QString fileName =
  315.              QFileDialog::getOpenFileName(this, tr("Open xml File"),
  316.                                           QDir::currentPath(),
  317.                                           tr("XML Files (*.xml)"));
  318.      if (fileName.isEmpty())
  319.          return;
  320.  
  321.      QFile file(fileName);
  322.      if (!file.open(QFile::ReadOnly | QFile::Text)) {
  323.     	          QMessageBox::warning(this, tr("xml"), tr("Cannot read file %1:\n%2.")
  324.                               .arg(fileName)
  325.                               .arg(file.errorString()));
  326.          return;
  327.      }
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