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#ifndef MAINWINDOW_H
#define MAINWINDOW_H
 
#include <QMainWindow>
#include <QGraphicsScene>
 
namespace Ui {
class MainWindow;
}
 
class Param
{
public:
    QString name;
    QString value;
};
 
class MainWindow : public QMainWindow
{
    Q_OBJECT
 
public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
 
    void readFile(QString fileName);
    void createShape(QGraphicsItem *&target, QString name, QList<Param> list);
 
private:
    Ui::MainWindow *ui;
    QGraphicsScene * scene;
};
 
#endif // MAINWINDOW_H

#include “mainwindow.h” #include “ui_mainwindow.h”

#include <QFile> #include <QXmlStreamReader> #include <QXmlStreamAttribute>

#include <QGraphicsRectItem> #include <QGraphicsEllipseItem>

MainWindow::MainWindow(QWidget *parent) :

  QMainWindow(parent),
  ui(new Ui::MainWindow)

{

  ui->setupUi(this);

  scene = new QGraphicsScene;
  ui->graphicsView->setScene (scene);

  scene->addLine (0, 0, 100, 100, QColor ("blue"));

  // readFile ("../xml/mainwindow.ui");
  readFile ("../xml/data.xml");

}

MainWindow::~MainWindow() {

  delete ui;

}

void MainWindow::readFile (QString fileName) {

  QFile file (fileName);
  if (file.open (QFile::ReadOnly | QFile::Text ))
  {
      QTreeWidgetItem * branch = ui->treeWidget->invisibleRootItem();
      QGraphicsItem * target = NULL;
      QXmlStreamReader reader (&file);
      while (! reader.atEnd())
      {
          if (reader.isStartElement())
          {
              QString s = reader.name().toString();
              QTreeWidgetItem * item = new QTreeWidgetItem;
              item->setText (0, s);
              item->setForeground (0, QColor ("blue"));
              branch->addChild (item);
              branch = item;

              QList <Param> list;
              // for (QXmlStreamAttribute a : reader.attributes())
              for (auto a : reader.attributes())
              {
                 auto node = new QTreeWidgetItem;
                 QString t = a.name().toString() + "=" + a.value().toString();
                 node->setText (0, t);
                 node->setForeground (0, QColor ("green"));
                 item->addChild (node);

                 Param p;
                 p.name = a.name().toString();
                 p.value = a.value().toString();
                 list.append (p);
                 /* list << p; */
              }

              createShape (target, s, list);
          }
          else if (reader.isCharacters())
          {
              QString s = reader.text().toString().simplified();
              if (s != "")
              {
                 QTreeWidgetItem * item = new QTreeWidgetItem;
                 item->setText (0, s);
                 item->setForeground (0, QColor ("orange"));
                 branch->addChild (item);
              }
          }
          else if (reader.isEndElement())
          {
              branch = branch->parent();
          }
          reader.readNext();
      }
      ui->treeWidget->expandAll();
  }

}

void MainWindow::createShape (QGraphicsItem * & target,

                            QString name,
                            QList <Param> list)

{

  QGraphicsRectItem * shape = NULL;
  if (name == "rectangle")
      shape = new QGraphicsRectItem;
  else if (name == "ellipse")
      shape = new QGraphicsRectItem;

  if (shape != NULL)
  {
      shape->setRect(10, 10, 100, 40);
      shape->setFlag (QGraphicsItem::ItemIsMovable);

      for (Param p : list)
          if (p.name == "pen")
              shape->setPen (QColor (p.value));
          else if (p.name == "brush")
              shape->setBrush (QColor (p.value));

      if (target == NULL)
          scene->addItem (shape);
      else
          shape->setParentItem (target);
  }

} </code>