i have a class named display that creates a scene that is later added to a graphicsview
the display class has two slots, i want to move, hide , set text to items using the slots. the .h and .cpp for the display class is

as you can see i tried some move functions in the slots but the items do not move. what am i doing wrong?

Qt Code: 
  1. #ifndef DISPLAY_H #define DISPLAY_H
  2.  #include <QGraphicsView>
  3.  #include <QPushButton>
  4.  #include <QGraphicsRectItem>
  5.  #include <QGraphicsBlurEffect>
  6.     class display
  7.      : public QObject
  8.  {
  9.  Q_OBJECT
  10.  public:
  11.      display();
  13.      QPushButton *buttonExit;
  14.      QPushButton *buttonCalibrate;
  15.      QGraphicsRectItem *messagerect;
  16.      QString orientation;
  17.      QString anglestring;
  19.      QGraphicsRectItem *anglerect1;
  20.  public slots:
  21.      void setOrientation(QString neworientation);
  22.      void setAngles(double newanglexy,double newanglexz,double newangleyz);
  23.  private:
  24.      double anglexy ;
  25.      double anglexz ;
  26.      double angleyz ;
  27.  };
  28.   #endif // DISPLAY_H
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Qt Code: 
  1. #include "display.h" #include <QtGui/QApplication>
  2.  #include <QDebug>
  3.  #include <QDesktopWidget>
  4.    display::display()
  5.  {
  6.      anglexy = 0;
  7.      anglexz = 0;
  8.      angleyz = 0;
  9.      anglestring = "0";
  10.      const int screenwidth = QApplication::desktop()->width();
  11.      const int screenheight = QApplication::desktop()->height();
  12.      const int buttonheight = 60;
  13.      const int tubebackwidth = 300;
  14.      const int tubebackheight = 100;
  15.        qDebug() << "width: "+ QString::number(screenwidth) +" height: "+ QString::number(screenheight);
  16.       scene = new QGraphicsScene();
  17.      scene->setSceneRect(0,0,screenwidth,screenheight);
  18.      scene->setBackgroundBrush(Qt::black);
  19.      QGraphicsRectItem *tubeback = new QGraphicsRectItem(0, scene );
  20.      tubeback->setRect( screenwidth/2-tubebackwidth/2,screenheight/2-tubebackheight/2-buttonheight/2, tubebackwidth, tubebackheight );
  21.      //tubeback1->setFlag( QGraphicsItem::ItemIsMovable );
  22.      tubeback->setBrush(Qt::yellow);
  23.      tubeback->setGraphicsEffect(new QGraphicsBlurEffect());
  24.       QPen pen1;
  25.      pen1.setColor(Qt::black);
  26.      pen1.setWidth(10);
  27.      pen1.setStyle(Qt::DotLine);
  28.       QGraphicsEllipseItem *tubefront = new QGraphicsEllipseItem(0, scene );
  29.      tubefront->setRect( screenwidth/2-40,screenheight/2-tubebackheight/2-buttonheight/2+5, 80, tubebackheight-50 );
  30.       tubefront->setFlag( QGraphicsItem::ItemIsMovable );
  31.      tubefront->setBrush(Qt::white);
  32.      tubefront->setGraphicsEffect(new QGraphicsOpacityEffect());
  33.      tubefront->setGraphicsEffect(new QGraphicsBlurEffect());
  34.       QGraphicsLineItem *line1 = new QGraphicsLineItem(0,scene);
  35.      line1->setLine(screenwidth/2-tubebackwidth/6,screenheight/2-tubebackheight/2-buttonheight/2, screenwidth/2-tubebackwidth/6,screenheight/2-tubebackheight/2-buttonheight/2+tubebackheight);
  36.      line1->setPen(pen1);
  37.       QGraphicsLineItem *line2 = new QGraphicsLineItem(0,scene);
  38.      line2->setLine(screenwidth/2+tubebackwidth/6,screenheight/2-tubebackheight/2-buttonheight/2, screenwidth/2+tubebackwidth/6,screenheight/2-tubebackheight/2-buttonheight/2+tubebackheight);
  39.      line2->setPen(pen1);
  40.         //se intiaza un buton cu un apel calificat catre functia tr() pentru a traduce textul butonului
  41.      //: This name refers to the Calibrate Button's name
  42.      QPushButton *buttonCalibrate = new QPushButton(QObject::tr("Calibrate"));
  43.      #ifdef Q_WS_MAEMO
  44.      buttonCalibrate->setMaximumSize(screenwidth/2,buttonheight);
  45.      //#elif defined(Q_WS_MAEMO_5)
  46.      #else Q_OS_SYMBIAN
  47.      buttonCalibrate->setMaximumSize(screenwidth/2,buttonheight);
  48.      #endif
  49.      //: This name refers to the Exit Button's name
  50.      QPushButton *buttonExit = new QPushButton(QObject::tr("Exit"));
  51.      #ifdef Q_WS_MAEMO
  52.      buttonExit->setMaximumSize(screenwidth/2,buttonheight);
  53.      #else  Q_OS_SYMBIAN
  54.      buttonExit->setMaximumSize(screenwidth/2,buttonheight);
  55.      #endif
  56.      scene->addWidget(buttonCalibrate);
  57.      scene->addWidget(buttonExit);
  58.      buttonCalibrate->move(0,screenheight-buttonheight);
  59.      buttonExit->move(screenwidth/2,screenheight-buttonheight);
  60.           QGraphicsRectItem *messagerect= new QGraphicsRectItem(0, scene );
  61.          messagerect->setRect( 0,0, 280, 80 );
  62.          messagerect->setFlag( QGraphicsItem::ItemIsMovable );
  63.          messagerect->setBrush(Qt::black);
  64.          QGraphicsSimpleTextItem *messageitem = new QGraphicsSimpleTextItem (messagerect );
  65.          messageitem->setText(QObject::tr(" Keep the phone steady and level\n about to calibrate the phone \n for this orientation..."));
  66.          messageitem->setBrush(Qt::white);
  67.          messagerect->moveBy(screenwidth/2-140,screenheight/2-buttonheight/2-40);
  68.          messagerect->hide();
  69.           anglerect1= new QGraphicsRectItem(0 , scene );
  70.          anglerect1->setRect( 0,0, 30, 30 );
  71.          anglerect1->setFlag( QGraphicsItem::ItemIsMovable );
  72.          anglerect1->setBrush(Qt::black);
  73.          angleitem1 = new QGraphicsSimpleTextItem (anglerect1 );
  74.          angleitem1->setText("anglestring""");
  75.           angleitem1->setBrush(Qt::white);
  76.          anglerect1->moveBy(screenwidth/2-5,screenheight/2-buttonheight/2-100);
  77.         //anglerect1->hide();
  78.        //The connect() method connects a signal to the slot. When we click on the quit button, the clicked() signal is generated. The qApp is a global pointer to the application object. It is defined in the <QApplication> header file. The quit() method is called, when the clicked signal is emitted.
  79.      QObject::connect(buttonExit, SIGNAL(clicked()), qApp, SLOT(quit()));
  80.     }
  81.   void display::setOrientation(QString neworientation)
  82.  {
  83.      if (neworientation != orientation) {
  84.          orientation = neworientation;
  85.          qDebug() << "display orientation: " << orientation;
  86.       //  buttonCalibrate->move(0,0);
  87.  
  88.  }
  89.  }
  90.   void display::setAngles(double newanglexy,double newanglexz,double newangleyz)
  91.  {
  92.       if (newanglexy != anglexy) {
  93.          anglexy = newanglexy;
  94.           anglestring.sprintf("%.0f", anglexy);
  95.  
  96.          anglerect1->hide();
  97.         angleitem1->setText(anglestring);
  98.          qDebug() << "anglerecived "<<anglestring;
  99.      return anglerect1->hide();
  100.      return scene->update();
  101.  }
  102.  }
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