Moving items in a scene via slots

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?

Code:

---

#ifndef DISPLAY_H #define DISPLAY_H
 #include <QGraphicsView>
 #include <QPushButton>
 #include <QGraphicsRectItem>
 #include <QGraphicsBlurEffect>
    class display
     : public QObject
 {
 Q_OBJECT
 public:
     display();
      QGraphicsScene *scene;
     QPushButton *buttonExit;
     QPushButton *buttonCalibrate;
     QGraphicsRectItem *messagerect;
     QString orientation;
     QString anglestring;
      QGraphicsSimpleTextItem *angleitem1;
     QGraphicsRectItem *anglerect1;
 public slots:
     void setOrientation(QString neworientation);
     void setAngles(double newanglexy,double newanglexz,double newangleyz);
 private:
     double anglexy ;
     double anglexz ;
     double angleyz ;
 };
  #endif // DISPLAY_H

---

Code:

---

#include "display.h" #include <QtGui/QApplication>
 #include <QDebug>
 #include <QDesktopWidget>
   display::display()
 {
     anglexy = 0;
     anglexz = 0;
     angleyz = 0;
     anglestring = "0";
     const int screenwidth = QApplication::desktop()->width();
     const int screenheight = QApplication::desktop()->height();
     const int buttonheight = 60;
     const int tubebackwidth = 300;
     const int tubebackheight = 100;
       qDebug() << "width: "+ QString::number(screenwidth) +" height: "+ QString::number(screenheight);
      scene = new QGraphicsScene();
     scene->setSceneRect(0,0,screenwidth,screenheight);
     scene->setBackgroundBrush(Qt::black);
     QGraphicsRectItem *tubeback = new QGraphicsRectItem(0, scene );
     tubeback->setRect( screenwidth/2-tubebackwidth/2,screenheight/2-tubebackheight/2-buttonheight/2, tubebackwidth, tubebackheight );
     //tubeback1->setFlag( QGraphicsItem::ItemIsMovable );
     tubeback->setBrush(Qt::yellow);
     tubeback->setGraphicsEffect(new QGraphicsBlurEffect());
      QPen pen1;
     pen1.setColor(Qt::black);
     pen1.setWidth(10);
     pen1.setStyle(Qt::DotLine);
      QGraphicsEllipseItem *tubefront = new QGraphicsEllipseItem(0, scene );
     tubefront->setRect( screenwidth/2-40,screenheight/2-tubebackheight/2-buttonheight/2+5, 80, tubebackheight-50 );
      tubefront->setFlag( QGraphicsItem::ItemIsMovable );
     tubefront->setBrush(Qt::white);
     tubefront->setGraphicsEffect(new QGraphicsOpacityEffect());
     tubefront->setGraphicsEffect(new QGraphicsBlurEffect());
      QGraphicsLineItem *line1 = new QGraphicsLineItem(0,scene);
     line1->setLine(screenwidth/2-tubebackwidth/6,screenheight/2-tubebackheight/2-buttonheight/2, screenwidth/2-tubebackwidth/6,screenheight/2-tubebackheight/2-buttonheight/2+tubebackheight);
     line1->setPen(pen1);
      QGraphicsLineItem *line2 = new QGraphicsLineItem(0,scene);
     line2->setLine(screenwidth/2+tubebackwidth/6,screenheight/2-tubebackheight/2-buttonheight/2, screenwidth/2+tubebackwidth/6,screenheight/2-tubebackheight/2-buttonheight/2+tubebackheight);
     line2->setPen(pen1);
        //se intiaza un buton cu un apel calificat catre functia tr() pentru a traduce textul butonului
     //: This name refers to the Calibrate Button's name
     QPushButton *buttonCalibrate = new QPushButton(QObject::tr("Calibrate"));
     #ifdef Q_WS_MAEMO
     buttonCalibrate->setMaximumSize(screenwidth/2,buttonheight);
     //#elif defined(Q_WS_MAEMO_5)
     #else Q_OS_SYMBIAN
     buttonCalibrate->setMaximumSize(screenwidth/2,buttonheight);
     #endif
     //: This name refers to the Exit Button's name
     QPushButton *buttonExit = new QPushButton(QObject::tr("Exit"));
     #ifdef Q_WS_MAEMO
     buttonExit->setMaximumSize(screenwidth/2,buttonheight);
     #else  Q_OS_SYMBIAN
     buttonExit->setMaximumSize(screenwidth/2,buttonheight);
     #endif
     scene->addWidget(buttonCalibrate);
     scene->addWidget(buttonExit);
     buttonCalibrate->move(0,screenheight-buttonheight);
     buttonExit->move(screenwidth/2,screenheight-buttonheight);
          QGraphicsRectItem *messagerect= new QGraphicsRectItem(0, scene );
         messagerect->setRect( 0,0, 280, 80 );
         messagerect->setFlag( QGraphicsItem::ItemIsMovable );
         messagerect->setBrush(Qt::black);
         QGraphicsSimpleTextItem *messageitem = new QGraphicsSimpleTextItem (messagerect );
         messageitem->setText(QObject::tr(" Keep the phone steady and level\n about to calibrate the phone \n for this orientation..."));
         messageitem->setBrush(Qt::white);
         messagerect->moveBy(screenwidth/2-140,screenheight/2-buttonheight/2-40);
         messagerect->hide();
          anglerect1= new QGraphicsRectItem(0 , scene );
         anglerect1->setRect( 0,0, 30, 30 );
         anglerect1->setFlag( QGraphicsItem::ItemIsMovable );
         anglerect1->setBrush(Qt::black);
         angleitem1 = new QGraphicsSimpleTextItem (anglerect1 );
         angleitem1->setText("anglestring""");
          angleitem1->setBrush(Qt::white);
         anglerect1->moveBy(screenwidth/2-5,screenheight/2-buttonheight/2-100);
        //anglerect1->hide();
       //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.
     QObject::connect(buttonExit, SIGNAL(clicked()), qApp, SLOT(quit()));
    }
  void display::setOrientation(QString neworientation)
 {
     if (neworientation != orientation) {
         orientation = neworientation;
         qDebug() << "display orientation: " << orientation;
      //  buttonCalibrate->move(0,0);
 
 }
 }
  void display::setAngles(double newanglexy,double newanglexz,double newangleyz)
 {
      if (newanglexy != anglexy) {
         anglexy = newanglexy;
          anglestring.sprintf("%.0f", anglexy);
 
         anglerect1->hide();
        angleitem1->setText(anglestring);
         qDebug() << "anglerecived "<<anglestring;
     return anglerect1->hide();
     return scene->update();
 }
 }

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Hi.

I did not see you connecting this slots to any signal in the application.
You should create for example, two signals

signals:
void anglesChanged(double newanglexy,double newanglexz,double newangleyz)
void orientationChanged(QString neworientation)

and then:

connect(display, SIGNAL(anglesChanged(double,double,double)
this, SLOT(setAngles(double,double,double))))

connect(display, SIGNAL(orientationChanged(QString)
this, SLOT(setOrientationChanged(QString))));

You would probably emit your signals inside another slot connected to some ApplyChanges or something because I dont know where are you getting the values for the angles or the string for the orientation.

i did it eventualy. thanks