Hi,

I need to write an application that helps me to interchange the behaviour of the keys,
i.e I need to swap the functionality of the both up arrow and down arrow keys that are present in the keyboard and i am trying to do it using the QKeyEvent.
Is it possible to do so,here is my code please go through it and suggest me where i have done wrong

Here is My HeaderFile
Qt Code: 
  1. #ifndef WIDGET_H
  2. #define WIDGET_H
  3.  
  4. #include <QtWidgets>
  5. #include <QEvent>
  6. #include<QTextEdit>
  7. #include<QMessageBox>
  8. class Widget : public QWidget
  9. {
  10.     Q_OBJECT
  11.  
  12. public:
  13.  
  14.     Widget(QWidget *parent = 0);
  15. //   QMessageBox box; 
  16.   // QLabel *txt;
  17.     ~Widget();
  18. protected:
  19.     bool event(QEvent *);
  20. };
  21.  
  22. #endif // WIDGET_H
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Here is My ".cpp" File

Qt Code: 
  1. #include "widget.h"
  2. #include <QDebug>
  3. #include <QKeyEvent>
  4. #include<QTextEdit>
  5. #include<QString>
  6. #include<QMessageBox>
  7.  QString str,str1,str2;
  8. Widget::Widget(QWidget *parent)
  9.     : QWidget(parent)
  10. {
  11.         qDebug() << "Constructor";
  12.  
  13.         //txt= new QLabel(this);
  14.         //txt->setGeometry(0,0,320,240);
  15. }
  16.  
  17. Widget::~Widget()
  18. {
  19.         qDebug() << "Destructor";
  20. }
  21.  
  22. bool Widget::event(QEvent *e){
  23.         //int ret;
  24.  
  25. //      qDebug()<<"line num is"<<__LINE__;
  26.  
  27.         if(e->type()==QEvent::KeyRelease){
  28.                 QKeyEvent *ke = static_cast<QKeyEvent *>(e);
  29.                 int keyValR = ke->key();
  30.                  qDebug() << "Released key value is : " << keyValR;
  31.  
  32.                  /*  QString str = QString::number(keyValR);
  33.                    qDebug()<<str;*/
  34.                 switch (keyValR) {
  35.                         case Qt::Key_F1 :
  36.                                 //qDebug()<<__LINE__;
  37.                                 qDebug() << "You have PRESSED ::  F1";
  38.                                  //qDebug() << "You have PRESSED ::  F1";
  39.                                 QMessageBox::information(this,"key pressed", "You have PRESSED ::  <b><font color = red>F1</font></b>");
  40.                                 break;
  41.                                 //case 16777265:
  42.                         case Qt::Key_F2 :
  43.                                 qDebug() << "You have PRESSED ::  F2";
  44.                                 QMessageBox::information(this,"key pressed", "You have PRESSED ::  <b><font color = red>F2</font></b>");
  45.                                 break;
  46.                         case Qt::Key_F3 :
  47.                                 qDebug() << "You have PRESSED ::  F3";
  48.                                 QMessageBox::information(this,"key pressed", "You have PRESSED ::  <b><font color = red>F3</font></b>");
  49.                                 break;
  50.                         case Qt::Key_F4 :
  51.                                 qDebug() << "You have PRESSED ::  F4";
  52.                                 QMessageBox::information(this,"key pressed", "You have PRESSED ::  <b><font color = red>F4</font></b>");
  53.                                 break;
  54.                         case Qt::Key_F5 :
  55.                                 qDebug() << "You have PRESSED ::  F5";
  56.                                 QMessageBox::information(this,"key pressed", "You have PRESSED ::  <b><font color = red>F5</font></b>");
  57.                         case Qt::Key_F6 :
  58.                                 qDebug() << "You have PRESSED ::  F6";
  59.                                 QMessageBox::information(this,"key pressed", "You have PRESSED ::  <b><font color = red>F6</font></b>");
  60.                                 break;
  61.                         case Qt::Key_F7 :
  62.                                 qDebug() << "You have PRESSED ::  F7";
  63.                                 QMessageBox::information(this,"key pressed", "You have PRESSED ::  <b><font color = red>F7</font></b>");
  64.                                 break;
  65.                         case Qt::Key_F8 :
  66.                                 qDebug() << "You have PRESSED ::  F8";
  67.                                 QMessageBox::information(this,"key pressed", "You have PRESSED ::  <b><font color = red>F8</font></b>");
  68.                                 break;
  69.                         case Qt::Key_F9 :
  70.                                 qDebug() << "You have PRESSED ::  F9";
  71.                                 QMessageBox::information(this,"key pressed", "You have PRESSED ::  <b><font color = red>F9</font></b>");
  72.                                 break;
  73.                         case Qt::Key_F10 :
  74.                                 qDebug() << "You have PRESSED ::  F10";
  75.                                 QMessageBox::information(this,"key pressed", "You have PRESSED ::  <b><font color = red>F10</font></b>");
  76.                                 break;
  77.                         case Qt::Key_F11 :
  78.                                 qDebug() << "You have PRESSED ::  F11";
  79.                                 QMessageBox::information(this,"key pressed", "You have PRESSED ::  <b><font color = red>F11</font></b>");
  80.                                 break;
  81.                         case Qt::Key_F12 :
  82.                                 qDebug() << "You have PRESSED ::  F12";
  83.                                 QMessageBox::information(this,"key pressed", "You have PRESSED ::  <b><font color = red>F12</font></b>");
  84.                                 break;
  85.                         case Qt::Key_Return :
  86.                                 qDebug() << "You have PRESSED ::  RETURN";
  87.                                 QMessageBox::information(this,"key pressed", "You have PRESSED ::  <b><font color = red>RETURN</font></b>");
  88.                                 break;
  89.                         case Qt::Key_Enter :
  90.                                 qDebug() << "You have PRESSED ::  ENTER";
  91.                                 QMessageBox::information(this,"key pressed", "You have PRESSED ::  <b><font color = red>ENTER</font></b>");
  92.                                 break;
  93.  
  94.                         case Qt::Key_Space :
  95.                                 qDebug() << "You have PRESSED ::  SPACE";
  96.                                 QMessageBox::information(this,"key pressed", "You have PRESSED ::  <b><font color = red>SPACE</font></b>");
  97.                                 break;
  98.                         case Qt::Key_Shift :
  99.                                 qDebug() << "You have PRESSED ::  SHIFT";
  100.                                 QMessageBox::information(this,"key pressed", "You have PRESSED ::  <b><font color = red>SHIFT</font></b>");
  101.                                 break;
  102.                         case Qt::Key_CapsLock :
  103.                                 qDebug() << "You have PRESSED ::  CAPSLOCK";
  104.                                 QMessageBox::information(this,"key pressed", "You have PRESSED ::  <b><font color = red>CAPSLOCK</font></b>");
  105.                                 break;
  106.                          case Qt::Key_Delete :
  107.                                 qDebug() << "You have PRESSED ::  DELETE";
  108.                                 QMessageBox::information(this,"key pressed", "You have PRESSED ::  <b><font color = red>DELETE</font></b>");
  109.                                 break;
  110.  
  111.                         case Qt::Key_Left:
  112.                                 qDebug() << "You have PRESSED :: <-";
  113.                                 QMessageBox::information(this,"key pressed", "You have PRESSED ::  <b><font color = red> <- </font></b>");
  114.                                 break;
  115.                         case Qt::Key_Right:
  116.                                 qDebug() << "You have PRESSED ::->";
  117.                                 QMessageBox::information(this,"key pressed", "You have PRESSED ::  <b><font color = red>-></font></b>");
  118.                                 break;
  119.                         case Qt::Key_Down:
  120.                                 qDebug() << "You have PRESSED :: uparrow";
  121.                                 QMessageBox::information(this,"key pressed", "You have PRESSED ::  <b><font color = red>UPARROW</font></b>");
  122.                                 break;
  123.                         case Qt::Key_Up :
  124.                                 qDebug() << "You have PRESSED :: DownArrow";
  125.                                 QMessageBox::information(this,"key pressed", "You have PRESSED ::  <b><font color = red>DownArrow</font></b>");
  126.                         default:
  127.                                 str = ke->text();
  128.                                 qDebug() << "You have PRESSED ::  " << str;
  129.                                 str = str.prepend("You have PRESSED :: <b><font color = red>");
  130.                                 str = str.append("</font></b>");
  131.                                 QMessageBox::information(this,"key pressed", str);
  132.                                 break;
  133.                 }
  134.  
  135.  
  136.  
  137.         }
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Please help me ASAP
Thanks in advance

Regards,
Rohith.G