I have got a class MyLineEdit : QLineEdit

All I want is it to accept symbols if acceptSymbol() returns true and not accept it if it returns false. Has anybody got any idea why my implementation not working?

Qt Code: 
  1. void MyLineEdit::keyPressEvent(QKeyEvent *key)
  2. {
  3.  
  4.     if (key->key()==Qt::Key_Escape)
  5.         emit escapePressed();
  6.     else
  7.     {
  8.         if ((key->key() >=48 ) ||
  9.                 (key->key() <=57) ||
  10.                 (key->key() >=65 ) ||
  11.                 (key->key() <= 90) ||
  12.                 (key->key() >=97) ||
  13.                 (key->key() <=122))
  14.         {
  15.             QLineEdit::keyPressEvent(key);
  16.         }
  17.         else
  18.         {
  19.  
  20.             if (acceptSymbols())
  21.             {
  22.                 QLineEdit::keyPressEvent(key);
  23.             }
  24.         }
  25.     }
  26. }
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