Because it's quite old project I don't have any choice and have to use Qt 3.3.3/Embedded. I have to display a file. As the display fills up, a vertical scrollbar is displayed. Problem is control that scrollbar now it dosen't work as I want. I press keyUp or keyDown, scrollbar goes up, reaches top and then with every next press scrollbar decreases.

Part of constructor:
Qt Code: 
  1. textEdit = new QTextEdit(this);
  2. textEdit->setGeometry(1,2, 639,425);
  3. textEdit->setPaper(Qt::black);
  4. textEdit->setColor(Qt::white);
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Part of readFile function:
Qt Code: 
  1. QFile fp("errors.txt");
  2. char buff[255];
  3. fp.open(IO_ReadOnly);
  4. textEdit->setCurrentFont(font);
  5. while (!fp.atEnd() ) {
  6. 	fp.readLine(buff, sizeof(buff));
  7. 	textEdit->append(buff);
  8. }
  9. fp.close();
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Part of handling device's keyboard:
Qt Code: 
  1. bool keyHandled = false;
  2. switch (event->key()) {
  3. 	case Key_Up:
  4. 		keyHandled = true;
  5. 		textEdit->moveCursor(QTextEdit::MoveUp, 0);
  6. 		update();
  7. 	break;
  8.  
  9. 	case Key_Down:
  10. 		keyHandled = true;
  11. 		textEdit->moveCursor(QTextEdit::MoveDown, 0);
  12. 		update();
  13. 	break;
  14.  
  15. 	default:
  16. 		keyHandled = false;
  17. 	break;
  18. }
  19. return keyHandled;
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