Switch case

I'm using a rotary encoder to navigate a menu and use "switch" statements to control the 3 functions of the encoder.

void navigateMenus()
{
  MenuItem currentMenu=menu.getCurrent();

  switch (lastButtonPushed)
  {
  case encoderPushButton: // enter pin
    if(!(currentMenu.moveDown()))//if the current menu has a child and enter has been pressed  then navigate menu to item below
    {  
      menu.use();
    }
    else //otherwise, if menu has no child and enter has been pressed---- the current menu is used
    { 
      menu.moveDown();
    } 
    break;
  case buttonPinEsc:
    lcd.clear();
    menu.toRoot();  //back to main
    break;
  case 1: //Encoder right rotation
    menu.moveRight();
    break;      
  case 2: //Encoder left rotation
    menu.moveLeft();
    break;      
  }
  lastButtonPushed=0; //reset the lastButtonPushed variable
}

To get this far I have the rotary encoder set up as below

void readEncoder() //read the encoder and set lastButtonPushed to values used by navigateMenu()
{
  n = digitalRead(encoder0PinA);
  if ((encoder0PinALast == HIGH) && (n == LOW)) 
  {
    if (digitalRead(encoder0PinB) == LOW) 
    {
      lastButtonPushed = 1;
    } 
    else 
    {
      lastButtonPushed = 2;
    }
  } 
  encoder0PinALast = n;
}

What I would like to know is can I also use the same rotary action to increase a parameter instead of moving Right (case 1) or Left (case 2) through a menu. If it is possible, how would it be done?

I have a lot of views but no one has responed. can anyone offer any help on this matter