package edu.jsu.leathrum.mathlets.shared;
import java.awt.event.*;

public class KeyHandlerSequence {

class Listener implements KeyListener {

  public void keyPressed(KeyEvent e) {}

  public void keyReleased(KeyEvent e) {
    for (int i=0; i<numInput-1; i++)
      if (inputList[i].isKey(e)) {
        inputList[i+1].requestFocus();
        inputList[i].doKeyAction(e);
        inputReturnActionList[i].doThis();
      }
    if (numInput>0 && inputList[numInput-1].isKey(e)) {
        inputList[0].requestFocus();
        inputList[numInput-1].doKeyAction(e);
        inputReturnActionList[numInput-1].doThis();
    }
  }

  public void keyTyped(KeyEvent e) {}
}

  Listener ll = new Listener();
  final int INPUTS = 4;
  KeyHandler[] inputList = new KeyHandler[INPUTS];
  ActionWrapper[] inputReturnActionList = new ActionWrapper[INPUTS];
  private int numInput=0;

  public void registerKeyHandler(KeyHandler item, ActionWrapper act) {
    while (numInput >= inputList.length) {
      KeyHandler[] newinlist = new KeyHandler[inputList.length+2*INPUTS];
      for (int i=0; i<inputList.length; i++)
        newinlist[i]=inputList[i];
      inputList=newinlist;
      ActionWrapper[] newwrlist = new ActionWrapper[inputReturnActionList.length+2*INPUTS];
      for (int i=0; i<inputReturnActionList.length; i++)
        newwrlist[i]=inputReturnActionList[i];
      inputReturnActionList=newwrlist;
    }
    item.addKeyListener(ll);
    inputList[numInput] = item;
    inputReturnActionList[numInput] = act;
    numInput++;
  }

  public void registerKeyHandler(KeyHandler item) {
    registerKeyHandler(item, new NullAction());
  }

}