// RegionStack.java
// Name:
// Login:
// Lab section time:

import java.awt.*;
import java.util.*;

public class RegionStack {

    public static boolean DEBUGGING = false;

    // Store a "stack" of regions, in which a Region may be moved
    // from the middle of the stack to the top.
    
    /**
     * EFFECT: Initialize an empty stack of regions.
     */
    public RegionStack ( ) {
	// *** you fill this in
    }
    
    /**
     * REQUIRES: r != null.
     * MODIFIES: this; System.out if DEBUGGING.
     * EFFECT: Add a region at the top of the stack.
     */
    public void add (Region r) {
	// *** you fill this in
    }

    /**
     * REQUIRES: x >= 0, y >= 0.
     * MODIFIES: this; System.out if DEBUGGING.
     * EFFECTS: The mouse has been clicked at position (x,y).
     * Find the top region on the stack (if any) that contains the
     * given coordinate, and move that region to the top of the stack
     * without disturbing the order of the other regions.
     * Then tell the moved region to handle the click.
     * If none of the regions on the stack were clicked on, just return.
     */
    public void handleClick (int x, int y) {
	// *** you fill this in
    }

    /**
     * REQUIRES: the stack of regions is not modified while
     * the iterator returned is in use.
     * EFFECT:  Return an iterator that returns regions in bottom-
     * to-top sequence.
     */
    public Iterator regions ( ) {
	// *** you fill this in
    }
    
    LinkedList myRegions;
}