package interactors;

import java.util.Vector;
import java.awt.Rectangle;
import java.awt.event.*;

class Interactor {
    public static final int START = 0;
    public static final int RUNNING = 1;
    public static final int STOP = 2;

    // the state the interactor is current in
    int currentState;

    // the start event for the interactor
    int startEvent;

    // the stop event for the interactor
    int stopEvent;

    // the set of objects on which this interactor operates
    Vector<Rectangle> registeredObjs = new Vector<Rectangle>();

    // the object on which this interactor currently operates
    Rectangle selectedObj = null;

    // If the user does not provide a start event, then the user is
    // responsible for changing the current state to STOP when the
    // interactor should cease operating
    public Interactor(int start) {
	startEvent = start;
	stopEvent = -1;
    }

    public Interactor(int start, int stop) {
	startEvent = start;
	stopEvent = stop;
    }

    public int getStartEvent() { return startEvent; }
    public int getStopEvent() { return stopEvent; }
    public int getState() { return currentState; }
    public void setState(int newState) { currentState = newState; }

    // add an object to the list of objects on which the interactor operates
    public void add(Rectangle obj) {
	registeredObjs.add(obj);
    }

    // remove an object from the list of objects on which the interactor 
    // operators
    public void remove(Rectangle obj) {
	registeredObjs.remove(obj);
    }

    // determines if the interactor operates on any object that contains
    // the location of this mouse event
    public Rectangle findObject(MouseEvent e) {
	for (Rectangle r : registeredObjs) {
	    if (r.contains(e.getPoint())) {
		selectedObj = r;
		return r;
	    }
	}
	return null;
    }

    // these methods should be overridden by subclassing interactors.
    // the subclassing interactors should use these methods to compute
    // the information required for the startAction, runningAction, and
    // stopAction methods
    public void mousePressed(MouseEvent e) {}
    public void mouseReleased(MouseEvent e) {}
    public void mouseClicked(MouseEvent e) {}
    public void mouseMoved(MouseEvent e) {}
    public void mouseDragged(MouseEvent e) {}
}