import java.awt.Point;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;

public class MouseInput1 implements MouseListener, MouseMotionListener {

  private static final int BUTTON_COUNT = 3;
  // Polled position of the mouse cursor
  private Point mousePos = null;
  // Current position of the mouse cursor
  private Point currentPos = null;
  // Current state of mouse buttons
  private boolean[] state = null;
  // Polled mouse buttons
  private MouseState[] poll = null;
	
  private enum MouseState {
    RELEASED, // Not down
    PRESSED,  // Down, but not the first time
    ONCE      // Down for the first time
  }
	
  public MouseInput1() {
    // Create default mouse positions
    mousePos = new Point( 0, 0 );
    currentPos = new Point( 0, 0 );
    // Setup initial button states
    state = new boolean[ BUTTON_COUNT ];
    poll = new MouseState[ BUTTON_COUNT ];
    for( int i = 0; i < BUTTON_COUNT; ++i ) {
      poll[ i ] = MouseState.RELEASED;
    }
  }
	
  public synchronized void poll() {
    // Save the current location
    mousePos = new Point( currentPos );
    // Check each mouse button
    for( int i = 0; i < BUTTON_COUNT; ++i ) {
      // If the button is down for the first
      // time, it is ONCE, otherwise it is
      // PRESSED.  
      if( state[ i ] ) {
        if( poll[ i ] == MouseState.RELEASED )
          poll[ i ] = MouseState.ONCE;
        else
          poll[ i ] = MouseState.PRESSED;
      } else {
          // button is not down
          poll[ i ] = MouseState.RELEASED;
      }
    }
  }

  public Point getPosition() {
    return mousePos;
  }

  public boolean buttonDownOnce( int button ) {
    return poll[ button-1 ] == MouseState.ONCE;
  }

  public boolean buttonDown( int button ) {
    return poll[ button-1 ] == MouseState.ONCE ||
           poll[ button-1 ] == MouseState.PRESSED;
  }
  
  public synchronized void mousePressed( MouseEvent e ) {
    state[ e.getButton()-1 ] = true;
  }

  public synchronized void mouseReleased( MouseEvent e ) {
    state[ e.getButton()-1 ] = false;
  }

  public synchronized void mouseEntered( MouseEvent e ) {
    mouseMoved( e );
  }
  
  public synchronized void mouseExited( MouseEvent e ) {
    mouseMoved( e );
  }
  
  public synchronized void mouseDragged( MouseEvent e ) {
    mouseMoved( e );
  }

  public synchronized void mouseMoved( MouseEvent e ) {
    currentPos = e.getPoint();
  }
  
  public void mouseClicked( MouseEvent e ) {
    // Not needed
  }
}