/**
 * Element.java  1.00 96/10/07 Merlin Hughes
 *
 * Copyright (c) 1996 Prominence Dot Com, Inc. All Rights Reserved.
 *
 * Permission to use, copy, modify, and distribute this software
 * for non-commercial purposes and without fee is hereby granted
 * provided that this copyright notice appears in all copies.
 *
 * http://prominence.com/                  merlin@prominence.com
 */
import java.awt.*;
import java.util.*;
import java.net.*;

public class Element {
  Page parent;
  URL url;
  String name, comment;
  boolean open, selected;
  Element sibling, offspring;

  public Element (URL url, String name, String comment, Page parent) {
    this.parent = parent;
    this.url = url;
    this.name = name;
    this.comment = comment;
  }

  int myHeight () {
    int h = (offspring == null) ? parent.docH :
      (open) ? parent.openH : parent.dirH;
    return (parent.textH > h) ? parent.textH : h + 1;
  }

  public int getHeight () {
    int h = myHeight ();
    if (open && (offspring != null))
      h += offspring.getHeight ();
    if (sibling != null)
      return h + sibling.getHeight ();
    else
      return h;
  }

  Element locate (int mX, int mY, Point xy) {
    int x = xy.x, y = xy.y, h = myHeight (),
      w = (offspring == null) ? parent.docW : (open) ? parent.openW : parent.dirW;
    if ((mX >= x) && (mY >= y) && (mY < y + h) &&
	(mX < x + w + 4 + parent.getFontMetrics (parent.getFont ()).stringWidth (name)))
      return this;
    xy.translate (0, h);
    if (open && (offspring != null)) {
      xy.translate (w + 4, 0);
      Element l = offspring.locate (mX, mY, xy);
      if (l != null)
	return l;
      xy.translate (-(w + 4), 0);
    }
    if (sibling != null)
      return sibling.locate (mX, mY, xy);
    else
      return null;
  }

  void paint (Graphics g, int oX, int oY, Point xy) {
    int x = xy.x, y = xy.y, h = myHeight (),
      w = (offspring == null) ? parent.docW :
                                (open) ? parent.openW : parent.dirW;
    xy.translate (0, h);

    if ((oY < parent.size ().height) && (y + h / 2 > 0))
      g.drawLine (oX, oY, oX, y + h / 2);

    if ((y < parent.size ().height) && (y + h > 0)) {
      g.drawLine (oX, y + h / 2, x + w / 2, y + h / 2);
      Color c = g.getColor ();
      if (selected)
	g.setColor (Color.red);
      g.drawString (name, x + w + 4, y + (h - parent.textH) / 2 + parent.textA);
      if (selected)
	g.setColor (c);
    }
      
    if (open && (offspring != null)) {
      xy.translate (w + 4, 0);
      offspring.paint (g, x + w / 2, y + h / 2, xy);
      xy.translate (-(w + 4), 0);
    }

    if ((y < parent.size ().height) && (y + h > 0)) {
      if (offspring == null)
	g.drawImage (parent.doc, x, y + (h - parent.docH) / 2, parent);
      else if (open)
	g.drawImage (parent.open, x, y + (h - parent.openH) / 2, parent);
      else
	g.drawImage (parent.dir, x, y + (h - parent.dirH) / 2, parent);
    }
      
    if (sibling != null)
      sibling.paint (g, oX, y + h / 2, xy);
  }
}