import java.awt.*;
import java.applet.*;
import java.util.*;
import ColorMap;

public class Appletex extends Applet
{
  public void init() 
  {
    _partner_name = getParameter("partner");

    _color_map = new ColorMap();

    setLayout(new BorderLayout());

    Panel p = new Panel();
    p.setLayout(new FlowLayout());
    p.add(new Button("Send"));
    p.add(new Button("Clear"));

    add("South", p);
    _ta = new TextArea(20, 80);

    // parameter and default
    String color = getParameter("bgcolor");
    Color bg = _color_map.getColorParameter(color, Color.green);

    color = getParameter("fgcolor");
    Color fg = _color_map.getColorParameter(color, Color.blue);

    _ta.setBackground(bg);
    _ta.setForeground(fg);

    _ta.appendText("This is some sample text\nand\nthis\nis\ntoo.");
    add("Center", _ta);

  }

  private void clear_text(String nstr) {
    String str = _ta.getText();
    int len = str.length();
    _ta.replaceText(nstr, 0, len);    
  }
    
  public void receive(String data) {
    clear_text(data); 
  }

  // cannot do at init time, since partner may not exist yet
  // but may appear later

  private void send_to_partner() {

    if(_partner_name != null && _partner_name.length() > 0) {
      _partner = getAppletContext().getApplet(_partner_name);

      if(_partner != null) {
	((Appletex)_partner).receive(_ta.getText());
      } else {
	_ta.appendText("\nNo partner available.");
      }
    }
  }


  public boolean action(Event evt, Object arg) 
  {
    if(arg.equals("Clear"))
      {
	clear_text("");

      } else if(arg.equals("Send"))
      {
	send_to_partner();

      } else {
	super.action(evt,arg);
      }
    return true;
  }

  public String[][] getParameterInfo() {
    return _paraminfo;
  }

  public String getAppletInfo() {
    return _info;
  }

  private TextArea _ta;
  private String _info = "Demo applet written by Frederick Hirsch, v1.0";
  private Applet _partner;
  private String _partner_name;

  private String[][] _paraminfo = {
    {"bgcolor", "color", "background color"},
    {"fgcolor", "color", "foreground color"},
  };

  private ColorMap _color_map;
}