//Abby Walker
//homework5
//March 14, 2000
//a java applet that allows the user to type in a text field that changes color

import java.applet.*;
import java.awt.*;
import java.awt.event.*;

public class LetterBox extends Applet {
    //this class handles all of the button and there placements
    Panel center, ButtonPanel;
    LetterField myLetterField;

    public void init() {
      BorderLayout bl = new BorderLayout();
      ButtonPanel = new Panel();
      ButtonPanel.setLayout(bl);
      myLetterField  = new LetterField();
      this.setLayout(new BorderLayout());
      this.add("North", myLetterField); //adds the letterField to north
      this.add("Center", ButtonPanel); //center contains all letter buttons
      //and boarder buttons

      // add to north
      BorderButton northButton = new BorderButton("red", Color.red, this);
      ButtonPanel.add("North", northButton);

      // add to east
      BorderButton eastButton = new BorderButton("green", Color.green, this);
      ButtonPanel.add("East", eastButton);

      // add to south
      BorderButton southButton = new BorderButton("blue", Color.blue, this);
      ButtonPanel.add("South", southButton);
      
      // add to west
      BorderButton westButton = new BorderButton("yellow", Color.yellow, this);
      ButtonPanel.add("West", westButton);

      // add a panel in the middle and use a different layout
      center = new Panel();
      ButtonPanel.add("Center", center);
      GridLayout gr = new GridLayout(6,5);
      center.setLayout(gr);

      // creating 26 center buttons
      for (char c = 'A'; c <= 'Z'; c++) {
	  center.add(new CenterButton(String.valueOf(c),this));
      } // for
      center.add(new ClearButton(this)); //creates a button that clears the 
      //letter field
    } // init()
    
    Component [] GetPanelContents() {
	//this function gets all the components in the panel
	return center.getComponents();
    }//GetPanelConents

    int NumComponents() {
	//holds the total number of components in the panel
	return center.getComponentCount();
    }//NumComponents
} // class LetterBox


class BorderButton extends Button implements ActionListener {
    //BorderButton handles the outside buttons and changes
    //the colors of the center buttons
    LetterBox theBox;
    Color buttonColor;

    BorderButton(String s, Color newColor, LetterBox newBox) {
	super(s);
	buttonColor=newColor;
	theBox=newBox;
	this.setBackground(newColor);
	Font f = new Font("TimesRoman", Font.BOLD, 14);
	this.addActionListener(this);
    }//BorderButton

    public void actionPerformed(ActionEvent event) {
	//required by actionListener
	Component centerButtonArray[];
	centerButtonArray=theBox.GetPanelContents();
	
	//changes button and text field colors
	for(int i=0; i<theBox.NumComponents()-1; i++)
	   ((CenterButton) centerButtonArray[i]).ChangeColor(buttonColor);
	theBox.myLetterField.ChangeColor(buttonColor);
	repaint();
    }//actionPerformed
}//BorderButton class


class CenterButton extends Button implements ActionListener {
    //the centerButton class handles all the center buttons in the applet
    //when a center button is pressed the letter appears in the text field
    LetterBox theBox;
    String mystring;

    CenterButton(String s, LetterBox newBox) {
	super(s);
	mystring=s;
	theBox=newBox;
	this.setBackground(Color.red);
	this.setForeground(Color.white);

	Font f = new Font("TimesRoman", Font.BOLD, 14);
	this.setFont(f);
	this.addActionListener(this);
    }//CenterButton

    public void actionPerformed(ActionEvent event) {
	theBox.myLetterField.append(mystring.charAt(0));
    }//actionPerformed

    void ChangeColor(Color buttonColor) {
	//changes button colors
	this.setBackground(buttonColor);
    }//ChangeColor
}//CenterButton class


class ClearButton extends CenterButton implements ActionListener {
    //this class handles the button with a start on it, which clears the
    //text field

    ClearButton(LetterBox newBox) {
	super("*",newBox);
	this.setBackground(Color.black);
    }//ClearButton
    
    public void actionPerformed(ActionEvent event) {
	theBox.myLetterField.clear();
    }//actionPerformed
}//ClearButton class


class LetterField extends TextField {
    //the class handles the functions on the text field, such as typing
    //in the letter field and clearing the letter field
    public LetterField() {
	this.setText("");
	this.setEditable(false);
	this.setBackground(Color.black);
	this.setForeground(Color.white);
    }//LetterField

    public void clear() {
	super.setText("");
    }//clear

    public void append(char c) {
	super.setText(this.getText()+c);
    }//append

    public void setText(String s) {} //override TextComponet method
    //so it can't be used

    void ChangeColor(Color textColor) {
	this.setForeground(textColor);
    }//ChangeColor
}//class LetterField