// You may study, use, modify, and distribute this example for any purpose.
// This example is provided WITHOUT WARRANTY either expressed or implied.

import java.awt.*;
import java.applet.Applet;
/** This simulates a simple interaction with
	Text in the center and an OK Button underneath.
*/
public class TextDemo extends Applet {
/** A piece of text identifying the last click*/
	protected TextArea response;
/** An array of buttons */
	protected Button stimuli[];
/** The place in the Applet where the Buttons are put. */
	protected Panel  buttons;

/** Layout and display text and buttons.

    Set the background of text to white and put the label in the center,
	create a grey panel underneath. Create and add buttons to this
	panel
*/
    public TextDemo() {
	this.setBackground(Color.black);
	this.setLayout(new BorderLayout(5,5));

	response=new TextArea();
	resetResponse();
	response.setEditable( true );
	add("Center", response);

	buttons=new Panel();
	buttons.setBackground(Color.lightGray);
	buttons.setLayout(new FlowLayout(FlowLayout.CENTER, 10, 10));

	  stimuli=new Button[2];//until now the individual buttons
				//did not exist

	  stimuli[0]=new Button("OK");
	  buttons.add("OK", stimuli[0]);

	  stimuli[1]=new Button("No");
	  buttons.add("No", stimuli[1]);

	this.add("South", buttons);

    }//constructor

    protected void resetResponse(){
	response.setForeground(Color.black);
	response.setBackground(Color.white);
	response.setText( "This is a test of adding a TextArea\n");
	response.append("That you can Edit!!\n");
	/* was in JDK 1.0
		response.appendText("That you can Edit!!\n");
	*/
    }//resetResponse

/** Changes color to yellow, does something to content,
and if OK displays result in Green.  
<br>Else displays an exception in pink.
<p>Note. The something done to the text field is determined by
the actual class of this object, not the default TextDemo.something(...).
*/
    protected void responseDoSomething(){
	response.setBackground(Color.yellow);
	response.setVisible( true);
	try{
		response.setText( this.something(response.getText()));
		response.setBackground(Color.green);
		response.setVisible( true);
	}catch (Exception e){
		response.setBackground(Color.pink);
		response.setVisible( true);
		response.setText(e.toString());
	}//try
    }//resetResponse

    protected String something(String text) throws Exception
    {
	return text.replace('e','E');
    }//something


/** Reacts to OK by doing something special to text
	and to No by resetting text.
	@deprecated
*/
    public boolean action(Event event, Object arg) {
	if (event.target instanceof Button) {
		if(event.target == stimuli[0])
			responseDoSomething();
		else
			resetResponse();
		response.setVisible( true);
		return true;
	} else { 
		response.setText("Clunk!");//This doesn't happen.....why?
		response.setBackground(Color.pink);
		response.setVisible( true);
		return false;
	}
    }//action

/**Creates a frame in which the Applet can run, for debugging
	purposes.
*/
    public static void main(String args[]) {
	TextDemo textTest = new TextDemo();
		textTest.init();
		textTest.start();
	Frame f = new Frame("textTest");
		f.setBackground(Color.white);
		f.add("Center", textTest);
		f.setSize(500, 500);
		f.setVisible( true);
    }//main
}//TextDemo