/*	TextFieldAdvanceTest.java
*	@author: Charles Bell
*	@version: August 31, 2002

* 	Problem statement:
*	I have four textfields on a page. All take some input and use the input 
*	for calculation. When I press the enter key in one textfield I'd like to
*	move to the next textfield.
*/
import java.applet.*;
import java.awt.*;
import java.awt.event.*;

public class TextFieldAdvanceTest extends Applet implements ActionListener{
	
	private TextField textFieldA, textFieldB, textFieldC, textFieldD;
	private Button submit;
	private TextArea messageArea;
		
	public void init(){
		textFieldA = new TextField(20);
		textFieldB = new TextField(20);
		textFieldC = new TextField(20);
		textFieldD = new TextField(20);
		textFieldA.addActionListener(this);
		textFieldB.addActionListener(this);
		textFieldC.addActionListener(this);
		textFieldD.addActionListener(this);
		add(new Label("A"));
		add(textFieldA);
		add(new Label("B"));
		add(textFieldB);
		add(new Label("C"));
		add(textFieldC);
		add(new Label("D"));
		add(textFieldD);
		submit = new Button("Submit");
		submit.addActionListener(this);
		add(submit);
		messageArea = new TextArea(5,50);
		add(messageArea);
	}
	
	public void actionPerformed(ActionEvent actionEvent){
		Object source = actionEvent.getSource();
		if (source.equals(textFieldA)){
			messageArea.setText("Processing action from TextFieldA \nby requesting Focus for TextFieldB");
			textFieldB.requestFocus();
		}else if (source.equals(textFieldB)){
			messageArea.setText("Processing action from TextFieldB \nby requesting Focus for TextFieldC");
			textFieldC.requestFocus();
		}else if (source.equals(textFieldC)){
			messageArea.setText("Processing action from TextFieldC \nby requesting Focus for TextFieldD");
			textFieldD.requestFocus();
		}else if (source.equals(textFieldD)){
			messageArea.setText("Processing action from TextFieldD \nby requesting Focus for TextFieldA");
			textFieldA.requestFocus();
		}else if (source.equals(submit)){
			messageArea.setText("Processing action from Submit Button to submit form data.\n");
			String aString = textFieldA.getText();
			String bString = textFieldB.getText();
			String cString = textFieldC.getText();
			String dString = textFieldD.getText();
			submitData(aString, bString, cString, dString);
		}
	}

	public void submitData(String a, String b,  String c, String d){
			messageArea.append("Processed " + a + "\n" + b + "\n" + c + "\n" + d + "\n");		
	}
}