import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Form extends JPanel implements ActionListener {
  private JLabel[] l;
  private JTextField[] f;
  private JButton okButton;

  public Form(String[] label, int[] fieldWidth) {
    if (label.length != fieldWidth.length)
      throw new IllegalArgumentException();
    l = new JLabel[label.length]; 
    f = new JTextField[label.length];
    int m1 = 0, m2 = 0;  
    // Create labels and textFields
    for (int i=0; i<l.length; i++) {
      l[i] = new JLabel(label[i] + " ", JLabel.RIGHT);
      f[i] = new JTextField(fieldWidth[i]); 
      f[i].setMaximumSize(f[i].getPreferredSize());
      f[i].addActionListener(this);
      m1 = Math.max(m1, l[i].getPreferredSize().width);
      m2 = Math.max(m2, f[i].getPreferredSize().width);
    }
    // Layout the components
    setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));
    add(Box.createVerticalGlue());
    for (int i=0; i<l.length; i++) {
      // Create row # i
      Panel p = new Panel();
      p.setLayout(new BoxLayout(p, BoxLayout.X_AXIS));
      p.add(Box.createHorizontalGlue());
      l[i].setPreferredSize(new Dimension(m1, l[i].getPreferredSize().height));
      p.add(l[i]); 
      p.add(f[i]);
      p.add(Box.createRigidArea(new Dimension(m2-f[i].getPreferredSize().width,1))); 
      p.add(Box.createHorizontalGlue());
      // Add row # i
      add(Box.createRigidArea(new Dimension(1,5)));
      add(p);
    } 
    add(Box.createRigidArea(new Dimension(1,5)));
    add(Box.createVerticalGlue());
  } 

  public String get(int i) {
    return f[i].getText().trim();
  }

  public void set(int i, String s) {
    f[i].setText(s);
  }

  public boolean check(int i) {
    if (f[i].getText().trim().length() > 0)
      return true;
    else {
      f[i].requestFocus();
      return false;
    }
  }

  public boolean checkAll() {
    for (int i=0; i<f.length; i++) 
      if (!check(i))
        return false;
    return true; 
  }  

  public void clear(int i) {
    f[i].setText("");
  }

  public void clearAll() {
    for (int i=0; i<f.length; i++) 
      clear(i);
  }

  @Override
  public void requestFocus() {
    f[0].requestFocus();
  }

  public void setButton(JButton b) {
    okButton = b;
  }

  public void actionPerformed(ActionEvent e) {
    if (okButton != null)
      okButton.doClick();
   }
}