/*
JDialog example with grid layout, combo boxes, showDialog() method wraps show()
method and when the dialog's fields have been changed returns true.

Mike Barnes
9/20/02
*/

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

public class AgeDialog extends JDialog  implements ActionListener {
   private JTextField nameTF;
   private JComboBox dayCB, monthCB;
   private JButton ok, cancel;
   private String name, day, month;
   private boolean okClosed;

   public AgeDialog (Frame owner, String title, boolean modality) {
      super(owner, title, modality);
      setResizable(false);
      okClosed = false;
      // create values for combo boxes
      String[] monthValues = {"January", "Feburary", "March", "April", "March",
        "June", "July", "August", "September", "October", "November",
        "December"};
      String[] dayValues = new String[31];
      for(int i = 0; i < 31; i++) 
         dayValues[i] = new String(Integer.toString(i + 1));

      Container dialogPane = getContentPane();
      dialogPane.setLayout(new GridLayout(7,1));

      JLabel nameLabel = new JLabel("Enter first name:");
      JLabel monthLabel = new JLabel("Select a month:");
      JLabel dayLabel = new JLabel("Enter an day:");

      nameTF = new JTextField(15);

      dayCB = new JComboBox(dayValues);
      monthCB = new JComboBox(monthValues);

      // buttons
      Box buttonBox = new Box(BoxLayout.X_AXIS);
      ok = new JButton("OK");
      cancel = new JButton("cancel");

      // listeners
      dayCB.addActionListener(this);
      monthCB.addActionListener(this);
      ok.addActionListener(this);
      cancel.addActionListener(this);

      buttonBox.add(Box.createHorizontalGlue());
      buttonBox.add(ok);
      buttonBox.add(Box.createHorizontalStrut(10));
      buttonBox.add(cancel);
      buttonBox.add(Box.createHorizontalGlue());

      dialogPane.add(nameLabel);
      dialogPane.add(nameTF);
      dialogPane.add(monthLabel);
      dialogPane.add(monthCB);
      dialogPane.add(dayLabel);
      dialogPane.add(dayCB);
      dialogPane.add(buttonBox);
      pack();
      }

   //  override show to place dialog in center of owner
   //  show returns true if dialog was changed else false.
   public boolean showDialog() {
      // set display properties
      Window owner = (Window) getParent();
      Dimension d = getSize();
      Rectangle r = owner.getBounds();
      int x = r.x + r.width/2;
      int y = r.y + r.height/2;
      setBounds(x, y, d.width, d.height);
      show();  // call Dialog's show() to display
      //  blocks thread since dialog is modal
      if (okClosed) {
          okClosed = false;
          return true; }  // return true, reset okClosed false
        else return false; 
      }
 
  // update values from dialog's UI components
  public void actionPerformed(ActionEvent e) {
      Object obj = e.getSource();
      if (obj == ok) {
            okClosed = true;  
            hide();  }
         else if (obj == cancel) { 
            okClosed = false; hide();
            clearAll();  }
         else if (obj == dayCB) day = 
            (String) (((JComboBox) obj).getSelectedItem());
         else month = (String) (((JComboBox) obj).getSelectedItem());
     }


  // accessor methods
  public String toString() {
    return (nameTF.getText() + " " + month + " " + day);
    }

  public void clearAll() {   // reset dialog's values
    name = month = day = " ";
    nameTF.setText(name);
    dayCB.setSelectedIndex(0);
    monthCB.setSelectedIndex(0);
    }

  }