AlertBox.java

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/* This page is part of the Game of Life source code */

/*
 * Easily show an alert.
 * Copyright 2003 Edwin Martin <edwin@bitstorm.org>
 *
 */
package org.bitstorm.util;

import java.awt.AWTEvent;
import java.awt.Button;
import java.awt.Dialog;
import java.awt.Dimension;
import java.awt.Event;
import java.awt.FlowLayout;
import java.awt.Frame;
import java.awt.GridLayout;
import java.awt.Image;
import java.awt.Label;
import java.awt.Panel;
import java.awt.Point;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.StringTokenizer;


/**
 * AlertBox shows a message besides a warning symbol.
 * @author Edwin Martin
 *
 */
public class AlertBox extends Dialog {
  private Button okButton;

  /**
   * Contructs a AlertBox.
   * 
   * Use the newline character '\n' in the message to seperate lines.
   * 
   * @param parent parent frame
   * @param title title of the dialog box
   * @param message the message to show
   */
  public AlertBox( Frame parent, String title, String message ) {
    super( parent, title, false );
    
    Image alertImage = Toolkit.getDefaultToolkit().getImage(this.getClass().getResource("alert.gif"));
    ImageComponent alertImageComponent = new ImageComponent( alertImage );
    okButton = new Button(" OK ");
    okButton.addActionListener(
      new ActionListener() {
        public void actionPerformed(ActionEvent e) {
          close();
        }
      }
    );
    Panel buttonPanel = new Panel();
    buttonPanel.setLayout( new FlowLayout( FlowLayout.CENTER ) );
    buttonPanel.add( okButton );
    StringTokenizer st = new StringTokenizer( message, "\n" );
    Panel messagePanel = new Panel( new GridLayout( st.countTokens(), 1 ) );
    while ( st.hasMoreTokens() ) {
      messagePanel.add( new Label( st.nextToken() ) );
    }
    add( "West", alertImageComponent );
    add( "Center", messagePanel );
    add( "South", buttonPanel );
    enableEvents(Event.WINDOW_DESTROY);
    setResizable( false );
    setModal( true );
    pack();
    Point p = parent.getLocation();
    Dimension dim = parent.getSize();
    setLocation( p.x+dim.width/2-150, p.y+dim.height/2-75 );
    show();
  }
    
  /**
   * Close dialog box.
   */
  private void close() {
    this.hide();
    this.dispose();
  }
  /**
   * Process close window button.
   * @see java.awt.Component#processEvent(java.awt.AWTEvent)
   */
  public void processEvent( AWTEvent e ) {
    if ( e.getID() == Event.WINDOW_DESTROY )
      close();
  }

}