/*
 * SimplyHTML, a word processor based on Java, HTML and CSS
 * Copyright (C) 2002 Ulrich Hilger
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

package com.lightdev.app.shtm;

import java.awt.event.ActionListener;
import java.awt.AWTEvent;
import java.awt.event.WindowEvent;
import java.awt.event.ActionEvent;
import java.awt.Frame;
import java.awt.Container;
import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import javax.swing.JDialog;
import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.JLabel;
import javax.swing.ImageIcon;
import java.awt.Font;
import java.awt.Dimension;
import javax.swing.border.*;

/**
 * A dialog to display information about application SimplyHTML.
 *
 * @author Ulrich Hilger
 * @author Light Development
 * @author <a href="http://www.lightdev.com">http://www.lightdev.com</a>
 * @author <a href="mailto:info@lightdev.com">info@lightdev.com</a>
 * @author published under the terms and conditions of the
 *      GNU General Public License,
 *      for details see file gpl.txt in the distribution
 *      package of this software
 *
 * 
 */

class AboutBox extends JDialog implements ActionListener {

  /** button to close the dialog */
  JButton closeButton = new JButton("Close");

  /** name of the license file */
  private String LICENSE = "resources/gpl.txt";

  /**
   * construct an <code>AboutBox</code>.
   *
   * @param parent  the parent frame of the about box
   */
  public AboutBox(Frame parent) {
    super(parent);
    enableEvents(AWTEvent.WINDOW_EVENT_MASK);
    closeButton.addActionListener(this);
    closeButton.setText(Util.getResourceString("closeBtnName"));
    constructFrame();
    setTitle(Util.getResourceString("aboutFrameTitle"));
    pack();
  }

  /**
   * construct the dialog contents
   */
  private void constructFrame() {
    /** initialize dialog components */
    Container contentPane = getContentPane();
    JPanel infoPane = new JPanel();
    JPanel imagePane = new JPanel();
    JPanel textPane = new JPanel();
    JPanel buttonPane = new JPanel();
    JPanel northPane = new JPanel();
    JPanel emptyPane = new JPanel();
    LicensePane licPane = new LicensePane(new Dimension(650,200), LICENSE);
    JLabel imageLabel = new JLabel(new ImageIcon(this.getClass().
		      getResource(Util.getResourceString("splashImage"))));
    JLabel emptyLabel = new JLabel("");
    JLabel appTitleLabel = new JLabel(FrmMain.APP_NAME);
    JLabel appStageLabel = new JLabel(FrmMain.VERSION);
    JLabel appCopyrightLabel =
                            new JLabel("Copyright (c) 2002-2008 Ulrich Hilger, Dimitry Polivaev");
    JLabel appHomepageLabel = new JLabel("http://simplyhtml.sf.net/");

    /* set the dialog title */
    setTitle("About this application");
    /* highlight the application name with an appropriate font */
    appTitleLabel.setFont(new Font("SansSerif", Font.BOLD, 12));

    /* load the application image into a panel */
    imagePane.setLayout(new FlowLayout());
    imagePane.add(imageLabel);
    imagePane.setBorder(new EtchedBorder(EtchedBorder.LOWERED));

    /**
     * textPane is the panel where all the application infos are shown.
     * Infos are shown in a one columns grid of labels, each on one row.
     */
    textPane.setLayout(new GridLayout(6, 1, 5, 5));
    textPane.add(emptyLabel);
    textPane.add(appTitleLabel);
    textPane.add(appStageLabel);
    textPane.add(appCopyrightLabel);
    textPane.add(appHomepageLabel);

    /**
     * infoPane shows the application image and the application info text
     * in a one row, two column grid.
     */
    infoPane.setLayout(new GridLayout(1,2, 5, 5));
    infoPane.add(imagePane);
    infoPane.add(textPane);

    /**
     * northPane is a helper pane to show application image and application
     * info text left aligned in the upper left corner of the dialog.
     */
    northPane.setLayout(new BorderLayout());
    northPane.add(infoPane, BorderLayout.WEST);
    northPane.add(emptyPane, BorderLayout.CENTER);

    /* panel for showing the close button at the dialog bottom */
    buttonPane.setLayout(new FlowLayout());
    buttonPane.add(closeButton);

    /**
     * now put together all parts of above application info and combine them
     * with license information
     */
    contentPane.setLayout(new BorderLayout());
    contentPane.add(northPane, BorderLayout.NORTH);
    contentPane.add(licPane, BorderLayout.CENTER);
    contentPane.add(buttonPane, BorderLayout.SOUTH);
  }

  /**
   * dispose the dialog properly in case of window close events
   */
  protected void processWindowEvent(WindowEvent e) {
    if (e.getID() == WindowEvent.WINDOW_CLOSING) {
      cancel();
    }
    super.processWindowEvent(e);
  }

  /**
   * dispose the dialog
   */
  private void cancel() {
    dispose();
  }

  /**
   * implements the ActionListener interface to be notified of
   * clicks onto the ok button. Closes and disposes the dialog in this case.
   */
  public void actionPerformed(ActionEvent e) {
    if (e.getSource() == closeButton) {
      cancel();
    }
  }

}