/*
 * 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.AWTEvent;
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.Frame;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowEvent;

import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.border.EtchedBorder;

/**
 * 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 final String LICENSE = "resources/gpl.txt";

    /**
     * construct an <code>AboutBox</code>.
     *
     * @param parent  the parent frame of the about box
     */
    public AboutBox(final 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 */
        final Container contentPane = getContentPane();
        final JPanel infoPane = new JPanel();
        final JPanel imagePane = new JPanel();
        final JPanel textPane = new JPanel();
        final JPanel buttonPane = new JPanel();
        final JPanel northPane = new JPanel();
        final JPanel emptyPane = new JPanel();
        final LicensePane licPane = new LicensePane(new Dimension(650, 200), LICENSE);
        final JLabel imageLabel = new JLabel(new ImageIcon(this.getClass().getResource(
            Util.getResourceString("splashImage"))));
        final JLabel emptyLabel = new JLabel("");
        final JLabel appTitleLabel = new JLabel(FrmMain.APP_NAME);
        final JLabel appStageLabel = new JLabel(FrmMain.VERSION);
        final JLabel appCopyrightLabel = new JLabel("Copyright (c) 2002-2008 Ulrich Hilger, Dimitry Polivaev");
        final 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(final 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(final ActionEvent e) {
        if (e.getSource() == closeButton) {
            cancel();
        }
    }
}