1 | /**
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2 | *#########################################################################
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3 | *
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4 | * A component of the Gatherer application, part of the Greenstone digital
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5 | * library suite from the New Zealand Digital Library Project at the
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6 | * University of Waikato, New Zealand.
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7 | *
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8 | * <BR><BR>
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9 | *
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10 | * Principal Author: John Thompson, NZDL Project, University of Waikato
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11 | *
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12 | * <BR><BR>
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13 | *
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14 | * Copyright (C) 1999 New Zealand Digital Library Project
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15 | *
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16 | * <BR><BR>
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17 | *
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18 | * This program is free software; you can redistribute it and/or modify
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19 | * it under the terms of the GNU General Public License as published by
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20 | * the Free Software Foundation; either version 2 of the License, or
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21 | * (at your option) any later version.
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22 | *
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23 | * <BR><BR>
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24 | *
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25 | * This program is distributed in the hope that it will be useful,
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26 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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27 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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28 | * GNU General Public License for more details.
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29 | *
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30 | * <BR><BR>
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31 | *
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32 | * You should have received a copy of the GNU General Public License
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33 | * along with this program; if not, write to the Free Software
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34 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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35 | *########################################################################
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36 | */
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37 | package org.greenstone.gatherer.gui;
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38 |
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39 | import java.awt.*;
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40 | import java.io.*;
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41 | import java.net.*;
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42 | import java.util.*;
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43 | import javax.swing.*;
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44 | import javax.swing.event.*;
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45 | import javax.swing.tree.*;
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46 | import org.greenstone.gatherer.Configuration;
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47 | import org.greenstone.gatherer.DebugStream;
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48 | import org.greenstone.gatherer.Dictionary;
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49 | import org.greenstone.gatherer.Gatherer;
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50 | import org.greenstone.gatherer.util.JarTools;
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51 | import org.greenstone.gatherer.util.StaticStrings;
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52 | import org.greenstone.gatherer.util.XMLTools;
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53 | import org.w3c.dom.*;
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54 |
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55 |
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56 | /**
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57 | * This class provides a nice help facility. It is a separate frame that can be positioned
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58 | * as the user wishes, and provides a contents page and the help information.
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59 | * @author Michael Dewsnip, NZDL Project
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60 | */
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61 | public class HelpFrame
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62 | extends JFrame
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63 | {
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64 | /** The size of the frame */
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65 | static private final Dimension SIZE = new Dimension(800, 560);
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66 |
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67 | static private HelpFrame self = null;
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68 |
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69 | /** The help view at the bottom of the frame. */
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70 | static private JEditorPane help_pane = null;
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71 | /** The help contents tree at the top of the frame. */
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72 | static private JTree help_contents_tree = null;
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73 | /** The help contents tree model. */
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74 | static private HelpContentsTreeModel help_contents_tree_model = null;
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75 | /** The split between the contents tree and the page view. */
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76 | static private JSplitPane split_pane = null;
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77 |
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78 | public HelpFrame()
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79 | {
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80 | setDefaultCloseOperation(HIDE_ON_CLOSE);
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81 | setSize(SIZE);
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82 | setTitle(Dictionary.get("Help.Title"));
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83 |
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84 | help_pane = new JEditorPane();
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85 | help_pane.setEditable(false);
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86 | help_pane.addHyperlinkListener(new HelpPaneHyperlinkListener());
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87 |
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88 | HelpContentsTreeNode help_tree_root_node = new HelpContentsTreeNode(null, Dictionary.get("Help.Contents"));
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89 | help_contents_tree_model = new HelpContentsTreeModel(help_tree_root_node);
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90 | help_contents_tree = new JTree((DefaultTreeModel) help_contents_tree_model);
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91 | help_contents_tree.addTreeSelectionListener(new HelpContentsTreeSelectionListener());
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92 | help_contents_tree.setExpandsSelectedPaths(true);
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93 |
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94 | // Creation
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95 | JPanel content_pane = (JPanel) this.getContentPane();
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96 | split_pane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT);
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97 | JScrollPane help_contents_tree_scroll = new JScrollPane(help_contents_tree);
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98 | JScrollPane help_pane_scroll = new JScrollPane(help_pane);
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99 |
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100 | // Layout
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101 | split_pane.add(help_contents_tree_scroll, JSplitPane.LEFT);
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102 | split_pane.add(help_pane_scroll, JSplitPane.RIGHT);
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103 | content_pane.setLayout(new BorderLayout());
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104 | content_pane.add(split_pane, BorderLayout.CENTER);
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105 |
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106 | // Center
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107 | Dimension screen_size = Toolkit.getDefaultToolkit().getScreenSize();
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108 | setLocation((screen_size.width - SIZE.width) / 2, (screen_size.height - SIZE.height) / 2);
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109 |
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110 |
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111 | // Pretty corner icon
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112 | String gsmall_image = "gatherer_small.gif";
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113 | if (Configuration.fedora_info.isActive()) {
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114 | gsmall_image = "fli-" + gsmall_image;
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115 | }
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116 |
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117 | this.setIconImage(JarTools.getImage(gsmall_image).getImage());
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118 |
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119 | self = this;
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120 | }
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121 |
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122 | public void destroy()
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123 | {
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124 | help_contents_tree = null;
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125 | help_pane = null;
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126 | }
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127 |
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128 |
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129 | /** Retrieve the relative file path to the language-specific help index xml file. */
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130 | private String getHelpFolder()
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131 | {
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132 | String help_folder = "help/" + Configuration.getLanguage() + "/";
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133 |
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134 | // Applet case: get help files out of JAR file
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135 | if (Gatherer.isApplet && JarTools.getResource("/" + help_folder) != null) {
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136 | return help_folder;
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137 | }
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138 |
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139 | // Normal case: get help files out of GLI "help" folder
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140 | if (new File(help_folder).exists()) {
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141 | return help_folder;
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142 | }
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143 |
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144 | // Resort to English
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145 | return "help/" + StaticStrings.ENGLISH_LANGUAGE_STR + "/";
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146 | }
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147 |
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148 |
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149 | private URL getURLForSection(String section_name)
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150 | {
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151 | // Form the path to the help file from the section name
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152 | if (section_name != null) {
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153 | String help_file_path = getHelpFolder() + section_name + StaticStrings.HTM_FILE_EXTENSION;
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154 |
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155 | try {
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156 | // Applet case: get help file out of JAR file
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157 | if (Gatherer.isApplet) {
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158 | return JarTools.getResource("/" + help_file_path);
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159 | }
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160 |
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161 | // Normal case: get help file out of GLI "help" folder
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162 | return (new File(help_file_path)).toURL();
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163 | }
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164 | catch (Exception exception) {
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165 | DebugStream.printStackTrace(exception);
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166 | }
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167 | }
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168 |
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169 | return null;
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170 | }
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171 |
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172 |
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173 | static private void selectHelpContentsTreeNode(String section_name)
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174 | {
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175 | // Find the tree node with this section name, then select it
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176 | selectHelpContentsTreeNode(help_contents_tree_model.getHelpContentsTreeNodeNamed(section_name));
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177 | }
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178 |
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179 |
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180 | static private void selectHelpContentsTreeNode(HelpContentsTreeNode help_tree_node)
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181 | {
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182 | // Ensure the node in the help contents tree is selected and visible
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183 | TreePath help_tree_node_path = new TreePath(help_tree_node.getPath());
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184 | help_contents_tree.setSelectionPath(help_tree_node_path);
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185 | help_contents_tree.scrollPathToVisible(help_tree_node_path);
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186 | }
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187 |
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188 |
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189 | static public void setView(String section_name)
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190 | {
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191 | // Select the appropriate node in the help contents tree
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192 | selectHelpContentsTreeNode(section_name);
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193 |
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194 | // Show the help page with the specified section name
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195 | self.showHelpPage(section_name);
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196 | }
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197 |
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198 |
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199 | private void showHelpPage(String section_name)
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200 | {
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201 | // Find the tree node with this section name, then show the page for the node
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202 | showHelpPage(getURLForSection(section_name));
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203 | }
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204 |
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205 |
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206 | private void showHelpPage(URL help_page_url)
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207 | {
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208 | // Display the selected page
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209 | if (help_page_url != null) {
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210 | try {
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211 | help_pane.setPage(help_page_url);
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212 | }
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213 | catch (Exception exception) {
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214 | DebugStream.printStackTrace(exception);
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215 | }
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216 | }
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217 |
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218 | // Make the help frame visible
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219 | setVisible(true);
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220 | split_pane.setDividerLocation(0.4);
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221 | }
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222 |
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223 |
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224 | private class HelpContentsTreeModel
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225 | extends DefaultTreeModel
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226 | {
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227 | public HelpContentsTreeModel(MutableTreeNode help_tree_root_node)
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228 | {
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229 | super(help_tree_root_node);
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230 |
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231 | // Load the XML help index file and build the contents structure from it
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232 | try {
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233 | String help_index_file_path = getHelpFolder() + "help_index.xml";
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234 | Document document = null;
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235 | if (Gatherer.isApplet && JarTools.getResource(help_index_file_path) != null) {
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236 | document = XMLTools.parseXMLFile(help_index_file_path, true);
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237 | }
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238 |
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239 | if (new File(help_index_file_path).exists()) {
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240 | document = XMLTools.parseXMLFile(help_index_file_path, false);
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241 | }
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242 |
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243 | if (document == null) {
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244 | String errormsg = "HelpFrame.HelpContentsTreeModel constructor(): There's no help document after parsing";
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245 | System.err.println(errormsg);
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246 | DebugStream.println(errormsg);
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247 | return;
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248 | }
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249 | // Traverse the help hierarchy, building a tree representing its structure
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250 | Node document_node = document.getFirstChild();
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251 |
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252 | // Add a help contents tree node for each major section
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253 | int section_number = 0;
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254 | NodeList children = document_node.getChildNodes();
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255 | for (int i = 0; i < children.getLength(); i++) {
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256 | Node child = children.item(i);
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257 | if (child.getNodeName().equals(StaticStrings.SECTION_ELEMENT)) {
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258 | section_number++;
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259 | buildHelpContentsTree(help_tree_root_node, section_number + StaticStrings.EMPTY_STR, child);
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260 | }
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261 | }
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262 | }
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263 | catch (Exception exception) {
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264 | DebugStream.printStackTrace(exception);
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265 | }
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266 | }
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267 |
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268 |
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269 | private void buildHelpContentsTree(MutableTreeNode parent, String pos, Node node)
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270 | {
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271 | // Determine the section name
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272 | String section_name = ((Element) node).getAttribute(StaticStrings.NAME_ATTRIBUTE);
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273 |
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274 | // Determine the section title
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275 | String section_title = "";
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276 | NodeList children = node.getChildNodes();
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277 | for (int i = 0; i < children.getLength(); i++) {
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278 | Node child = children.item(i);
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279 | if (child.getNodeName().equals(StaticStrings.TITLE_ELEMENT)) {
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280 | section_title = pos + ": ";
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281 | if (child.getFirstChild() != null) {
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282 | section_title += child.getFirstChild().getNodeValue();
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283 | }
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284 | }
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285 | }
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286 |
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287 | // Add the node into the tree
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288 | HelpContentsTreeNode help_tree_node = new HelpContentsTreeNode(section_name, section_title);
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289 | insertNodeInto(help_tree_node, parent, parent.getChildCount());
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290 |
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291 | // Apply recursively to the children of this node
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292 | int section_number = 0;
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293 | for (int i = 0; i < children.getLength(); i++) {
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294 | Node child = children.item(i);
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295 | if (child.getNodeName().equals(StaticStrings.SECTION_ELEMENT)) {
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296 | section_number++;
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297 | buildHelpContentsTree(help_tree_node, pos + StaticStrings.STOP_CHARACTER + section_number, child);
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298 | }
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299 | }
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300 | }
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301 |
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302 |
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303 | private HelpContentsTreeNode getHelpContentsTreeNodeNamed(String section_name)
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304 | {
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305 | // Find the node with name matching section name, somewhere in the tree
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306 | if (section_name != null) {
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307 | Enumeration descendants = ((DefaultMutableTreeNode) root).preorderEnumeration();
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308 | while (descendants.hasMoreElements()) {
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309 | HelpContentsTreeNode help_tree_node = (HelpContentsTreeNode) descendants.nextElement();
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310 | if (section_name.equals(help_tree_node.section_name)) {
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311 | return help_tree_node;
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312 | }
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313 | }
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314 | }
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315 |
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316 | // Couldn't be found, so just return the root (Contents) node
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317 | return (HelpContentsTreeNode) root;
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318 | }
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319 | }
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320 |
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321 |
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322 | /** This listener is used to listen for selection changes in the contents tree, and
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323 | * to show the appropriate page as required.
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324 | */
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325 | private class HelpContentsTreeSelectionListener
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326 | implements TreeSelectionListener
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327 | {
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328 | /** Any implementation of <i>TreeSelectionListener</i> must include this method so we can be informed when the tree selection changes.
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329 | * @param event A <strong>TreeSelectionEvent</strong> containing al the relevant information about the event itself.
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330 | */
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331 | public void valueChanged(TreeSelectionEvent event)
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332 | {
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333 | HelpContentsTreeNode help_tree_node = (HelpContentsTreeNode) event.getPath().getLastPathComponent();
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334 | selectHelpContentsTreeNode(help_tree_node);
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335 | showHelpPage(help_tree_node.section_name);
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336 | }
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337 | }
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338 |
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339 |
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340 | /** This class provides a wrapper around a <strong>DefaultMutableTreeNode</strong> which
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341 | * provides the ability to set an html page to be loaded when this node is selected.
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342 | */
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343 | private class HelpContentsTreeNode
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344 | extends DefaultMutableTreeNode
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345 | {
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346 | /** The unique name of the section (matches the HTML filename) */
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347 | public String section_name = null;
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348 | /** The title to be displayed for this tree node. */
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349 | public String section_title = null;
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350 |
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351 | public HelpContentsTreeNode(String section_name, String section_title)
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352 | {
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353 | this.section_name = section_name;
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354 | this.section_title = section_title;
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355 | }
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356 |
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357 | public String toString()
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358 | {
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359 | return section_title;
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360 | }
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361 | }
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362 |
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363 |
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364 | private class HelpPaneHyperlinkListener
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365 | implements HyperlinkListener
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366 | {
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367 | public void hyperlinkUpdate(HyperlinkEvent e)
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368 | {
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369 | if (e.getEventType() == HyperlinkEvent.EventType.ACTIVATED) {
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370 | // Determine which node in the help contents tree to select, then select it
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371 | String section_link = e.getURL().getFile();
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372 | if (section_link.endsWith(".htm")) {
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373 | section_link = section_link.substring(section_link.lastIndexOf("/") + 1);
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374 | section_link = section_link.substring(0, section_link.length() - ".htm".length());
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375 | selectHelpContentsTreeNode(section_link);
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376 | }
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377 |
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378 | // Change to the page specified by the link
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379 | showHelpPage(e.getURL());
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380 | }
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381 | }
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382 | }
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383 | }
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