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.help;
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38 |
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39 | import calpa.html.*;
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40 | import java.awt.*;
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41 | import java.io.*;
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42 | import java.net.*;
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43 | import java.util.*;
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44 | import javax.swing.*;
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45 | import javax.swing.event.*;
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46 | import javax.swing.tree.*;
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47 | import org.apache.xerces.parsers.DOMParser;
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48 | import org.greenstone.gatherer.Dictionary;
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49 | import org.greenstone.gatherer.util.Utility;
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50 | import org.w3c.dom.*;
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51 |
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52 | /**
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53 | * This class provides a nice help facility. It is a separate frame that can be positioned
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54 | * as the user wishes, and provides a contents page and the help information.
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55 | * @author Michael Dewsnip, NZDL Project
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56 | */
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57 | public class HelpFrame
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58 | extends JFrame {
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59 |
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60 | /** The HTML rendering pane */
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61 | private CalHTMLPane view = null;
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62 | /** The contents tree model */
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63 | private ContentsModel model = null;
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64 | /** A contents tree for the top of the frame */
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65 | private JTree contents = null;
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66 |
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67 | private JSplitPane split_pane = null;
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68 |
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69 | /** The size of the frame */
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70 | static final Dimension SIZE = new Dimension(760, 560);
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71 |
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72 |
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73 | public HelpFrame()
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74 | {
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75 | setDefaultCloseOperation(HIDE_ON_CLOSE);
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76 | setSize(SIZE);
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77 |
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78 | view = new CalHTMLPane(new CalHTMLPreferences(), new Observer(), "Help Pages");
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79 |
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80 | HelpItem rootNode = new HelpItem(Dictionary.get("Help.Contents"), "<null>");
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81 | model = new ContentsModel(rootNode);
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82 | contents = new JTree((DefaultTreeModel) model);
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83 | contents.addTreeSelectionListener(new ContentsListener());
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84 | contents.setExpandsSelectedPaths(true);
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85 |
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86 | // Creation
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87 | JPanel content_pane = (JPanel) this.getContentPane();
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88 | split_pane = new JSplitPane(JSplitPane.VERTICAL_SPLIT);
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89 | JScrollPane index_scroll = new JScrollPane(contents);
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90 | JScrollPane view_scroll = new JScrollPane(view);
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91 |
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92 | // Layout
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93 | split_pane.add(index_scroll, JSplitPane.LEFT);
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94 | split_pane.add(view_scroll, JSplitPane.RIGHT);
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95 | content_pane.setLayout(new BorderLayout());
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96 | content_pane.add(split_pane, BorderLayout.CENTER);
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97 |
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98 | // Center
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99 | Dimension screen_size = Toolkit.getDefaultToolkit().getScreenSize();
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100 | setLocation((screen_size.width - SIZE.width) / 2, (screen_size.height - SIZE.height) / 2);
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101 | }
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102 |
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103 |
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104 | public void destroy()
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105 | {
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106 | view = null;
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107 | contents = null;
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108 | }
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109 |
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110 |
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111 | public void setView(String sectionName)
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112 | {
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113 | // Find the node in the tree with the specified sectionName
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114 | HelpItem node = model.getHelpItemNamed(sectionName);
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115 |
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116 | // Ensure the node is selected and visible
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117 | TreePath path = new TreePath(node.getPath());
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118 | contents.setSelectionPath(path);
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119 | contents.scrollPathToVisible(path);
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120 |
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121 | // Display the selected page
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122 | URL url = node.getURL();
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123 | if (url != null) {
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124 | view.showHTMLDocument(url);
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125 | }
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126 |
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127 | // Make the help frame visible
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128 | show();
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129 | split_pane.setDividerLocation(0.2);
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130 | }
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131 |
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132 |
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133 | private class ContentsModel
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134 | extends DefaultTreeModel {
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135 |
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136 | public ContentsModel(MutableTreeNode rootNode) {
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137 | super(rootNode);
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138 |
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139 | // Load the XML help file and build the contents structure from it
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140 | try {
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141 | DOMParser parser = new DOMParser();
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142 | parser.parse(Utility.HELP_DIR + "help.xml");
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143 | Document document = parser.getDocument();
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144 |
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145 | // Traverse the document hierarchy, building a tree representing its structure
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146 | Node documentNode = document.getFirstChild();
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147 |
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148 | int sectionNum = 0;
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149 | NodeList children = documentNode.getChildNodes();
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150 | for (int i = 0; i < children.getLength(); i++) {
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151 | Node child = children.item(i);
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152 | if (child.getNodeName().equals("Section")) {
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153 | sectionNum++;
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154 | buildContentsHierarchy(rootNode, sectionNum + "", child);
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155 | }
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156 | }
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157 | }
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158 | catch (Exception ex) {
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159 | ex.printStackTrace();
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160 | }
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161 | }
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162 |
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163 |
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164 | public void buildContentsHierarchy(MutableTreeNode parent, String pos, Node node)
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165 | {
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166 | // Determine the section name
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167 | String sectionName = ((Element) node).getAttribute("name");
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168 |
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169 | // Determine the section title
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170 | String sectionTitle = "";
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171 | NodeList children = node.getChildNodes();
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172 | for (int i = 0; i < children.getLength(); i++) {
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173 | Node child = children.item(i);
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174 | if (child.getNodeName().equals("Title")) {
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175 | sectionTitle = pos + ": " + child.getFirstChild().getNodeValue();
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176 | }
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177 | }
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178 |
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179 | // Add the node into the tree
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180 | HelpItem item = new HelpItem(sectionTitle, sectionName);
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181 | insertNodeInto(item, parent, parent.getChildCount());
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182 |
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183 | // Apply recursively to the children of this node
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184 | int sectionNum = 0;
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185 | for (int i = 0; i < children.getLength(); i++) {
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186 | Node child = children.item(i);
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187 | if (child.getNodeName().equals("Section")) {
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188 | sectionNum++;
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189 | buildContentsHierarchy(item, pos + "." + sectionNum, child);
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190 | }
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191 | }
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192 | }
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193 |
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194 |
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195 | public HelpItem getHelpItemNamed(String sectionName)
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196 | {
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197 | // Find the node with name matching sectionName, somewhere in the tree
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198 | Enumeration descendants = ((DefaultMutableTreeNode) root).preorderEnumeration();
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199 | while (descendants.hasMoreElements()) {
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200 | HelpItem node = (HelpItem) descendants.nextElement();
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201 | if (node.name.equals(sectionName)) {
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202 | return node;
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203 | }
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204 | }
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205 |
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206 | // Couldn't be found, so just return the root (Contents) node
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207 | return (HelpItem) root;
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208 | }
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209 | }
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210 |
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211 |
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212 | /** This listener is used to listen for selection changes in the contents tree, and
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213 | * to show the appropriate page as required.
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214 | */
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215 | private class ContentsListener
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216 | implements TreeSelectionListener {
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217 |
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218 | /** Any implementation of <i>TreeSelectionListener</i> must include this method so we can be informed when the tree selection changes.
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219 | * @param event A <strong>TreeSelectionEvent</strong> containing al the relevant information about the event itself.
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220 | */
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221 | public void valueChanged(TreeSelectionEvent event)
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222 | {
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223 | TreePath path = event.getPath();
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224 | HelpItem node = (HelpItem) path.getLastPathComponent();
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225 | URL url = node.getURL();
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226 | if (url != null) {
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227 | view.showHTMLDocument(url);
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228 | }
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229 | }
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230 | }
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231 |
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232 |
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233 | /** This class provides a wrapper around a <strong>DefaultMutableTreeNode</strong> which
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234 | * provides the ability to set an html page to be loaded when this node is selected.
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235 | */
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236 | private class HelpItem
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237 | extends DefaultMutableTreeNode {
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238 |
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239 | /** The unique name of the section (matches the HTML filename) */
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240 | public String name = null;
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241 | /** The title to be displayed for this tree node. */
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242 | public String title = null;
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243 |
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244 |
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245 | /** Constructor.
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246 | * @param title The title to be shown for this node as a <strong>String</strong>.
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247 | * @param name The name of the section as a <strong>String</strong>.
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248 | */
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249 | public HelpItem(String title, String name)
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250 | {
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251 | this.name = name;
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252 | this.title = title;
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253 | }
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254 |
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255 |
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256 | /** Method to create a url from the file name.
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257 | * @return A <strong>URL</strong> that points to the file's location.
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258 | */
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259 | public URL getURL()
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260 | {
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261 | if (name != null && !name.equals("<null>")) {
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262 | try {
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263 | File file = new File(Utility.HELP_DIR + name + ".htm");
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264 | return file.toURL();
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265 | }
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266 | catch (Exception e) {
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267 | }
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268 | }
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269 |
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270 | return null;
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271 | }
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272 |
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273 |
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274 | public String toString()
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275 | {
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276 | return title;
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277 | }
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278 | }
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279 |
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280 |
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281 | /**
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282 | * @author John Thompson
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283 | */
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284 | private class Observer
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285 | extends DefaultCalHTMLObserver {
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286 |
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287 | private int state = CalCons.DOC_LOADED;
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288 |
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289 | public void linkActivatedUpdate(CalHTMLPane pane, URL url, String target_frame, String j_name) {
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290 | // System.err.println("Link clicked: " + url);
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291 | }
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292 |
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293 | public void linkFocusUpdate(CalHTMLPane pane, URL url) {
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294 | }
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295 |
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296 | public void statusUpdate(CalHTMLPane pane, int state, URL url, int value, String message) {
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297 | this.state = state;
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298 | switch(state) {
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299 | case CalCons.PRE_CONNECT:
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300 | break;
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301 | case CalCons.PARSE_FAILED:
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302 | break;
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303 | case CalCons.CONNECTED:
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304 | break;
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305 | case CalCons.DOC_LENGTH:
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306 | break;
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307 | case CalCons.TITLE:
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308 | break;
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309 | case CalCons.PARSE_FAILED_POST_CONNECT:
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310 | break;
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311 | case CalCons.WAITING_FOR_IMAGES:
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312 | break;
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313 | case CalCons.DOC_LOADED:
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314 | break;
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315 | }
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316 | }
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317 | }
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318 | }
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