1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.gui.help;
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3 |
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4 | import static org.openstreetmap.josm.gui.help.HelpUtil.buildAbsoluteHelpTopic;
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5 | import static org.openstreetmap.josm.gui.help.HelpUtil.getHelpTopicEditUrl;
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6 | import static org.openstreetmap.josm.tools.I18n.tr;
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7 |
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8 | import java.awt.BorderLayout;
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9 | import java.awt.Rectangle;
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10 | import java.awt.event.ActionEvent;
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11 | import java.awt.event.KeyEvent;
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12 | import java.awt.event.WindowAdapter;
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13 | import java.awt.event.WindowEvent;
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14 | import java.io.BufferedReader;
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15 | import java.io.IOException;
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16 | import java.io.InputStreamReader;
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17 | import java.util.Locale;
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18 | import java.util.Observable;
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19 | import java.util.Observer;
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20 | import java.util.logging.Logger;
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21 |
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22 | import javax.swing.AbstractAction;
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23 | import javax.swing.JButton;
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24 | import javax.swing.JComponent;
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25 | import javax.swing.JEditorPane;
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26 | import javax.swing.JFrame;
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27 | import javax.swing.JOptionPane;
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28 | import javax.swing.JPanel;
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29 | import javax.swing.JScrollBar;
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30 | import javax.swing.JScrollPane;
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31 | import javax.swing.JSeparator;
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32 | import javax.swing.JToolBar;
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33 | import javax.swing.KeyStroke;
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34 | import javax.swing.event.HyperlinkEvent;
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35 | import javax.swing.event.HyperlinkListener;
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36 | import javax.swing.text.AttributeSet;
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37 | import javax.swing.text.BadLocationException;
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38 | import javax.swing.text.Document;
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39 | import javax.swing.text.Element;
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40 | import javax.swing.text.SimpleAttributeSet;
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41 | import javax.swing.text.html.HTMLDocument;
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42 | import javax.swing.text.html.HTMLEditorKit;
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43 | import javax.swing.text.html.StyleSheet;
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44 | import javax.swing.text.html.HTML.Tag;
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45 |
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46 | import org.openstreetmap.josm.Main;
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47 | import org.openstreetmap.josm.gui.HelpAwareOptionPane;
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48 | import org.openstreetmap.josm.tools.ImageProvider;
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49 | import org.openstreetmap.josm.tools.OpenBrowser;
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50 |
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51 | public class HelpBrowser extends JFrame {
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52 | static private final Logger logger = Logger.getLogger(HelpBrowser.class.getName());
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53 |
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54 | /** the unique instance */
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55 | private static HelpBrowser instance;
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56 |
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57 | /**
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58 | * Replies the unique instance of the help browser
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59 | *
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60 | * @return the unique instance of the help browser
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61 | */
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62 | static public HelpBrowser getInstance() {
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63 | if (instance == null) {
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64 | instance = new HelpBrowser();
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65 | }
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66 | return instance;
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67 | }
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68 |
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69 | /**
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70 | * Launches the internal help browser and directs it to the help page for
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71 | * <code>helpTopic</code>.
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72 | *
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73 | * @param helpTopic the help topic
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74 | */
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75 | static public void launchBrowser(String helpTopic) {
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76 | HelpBrowser browser = getInstance();
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77 | browser.openHelpTopic(helpTopic);
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78 | browser.setVisible(true);
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79 | browser.toFront();
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80 | }
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81 |
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82 | /** the help browser */
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83 | private JEditorPane help;
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84 | private JScrollPane spHelp;
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85 |
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86 | /** the help browser history */
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87 | private HelpBrowserHistory history;
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88 |
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89 | /** the currently displayed URL */
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90 | private String url;
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91 |
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92 | private HelpContentReader reader;
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93 |
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94 | /**
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95 | * Builds the style sheet used in the internal help browser
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96 | *
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97 | * @return the style sheet
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98 | */
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99 | protected StyleSheet buildStyleSheet() {
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100 | StyleSheet ss = new StyleSheet();
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101 | BufferedReader reader = new BufferedReader(
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102 | new InputStreamReader(
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103 | getClass().getResourceAsStream("help-browser.css")
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104 | )
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105 | );
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106 | StringBuffer css = new StringBuffer();
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107 | try {
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108 | String line = null;
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109 | while ((line = reader.readLine()) != null) {
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110 | css.append(line);
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111 | css.append("\n");
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112 | }
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113 | reader.close();
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114 | } catch(Exception e) {
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115 | System.err.println(tr("Failed to read CSS file ''help-browser.css''. Exception is: {0}", e.toString()));
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116 | e.printStackTrace();
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117 | return ss;
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118 | }
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119 | ss.addRule(css.toString());
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120 | return ss;
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121 | }
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122 |
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123 | protected JToolBar buildToolBar() {
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124 | JToolBar tb = new JToolBar();
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125 | tb.add(new JButton(new HomeAction()));
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126 | tb.add(new JButton(new BackAction(history)));
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127 | tb.add(new JButton(new ForwardAction(history)));
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128 | tb.add(new JButton(new ReloadAction()));
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129 | tb.add(new JSeparator());
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130 | tb.add(new JButton(new OpenInBrowserAction()));
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131 | tb.add(new JButton(new EditAction()));
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132 | return tb;
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133 | }
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134 |
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135 | protected void build() {
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136 | help = new JEditorPane();
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137 | HTMLEditorKit kit = new HTMLEditorKit();
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138 | kit.setStyleSheet(buildStyleSheet());
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139 | help.setEditorKit(kit);
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140 | help.setEditable(false);
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141 | help.addHyperlinkListener(new HyperlinkHandler());
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142 | help.setContentType("text/html");
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143 | history = new HelpBrowserHistory(this);
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144 |
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145 | JPanel p = new JPanel(new BorderLayout());
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146 | setContentPane(p);
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147 |
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148 | p.add(spHelp = new JScrollPane(help), BorderLayout.CENTER);
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149 |
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150 | addWindowListener(new WindowAdapter(){
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151 | @Override public void windowClosing(WindowEvent e) {
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152 | setVisible(false);
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153 | }
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154 | });
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155 |
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156 | p.add(buildToolBar(), BorderLayout.NORTH);
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157 | help.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put(KeyStroke.getKeyStroke(KeyEvent.VK_ESCAPE, 0), "Close");
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158 | help.getActionMap().put("Close", new AbstractAction(){
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159 | public void actionPerformed(ActionEvent e) {
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160 | setVisible(false);
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161 | }
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162 | });
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163 |
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164 | setTitle(tr("JOSM Help Browser"));
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165 | }
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166 |
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167 | public HelpBrowser() {
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168 | reader = new HelpContentReader(HelpUtil.getWikiBaseUrl());
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169 | build();
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170 | }
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171 |
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172 | /**
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173 | * Replies the current URL
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174 | *
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175 | * @return the current URL
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176 | */
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177 |
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178 | public String getUrl() {
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179 | return url;
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180 | }
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181 |
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182 | /**
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183 | * Displays a warning page when a help topic doesn't exist yet.
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184 | *
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185 | * @param relativeHelpTopic the help topic
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186 | */
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187 | protected void handleMissingHelpContent(String relativeHelpTopic) {
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188 | String message = tr("<html><p class=\"warning-header\">Help content for help topic missing</p>"
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189 | + "<p class=\"warning-body\">Help content for the help topic <strong>{0}</strong> is "
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190 | + "not available yet. It is missing both in your local language ({1}) and in english.<br><br>"
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191 | + "Please help to improve the JOSM help system and fill in the missing information."
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192 | + "You can both edit the <a href=\"{2}\">help topic in your local language ({1})</a> and "
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193 | + "the <a href=\"{3}\">help topic in english</a>."
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194 | + "</p></html>",
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195 | relativeHelpTopic,
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196 | Locale.getDefault().getDisplayName(),
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197 | getHelpTopicEditUrl(buildAbsoluteHelpTopic(relativeHelpTopic)),
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198 | getHelpTopicEditUrl(buildAbsoluteHelpTopic(relativeHelpTopic, Locale.ENGLISH))
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199 | );
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200 | help.setText(message);
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201 | }
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202 |
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203 | /**
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204 | * Displays a error page if a help topic couldn't be loaded because of network or IO error.
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205 | *
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206 | * @param relativeHelpTopic the help topic
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207 | * @param e the exception
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208 | */
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209 | protected void handleHelpContentReaderException(String relativeHelpTopic, HelpContentReaderException e) {
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210 | String message = tr("<html><p class=\"error-header\">Error when retrieving help information</p>"
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211 | + "<p class=\"error-body\">The content for the help topic <strong>{0}</strong> could "
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212 | + "not be loaded. The error message is (untranslated):<br>"
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213 | + "<tt>{1}</tt>"
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214 | + "</p></html>",
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215 | relativeHelpTopic,
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216 | e.toString()
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217 | );
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218 | help.setText(message);
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219 | }
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220 |
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221 | protected void scrollToTop() {
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222 | JScrollBar sb = spHelp.getVerticalScrollBar();
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223 | sb.setValue(sb.getMinimum());
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224 | }
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225 |
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226 | /**
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227 | * Loads a help topic given by a relative help topic name (i.e. "/Action/New")
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228 | *
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229 | * First tries to load the language specific help topic. If it is missing, tries to
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230 | * load the topic in english.
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231 | *
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232 | * @param relativeHelpTopic the relative help topic
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233 | */
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234 | protected void loadRelativeHelpTopic(String relativeHelpTopic) {
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235 | String url = HelpUtil.getHelpTopicUrl(HelpUtil.buildAbsoluteHelpTopic(relativeHelpTopic));
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236 | String content = null;
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237 | try {
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238 | content = reader.fetchHelpTopicContent(url);
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239 | } catch(MissingHelpContentException e) {
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240 | url = HelpUtil.getHelpTopicUrl(HelpUtil.buildAbsoluteHelpTopic(relativeHelpTopic, Locale.ENGLISH));
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241 | try {
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242 | logger.info("fetching url: " + url);
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243 | content = reader.fetchHelpTopicContent(url);
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244 | } catch(MissingHelpContentException e1) {
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245 | handleMissingHelpContent(relativeHelpTopic);
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246 | return;
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247 | } catch(HelpContentReaderException e1) {
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248 | e1.printStackTrace();
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249 | handleHelpContentReaderException(relativeHelpTopic,e1);
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250 | return;
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251 | }
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252 | } catch(HelpContentReaderException e) {
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253 | e.printStackTrace();
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254 | handleHelpContentReaderException(relativeHelpTopic, e);
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255 | return;
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256 | }
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257 | help.setText(content);
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258 | history.setCurrentUrl(url);
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259 | this.url = url;
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260 | scrollToTop();
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261 | }
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262 |
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263 | /**
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264 | * Loads a help topic given by an absolute help topic name, i.e.
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265 | * "/De:Help/Action/New"
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266 | *
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267 | * @param absoluteHelpTopic the absolute help topic name
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268 | */
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269 | protected void loadAbsoluteHelpTopic(String absoluteHelpTopic) {
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270 | String url = HelpUtil.getHelpTopicUrl(absoluteHelpTopic);
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271 | String content = null;
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272 | try {
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273 | content = reader.fetchHelpTopicContent(url);
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274 | } catch(MissingHelpContentException e) {
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275 | handleMissingHelpContent(absoluteHelpTopic);
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276 | return;
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277 | } catch(HelpContentReaderException e) {
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278 | e.printStackTrace();
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279 | handleHelpContentReaderException(absoluteHelpTopic, e);
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280 | return;
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281 | }
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282 | help.setText(content);
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283 | history.setCurrentUrl(url);
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284 | this.url = url;
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285 | scrollToTop();
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286 | }
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287 |
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288 | /**
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289 | * Opens an URL and displays the content.
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290 | *
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291 | * If the URL is the locator of an absolute help topic, help content is loaded from
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292 | * the JOSM wiki. Otherwise, the help browser loads the page from the given URL
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293 | *
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294 | * @param url the url
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295 | */
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296 | public void openUrl(String url) {
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297 | if (!isVisible()) {
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298 | setVisible(true);
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299 | toFront();
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300 | } else {
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301 | toFront();
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302 | }
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303 | String helpTopic = HelpUtil.extractAbsoluteHelpTopic(url);
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304 | if (helpTopic == null) {
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305 | try {
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306 | this.url = url;
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307 | help.setPage(url);
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308 | } catch(IOException e) {
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309 | HelpAwareOptionPane.showOptionDialog(
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310 | Main.parent,
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311 | tr(
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312 | "<html>Failed to open help page for url {0}.<br>"
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313 | + "This is most likely due to a network problem, please check your<br>"
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314 | + "your internet connection</html>",
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315 | url.toString()
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316 | ),
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317 | tr("Failed to open URL"),
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318 | JOptionPane.ERROR_MESSAGE,
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319 | null, /* no icon */
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320 | null, /* standard options, just OK button */
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321 | null, /* default is standard */
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322 | null /* no help context */
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323 | );
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324 | }
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325 | history.setCurrentUrl(url);
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326 | } else {
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327 | loadAbsoluteHelpTopic(helpTopic);
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328 | }
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329 | }
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330 |
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331 | /**
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332 | * Loads and displays the help information for a help topic given
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333 | * by a relative help topic name, i.e. "/Action/New"
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334 | *
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335 | * @param relativeHelpTopic the relative help topic
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336 | */
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337 | public void openHelpTopic(String relativeHelpTopic) {
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338 | if (!isVisible()) {
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339 | setVisible(true);
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340 | toFront();
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341 | } else {
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342 | toFront();
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343 | }
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344 | loadRelativeHelpTopic(relativeHelpTopic);
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345 | }
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346 |
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347 | class OpenInBrowserAction extends AbstractAction {
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348 | public OpenInBrowserAction() {
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349 | //putValue(NAME, tr("Open in Browser"));
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350 | putValue(SHORT_DESCRIPTION, tr("Open the current help page in an external browser"));
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351 | putValue(SMALL_ICON, ImageProvider.get("help", "internet"));
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352 | }
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353 |
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354 | public void actionPerformed(ActionEvent e) {
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355 | OpenBrowser.displayUrl(getUrl());
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356 | }
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357 | }
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358 |
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359 | class EditAction extends AbstractAction {
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360 | public EditAction() {
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361 | // putValue(NAME, tr("Edit"));
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362 | putValue(SHORT_DESCRIPTION, tr("Edit the current help page"));
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363 | putValue(SMALL_ICON,ImageProvider.get("dialogs", "edit"));
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364 | }
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365 |
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366 | public void actionPerformed(ActionEvent e) {
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367 | if (!getUrl().startsWith(HelpUtil.getWikiBaseHelpUrl())) {
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368 | String message = tr(
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369 | "<html>The current URL <tt>{0}</tt><br>"
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370 | + "is an external URL. Editing is only possible for help topics<br>"
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371 | + "on the help server <tt>{1}</tt>.</html>",
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372 | getUrl(),
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373 | HelpUtil.getWikiBaseUrl()
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374 | );
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375 | JOptionPane.showMessageDialog(
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376 | Main.parent,
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377 | message,
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378 | tr("Warning"),
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379 | JOptionPane.WARNING_MESSAGE
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380 | );
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381 | return;
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382 | }
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383 | String url = getUrl();
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384 | url = url.replaceAll("#[^#]*$", "");
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385 | OpenBrowser.displayUrl(url+"?action=edit");
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386 | }
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387 | }
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388 |
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389 | class ReloadAction extends AbstractAction {
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390 | public ReloadAction() {
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391 | //putValue(NAME, tr("Reload"));
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392 | putValue(SHORT_DESCRIPTION, tr("Reload the current help page"));
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393 | putValue(SMALL_ICON, ImageProvider.get("dialogs", "refresh"));
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394 | }
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395 |
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396 | public void actionPerformed(ActionEvent e) {
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397 | openUrl(getUrl());
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398 | }
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399 | }
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400 |
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401 | static class BackAction extends AbstractAction implements Observer {
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402 | private HelpBrowserHistory history;
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403 | public BackAction(HelpBrowserHistory history) {
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404 | this.history = history;
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405 | history.addObserver(this);
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406 | //putValue(NAME, tr("Back"));
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407 | putValue(SHORT_DESCRIPTION, tr("Go to the previous page"));
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408 | putValue(SMALL_ICON, ImageProvider.get("help", "previous"));
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409 | setEnabled(history.canGoBack());
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410 | }
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411 |
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412 | public void actionPerformed(ActionEvent e) {
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413 | history.back();
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414 | }
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415 | public void update(Observable o, Object arg) {
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416 | System.out.println("BackAction: canGoBoack=" + history.canGoBack() );
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417 | setEnabled(history.canGoBack());
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418 | }
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419 | }
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420 |
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421 | static class ForwardAction extends AbstractAction implements Observer {
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422 | private HelpBrowserHistory history;
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423 | public ForwardAction(HelpBrowserHistory history) {
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424 | this.history = history;
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425 | history.addObserver(this);
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426 | //putValue(NAME, tr("Forward"));
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427 | putValue(SHORT_DESCRIPTION, tr("Go to the next page"));
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428 | putValue(SMALL_ICON, ImageProvider.get("help", "next"));
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429 | setEnabled(history.canGoForward());
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430 | }
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431 |
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432 | public void actionPerformed(ActionEvent e) {
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433 | history.forward();
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434 | }
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435 | public void update(Observable o, Object arg) {
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436 | setEnabled(history.canGoForward());
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437 | }
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438 | }
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439 |
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440 | class HomeAction extends AbstractAction {
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441 | public HomeAction() {
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442 | //putValue(NAME, tr("Home"));
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443 | putValue(SHORT_DESCRIPTION, tr("Go to the JOSM help home page"));
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444 | putValue(SMALL_ICON, ImageProvider.get("help", "home"));
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445 | }
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446 |
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447 | public void actionPerformed(ActionEvent e) {
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448 | openHelpTopic("/");
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449 | }
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450 | }
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451 |
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452 | class HyperlinkHandler implements HyperlinkListener {
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453 |
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454 | /**
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455 | * Scrolls the help browser to the element with id <code>id</code>
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456 | *
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457 | * @param id the id
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458 | * @return true, if an element with this id was found and scrolling was successful; false, otherwise
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459 | */
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460 | protected boolean scrollToElementWithId(String id) {
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461 | Document d = help.getDocument();
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462 | if (d instanceof HTMLDocument) {
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463 | HTMLDocument doc = (HTMLDocument) d;
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464 | Element element = doc.getElement(id);
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465 | try {
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466 | Rectangle r = help.modelToView(element.getStartOffset());
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467 | if (r != null) {
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468 | Rectangle vis = help.getVisibleRect();
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469 | r.height = vis.height;
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470 | help.scrollRectToVisible(r);
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471 | return true;
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472 | }
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473 | } catch(BadLocationException e) {
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474 | System.err.println(tr("Warning: bad location in HTML document. Exception was: " + e.toString()));
|
---|
475 | e.printStackTrace();
|
---|
476 | }
|
---|
477 | }
|
---|
478 | return false;
|
---|
479 | }
|
---|
480 |
|
---|
481 | /**
|
---|
482 | * Checks whether the hyperlink event originated on a <a ...> element with
|
---|
483 | * a relative href consisting of a URL fragment only, i.e.
|
---|
484 | * <a href="#thisIsALocalFragment">. If so, replies the fragment, i.e.
|
---|
485 | * "thisIsALocalFragment".
|
---|
486 | *
|
---|
487 | * Otherwise, replies null
|
---|
488 | *
|
---|
489 | * @param e the hyperlink event
|
---|
490 | * @return the local fragment
|
---|
491 | */
|
---|
492 | protected String getUrlFragment(HyperlinkEvent e) {
|
---|
493 | AttributeSet set = e.getSourceElement().getAttributes();
|
---|
494 | Object value = set.getAttribute(Tag.A);
|
---|
495 | if (value == null || ! (value instanceof SimpleAttributeSet)) return null;
|
---|
496 | SimpleAttributeSet atts = (SimpleAttributeSet)value;
|
---|
497 | value = atts.getAttribute(javax.swing.text.html.HTML.Attribute.HREF);
|
---|
498 | if (value == null) return null;
|
---|
499 | String s = (String)value;
|
---|
500 | if (s.matches("#.*"))
|
---|
501 | return s.substring(1);
|
---|
502 | return null;
|
---|
503 | }
|
---|
504 |
|
---|
505 | public void hyperlinkUpdate(HyperlinkEvent e) {
|
---|
506 | if (e.getEventType() != HyperlinkEvent.EventType.ACTIVATED)
|
---|
507 | return;
|
---|
508 | if (e.getURL() == null) {
|
---|
509 | // Probably hyperlink event on a an A-element with a href consisting of
|
---|
510 | // a fragment only, i.e. "#ALocalFragment".
|
---|
511 | //
|
---|
512 | String fragment = getUrlFragment(e);
|
---|
513 | if (fragment != null) {
|
---|
514 | // first try to scroll to an element with id==fragment. This is the way
|
---|
515 | // table of contents are built in the JOSM wiki. If this fails, try to
|
---|
516 | // scroll to a <A name="..."> element.
|
---|
517 | //
|
---|
518 | if (!scrollToElementWithId(fragment)) {
|
---|
519 | help.scrollToReference(fragment);
|
---|
520 | }
|
---|
521 | } else {
|
---|
522 | HelpAwareOptionPane.showOptionDialog(
|
---|
523 | Main.parent,
|
---|
524 | tr("Failed to open help page. The target URL is empty."),
|
---|
525 | tr("Failed to open help page"),
|
---|
526 | JOptionPane.ERROR_MESSAGE,
|
---|
527 | null, /* no icon */
|
---|
528 | null, /* standard options, just OK button */
|
---|
529 | null, /* default is standard */
|
---|
530 | null /* no help context */
|
---|
531 | );
|
---|
532 | }
|
---|
533 | } else if (e.getURL().toString().endsWith("action=edit")) {
|
---|
534 | OpenBrowser.displayUrl(e.getURL().toString());
|
---|
535 | } else {
|
---|
536 | url = e.getURL().toString();
|
---|
537 | openUrl(e.getURL().toString());
|
---|
538 | }
|
---|
539 | }
|
---|
540 | }
|
---|
541 | }
|
---|