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.gui.help.HelpUtil.getHelpTopicUrl;
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7 | import static org.openstreetmap.josm.tools.I18n.tr;
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8 |
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9 | import java.awt.BorderLayout;
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10 | import java.awt.Dimension;
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11 | import java.awt.event.ActionEvent;
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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.IOException;
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15 | import java.io.StringReader;
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16 | import java.nio.charset.StandardCharsets;
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17 | import java.util.Locale;
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18 |
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19 | import javax.swing.AbstractAction;
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20 | import javax.swing.JButton;
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21 | import javax.swing.JFrame;
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22 | import javax.swing.JMenuItem;
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23 | import javax.swing.JOptionPane;
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24 | import javax.swing.JPanel;
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25 | import javax.swing.JScrollPane;
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26 | import javax.swing.JSeparator;
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27 | import javax.swing.JToolBar;
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28 | import javax.swing.SwingUtilities;
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29 | import javax.swing.event.ChangeEvent;
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30 | import javax.swing.event.ChangeListener;
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31 | import javax.swing.text.BadLocationException;
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32 | import javax.swing.text.Document;
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33 | import javax.swing.text.html.StyleSheet;
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34 |
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35 | import org.openstreetmap.josm.actions.JosmAction;
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36 | import org.openstreetmap.josm.data.preferences.BooleanProperty;
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37 | import org.openstreetmap.josm.gui.HelpAwareOptionPane;
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38 | import org.openstreetmap.josm.gui.MainApplication;
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39 | import org.openstreetmap.josm.gui.MainMenu;
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40 | import org.openstreetmap.josm.gui.util.WindowGeometry;
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41 | import org.openstreetmap.josm.gui.widgets.JosmEditorPane;
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42 | import org.openstreetmap.josm.gui.widgets.JosmHTMLEditorKit;
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43 | import org.openstreetmap.josm.io.CachedFile;
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44 | import org.openstreetmap.josm.tools.ImageProvider;
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45 | import org.openstreetmap.josm.tools.InputMapUtils;
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46 | import org.openstreetmap.josm.tools.LanguageInfo.LocaleType;
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47 | import org.openstreetmap.josm.tools.Logging;
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48 | import org.openstreetmap.josm.tools.OpenBrowser;
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49 |
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50 | /**
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51 | * Help browser displaying HTML pages fetched from JOSM wiki.
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52 | */
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53 | public class HelpBrowser extends JFrame implements IHelpBrowser {
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54 |
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55 | private static final BooleanProperty USE_EXTERNAL_BROWSER = new BooleanProperty("help.use-external-browser", false);
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56 |
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57 | /** the unique instance */
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58 | private static HelpBrowser instance;
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59 |
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60 | /** the menu item in the windows menu. Required to properly hide on dialog close */
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61 | private JMenuItem windowMenuItem;
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62 |
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63 | /** the help browser */
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64 | private JosmEditorPane help;
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65 |
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66 | /** the help browser history */
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67 | private transient HelpBrowserHistory history;
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68 |
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69 | /** the currently displayed URL */
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70 | private String url;
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71 |
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72 | private final transient HelpContentReader reader;
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73 |
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74 | private static final JosmAction FOCUS_ACTION = new JosmAction(tr("JOSM Help Browser"), "help", "", null, false, false) {
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75 | @Override
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76 | public void actionPerformed(ActionEvent e) {
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77 | HelpBrowser.getInstance().setVisible(true);
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78 | }
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79 | };
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80 |
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81 | /**
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82 | * Constructs a new {@code HelpBrowser}.
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83 | */
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84 | public HelpBrowser() {
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85 | reader = new HelpContentReader(HelpUtil.getWikiBaseUrl());
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86 | build();
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87 | }
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88 |
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89 | /**
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90 | * Replies the unique instance of the help browser
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91 | *
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92 | * @return the unique instance of the help browser
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93 | */
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94 | public static synchronized HelpBrowser getInstance() {
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95 | if (instance == null) {
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96 | instance = new HelpBrowser();
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97 | }
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98 | return instance;
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99 | }
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100 |
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101 | /**
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102 | * Show the help page for help topic <code>helpTopic</code>.
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103 | *
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104 | * @param helpTopic the help topic
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105 | */
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106 | public static void setUrlForHelpTopic(final String helpTopic) {
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107 | final HelpBrowser browser = getInstance();
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108 | if (Boolean.TRUE.equals(USE_EXTERNAL_BROWSER.get())) {
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109 | SwingUtilities.invokeLater(() -> {
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110 | browser.loadRelativeHelpTopic(helpTopic);
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111 | OpenBrowser.displayUrl(browser.url);
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112 | });
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113 | return;
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114 | }
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115 | SwingUtilities.invokeLater(() -> {
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116 | browser.openHelpTopic(helpTopic);
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117 | browser.setVisible(true);
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118 | browser.toFront();
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119 | });
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120 | }
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121 |
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122 | /**
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123 | * Builds the style sheet used in the internal help browser
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124 | *
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125 | * @return the style sheet
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126 | */
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127 | protected StyleSheet buildStyleSheet() {
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128 | StyleSheet ss = new StyleSheet();
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129 | final String css;
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130 | try (CachedFile cf = new CachedFile("resource://data/help-browser.css")) {
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131 | css = new String(cf.getByteContent(), StandardCharsets.ISO_8859_1);
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132 | } catch (IOException e) {
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133 | Logging.error(tr("Failed to read CSS file ''help-browser.css''. Exception is: {0}", e.toString()));
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134 | Logging.error(e);
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135 | return ss;
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136 | }
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137 | ss.addRule(css);
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138 |
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139 | // overwrite link color
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140 | String linkColor = JosmEditorPane.getLinkColor();
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141 | if (linkColor != null) {
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142 | ss.addRule("a {color: " + linkColor + "}");
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143 | }
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144 | return ss;
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145 | }
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146 |
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147 | /**
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148 | * Builds toolbar.
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149 | * @return the toolbar
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150 | */
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151 | protected JToolBar buildToolBar() {
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152 | JToolBar tb = new JToolBar();
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153 | tb.add(new JButton(new HomeAction(this)));
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154 | tb.add(new JButton(new BackAction(this)));
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155 | tb.add(new JButton(new ForwardAction(this)));
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156 | tb.add(new JButton(new ReloadAction(this)));
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157 | tb.add(new JSeparator());
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158 | tb.add(new JButton(new OpenInBrowserAction(this)));
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159 | tb.add(new JButton(new EditAction(this)));
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160 | return tb;
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161 | }
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162 |
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163 | /**
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164 | * Builds GUI.
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165 | */
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166 | protected final void build() {
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167 | help = new JosmEditorPane();
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168 | JosmHTMLEditorKit kit = new JosmHTMLEditorKit();
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169 | kit.setStyleSheet(buildStyleSheet());
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170 | help.setEditorKit(kit);
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171 | help.setEditable(false);
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172 | help.addHyperlinkListener(new HyperlinkHandler(this, help));
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173 | help.setContentType("text/html");
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174 | history = new HelpBrowserHistory(this);
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175 |
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176 | JPanel p = new JPanel(new BorderLayout());
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177 | setContentPane(p);
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178 |
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179 | p.add(new JScrollPane(help), BorderLayout.CENTER);
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180 |
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181 | addWindowListener(new WindowAdapter() {
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182 | @Override public void windowClosing(WindowEvent e) {
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183 | setVisible(false);
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184 | }
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185 | });
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186 |
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187 | p.add(buildToolBar(), BorderLayout.NORTH);
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188 | InputMapUtils.addEscapeAction(getRootPane(), new AbstractAction() {
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189 | @Override
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190 | public void actionPerformed(ActionEvent e) {
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191 | setVisible(false);
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192 | }
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193 | });
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194 |
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195 | setMinimumSize(new Dimension(400, 200));
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196 | setTitle(tr("JOSM Help Browser"));
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197 | }
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198 |
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199 | @Override
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200 | public void setVisible(boolean visible) {
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201 | if (visible) {
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202 | new WindowGeometry(
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203 | getClass().getName() + ".geometry",
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204 | WindowGeometry.centerInWindow(
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205 | getParent(),
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206 | new Dimension(600, 400)
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207 | )
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208 | ).applySafe(this);
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209 | } else if (isShowing()) { // Avoid IllegalComponentStateException like in #8775
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210 | new WindowGeometry(this).remember(getClass().getName() + ".geometry");
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211 | }
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212 | MainMenu menu = MainApplication.getMenu();
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213 | if (menu != null && menu.windowMenu != null) {
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214 | if (windowMenuItem != null && !visible) {
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215 | menu.windowMenu.remove(windowMenuItem);
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216 | windowMenuItem = null;
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217 | }
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218 | if (windowMenuItem == null && visible) {
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219 | windowMenuItem = MainMenu.add(menu.windowMenu, FOCUS_ACTION, MainMenu.WINDOW_MENU_GROUP.VOLATILE);
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220 | }
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221 | }
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222 | super.setVisible(visible);
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223 | }
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224 |
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225 | /**
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226 | * Load help topic.
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227 | * @param content topic contents
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228 | */
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229 | protected void loadTopic(String content) {
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230 | Document document = help.getEditorKit().createDefaultDocument();
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231 | try {
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232 | help.getEditorKit().read(new StringReader(content), document, 0);
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233 | } catch (IOException | BadLocationException e) {
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234 | Logging.error(e);
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235 | }
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236 | help.setDocument(document);
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237 | }
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238 |
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239 | @Override
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240 | public String getUrl() {
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241 | return url;
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242 | }
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243 |
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244 | @Override
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245 | public void setUrl(String url) {
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246 | this.url = url;
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247 | }
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248 |
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249 | /**
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250 | * Displays a warning page when a help topic doesn't exist yet.
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251 | *
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252 | * @param relativeHelpTopic the help topic
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253 | */
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254 | protected void handleMissingHelpContent(String relativeHelpTopic) {
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255 | // i18n: do not translate "warning-header" and "warning-body"
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256 | String message = tr("<html><p class=\"warning-header\">Help content for help topic missing</p>"
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257 | + "<p class=\"warning-body\">Help content for the help topic <strong>{0}</strong> is "
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258 | + "not available yet. It is missing both in your local language ({1}) and in English.<br><br>"
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259 | + "Please help to improve the JOSM help system and fill in the missing information. "
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260 | + "You can both edit the <a href=\"{2}\">help topic in your local language ({1})</a> and "
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261 | + "the <a href=\"{3}\">help topic in English</a>."
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262 | + "</p></html>",
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263 | relativeHelpTopic,
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264 | Locale.getDefault().getDisplayName(),
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265 | getHelpTopicEditUrl(buildAbsoluteHelpTopic(relativeHelpTopic, LocaleType.DEFAULT)),
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266 | getHelpTopicEditUrl(buildAbsoluteHelpTopic(relativeHelpTopic, LocaleType.ENGLISH))
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267 | );
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268 | loadTopic(message);
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269 | }
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270 |
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271 | /**
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272 | * Displays a error page if a help topic couldn't be loaded because of network or IO error.
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273 | *
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274 | * @param relativeHelpTopic the help topic
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275 | * @param e the exception
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276 | */
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277 | protected void handleHelpContentReaderException(String relativeHelpTopic, HelpContentReaderException e) {
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278 | String message = tr("<html><p class=\"error-header\">Error when retrieving help information</p>"
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279 | + "<p class=\"error-body\">The content for the help topic <strong>{0}</strong> could "
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280 | + "not be loaded. The error message is (untranslated):<br>"
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281 | + "<tt>{1}</tt>"
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282 | + "</p></html>",
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283 | relativeHelpTopic,
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284 | e.toString()
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285 | );
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286 | loadTopic(message);
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287 | }
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288 |
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289 | /**
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290 | * Loads a help topic given by a relative help topic name (i.e. "/Action/New")
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291 | *
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292 | * First tries to load the language specific help topic. If it is missing, tries to
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293 | * load the topic in English.
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294 | *
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295 | * @param relativeHelpTopic the relative help topic
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296 | */
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297 | protected void loadRelativeHelpTopic(String relativeHelpTopic) {
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298 | String url = getHelpTopicUrl(buildAbsoluteHelpTopic(relativeHelpTopic, LocaleType.DEFAULTNOTENGLISH));
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299 | String content = null;
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300 | try {
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301 | content = reader.fetchHelpTopicContent(url, true);
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302 | } catch (MissingHelpContentException e) {
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303 | Logging.trace(e);
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304 | url = getHelpTopicUrl(buildAbsoluteHelpTopic(relativeHelpTopic, LocaleType.BASELANGUAGE));
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305 | try {
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306 | content = reader.fetchHelpTopicContent(url, true);
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307 | } catch (MissingHelpContentException e1) {
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308 | Logging.trace(e1);
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309 | url = getHelpTopicUrl(buildAbsoluteHelpTopic(relativeHelpTopic, LocaleType.ENGLISH));
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310 | try {
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311 | content = reader.fetchHelpTopicContent(url, true);
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312 | } catch (MissingHelpContentException e2) {
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313 | Logging.debug(e2);
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314 | this.url = url;
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315 | handleMissingHelpContent(relativeHelpTopic);
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316 | return;
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317 | } catch (HelpContentReaderException e2) {
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318 | Logging.error(e2);
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319 | handleHelpContentReaderException(relativeHelpTopic, e2);
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320 | return;
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321 | }
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322 | } catch (HelpContentReaderException e1) {
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323 | Logging.error(e1);
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324 | handleHelpContentReaderException(relativeHelpTopic, e1);
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325 | return;
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326 | }
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327 | } catch (HelpContentReaderException e) {
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328 | Logging.error(e);
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329 | handleHelpContentReaderException(relativeHelpTopic, e);
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330 | return;
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331 | }
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332 | loadTopic(content);
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333 | history.setCurrentUrl(url);
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334 | this.url = url;
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335 | }
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336 |
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337 | /**
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338 | * Loads a help topic given by an absolute help topic name, i.e.
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339 | * "/De:Help/Action/New"
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340 | *
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341 | * @param absoluteHelpTopic the absolute help topic name
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342 | */
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343 | protected void loadAbsoluteHelpTopic(String absoluteHelpTopic) {
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344 | String url = getHelpTopicUrl(absoluteHelpTopic);
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345 | String content = null;
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346 | try {
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347 | content = reader.fetchHelpTopicContent(url, true);
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348 | } catch (MissingHelpContentException e) {
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349 | Logging.debug(e);
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350 | this.url = url;
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351 | handleMissingHelpContent(absoluteHelpTopic);
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352 | return;
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353 | } catch (HelpContentReaderException e) {
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354 | Logging.error(e);
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355 | handleHelpContentReaderException(absoluteHelpTopic, e);
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356 | return;
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357 | }
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358 | loadTopic(content);
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359 | history.setCurrentUrl(url);
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360 | this.url = url;
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361 | }
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362 |
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363 | @Override
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364 | public void openUrl(String url) {
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365 | if (!isVisible()) {
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366 | setVisible(true);
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367 | toFront();
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368 | } else {
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369 | toFront();
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370 | }
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371 | String helpTopic = HelpUtil.extractAbsoluteHelpTopic(url);
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372 | if (helpTopic == null) {
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373 | try {
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374 | this.url = url;
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375 | String content = reader.fetchHelpTopicContent(url, false);
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376 | loadTopic(content);
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377 | history.setCurrentUrl(url);
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378 | this.url = url;
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379 | } catch (HelpContentReaderException e) {
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380 | Logging.warn(e);
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381 | HelpAwareOptionPane.showOptionDialog(
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382 | MainApplication.getMainFrame(),
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383 | tr(
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384 | "<html>Failed to open help page for url {0}.<br>"
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385 | + "This is most likely due to a network problem, please check<br>"
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386 | + "your internet connection</html>",
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387 | url
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388 | ),
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389 | tr("Failed to open URL"),
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390 | JOptionPane.ERROR_MESSAGE,
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391 | null, /* no icon */
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392 | null, /* standard options, just OK button */
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393 | null, /* default is standard */
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394 | null /* no help context */
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395 | );
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396 | }
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397 | history.setCurrentUrl(url);
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398 | } else {
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399 | loadAbsoluteHelpTopic(helpTopic);
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400 | }
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401 | }
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402 |
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403 | @Override
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404 | public void openHelpTopic(String relativeHelpTopic) {
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405 | if (!isVisible()) {
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406 | setVisible(true);
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407 | toFront();
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408 | } else {
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409 | toFront();
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410 | }
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411 | loadRelativeHelpTopic(relativeHelpTopic);
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412 | }
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413 |
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414 | abstract static class AbstractBrowserAction extends AbstractAction {
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415 | protected final transient IHelpBrowser browser;
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416 |
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417 | protected AbstractBrowserAction(IHelpBrowser browser) {
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418 | this.browser = browser;
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419 | }
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420 | }
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421 |
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422 | static class OpenInBrowserAction extends AbstractBrowserAction {
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423 |
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424 | /**
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425 | * Constructs a new {@code OpenInBrowserAction}.
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426 | * @param browser help browser
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427 | */
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428 | OpenInBrowserAction(IHelpBrowser browser) {
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429 | super(browser);
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430 | putValue(SHORT_DESCRIPTION, tr("Open the current help page in an external browser"));
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431 | new ImageProvider("help", "internet").getResource().attachImageIcon(this, true);
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432 | }
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433 |
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434 | @Override
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435 | public void actionPerformed(ActionEvent e) {
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436 | OpenBrowser.displayUrl(browser.getUrl());
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437 | }
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438 | }
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439 |
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440 | static class EditAction extends AbstractBrowserAction {
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441 |
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442 | /**
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443 | * Constructs a new {@code EditAction}.
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444 | * @param browser help browser
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445 | */
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446 | EditAction(IHelpBrowser browser) {
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447 | super(browser);
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448 | putValue(SHORT_DESCRIPTION, tr("Edit the current help page"));
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449 | new ImageProvider("dialogs", "edit").getResource().attachImageIcon(this, true);
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450 | }
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451 |
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452 | @Override
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453 | public void actionPerformed(ActionEvent e) {
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454 | String url = browser.getUrl();
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455 | if (url == null)
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456 | return;
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457 | if (!url.startsWith(HelpUtil.getWikiBaseHelpUrl())) {
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458 | String message = tr(
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459 | "<html>The current URL <tt>{0}</tt><br>"
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460 | + "is an external URL. Editing is only possible for help topics<br>"
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461 | + "on the help server <tt>{1}</tt>.</html>",
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462 | url,
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463 | HelpUtil.getWikiBaseUrl()
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464 | );
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465 | JOptionPane.showMessageDialog(
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466 | MainApplication.getMainFrame(),
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467 | message,
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468 | tr("Warning"),
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469 | JOptionPane.WARNING_MESSAGE
|
---|
470 | );
|
---|
471 | return;
|
---|
472 | }
|
---|
473 | url = url.replaceAll("#[^#]*$", "");
|
---|
474 | OpenBrowser.displayUrl(url+"?action=edit");
|
---|
475 | }
|
---|
476 | }
|
---|
477 |
|
---|
478 | static class ReloadAction extends AbstractBrowserAction {
|
---|
479 |
|
---|
480 | /**
|
---|
481 | * Constructs a new {@code ReloadAction}.
|
---|
482 | * @param browser help browser
|
---|
483 | */
|
---|
484 | ReloadAction(IHelpBrowser browser) {
|
---|
485 | super(browser);
|
---|
486 | putValue(SHORT_DESCRIPTION, tr("Reload the current help page"));
|
---|
487 | new ImageProvider("dialogs", "refresh").getResource().attachImageIcon(this, true);
|
---|
488 | }
|
---|
489 |
|
---|
490 | @Override
|
---|
491 | public void actionPerformed(ActionEvent e) {
|
---|
492 | browser.openUrl(browser.getUrl());
|
---|
493 | }
|
---|
494 | }
|
---|
495 |
|
---|
496 | static class BackAction extends AbstractBrowserAction implements ChangeListener {
|
---|
497 |
|
---|
498 | /**
|
---|
499 | * Constructs a new {@code BackAction}.
|
---|
500 | * @param browser help browser
|
---|
501 | */
|
---|
502 | BackAction(IHelpBrowser browser) {
|
---|
503 | super(browser);
|
---|
504 | browser.getHistory().addChangeListener(this);
|
---|
505 | putValue(SHORT_DESCRIPTION, tr("Go to the previous page"));
|
---|
506 | new ImageProvider("dialogs", "previous").getResource().attachImageIcon(this, true);
|
---|
507 | setEnabled(browser.getHistory().canGoBack());
|
---|
508 | }
|
---|
509 |
|
---|
510 | @Override
|
---|
511 | public void actionPerformed(ActionEvent e) {
|
---|
512 | browser.getHistory().back();
|
---|
513 | }
|
---|
514 |
|
---|
515 | @Override
|
---|
516 | public void stateChanged(ChangeEvent e) {
|
---|
517 | setEnabled(browser.getHistory().canGoBack());
|
---|
518 | }
|
---|
519 | }
|
---|
520 |
|
---|
521 | static class ForwardAction extends AbstractBrowserAction implements ChangeListener {
|
---|
522 |
|
---|
523 | /**
|
---|
524 | * Constructs a new {@code ForwardAction}.
|
---|
525 | * @param browser help browser
|
---|
526 | */
|
---|
527 | ForwardAction(IHelpBrowser browser) {
|
---|
528 | super(browser);
|
---|
529 | browser.getHistory().addChangeListener(this);
|
---|
530 | putValue(SHORT_DESCRIPTION, tr("Go to the next page"));
|
---|
531 | new ImageProvider("dialogs", "next").getResource().attachImageIcon(this, true);
|
---|
532 | setEnabled(browser.getHistory().canGoForward());
|
---|
533 | }
|
---|
534 |
|
---|
535 | @Override
|
---|
536 | public void actionPerformed(ActionEvent e) {
|
---|
537 | browser.getHistory().forward();
|
---|
538 | }
|
---|
539 |
|
---|
540 | @Override
|
---|
541 | public void stateChanged(ChangeEvent e) {
|
---|
542 | setEnabled(browser.getHistory().canGoForward());
|
---|
543 | }
|
---|
544 | }
|
---|
545 |
|
---|
546 | static class HomeAction extends AbstractBrowserAction {
|
---|
547 |
|
---|
548 | /**
|
---|
549 | * Constructs a new {@code HomeAction}.
|
---|
550 | * @param browser help browser
|
---|
551 | */
|
---|
552 | HomeAction(IHelpBrowser browser) {
|
---|
553 | super(browser);
|
---|
554 | putValue(SHORT_DESCRIPTION, tr("Go to the JOSM help home page"));
|
---|
555 | new ImageProvider("help", "home").getResource().attachImageIcon(this, true);
|
---|
556 | }
|
---|
557 |
|
---|
558 | @Override
|
---|
559 | public void actionPerformed(ActionEvent e) {
|
---|
560 | browser.openHelpTopic("/");
|
---|
561 | }
|
---|
562 | }
|
---|
563 |
|
---|
564 | @Override
|
---|
565 | public HelpBrowserHistory getHistory() {
|
---|
566 | return history;
|
---|
567 | }
|
---|
568 | }
|
---|