| 1 | // License: GPL. Copyright 2007 by Immanuel Scholz and others
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| 2 | package org.openstreetmap.josm.actions;
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| 3 |
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| 4 | import static org.openstreetmap.josm.tools.I18n.tr;
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| 5 |
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| 6 | import java.awt.BorderLayout;
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| 7 | import java.awt.Component;
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| 8 | import java.awt.Point;
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| 9 | import java.awt.event.ActionEvent;
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| 10 | import java.awt.event.KeyEvent;
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| 11 | import java.awt.event.WindowAdapter;
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| 12 | import java.awt.event.WindowEvent;
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| 13 | import java.io.IOException;
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| 14 |
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| 15 | import javax.swing.AbstractAction;
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| 16 | import javax.swing.AbstractButton;
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| 17 | import javax.swing.Action;
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| 18 | import javax.swing.JButton;
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| 19 | import javax.swing.JComponent;
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| 20 | import javax.swing.JEditorPane;
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| 21 | import javax.swing.JFrame;
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| 22 | import javax.swing.JMenu;
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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.KeyStroke;
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| 27 | import javax.swing.SwingUtilities;
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| 28 | import javax.swing.event.HyperlinkEvent;
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| 29 | import javax.swing.event.HyperlinkListener;
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| 30 |
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| 31 | import org.openstreetmap.josm.Main;
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| 32 | import org.openstreetmap.josm.tools.ImageProvider;
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| 33 | import org.openstreetmap.josm.tools.LanguageInfo;
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| 34 | import org.openstreetmap.josm.tools.OpenBrowser;
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| 35 | import org.openstreetmap.josm.tools.WikiReader;
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| 36 |
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| 37 | /**
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| 38 | * Open a help browser and displays lightweight online help.
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| 39 | *
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| 40 | * @author imi
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| 41 | */
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| 42 | public class HelpAction extends AbstractAction {
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| 43 |
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| 44 | public interface Helpful {
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| 45 | String helpTopic();
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| 46 | }
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| 47 |
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| 48 | private String languageCode = LanguageInfo.getLanguageCodeWiki();
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| 49 | private JFrame helpBrowser = new JFrame(tr("JOSM Online Help"));
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| 50 | private String baseurl = Main.pref.get("help.baseurl", "http://josm.openstreetmap.de");
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| 51 | private String pathbase = Main.pref.get("help.pathbase", "/wiki/");
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| 52 | private String pathhelp = Main.pref.get("help.pathhelp", "Help/");
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| 53 | private String pathmenu = Main.pref.get("help.pathmenu", "Menu/");
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| 54 | private JEditorPane help = new JEditorPane();
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| 55 | private WikiReader reader = new WikiReader(baseurl);
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| 56 | private String url;
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| 57 |
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| 58 | public HelpAction() {
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| 59 | super(tr("Help"), ImageProvider.get("help"));
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| 60 | help.setEditable(false);
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| 61 | help.addHyperlinkListener(new HyperlinkListener(){
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| 62 | public void hyperlinkUpdate(HyperlinkEvent e) {
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| 63 | if (e.getEventType() != HyperlinkEvent.EventType.ACTIVATED)
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| 64 | return;
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| 65 | if (e.getURL() == null) {
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| 66 | help.setText("<html>404 not found</html>");
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| 67 | } else if (e.getURL().toString().endsWith("action=edit")) {
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| 68 | OpenBrowser.displayUrl(e.getURL().toString());
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| 69 | } else {
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| 70 | setHelpUrl(e.getURL().toString());
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| 71 | }
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| 72 | }
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| 73 | });
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| 74 | help.setContentType("text/html");
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| 75 |
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| 76 | JPanel p = new JPanel(new BorderLayout());
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| 77 | helpBrowser.setContentPane(p);
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| 78 |
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| 79 | p.add(new JScrollPane(help), BorderLayout.CENTER);
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| 80 | String[] bounds = Main.pref.get("help.window.bounds", "0,0,800,600").split(",");
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| 81 | helpBrowser.setBounds(
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| 82 | Integer.parseInt(bounds[0]),
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| 83 | Integer.parseInt(bounds[1]),
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| 84 | Integer.parseInt(bounds[2]),
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| 85 | Integer.parseInt(bounds[3]));
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| 86 |
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| 87 | JPanel buttons = new JPanel();
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| 88 | p.add(buttons, BorderLayout.SOUTH);
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| 89 | createButton(buttons, tr("Open in Browser"));
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| 90 | createButton(buttons, tr("Edit"));
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| 91 | createButton(buttons, tr("Reload"));
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| 92 |
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| 93 | helpBrowser.addWindowListener(new WindowAdapter(){
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| 94 | @Override public void windowClosing(WindowEvent e) {
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| 95 | closeHelp();
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| 96 | }
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| 97 | });
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| 98 |
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| 99 | help.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put(KeyStroke.getKeyStroke(KeyEvent.VK_ESCAPE, 0), "Close");
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| 100 | help.getActionMap().put("Close", new AbstractAction(){
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| 101 | public void actionPerformed(ActionEvent e) {
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| 102 | closeHelp();
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| 103 | }
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| 104 | });
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| 105 | }
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| 106 |
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| 107 | public void actionPerformed(ActionEvent e) {
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| 108 | if (tr("Open in Browser").equals(e.getActionCommand())) {
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| 109 | OpenBrowser.displayUrl(url);
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| 110 | } else if (tr("Edit").equals(e.getActionCommand())) {
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| 111 | if (!url.startsWith(baseurl)) {
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| 112 | JOptionPane.showMessageDialog(
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| 113 | Main.parent,
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| 114 | tr("Can only edit help pages from JOSM Online Help"),
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| 115 | tr("Warning"),
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| 116 | JOptionPane.WARNING_MESSAGE
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| 117 | );
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| 118 | return;
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| 119 | }
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| 120 | OpenBrowser.displayUrl(url+"?action=edit");
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| 121 | } else if (tr("Reload").equals(e.getActionCommand())) {
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| 122 | setHelpUrl(url);
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| 123 | } else if (e.getActionCommand() == null) {
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| 124 | String topic = null;
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| 125 | Point mouse = Main.parent.getMousePosition();
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| 126 | if (mouse != null) {
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| 127 | topic = contextSensitiveHelp(SwingUtilities.getDeepestComponentAt(Main.parent, mouse.x, mouse.y));
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| 128 | }
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| 129 | if (topic == null) {
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| 130 | helpBrowser.setVisible(false);
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| 131 | setHelpUrl(baseurl+pathbase+"Help");
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| 132 | } else {
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| 133 | help(topic);
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| 134 | }
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| 135 | } else {
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| 136 | helpBrowser.setVisible(false);
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| 137 | setHelpUrl(baseurl+pathbase+"Help");
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| 138 | }
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| 139 | }
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| 140 |
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| 141 | /**
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| 142 | * @return The topic of the help. <code>null</code> for "don't know"
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| 143 | */
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| 144 | private String contextSensitiveHelp(Object c) {
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| 145 | if (c instanceof Helpful)
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| 146 | return ((Helpful)c).helpTopic();
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| 147 | if (c instanceof JMenu) {
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| 148 | JMenu b = (JMenu)c;
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| 149 | if (b.getClientProperty("help") != null)
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| 150 | return (String)b.getClientProperty("help");
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| 151 | return pathmenu+b.getText();
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| 152 | }
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| 153 | if (c instanceof AbstractButton) {
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| 154 | AbstractButton b = (AbstractButton)c;
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| 155 | if (b.getClientProperty("help") != null)
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| 156 | return (String)b.getClientProperty("help");
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| 157 | return contextSensitiveHelp(((AbstractButton)c).getAction());
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| 158 | }
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| 159 | if (c instanceof Action)
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| 160 | return (String)((Action)c).getValue("help");
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| 161 | if (c instanceof Component)
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| 162 | return contextSensitiveHelp(((Component)c).getParent());
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| 163 | return null;
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| 164 | }
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| 165 |
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| 166 | /**
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| 167 | * Displays the help (or browse on the already open help) on the online page
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| 168 | * with the given help topic. Use this for larger help descriptions.
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| 169 | */
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| 170 | public void help(String topic) {
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| 171 | helpBrowser.setVisible(false);
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| 172 | setHelpUrl(baseurl+pathbase+pathhelp+topic);
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| 173 | }
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| 174 |
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| 175 | /**
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| 176 | * Set the content of the help window to a specific text (in html format)
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| 177 | * @param url The url this content is the representation of
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| 178 | */
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| 179 | public void setHelpUrl(String url) {
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| 180 | String langurl = url;
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| 181 | if(url.startsWith(baseurl+pathbase))
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| 182 | {
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| 183 | int i = pathbase.length()+baseurl.length();
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| 184 | String title = url.substring(i);
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| 185 | if(languageCode.length() != 0 && !title.startsWith(languageCode)) {
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| 186 | title = languageCode + title;
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| 187 | }
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| 188 | langurl = url.substring(0, i) + title;
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| 189 | }
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| 190 | boolean loaded = false;
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| 191 | if(!langurl.equals(this.url) && !langurl.equals(url))
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| 192 | {
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| 193 | loaded = loadHelpUrl(url, langurl, true);
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| 194 | }
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| 195 | if(!loaded) {
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| 196 | loaded = loadHelpUrl(url, langurl, false);
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| 197 | }
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| 198 | if(!loaded) {
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| 199 | help.setText(tr("Error while loading page {0}",url));
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| 200 | }
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| 201 | helpBrowser.setVisible(true);
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| 202 | }
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| 203 |
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| 204 | private boolean loadHelpUrl(String url, String langurl, boolean lang)
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| 205 | {
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| 206 | this.url = lang ? langurl : url;
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| 207 | boolean loaded = false;
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| 208 | try {
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| 209 | String txt = reader.read(this.url);
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| 210 | if(txt.length() == 0)
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| 211 | {
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| 212 | if(lang)
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| 213 | throw new IOException();
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| 214 | else
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| 215 | {
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| 216 | if(url.equals(langurl))
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| 217 | {
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| 218 | txt = ("<HTML>"+tr("Help page missing. Create it in <A HREF=\"{0}\">English</A>.",
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| 219 | url+"?action=edit")+"</HTML>");
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| 220 | }
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| 221 | else
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| 222 | {
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| 223 | txt = ("<HTML>"+tr("Help page missing. Create it in <A HREF=\"{0}\">English</A> or <A HREF=\"{1}\">your language</A>.",
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| 224 | url+"?action=edit", langurl+"?action=edit")+"</HTML>");
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| 225 | }
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| 226 | }
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| 227 | }
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| 228 | help.setText(txt);
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| 229 | help.setCaretPosition(0);
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| 230 | loaded = true;
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| 231 | } catch (IOException ex) {
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| 232 | }
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| 233 | return loaded;
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| 234 | }
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| 235 |
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| 236 | /**
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| 237 | * Closes the help window
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| 238 | */
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| 239 | public void closeHelp() {
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| 240 | String bounds = helpBrowser.getX()+","+helpBrowser.getY()+","+helpBrowser.getWidth()+","+helpBrowser.getHeight();
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| 241 | Main.pref.put("help.window.bounds", bounds);
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| 242 | helpBrowser.setVisible(false);
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| 243 | }
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| 244 |
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| 245 | private void createButton(JPanel buttons, String name) {
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| 246 | JButton b = new JButton(tr(name));
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| 247 | b.setActionCommand(name);
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| 248 | b.addActionListener(this);
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| 249 | buttons.add(b);
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| 250 | }
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| 251 | }
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