public void valueChanged(TreeSelectionEvent e) {
DefaultMutableTreeNode node = (DefaultMutableTreeNode) tree.getLastSelectedPathComponent();
if (node == null) {
return;
}
Object userObject = node.getUserObject();
if (userObject instanceof TopicInfo) {
TopicInfo topicInfo = (TopicInfo) userObject;
try {
if (topicInfo.subtopicCount > 0) {
htmlPane.setText(
"<div style='font-family:Verdana,Tahoma;font-size:10px;'>Please choose a topic</div>");
return;
}
URL helpFileUrl = ResourceManager.getHelpFileUrl(topicInfo.id);
if (helpFileUrl == null) {
throw new RuntimeException();
}
String content = CommonUtil.readStringFromUrl(helpFileUrl);
content =
"<html><body style=\"font-family:Verdana,Tahoma;font-size:10px;\">"
+ "<h2>"
+ topicInfo.title
+ "</h2>"
+ content
+ "</body></html>";
((HTMLDocument) htmlPane.getDocument()).setBase(helpFileUrl);
htmlPane.setText(content);
htmlPane.setCaretPosition(0);
} catch (Exception e1) {
htmlPane.setText(
"<div style='color:#FF0000;font-family:Verdana,Tahoma;font-size:10px;'>Cannot read help for \""
+ topicInfo.title
+ "\"!</div>");
}
}
}
/** Constructor - creates layout. */
public HelpFrame() {
setTitle("Web-Harvest Help");
setIconImage(((ImageIcon) ResourceManager.HELP32_ICON).getImage());
this.topNode = new DefaultMutableTreeNode();
this.treeModel = new DefaultTreeModel(this.topNode);
try {
String helpContent = CommonUtil.readStringFromUrl(ResourceManager.getHelpContentUrl());
XmlNode xmlNode = XmlParser.parse(new InputSource(new StringReader(helpContent)));
createNodes(topNode, xmlNode);
} catch (Exception e) {
e.printStackTrace();
GuiUtils.showErrorMessage("Error reading help content!");
}
tree = new JTree(topNode);
tree.setRootVisible(false);
tree.setShowsRootHandles(true);
tree.setBorder(new EmptyBorder(5, 5, 5, 5));
tree.setCellRenderer(
new DefaultTreeCellRenderer() {
public Component getTreeCellRendererComponent(
JTree tree,
Object value,
boolean sel,
boolean expanded,
boolean leaf,
int row,
boolean hasFocus) {
DefaultTreeCellRenderer renderer =
(DefaultTreeCellRenderer)
super.getTreeCellRendererComponent(
tree, value, sel, expanded, leaf, row, hasFocus);
if (value instanceof DefaultMutableTreeNode) {
DefaultMutableTreeNode defaultMutableTreeNode = (DefaultMutableTreeNode) value;
Object userObject = defaultMutableTreeNode.getUserObject();
if (userObject instanceof TopicInfo) {
TopicInfo topicInfo = (TopicInfo) userObject;
renderer.setIcon(
topicInfo.subtopicCount == 0
? ResourceManager.HELPTOPIC_ICON
: ResourceManager.HELPDIR_ICON);
}
}
return renderer;
}
});
tree.addTreeSelectionListener(this);
htmlPane = new JEditorPane();
htmlPane.setEditable(false);
htmlPane.setContentType("text/html");
htmlPane.setEditorKit(new HTMLEditorKit());
htmlPane.setBorder(new EmptyBorder(5, 5, 5, 5));
JSplitPane splitPane = new ProportionalSplitPane(JSplitPane.HORIZONTAL_SPLIT);
splitPane.setResizeWeight(0.0d);
splitPane.setBorder(null);
JScrollPane treeScrollPane = new WHScrollPane(tree);
treeScrollPane.getViewport().setBackground(Color.white);
treeScrollPane.setBackground(Color.white);
splitPane.setLeftComponent(treeScrollPane);
splitPane.setRightComponent(new WHScrollPane(htmlPane));
splitPane.setDividerLocation(0.3d);
Container contentPane = getContentPane();
contentPane.setLayout(new BorderLayout());
contentPane.add(splitPane, BorderLayout.CENTER);
pack();
}