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>");
}
}
}
