package scalaExec.scalaLab;
import java.awt.*;
import java.awt.event.*;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.io.*;
import java.net.*;
import java.net.URL;
import java.util.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.text.html.HTMLDocument;
import javax.swing.text.html.HTMLEditorKit;
import scalaExec.Interpreter.GlobalValues;
/** displays HTML documents in an editor pane. */
public class EditorPaneHTMLHelp extends JFrame {
public static Font font;
public JTextField magFactor;
public static double magnificationFactor = GlobalValues.helpMagnificationFactor;
public EditorPaneHTMLHelp(String htmlFile )
{
if (GlobalValues.useSystemBrowserForHelp) {
Desktop d = GlobalValues.desktop;
try {
// create a temp file
GlobalValues.forHTMLHelptempFile = new File("tempHTMLHelpSynthetic.html");
FileWriter fw = new FileWriter(GlobalValues.forHTMLHelptempFile);
java.util.List<String> list = readTextFromJar(htmlFile);
Iterator<String> it = list.iterator();
while(it.hasNext()) {
fw.write(it.next()+"\n");
}
String canonicalPathOfFile = GlobalValues.forHTMLHelptempFile.getCanonicalPath();
URL urlFile = new URL("file://"+canonicalPathOfFile);
URI uriOfFile = urlFile.toURI();
fw.close();
d.browse(uriOfFile);
} catch (Exception e) {
e.printStackTrace();
}
} else {
URL initialURL = getClass().getResource(htmlFile);
font = GlobalValues.htmlfont;
String title = "HTML Help";
setTitle(title);
final Stack<String> urlStack = new Stack<String>();
final JEditorPane editorPane;
editorPane = new JEditorPane(new HTMLEditorKit().getContentType(), " ");
editorPane.setOpaque(false);
editorPane.setBorder(null);
editorPane.setEditable(false);
JPanel magPanel = new JPanel();
magnificationFactor = GlobalValues.helpMagnificationFactor;
magFactor = new JTextField(Double.toString(magnificationFactor));
JButton magButton = new JButton("Set Magnification: ");
magButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
magnificationFactor = Double.parseDouble(magFactor.getText());
GlobalValues.helpMagnificationFactor = magnificationFactor;
}
});
magPanel.setLayout(new GridLayout(1, 2));
magPanel.add(magButton);
magPanel.add(magFactor);
final JTextField url = new JTextField(initialURL.toString());
// set up hyperlink listener
editorPane.setEditable(false);
try
{
// remember URL for back button
urlStack.push(initialURL.toString());
// show URL in text field
url.setText(initialURL.toString());
// add a CSS rule to force body tags to use the default label font
// instead of the value in javax.swing.text.html.default.csss
String bodyRule = "body { font-family: " + font.getFamily() + "; " +
"font-size: " + font.getSize()*GlobalValues.helpMagnificationFactor+ "pt; }";
((HTMLDocument)editorPane.getDocument()).getStyleSheet().addRule(bodyRule);
editorPane.setPage(initialURL);
editorPane.firePropertyChange("dummyProp", true, false);
}
catch (IOException e)
{
editorPane.setText("Exception: " + e);
}
editorPane.addPropertyChangeListener(new PropertyChangeListener() {
public void propertyChange(PropertyChangeEvent evt) {
String bodyRule = "body { font-family: " + font.getFamily() + "; " +
"font-size: " + font.getSize()*GlobalValues.helpMagnificationFactor+ "pt; }";
((HTMLDocument)editorPane.getDocument()).getStyleSheet().addRule(bodyRule);
}
});
editorPane.addHyperlinkListener(new HyperlinkListener()
{
public void hyperlinkUpdate(HyperlinkEvent event)
{
if (event.getEventType() == HyperlinkEvent.EventType.ACTIVATED)
{
try
{
// remember URL for back button
urlStack.push(event.getURL().toString());
// show URL in text field
url.setText(event.getURL().toString());
editorPane.setPage(event.getURL());
editorPane.firePropertyChange("dummyProp", true, false);
}
catch (IOException e)
{
editorPane.setText("Exception: " + e);
}
}
}
});
// set up checkbox for toggling edit mode
final JCheckBox editable = new JCheckBox();
editable.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent event)
{
editorPane.setEditable(editable.isSelected());
}
});
// set up load button for loading URL
ActionListener listener = new ActionListener()
{
public void actionPerformed(ActionEvent event)
{
try
{
// remember URL for back button
urlStack.push(url.getText());
editorPane.setPage(url.getText());
editorPane.firePropertyChange("dummyProp", true, false);
}
catch (IOException e)
{
editorPane.setText("Exception: " + e);
}
}
};
JButton loadButton = new JButton("Load/Magnify");
loadButton.addActionListener(listener);
url.addActionListener(listener);
// set up back button and button action
JButton backButton = new JButton("Back");
backButton.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent event)
{
if (urlStack.size() <= 1) return;
try
{
// get URL from back button
urlStack.pop();
// show URL in text field
String urlString = urlStack.peek();
url.setText(urlString);
editorPane.setPage(urlString);
editorPane.firePropertyChange("dummyProp", true, false);
}
catch (IOException e)
{
editorPane.setText("Exception: " + e);
}
}
});
JPanel allPanel = new JPanel(new BorderLayout());
// put all control components in a panel
JPanel ctrlPanel = new JPanel(new BorderLayout());
JPanel urlPanel = new JPanel();
urlPanel.add(new JLabel("URL"));
urlPanel.add(url);
JPanel buttonPanel = new JPanel();
buttonPanel.add(loadButton);
buttonPanel.add(backButton);
buttonPanel.add(new JLabel("Editable"));
buttonPanel.add(magPanel);
buttonPanel.add(editable);
ctrlPanel.add(buttonPanel, BorderLayout.NORTH);
ctrlPanel.add(urlPanel, BorderLayout.CENTER);
allPanel.add(ctrlPanel, BorderLayout.NORTH);
allPanel.add(new JScrollPane(editorPane), BorderLayout.CENTER);
add(allPanel);
}
}
public java.util.List<String> readTextFromJar(String s) {
InputStream is = null;
BufferedReader br = null;
String line;
ArrayList<String> list = new ArrayList<String>();
try {
is = getClass().getResourceAsStream(s);
br = new BufferedReader(new InputStreamReader(is));
while (null != (line = br.readLine())) {
list.add(line);
}
}
catch (Exception e) {
e.printStackTrace();
}
finally {
try {
if (br != null) br.close();
if (is != null) is.close();
}
catch (IOException e) {
e.printStackTrace();
}
}
return list;
}
/**
This frame contains an editor pane, a text field and button
to enter a URL and load a document, and a Back button to
return to a previously loaded document.
*/
public EditorPaneHTMLHelp(String initialURL, String title)
{
this(initialURL);
setTitle(title);
}
}