Here is a simple HTML 'editor'
It includes a tabbed pane w. a html textPane (uneditable) and a plain text
pane (editable), and an undo button.
The code does not refresh the hml when it is changed in the plain text
panel though. Refer to the Sun java tutorial for including images in the
display:
http://java.sun.com/docs/books/tutor...ents/text.html
Code:
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;
import javax.swing.text.*;
import javax.swing.text.html.*;
import javax.swing.undo.*;
import java.util.*;
import java.net.*;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
import javax.swing.event.UndoableEditEvent;
import javax.swing.event.UndoableEditListener;
/**
* Simple HTML 'editor'
* @author sjalle
* @version 1.0
*/
public class HTMLEditor extends JFrame implements ActionListener, DocumentListener, UndoableEditListener {
BorderLayout borderLayout1 = new BorderLayout();
JPanel jPanel1 = new JPanel();
JButton getFileBtn = new JButton();
JButton closeBtn = new JButton();
JTabbedPane jTabbedPane1 = new JTabbedPane();
JScrollPane jScrollPane1 = new JScrollPane();
JScrollPane jScrollPane2 = new JScrollPane();
JEditorPane edText = new JEditorPane();
JEditorPane edHTML = new JEditorPane();
Document textDoc=null;
ArrayList undoList=new ArrayList();
JButton undoBtn = new JButton();
public HTMLEditor() {
try {
jbInit();
getFileBtn.addActionListener(this);
undoBtn.addActionListener(this);
closeBtn.addActionListener(this);
}
catch(Exception e) {
e.printStackTrace();
}
}
public void loadFile(String fp) throws Exception {
if (fp==null) return;
String filePath=fp;
File f=new File(fp);
long av=f.length();
if (av==0) {
System.out.println("no data");
return;
}
URL url=new URL("file:"+fp);
edHTML.setPage(url);
FileReader fr=new FileReader(f);
edText.read(fr,null);
textDoc=this.edText.getDocument();
textDoc.addDocumentListener(this);
textDoc.addUndoableEditListener(this);
this.validate();
}
public static void main(String[] args) {
HTMLEditor ed = new HTMLEditor();
ed.setBounds(20,20,500,400);
ed.setVisible(true);
}
private void jbInit() throws Exception {
this.getContentPane().setLayout(borderLayout1);
getFileBtn.setText("Get FIle");
closeBtn.setText("Close");
edText.setText("jEditorPane1");
edHTML.setEditable(false);
edHTML.setText("jEditorPane2");
undoBtn.setEnabled(false);
undoBtn.setText("Undo");
this.getContentPane().add(jPanel1, BorderLayout.SOUTH);
jPanel1.add(getFileBtn, null);
jPanel1.add(undoBtn, null);
jPanel1.add(closeBtn, null);
this.getContentPane().add(jTabbedPane1, BorderLayout.CENTER);
jTabbedPane1.add(jScrollPane1, "HTML");
jScrollPane1.getViewport().add(edHTML, null);
jTabbedPane1.add(jScrollPane2, "Text");
jScrollPane2.getViewport().add(edText, null);
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
}
public void actionPerformed(ActionEvent e) {
if (e.getSource() == this.closeBtn)
System.exit(0);
if (e.getSource() == this.getFileBtn) {
FileDialog fd=new FileDialog(this,"Select File",FileDialog.LOAD);
fd.setVisible(true);
String fName=fd.getFile();
if (fName==null) return;
String fPath=fd.getDirectory()+fName;
try {
loadFile(fPath);
}
catch (Exception ex) {
System.out.println(ex.getMessage());
ex.printStackTrace();
}
} else if (e.getSource() == this.undoBtn) {
undoLast();
}
}
public void undoLast() {
int ix=undoList.size()-1;
if (ix>=0) {
UndoableEdit ue=(UndoableEdit)this.undoList.get(ix);
ue.undo();;
undoList.remove(ix);
if (undoList.size()==0) this.undoBtn.setEnabled(false);
}
}
/**
* If the undoList has any elements then the document has
* been changed
* @return
*/
public boolean isFileChanged() {
return this.undoList.size()>0;
}
public void insertUpdate(DocumentEvent e) {
System.out.println("insertUpdate");
}
public void removeUpdate(DocumentEvent e) {
System.out.println("removeUpdate");
}
public void changedUpdate(DocumentEvent e) {
System.out.println("changedUpdate");
}
public void undoableEditHappened(UndoableEditEvent e) {
this.undoList.add(e.getEdit());
this.undoBtn.setEnabled(true);
}
}
