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Displaying Source Code(s)
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Text Editor
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Description : it is similar to notepad and user friendly
import java.awt.*;
import java.awt.event.*;
import java.awt.datatransfer.*;
import java.applet.*;
import java.io.*;
import javax.swing.*;
import javax.swing.undo.*;
import java.util.Hashtable;
class UndoableTextArea extends TextArea implements StateEditable
{
private final static String KEY_STATE="UndoableTextAreaKey";
private boolean textChanged=false;
private UndoManager undoManager;
private StateEdit currentEdit;
public UndoableTextArea()
{
super();
initUndoable();
}
public UndoableTextArea(String string)
{
super(string);
initUndoable();
}
public UndoableTextArea(int rows,int columns)
{
super(rows,columns);
initUndoable();
}
public UndoableTextArea(String string,int rows,int columns)
{
super(string,rows,columns);
initUndoable();
}
public UndoableTextArea(String string,int rows,int columns,int
scrollbars)
{
super(string,rows,columns,scrollbars);
initUndoable();
}
public boolean undo(){
try{
undoManager.undo();
return true;
}
catch(CannotUndoException e)
{
System.out.println("cannot undo");
return false;
}
}
public boolean redo()
{
try{
undoManager.redo();
return true;
}
catch(CannotRedoException e)
{
System.out.println("cannot redo");
return false;
}
}
public void storeState(Hashtable state)
{
state.put(KEY_STATE,getText());
}
public void restoreState(Hashtable state)
{
Object data=state.get(KEY_STATE);
if(data!=null){
setText((String)data);
}
}
private void takeSnapshot()
{
if(textChanged)
{
currentEdit.end();
undoManager.addEdit(currentEdit);
textChanged=false;
currentEdit=new StateEdit(this);
}
}
private void initUndoable()
{
undoManager =new UndoManager();
currentEdit=new StateEdit(this);
addKeyListener(new KeyAdapter(){
public void keyPressed(KeyEvent event){
if(event.isActionKey()){
takeSnapshot();
}
}
});
addFocusListener(new FocusAdapter(){
public void focusLost(FocusEvent fe){
takeSnapshot();
}
});
addTextListener(new TextListener(){
public void textValueChanged(TextEvent e){
textChanged=true;
takeSnapshot();
}
});
}
}
public class TextEditor extends Frame
{
boolean b=true;
Frame fm;
FileDialog fd;
Font f;
int style=Font.PLAIN;
int fsize=12;
UndoableTextArea txt;
String filename,st,fn="untitled",dn;
Clipboard clip=getToolkit().getSystemClipboard();
TextEditor()
{
f=new Font("Courier",style,fsize);
setLayout(new GridLayout(1,1));
txt=new UndoableTextArea(80,25);
txt.setFont(f);
add(txt);
MenuBar mb=new MenuBar();
Menu fonttype=new Menu("FontType");
MenuItem one,two,three,four,five,six;
one=new MenuItem("TimesRoman");
two=new MenuItem("Helvetica");
three=new MenuItem("Courier");
four=new MenuItem("Arial");
five=new MenuItem("Arial Black");
six=new MenuItem("Century");
fonttype.add(one);
fonttype.add(two);
fonttype.add(three);
fonttype.add(four);
fonttype.add(five);
fonttype.add(six);
one.addActionListener(new Type());
two.addActionListener(new Type());
three.addActionListener(new Type());
four.addActionListener(new Type());
five.addActionListener(new Type());
six.addActionListener(new Type());
Menu fontmenu=new Menu("Font");
MenuItem boldmenu=new MenuItem("Bold");
MenuItem plainmenu=new MenuItem("Plain");
MenuItem italicmenu=new MenuItem("Italic");
fontmenu.add(boldmenu);
fontmenu.add(plainmenu);
fontmenu.add(italicmenu);
boldmenu.addActionListener(new FM());
plainmenu.addActionListener(new FM());
italicmenu.addActionListener(new FM());
Menu size=new Menu("Size");
MenuItem s1,s2,s3,s4,s5,s6,s7,s8,s9,s10;
s1=new MenuItem("10");
s2=new MenuItem("12");
s3=new MenuItem("14");
s4=new MenuItem("16");
s5=new MenuItem("18");
s6=new MenuItem("20");
s7=new MenuItem("22");
s8=new MenuItem("24");
s9=new MenuItem("26");
s10=new MenuItem("28");
size.add(s1);
size.add(s2);
size.add(s3);
size.add(s4);
size.add(s5);
size.add(s6);
size.add(s7);
size.add(s8);
size.add(s9);
size.add(s10);
s1.addActionListener(new Size());
s2.addActionListener(new Size());
s3.addActionListener(new Size());
s4.addActionListener(new Size());
s5.addActionListener(new Size());
s6.addActionListener(new Size());
s7.addActionListener(new Size());
s8.addActionListener(new Size());
s9.addActionListener(new Size());
s10.addActionListener(new Size());
size.addActionListener(new FM());
fontmenu.add(size);
Menu file=new Menu("File");
MenuItem n=new MenuItem("New",new
MenuShortcut(KeyEvent.VK_N));
MenuItem o=new MenuItem("Open",new
MenuShortcut(KeyEvent.VK_O));
MenuItem s=new MenuItem("Save",new
MenuShortcut(KeyEvent.VK_S));
MenuItem e=new MenuItem("Exit",new
MenuShortcut(KeyEvent.VK_E));
n.addActionListener(new New());
file.add(n);
o.addActionListener(new Open());
file.add(o);
s.addActionListener(new Save());
file.add(s);
e.addActionListener(new Exit());
file.add(e);
mb.add(file);
addWindowListener(new Win());
Menu edit=new Menu("Edit");
MenuItem cut=new MenuItem("Cut",new
MenuShortcut(KeyEvent.VK_X));
MenuItem copy=new MenuItem("Copy",new
MenuShortcut(KeyEvent.VK_C));
MenuItem paste=new MenuItem("Paste",new
MenuShortcut(KeyEvent.VK_V));
cut.addActionListener(new Cut());
edit.add(cut);
copy.addActionListener(new Copy());
edit.add(copy);
paste.addActionListener(new Paste());
edit.add(paste);
Menu color =new Menu("Color");
MenuItem Bg=new MenuItem("Background");
MenuItem Fg=new MenuItem("Foreground");
Bg.addActionListener(new BC());
Fg.addActionListener(new BC());
Menu undo=new Menu("Undo&Redo");
MenuItem un=new MenuItem("Undo");
MenuItem re=new MenuItem("Redo");
re.addActionListener(new WW());
un.addActionListener(new WW());
undo.add(un);
undo.add(re);
color.add(Bg);
color.add(Fg);
mb.add(edit);
mb.add(fontmenu);
mb.add(fonttype);
mb.add(color);
mb.add(undo);
setMenuBar(mb);
mylistener mylist=new mylistener();
addWindowListener(mylist);
}
class WW implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
String se=e.getActionCommand();
if(se.equals("Undo"))
txt.undo();
if(se.equals("Redo"))
txt.redo();
}
}
class mylistener extends WindowAdapter
{
public void windowClosing(WindowEvent we)
{
if(!b)
System.exit(0);
}
}
class New implements ActionListener
{
public void actionPerformed(ActionEvent ae)
{
txt.setText(" ");
setTitle(filename);
fn="Untitled";
}
}
class Open implements ActionListener
{
public void actionPerformed(ActionEvent ae)
{
FileDialog fd=new FileDialog(TextEditor.this,"Select
File",FileDialog.LOAD);
fd.show();
if((fn=fd.getFile())!=null)
{
filename=fd.getDirectory()+fd.getFile();
dn=fd.getDirectory();
setTitle(filename);
readFile();
}
txt.requestFocus();
}
}
class Save implements ActionListener
{
public void actionPerformed(ActionEvent ae)
{
FileDialog fd=new FileDialog(TextEditor.this,"Save
File",FileDialog.SAVE);
fd.setFile(fn);
fd.setDirectory(dn);
fd.show();
if(fd.getFile()!=null)
{
filename=fd.getDirectory()+fd.getFile();
setTitle(filename);
writeFile();
txt.requestFocus();
}
}
}
class Exit implements ActionListener
{
public void actionPerformed(ActionEvent ae)
{
System.exit(0);
}
}
void readFile()
{
BufferedReader d;
StringBuffer sb=new StringBuffer();
try{
d=new BufferedReader(new FileReader(filename));
String line;
while((line=d.readLine())!=null)
sb.append(line+"<BR>);
txt.setText(sb.toString());
d.close();
}catch(FileNotFoundException e){
System.out.println("File not found");
}catch(IOException e){ }
}
public void writeFile()
{
try{
DataOutputStream d=new DataOutputStream(new
FileOutputStream(filename));
String line=txt.getText();
BufferedReader br=new BufferedReader(new
StringReader(line));
while((line=br.readLine())!=null)
{
d.writeBytes(line+"<BR>);
}d.close();
}catch(Exception e){
System.out.println("File not found");
}
}
class Cut implements ActionListener
{
public void actionPerformed(ActionEvent ae)
{
String sel=txt.getSelectedText();
StringSelection ss=new StringSelection(sel);
clip.setContents(ss,ss);
txt.replaceRange("<BR>,txt.getSelectionStart(),txt.getSelectionEnd());
}
}
class Copy implements ActionListener
{
public void actionPerformed(ActionEvent ae)
{
String sel=txt.getSelectedText();
StringSelection clipstring=new StringSelection(sel);
clip.setContents(clipstring,clipstring);
}
}
class Paste implements ActionListener
{
public void actionPerformed(ActionEvent ae)
{
Transferable
cliptran=clip.getContents(TextEditor.this);
try{
String
sel=(String)cliptran.getTransferData(DataFlavor.stringFlavor);
txt.replaceRange(sel,txt.getSelectionStart(),txt.getSelectionEnd());
}catch(Exception e){
System.out.println("not starting flavor");
}
}
}
class Win extends WindowAdapter
{
public void windowClosing(WindowEvent we)
{
ConfirmDialog cd=new ConfirmDialog();
if(!b)
{
System.exit(0);
}
}
}
class ConfirmDialog extends JPanel
{
public ConfirmDialog()
{
int result;
result=JOptionPane.showConfirmDialog(this,fn+" not saved do you
want to save"/*,"Message Box",JOptionPane.QUESTION_MESSAGE*/);
switch(result)
{
case JOptionPane.YES_OPTION:
FileDialog fd=new FileDialog(TextEditor.this,"Save
File",FileDialog.SAVE);
fd.setFile(fn);
fd.setDirectory(dn);
fd.show();
if(fd.getFile()!=null)
{
filename=fd.getDirectory()+fd.getFile();
setTitle(filename);
writeFile();
txt.requestFocus();
}
System.out.println("Yes button pressed");
break;
case JOptionPane.NO_OPTION:
dispose();
System.exit(0);
System.out.println("NO button pressed");
break;
case JOptionPane.CANCEL_OPTION:
setVisible(true);
//b=false;
repaint();
System.out.println("Cancel button pressed");
break;
case JOptionPane.CLOSED_OPTION:
System.out.println("Closed button pressed");
break;
}
}
}
class Size implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
int style=f.getStyle();
String w=e.getActionCommand();
if(w=="10")
{
f= new Font("Courier",style,10);
txt.setFont(f);
fsize=f.getSize();
repaint();
}
if(w=="12")
{
f= new Font("Courier",style,12);
fsize=f.getSize();
txt.setFont(f);
repaint();
}
if(w=="14")
{
f= new Font("Courier",style,14);
fsize=f.getSize();
txt.setFont(f);
repaint();
}
if(w=="16")
{
f= new Font("Courier",style,16);
txt. setFont(f);
fsize=f.getSize();
repaint();
}
if(w=="18")
{
f= new Font("Courier",style,18);
txt.setFont(f);
fsize=f.getSize();
repaint();
}
if(w=="20")
{
f= new Font("Courier",style,20);
txt.setFont(f);
fsize=f.getSize();
repaint();
}
if(w=="22")
{
f= new Font("Courier",style,22);
txt.setFont(f);
fsize=f.getSize();
repaint();
}
if(w=="24")
{
f= new Font("Courier",style,24);
txt.setFont(f);
fsize=f.getSize();
repaint();
}
if(w=="26")
{
f= new Font("Courier",style,26);
txt.setFont(f);
fsize=f.getSize();
repaint();
}
if(w=="28")
{
f= new Font("Courier",style,28);
txt.setFont(f);
fsize=f.getSize();
repaint();
}
}
}
class FM extends Applet implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
String b=e.getActionCommand();
if(b=="Bold")
{
f= new Font("Courier",Font.BOLD,fsize);
style=f.getStyle();
txt.setFont(f);
}
if(b=="Plain")
{
f= new Font("Courier",Font.PLAIN,fsize);
style=f.getStyle();
txt.setFont(f);
}
if(b=="Italic")
{
f= new Font("Courier",Font.ITALIC,fsize);
txt.setFont(f);
}
repaint();
}
}
class Type implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
String lbl=e.getActionCommand();
if(lbl=="TimesRoman")
{
f=new Font("TimesRoman",style,fsize);
txt.setFont(f);
}
if(lbl=="Courier")
{
f=new Font("Courier",style,fsize);
txt.setFont(f);
}
if(lbl=="Helvetica")
{
f=new Font("Helvetica",style,fsize);
txt.setFont(f);
}
if(lbl=="Arial")
{
f=new Font("Arial",style,fsize);
txt.setFont(f);
}
if(lbl=="Arial Black")
{
f=new Font("ArialBlack",style,fsize);
txt.setFont(f);
}
if(lbl=="Century")
{
f=new Font("Century",style,fsize);
txt.setFont(f);
}
repaint();
}
}
class BC implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
st=e.getActionCommand();
JFrame jf=new JFrame("JColorChooser");
colorChooser c=new colorChooser();
c.setSize(400,300);
c.setVisible(true);
}
}
class colorChooser extends JFrame
{
Button ok;
JColorChooser jcc;
public colorChooser(){
setTitle("JColorChooser");
jcc=new JColorChooser();
JPanel content=(JPanel)getContentPane();
content.setLayout(new BorderLayout());
content.add(jcc,"Center");
ok=new Button("OK");
content.add(ok,"South");
ok.addActionListener(new B());
}
class B implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
System.out.println("Color Is:"+jcc.getColor().toString());
if(st.equals("Background"))
txt.setBackground(jcc.getColor());
if(st.equals("Foreground"))
txt.setForeground(jcc.getColor());
setVisible(false);
}
}
}
public static void main(String args[])
{
Frame fm=new TextEditor();
fm.setSize(800,600);
fm.setVisible(true);
fm.show();
}
} |
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123
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