Help in building little text editor that perform the UNDO operation

[realahmed8]

Can anyone please help me in building little application that perform only the undo operation, so the program is just text area and one button..
when pressed last character deleted from text area..

thank you..

[Fubarable]

Sure, I'll help you if I can, but you'll need to post the code you have first. Best of luck.

[Eranga]

Lol this is not a code bank, this is a forum where discussions take place. You must put an effort first of all. If you stuck on something post your full details question here.

HINT: Read about Undo Manager.

[realahmed8]

well, i have used the undo manager to do it, but i need to build it from internal i.e. using Stack for example..

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;
import javax.swing.undo.*;
import javax.swing.text.*; 
import javax.swing.event.*; 

public class UndoOp extends JFrame {

private JTextPane t1;
private UndoManager undo;

 public UndoOp() {
 
  super("Undo Operation");

  t1 = new JTextPane();

  undo = new UndoManager();
  Document doc = t1.getDocument();
  
  JPanel p1 = new JPanel();
  JPanel p2 = new JPanel();
 
  JButton b1 = new JButton("Undo");
  

  p1.setLayout(new GridLayout(1,1));
  p1.add(new JScrollPane(t1)); 
  p2.add(b1);
 
 
  this.getContentPane().add(p1, BorderLayout.CENTER);
  this.getContentPane().add(p2, BorderLayout.SOUTH);

   setSize(300, 200);
  show();

  doc.addUndoableEditListener(new UndoableEditListener() {
  public void undoableEditHappened(UndoableEditEvent evt) {
  undo.addEdit(evt.getEdit());
  }
  });
  
  b1.addActionListener(new ActionListener() { 

  public void actionPerformed(ActionEvent h) 
  { 
  try {
  if (undo.canUndo()) {
  undo.undo();
  }
  } 
  catch (CannotUndoException e) {
  }
  } 
  }); 

  }

  public static void main( String args[] )
   {
      UndoOp app = new UndoOp();

      app.addWindowListener(
         new WindowAdapter() {
           }
      );
   }
}

looking for help, thank you..

[einer08]

Hello enyone.
Im new in Java. I have to create a simply text editor in java with these menu bar:

File:
Edit:
Cut, Copy, Paste
Foramt:
Font -> Times new Roman, Arial, Tahoma, Courier
Size -> 12pt, 14pt, 16pt
Bold
Italic
Colour -> Red, Blue, Black

The file that savet by these text editor need to save to .txt

Plese hellp me.
Thnx.

[Fubarable]

what in particular do you need help with?

[angryboy]

einer08, please do not hijack someone's thread.