I wrote the logic for Undo and Redo operations.But,It's not working correctly.When I Open a File Then I click "Rollback",The whole file content was removed and When I replace any Word using Replace MenuItem,Then I Click on Rollback The replace text is not rollback,The Whole Text removed.Please Help Me.Thank you.
My Code:
public class UndoAndRedoAction extends javax.swing.JFrame {
JTextArea text;
int i=0;
UndoManager undoManager = new UndoManager();
public UndoAndRedoAction() {
initComponents();
text = new JTextArea();
rollback.setEnabled(false);
redo.setEnabled(false);
}
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
tp = new javax.swing.JTabbedPane();
jMenuBar1 = new javax.swing.JMenuBar();
fileMenu = new javax.swing.JMenu();
open = new javax.swing.JMenuItem();
rollback = new javax.swing.JMenuItem();
redo = new javax.swing.JMenuItem();
replace = new javax.swing.JMenuItem();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
fileMenu.setText("File");
open.setText("Open");
open.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
openActionPerformed(evt);
}
});
fileMenu.add(open);
rollback.setText("Rollback");
rollback.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
rollbackActionPerformed(evt);
}
});
fileMenu.add(rollback);
redo.setText("Redo");
redo.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
redoActionPerformed(evt);
}
});
fileMenu.add(redo);
replace.setText("Replace");
replace.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
replaceActionPerformed(evt);
}
});
fileMenu.add(replace);
jMenuBar1.add(fileMenu);
setJMenuBar(jMenuBar1);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(tp, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, 400, Short.MAX_VALUE)
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(tp, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, 279, Short.MAX_VALUE)
);
pack();
}// </editor-fold>
private void openActionPerformed(java.awt.event.ActionEvent evt) {
final JFileChooser jc = new JFileChooser();
int returnVal= jc.showOpenDialog(UndoAndRedoAction.this);
String title;
File file=null;
if(returnVal == JFileChooser.APPROVE_OPTION)
file = jc.getSelectedFile();
if (jc.getSelectedFile()!= null) {
BufferedReader br = null;
StringBuffer str = new StringBuffer("");
try {
br = new BufferedReader(new FileReader(file));
String line;
while ((line = br.readLine()) != null) {
str.append(line + "\n");
}
}
catch (IOException ex) {
Logger.getLogger(UndoAndRedoAction.class.getName()).log(Level.SEVERE, null, ex);
}
String t = str.toString();
final JInternalFrame internalFrame = new JInternalFrame("",true,true);
title=file.getName();
text.setFont(new java.awt.Font("Miriam Fixed", 0, 13));
internalFrame.add(text);
i+=1;
internalFrame.setName("Doc "+i);
JScrollPane scrollpane=new JScrollPane(text);
internalFrame.setTitle(title);
tp.add(internalFrame);
internalFrame.add(scrollpane);
internalFrame.setVisible(true);
text.setText(t);
text.setCaretPosition(0);
text.getDocument().addUndoableEditListener(new UndoableEditListener() {
@Override
public void undoableEditHappened(UndoableEditEvent e) {
undoManager.addEdit(e.getEdit());
rollback.setEnabled(undoManager.canUndo());
redo.setEnabled(undoManager.canRedo());
}
});
}
}
private void rollbackActionPerformed(java.awt.event.ActionEvent evt) {
rollback.setEnabled(undoManager.canUndo());
if (undoManager.canUndo()) {
undoManager.undo();
}
rollback.setEnabled(undoManager.canUndo());
redo.setEnabled(undoManager.canRedo());
}
private void redoActionPerformed(java.awt.event.ActionEvent evt) {
redo.setEnabled(undoManager.canRedo());
if (undoManager.canRedo()) {
undoManager.redo();
}
rollback.setEnabled(undoManager.canUndo());
redo.setEnabled(undoManager.canRedo());
}
private void replaceActionPerformed(java.awt.event.ActionEvent evt) {
JDialog replace_dialog=new JDialog(UndoAndRedoAction.this);
replace_dialog.setTitle("Replace");
JLabel find_label=new JLabel("Find what");
final JTextField find_tf=new JTextField(10);
JLabel replace_label=new JLabel("Replace With");
final JTextField replace_tf=new JTextField(10);
JButton replaceAll=new JButton("Replace All");
replace_dialog.setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
c.insets = new Insets(5, 5, 5, 5);
c.gridx = 0;
c.gridy = 0;
c.anchor = GridBagConstraints.WEST;
replace_dialog.add(find_label, c);
c.gridx++;
c.fill = GridBagConstraints.HORIZONTAL;
c.weightx = 1;
replace_dialog.add(find_tf, c);
c.gridx = 0;
c.gridy = 1;
c.gridwidth = 2;
replace_dialog.add(replace_label, c);
c.gridx++;
c.fill = GridBagConstraints.HORIZONTAL;
c.weightx = 1;
replace_dialog.add(replace_tf, c);
c.gridx++;
c.gridx++;
c.gridwidth = 1;
c.fill = GridBagConstraints.HORIZONTAL;
replace_dialog.add(replaceAll, c);
replace_dialog.setSize(400,400);
replace_dialog.setLocationRelativeTo(null);
replace_dialog.pack();
replace_dialog.setVisible(true);
replaceAll.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
text.setText(text.getText().replaceAll(find_tf.getText(), replace_tf.getText()));
}
});
}
public static void main(String args[]) {
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(UndoAndRedoAction.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(UndoAndRedoAction.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(UndoAndRedoAction.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(UndoAndRedoAction.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new UndoAndRedoAction().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JMenu fileMenu;
private javax.swing.JMenuBar jMenuBar1;
private javax.swing.JMenuItem open;
private javax.swing.JMenuItem redo;
private javax.swing.JMenuItem replace;
private javax.swing.JMenuItem rollback;
private javax.swing.JTabbedPane tp;
// End of variables declaration
}
Ok @user3912886, now i understand your problem. Your issue is that opening a file shouldn't de undoable. Then you can assing first the text to text area and later add the listener.
public class UndoAndRedo extends javax.swing.JFrame {
int i = 0;
UndoManager undoManager = new UndoManager();
public UndoAndRedo() {
initComponents();
rollback.setEnabled(false);
redo.setEnabled(false);
}
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
tp = new javax.swing.JTabbedPane();
jMenuBar1 = new javax.swing.JMenuBar();
fileMenu = new javax.swing.JMenu();
open = new javax.swing.JMenuItem();
rollback = new javax.swing.JMenuItem();
redo = new javax.swing.JMenuItem();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
fileMenu.setText("File");
open.setText("Open");
open.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
openActionPerformed(evt);
}
});
fileMenu.add(open);
rollback.setText("Rollback");
rollback.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
rollbackActionPerformed(evt);
}
});
fileMenu.add(rollback);
redo.setText("Redo");
redo.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
redoActionPerformed(evt);
}
});
fileMenu.add(redo);
jMenuBar1.add(fileMenu);
setJMenuBar(jMenuBar1);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(tp, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, 400, Short.MAX_VALUE)
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(tp, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, 279, Short.MAX_VALUE)
);
pack();
}// </editor-fold>
private void openActionPerformed(java.awt.event.ActionEvent evt) {
final JFileChooser jc = new JFileChooser();
int returnVal = jc.showOpenDialog(UndoAndRedo.this);
String title;
File file = null;
if (returnVal == JFileChooser.APPROVE_OPTION) {
file = jc.getSelectedFile();
}
JTextArea text = new JTextArea();
if (jc.getSelectedFile() != null) {
BufferedReader br = null;
StringBuffer str = new StringBuffer("");
try {
br = new BufferedReader(new FileReader(file));
String line;
while ((line = br.readLine()) != null) {
str.append(line + "\n");
}
} catch (IOException ex) {
Logger.getLogger(UndoAndRedo.class.getName()).log(Level.SEVERE, null, ex);
}
String t = str.toString();
final JInternalFrame internalFrame = new JInternalFrame("", true, true);
title = file.getName();
text.setFont(new java.awt.Font("Miriam Fixed", 0, 13));
i += 1;
internalFrame.setName("Doc " + i);
JScrollPane scrollpane = new JScrollPane(text);
internalFrame.setTitle(title);
tp.add(internalFrame);
internalFrame.add(scrollpane);
internalFrame.setVisible(true);
text.setText(t);
text.setCaretPosition(0);
text.getDocument().addUndoableEditListener(new UndoableEditListener() {
@Override
public void undoableEditHappened(UndoableEditEvent e) {
undoManager.addEdit(e.getEdit());
rollback.setEnabled(undoManager.canUndo());
redo.setEnabled(undoManager.canRedo());
}
});
}
}
private void rollbackActionPerformed(java.awt.event.ActionEvent evt) {
rollback.setEnabled(undoManager.canUndo());
if (undoManager.canUndo()) {
undoManager.undo();
}
rollback.setEnabled(undoManager.canUndo());
redo.setEnabled(undoManager.canRedo());
}
private void redoActionPerformed(java.awt.event.ActionEvent evt) {
redo.setEnabled(undoManager.canRedo());
if (undoManager.canRedo()) {
undoManager.redo();
}
rollback.setEnabled(undoManager.canUndo());
redo.setEnabled(undoManager.canRedo());
}
public static void main(String args[]) {
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(UndoAndRedo.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(UndoAndRedo.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(UndoAndRedo.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(UndoAndRedo.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new UndoAndRedo().setVisible(true);
}
});
}
private javax.swing.JMenu fileMenu;
private javax.swing.JMenuBar jMenuBar1;
private javax.swing.JMenuItem open;
private javax.swing.JMenuItem redo;
private javax.swing.JMenuItem rollback;
private javax.swing.JTabbedPane tp;
}