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AddDocumentListener's variable scope when creating two titles (using TitledBorder) in Java Swing

Hello I am trying to display one String ("Character Count: ") and one dynamic character count on the bottom of JTextArea.
When I run this code below, there is a panel that opens up without characterCountTitle. Only when I start typing, characterCountTitle displays and the number is correctly dynamic.
My goal is to show characterCountTitle (string + character count) as soon as the panel is open to users.
private void initComponents() {
this.notePanel.getNoteDocument().addDocumentListener(new DocumentListener() {
TitledBorder characterCountTitle;
Border emptyBorder;
public void insertUpdate(DocumentEvent e) {
displayEditInfo(e);
}
public void removeUpdate(DocumentEvent e) {
displayEditInfo(e);
}
public void changedUpdate(DocumentEvent e) {
displayEditInfo(e);
}
private void displayEditInfo(DocumentEvent e) {
Document document = e.getDocument();
emptyBorder = BorderFactory.createEmptyBorder();
//displays a string of "Character Count: " and another string of dynamic character count
characterCountTitle = BorderFactory.createTitledBorder(emptyBorder, "Character Count: " + document.getLength());
characterCountTitle.setTitlePosition(TitledBorder.BOTTOM);
panel.setBorder(characterCountTitle);
}
});
this.panel.add(notePanel, BorderLayout.CENTER);
this.panel.add(navigation.buildPanel(), BorderLayout.SOUTH);
}
Due to this issue, I was trying to create two titles; one for string(outside of addDocumentListener) and one for character count (inside displayEditInfo method), but it messes up the variable scope.
I'd greatly appreciate your input!

You may simply create and add your border outside of the DocumentListener, and just change the title text on document events :
private void initComponents() {
Border emptyBorder = BorderFactory.createEmptyBorder();
final TitledBorder characterCountTitle = BorderFactory.createTitledBorder(emptyBorder, "Character Count:");
characterCountTitle.setTitlePosition(TitledBorder.BOTTOM);
panel.setBorder(characterCountTitle);
this.notePanel.getNoteDocument().addDocumentListener(new DocumentListener() {
public void insertUpdate(DocumentEvent e) {
displayEditInfo(e);
}
public void removeUpdate(DocumentEvent e) {
displayEditInfo(e);
}
public void changedUpdate(DocumentEvent e) {
displayEditInfo(e);
}
private void displayEditInfo(DocumentEvent e) {
Document document = e.getDocument();
//displays a string and dynamic character count
characterCountTitle.setTitle("Character Count: " + document.getLength());
panel.repaint();
}
});
this.panel.add(notePanel, BorderLayout.CENTER);
this.panel.add(navigation.buildPanel(), BorderLayout.SOUTH);
}

Restrict Input of JTextField to Double Numbers?

In java , i am trying to make simple currency converter, but for that i need a text field which can restrict input to numbers only and more importantly double numbers. I tried using JFormatedTextField but it only format the input after you have done your input and click elsewhere but i need to restrict TextField to consume() each invalid character while doing input.
Possible Attempts:
Using JFormatedTextField:
JFormatedTextField textField = new JFormatedTextField(new DoubleFormat());
textField.setBounds(190, 49, 146, 33);
frame.getContentPane().add(textField);
textField.setColumns(10);
Using KeyTyped Event:
char c = arg0.getKeyChar();
if(!(Character.isDigit(c) || c == KeyEvent.VK_BACK_SPACE || c== KeyEvent.VK_DELETE)){
arg0.consume();
}
Using KeyTyped Event with regex:
if(!((textField.getText().toString+arg0.getKeyChar()).matches("[0-9]*(.[0-9]*)?"))){
arg0.consume();
}
Second and third attempt were close but then second attempt failed on point values and third attempt always read first character on textField no matter what it is, So any suggestions ? i am not very fond of JAVA GUI so kindly be patient.

If you know how many places before and after decimal point you want, you can also use MaskFormatter. For example:
JFormattedTextField field = new JFormattedTextField(getMaskFormatter("######.##"));
(...)
private MaskFormatter getMaskFormatter(String format) {
MaskFormatter mask = null;
try {
mask = new MaskFormatter(format);
mask.setPlaceholderCharacter('0');
}catch (ParseException ex) {
ex.printStackTrace();
}
return mask;
}
However it will chenge a look of JTextField, so it will be always visible 000000.00 in it.
EDIT
Another way, not too elegant, but in my opinion working. Try with DecumentListener, maybe it will suit your needs:
field = new JFormattedTextField();
field.getDocument().addDocumentListener(new DocumentListener() {
#Override
public void insertUpdate(DocumentEvent e) {
Runnable format = new Runnable() {
#Override
public void run() {
String text = field.getText();
if(!text.matches("\\d*(\\.\\d{0,2})?")){
field.setText(text.substring(0,text.length()-1));
}
}
};
SwingUtilities.invokeLater(format);
}
#Override
public void removeUpdate(DocumentEvent e) {
}
#Override
public void changedUpdate(DocumentEvent e) {
}
});
I used regex: \\d*(\\.\\d{0,2})? because two decimal places is enough for currency.

You would need to use a DocumentFilter. Read the section from the Swing tutorial on Implementing a DocumentFilter for an example to get you started.
Your implementation will be more complex because you will need to take the text already in the Document and then insert the new text in the appropriate location in the String and then invoke Double.parseDouble(...) on the String to make sure it is a valid double value.
If the validation succeeds then you continue with the insertion otherwise you can generate beep.

You can add a key listener to the text field and implement the keyReleased() method to determine if they value in the text field is a double after every key stroke by the user.
public class CurrencyJTF extends JFrame {
JButton jButton = new JButton("Unfocus");
final JFormattedTextField textField = new JFormattedTextField(new DecimalFormat());
double lastDouble = 0.0;
public CurrencyJTF() throws HeadlessException {
textField.setColumns(20);
textField.setText(lastDouble + "");
this.setLayout(new FlowLayout());
this.add(textField);
this.add(jButton);
textField.addKeyListener(new KeyAdapter() {
#Override
public void keyReleased(KeyEvent e) {
handleKeyReleased();
}
});
}
private void handleKeyReleased() {
String text = textField.getText();
if (text.isEmpty()) return;
try {
lastDouble = Double.parseDouble(text);
} catch (NumberFormatException ex) {
textField.setText(lastDouble + ""); // or set to other values you want
}
}
public static void main(String[] args) {
JFrame frame = new CurrencyJTF();
frame.setVisible(true);
frame.pack();
}
}

You can write your own KeyListener something like that:
public class DoubleNumbersKeyListener implements KeyListener {
final HashSet<Character> valid_keys = new HashSet<>();
final ArrayList<Character> sequence = new ArrayList<>();
public DoubleNumbersKeyListener() {
valid_keys.add('.');
valid_keys.add('0');
valid_keys.add('1');
valid_keys.add('2');
valid_keys.add('3');
valid_keys.add('4');
valid_keys.add('5');
valid_keys.add('6');
valid_keys.add('7');
valid_keys.add('8');
valid_keys.add('9');
valid_keys.add((char) KeyEvent.VK_BACK_SPACE);
valid_keys.add((char) KeyEvent.VK_DELETE);
}
#Override
public void keyTyped(KeyEvent event) {
char c = event.getKeyChar();
if (!valid_keys.contains(c)) {
event.consume();
} else {
if (c == KeyEvent.VK_DELETE || c == KeyEvent.VK_BACK_SPACE) {
if (!sequence.isEmpty()) {
char last = sequence.remove(sequence.size() - 1);
if (last == '.') {
valid_keys.add(last);
}
}
} else {
sequence.add(c);
if (c == '.') {
valid_keys.remove(c);
}
}
}
}
#Override
public void keyPressed(KeyEvent e) {
}
#Override
public void keyReleased(KeyEvent e) {
}
}

inserting tables to html document java swing

I have a simple swing application with two JTextPanes. In the first I write a html code and in the second I get the appearance defined by this html. I want to have button which allows me to insert a table into the document.
Here is my code:
public class TestEditor extends JFrame {
public TestEditor(){
createConnection();
createGUI();
}
private void createGUI(){
setDefaultCloseOperation(EXIT_ON_CLOSE);
JScrollPane scroll1=new JScrollPane(text);
JScrollPane scroll2=new JScrollPane(html);
JSplitPane split=new JSplitPane();
split.setLeftComponent(scroll1);
split.setRightComponent(scroll2);
split.setDividerLocation(0.5);
split.setResizeWeight(0.5);
getContentPane().add(split);
table=new JButton("Insert table");
table.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
StringBuilder builder=new StringBuilder("<table border=1>\n");
for(int i=0;i<4;i++){
builder.append("<tr>");
for(int j=0;j<4;j++){
builder.append("<td></td>");
}
builder.append("</tr>\n");
}
builder.append("</table>\n");
try{
text.getStyledDocument().insertString(text.getCaretPosition(), builder.toString(), null);
}catch(BadLocationException ex){
ex.printStackTrace();
}
}
});
getContentPane().add(table, BorderLayout.SOUTH);
setTitle("Test");
setPreferredSize(new Dimension(600,300));
pack();
}
private void createConnection(){
text=new JTextPane();
html=new JTextPane();
html.setContentType("text/html");
html.getStyledDocument().addDocumentListener(new DocumentListener() {
#Override
public void insertUpdate(DocumentEvent e) {
update();
}
#Override
public void removeUpdate(DocumentEvent e) {
update();
}
#Override
public void changedUpdate(DocumentEvent e) {
update();
}
private void update(){
if(fromText) return;
fromHtml=true;
text.setText(html.getText());
fromHtml=false;
}
});
text.getStyledDocument().addDocumentListener(new DocumentListener() {
#Override
public void insertUpdate(DocumentEvent e) {
update();
}
#Override
public void removeUpdate(DocumentEvent e) {
update();
}
#Override
public void changedUpdate(DocumentEvent e) {
update();
}
private void update(){
if(fromHtml) return;
fromText=true;
html.setText(text.getText());
fromText=false;
}
});
}
public static void main(String[] args) {
java.awt.EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
new TestEditor().setVisible(true);
}
});
}
private JTextPane text;
private JTextPane html;
private boolean fromHtml, fromText;
private JButton table;
}
However, this inserts a table in the wrong place, most often after the ending tag </html>. My goal is to insert the table in the place in which caret is on the right editor.
What should I do? How to detect the proper position?

I tested your code, and it fails when you are editing the styled document, but it works when you edit the text document. The reason is simple: when a call to update() occurs, the use of setText() puts the caret at the end of the document. The html code is then naturally inserted at the end.
So ideally you would want to keep track of the caret position and cleverly update it after setText(). But this is not easy: How do you manage inserted or removed text?
So here is a proposal: When the "add table" button is clicked, detect which editor has focus (= where the caret position is relevant), and insert the html code in the corresponding one.
However, inserting html code in the styled document will be done slightly differently (to avoid being escaped):
HTMLEditorKit kit = (HTMLEditorKit) html.getEditorKit();
HTMLDocument doc = (HTMLDocument) html.getStyledDocument();
kit.insertHTML(doc, html.getCaretPosition(), builder.toString(), 0, 0, null);
So you should get something like that:
Component c = getFocusOwner();
if(c==html){
HTMLEditorKit kit = (HTMLEditorKit) html.getEditorKit();
HTMLDocument doc = (HTMLDocument) html.getStyledDocument();
kit.insertHTML(doc, html.getCaretPosition(), builder.toString(), 0, 0, null);
}else if(c==text){
text.getStyledDocument().insertString(text.getCaretPosition(), builder.toString(), null);
}
Also, make the button unfocusable to avoid getFocusOwner() to detect the button click:
table.setFocusable(false);

changing the value of a text field as another is changed and the same but reversed causing an error

I am making a simple Miles-Kilometers converter that updates automatically as you type. The problem is that is that an error is thrown somewhere. I believe that this is because as i change one of the fields it handles the event and changes the other field but since that also has an event handler for when it is changed it tries to change the other field itself and they keep firing events back and forth until something somewhere explodes. Any idea how I can fix this or is there a different problem completely ?
Here's my code:
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
public class Book extends JFrame{
private JTextField jtfKilometers = new JTextField(10);
private JTextField jtfMiles = new JTextField(10);
public Book(){
setLayout(new BorderLayout(10, 0));
JPanel jlblPanel = new JPanel(new GridLayout(2, 0, 50, 5));
jlblPanel.add(new JLabel("Kilometers"));
jlblPanel.add(new JLabel("Miles"));
add(jlblPanel, "West");
JPanel jtfPanel = new JPanel(new GridLayout(2, 0, 5, 5));
jtfPanel.add(jtfKilometers);
jtfPanel.add(jtfMiles);
add(jtfPanel, "Center");
jtfKilometers.getDocument().addDocumentListener(new DocumentListener(){
#Override
public void insertUpdate(DocumentEvent e) {
if(jtfKilometers.getText().equals("")){
jtfMiles.setText("");
}else{
jtfMiles.setText(Double.parseDouble(jtfKilometers.getText()) * 0.621371 + "");
}
}
#Override
public void removeUpdate(DocumentEvent e) {
insertUpdate(e);
}
#Override
public void changedUpdate(DocumentEvent e) {
insertUpdate(e);
}
});
jtfMiles.getDocument().addDocumentListener(new DocumentListener(){
#Override
public void insertUpdate(DocumentEvent e) {
if(jtfMiles.getText().equals("")){
jtfKilometers.setText("");
}else{
jtfKilometers.setText(Double.parseDouble(jtfMiles.getText()) * 1.60934 + "");
}
}
#Override
public void removeUpdate(DocumentEvent e) {
insertUpdate(e);
}
#Override
public void changedUpdate(DocumentEvent e) {
insertUpdate(e);
}
});
}
public static void main(String[] args){
Book f = new Book();
f.setDefaultCloseOperation(MyFrame.EXIT_ON_CLOSE);
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
}
}

You need to add additional guard on the focus of the text fields, so that you will be modifying only the other text field, not recursively both of them.
jtfKilometers.getDocument().addDocumentListener(new DocumentListener() {
#Override
public void insertUpdate(DocumentEvent e) {
if (jtfKilometers.hasFocus()) { // ADD THIS LINE
if (jtfKilometers.getText().equals("")) {
jtfMiles.setText("");
} else {
jtfMiles.setText(Double.parseDouble(jtfKilometers.getText()) * 0.621371 + "");
}
}
}
and similarly
jtfMiles.getDocument().addDocumentListener(new DocumentListener() {
#Override
public void insertUpdate(DocumentEvent e) {
if (jtfMiles.hasFocus()) { // ADD THIS LINE
if (jtfMiles.getText().equals("")) {
jtfKilometers.setText("");
} else {
jtfKilometers.setText(Double.parseDouble(jtfMiles.getText()) * 1.60934 + "");
}
}
}

An easy fix for this is checking if the frame has focus when the event is triggered. This will prevent the event from triggering back and forth like is happening to you now.
See the adjusted code snippet from your sample below...
public void insertUpdate(DocumentEvent e) {
if(jtfMiles.hasFocus()){//Check for focus here....repeat same check on your other "insertUpdate" method for your other frame.
if(jtfMiles.getText().equals("")){
jtfKilometers.setText("");
}else{
jtfKilometers.setText(Double.parseDouble(jtfMiles.getText()) * 1.60934 + "");
}
}
}
Hope this helps!

Unable to get JFormattedTextField to highlight on mouse click focus event

I have been trying with no luck to get a JFormattedTextField to highlight on mouse click. I have been able to get it to work fine while tabbing through fields, however I would like to highlight everything on clicking.
I am only able to highlight on mouse click if I click and hold for about 1.5-2 seconds on the text field; I have no idea why.
I've searched and tried a few fixes including extending the class;
class HFTextField extends JFormattedTextField
{
HFTextField(MaskFormatter formatter)
{
super(formatter);
}
#Override
protected void processFocusEvent(FocusEvent e)
{
super.processFocusEvent(e);
if (e.getID() == FocusEvent.FOCUS_GAINED)
{
this.selectAll();
}
}
}
I am also defining a (rather verbose!) FocusListener which uses SwingUtilities.invokelater;
public static FocusListener CreateHighlightTextFieldFocusListener(final JTextField text_field)
{
FocusListener fl =
new FocusAdapter()
{
public void focusGained(FocusEvent evt)
{
SwingUtilities.invokeLater(new Runnable()
{
#Override
public void run()
{
text_field.selectAll();
}
});
}
};
return fl;
}
and this is the function that creates formatted text fields;
public static JTextField CreateFormattedTextField(int x, int y, int width, int height,
Method action_method, Method changed_method, Method remove_method,
Method update_method, String mask_formatter, String banned_chars)
{
MaskFormatter formatter = null;
try {
formatter = new MaskFormatter(mask_formatter);
} catch (ParseException e) {
assert(false);
}
if(banned_chars != null)
formatter.setInvalidCharacters(banned_chars);
JTextField text_field = new HFTextField(formatter);
text_field.setBounds(x, y, width, height);
if(action_method != null)
{
text_field.addActionListener(CreateTextFieldActionListener(action_method, text_field));
}
text_field.getDocument().addDocumentListener(
CreateTextFieldDocumentListener(changed_method, remove_method,
update_method, text_field));
text_field.addFocusListener(CreateHighlightTextFieldFocusListener(text_field));
return text_field;
Any help would be greatly appreciated!

maybe you have got problems with EDT,
how method you use for/how you added value to JTextField
works with JTextField, JFormateddTextField, with JComboBox too, and with AutoCompleted funcionalies http://www.java2s.com/Code/Java/Swing-JFC/AutocompleteTextField.htm
private FocusListener focsListener = new FocusListener() {
#Override
public void focusGained(FocusEvent e) {
dumpInfo(e);
}
#Override
public void focusLost(FocusEvent e) {
//dumpInfo(e);
}
private void dumpInfo(FocusEvent e) {
//System.out.println("Source : " + name(e.getComponent()));
//System.out.println("Opposite : " + name(e.getOppositeComponent()));
//System.out.println("Temporary: " + e.isTemporary());
Component c = e.getComponent();
if (c instanceof JFormattedTextField) {
((JFormattedTextField) c).requestFocus();
((JFormattedTextField) c).setText(((JFormattedTextField) c).getText());
((JFormattedTextField) c).selectAll();
} else if (c instanceof JTextField) {
((JTextField) c).requestFocus();
((JTextField) c).setText(((JTextField) c).getText());
((JTextField) c).selectAll();
}
}
private String name(Component c) {
return (c == null) ? null : c.getName();
}
};

Try the following code
yourTextField.addFocusListener(new java.awt.event.FocusAdapter() {
public void focusGained(java.awt.event.FocusEvent evt) {
SwingUtilities.invokeLater( new Runnable() {
#Override
public void run() {
yourTextField.selectAll();
}
});
}
});

I hate to give a simple answer, but have you tried using the MouseListener interface (or MouseAdapter class)?
Have you tried something like this:
fieldName.addMouseListener(new MouseAdapter() {
#Override
public void mousePressed(MouseEvent e) {
JTextComponent text = (JTextComponent) e.getSource();
text.selectAll();
}
});
Also, I would not recommend doing this asynchronously.

If you want specialized behavior for a mouse click, then add a MouseAdapter to your JTextFiled, and in the mouseClicked event handler, explicitly alter the background.

basically you can use this code (not sure that for each formatter and input masks), but for Number, Date and String you can use following, with ensure that this JFormattedTextField doesn't implements AutoCompleted
myTextField.addFocusListener(new FocusListener() {
#Override
public void focusGained(FocusEvent e) {
myTextField.requestFocus();
myTextField.setText(myTextField.getText());
myTextField.selectAll();
}
#Override
public void focusLost(FocusEvent e) {
}
});
sure you can pack that into InvokeLate...