I have a lot of different JFormattedTextFields with action and keylisteners. Every Field has a keylistener, so when I press enter I will focus the next JFormattedTextField. The Problem is, for some JFormattedTextFields my code is formatting the input and then sets the text new and for those selectAll() does not work.
JFormattedTextField a = new JFormattedTextField(someDouble);
JFormattedTextField b = new JFormattedTextField(someDouble2);
a.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
leasingfaktor1Field.selectAll();
if(...) {
//do something
a.setText(tausenderPunkt(someValue));
}
}
});
a.addKeyListener(new KeyAdapter() {
public void keyPressed(KeyEvent e) {
if (e.getKeyCode() == 10) {
b.requestFocusInWindow();
}
}
});
b.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
leasingfaktor1Field.selectAll();
if(...) {
//do something
b.setText(tausenderPunkt(someValue));
}
}
});
b.addKeyListener(new KeyAdapter() {
public void keyPressed(KeyEvent e) {
if (e.getKeyCode() == 10) {
c.requestFocusInWindow();
}
}
});
The function tausenderPunkt():
public String tausenderPunkt(double value) {
String s = String.format("%1$,.2f", value);
return s;
}
So when my cursor is in field a and i press enter the cursor goes to field b but does not select the text or values. When i do not use setText() i do not have the problem. Somebody has a solution?
Edit: For some JFormattedTextFields the solution was to add selectAll() to the keyAdapter, but not for all.
For example:
b.addKeyListener(new KeyAdapter() {
public void keyPressed(KeyEvent e) {
if (e.getKeyCode() == 10) {
c.requestFocusInWindow();
c.selectAll();
}
}
});
Edit2:
The problem seems to be when i create the JFormattedTextFields.
When i do not create them with a value in the constructor it works.
But i have to do.
Before moving to your next text field you should consider handling all the required conditions for the text field you are currently focused on and this would of course include the formatting of values or text supplied to that field. Once all the desired conditions are met then move on to the next text field.
In reality this can all be accomplished through the keyPressed event for your particular situation. There is no need for the actionPerformed event on any of your text fields, for example:
a.addKeyListener(new KeyAdapter() {
#Override
public void keyPressed(KeyEvent e) {
if (e.getKeyCode() == KeyEvent.VK_ENTER) {
checkConditions(a, b);
}
}
});
b.addKeyListener(new KeyAdapter() {
#Override
public void keyPressed(KeyEvent e) {
if (e.getKeyCode() == KeyEvent.VK_ENTER) {
checkConditions(b, c);
}
}
});
//---------- and so on -------------
Here is a simple method so as to eliminate the need for repetitious code:
private void checkConditions(JFormattedTextField fieldA, JFormattedTextField fieldB) {
// Make sure something is contained within fieldA and
// that it's actually numerical text.
if(!fieldA.getText().isEmpty() &&
fieldA.getText().matches("([-]?)\\d+([,]\\d+)?(([.]\\d+)?)")) {
// Convert the supplied text to Double and
// ensure the desired numerical formating.
String res = (String)tausenderPunkt(Double.parseDouble(fieldA.getText().replace(",","")));
fieldA.setText(res);
// Set Focus to our next text fieldB.
fieldB.requestFocusInWindow();
// Highlight the contents (if any) within the
// next text fieldB.
fieldB.selectAll();
}
// If fieldA is empty or fieldA does not contain
// numerical text then inform User and re-highlight
// the entry in fieldA.
else {
JOptionPane.showMessageDialog (null, "Please Enter Numerical Values Only!",
"Incorrect Entry", JOptionPane.WARNING_MESSAGE);
fieldA.selectAll();
}
}
If you want the contents of your first text field to be highlighted as soon as focus has been established upon it (tabbed to or clicked on) then consider using a FocusGained event for that component or any other component where you desire the same effect.
I Hope this has helped in some way.
EDITED!
So as to handle OP's particular situation.
String str=this.getText();
this.setText(str);
this.selectAll();
You can get the focus owner and remove the focusable feature:
Component focusOwner = FocusManager.getCurrentManager().getFocusOwner();
When you get the component, put this sentence after load it:
component.setFocusable(false);
Related
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) {
}
}
I have two JFrames, when clicked on a textField in Parent form a small form appears with focus on it's textField, on process when this current form disappears, I want to get focus back on the Parent form's textField, that is explained in the images below, how can I do that?
IMAGE
Wha I did is tried to take focus by requestFocus() method to Parent form's textField as below!
CODE FOR SMALL WINDOW
quantityField.addKeyListener(new KeyListener() {
#Override
public void keyTyped(KeyEvent e) {
}
#Override
public void keyPressed(KeyEvent e) {
}
#Override
public void keyReleased(KeyEvent e) {
if (e.getKeyCode() == KeyEvent.VK_ENTER && priceField.getText().length() > 0) {
if (containsOnlyNumbers(priceField.getText())) {
productPrice = Double.parseDouble(priceField.getText());
productQuantity = Double.parseDouble(quantityField.getText());
TaxInfo tax = taxeslogic.getTaxInfo(oProduct.getTaxCategoryID(), m_oTicket.getCustomer());
addTicketLine(new TicketLineInfo(oProduct, productQuantity, productPrice, tax, (java.util.Properties) (oProduct.getProperties().clone())));
status = true;
jProductList.requestFocusInWindow();
frame.dispose();
} else {
JOptionPane.showMessageDialog(null, "Invalid value entered!", "Error", JOptionPane.ERROR_MESSAGE);
}
} else if (e.getKeyCode() == KeyEvent.VK_ESCAPE) {
TaxInfo tax = taxeslogic.getTaxInfo(oProduct.getTaxCategoryID(), m_oTicket.getCustomer());
addTicketLine(new TicketLineInfo(oProduct, dMul, dPrice, tax, (java.util.Properties) (oProduct.getProperties().clone())));
status = true;
jProductList.requestFocusInWindow();
frame.dispose();
}
}
});
CODE FOR PARENT FORM
jProductList.getEditor().getEditorComponent().addKeyListener(new KeyListener() {
#Override
public void keyTyped(KeyEvent e) {
}
#Override
public void keyPressed(KeyEvent e) {
}
#Override
public void keyReleased(KeyEvent e) {
if (e.getKeyCode() == KeyEvent.VK_ENTER) {
if (jProductList.getSelectedIndex() < 0) {
//Do nothing
} else {
//Add product into list
m_returnObj = (ProductInfoExt) product.getProductDetail(product.getProductCode(jProductList.getSelectedItem().toString()));
jProductList.setSelectedIndex(-1);
if (addTicketLine(m_returnObj, 1.0, m_returnObj.getPriceSell())) {
System.out.println("Requesting focus");
jProductList.requestFocusInWindow();
}
//jProductList.requestFocus();
}
}
}
});
WHERE jProductList is the Parent form's textField I need to get focus on!
I have two JFrames,
An application should only have a single JFrame. In your case the child window should be a modal JDialog.
when clicked on a textField in Parent form a small form appears
Don't use a KeyListener.
You should add an ActionListener to the text field in the parent form. The ActionListener will be invoked when the Enter key is pressed.
Focus will then automatically go back to the text field when the modal dialog is closed.
In the child form you again should not be using a KeyListener. You can again add an ActionListener to the text field. To handle the Escape key you should be using Key Bindings.
I'm working on a Java assignment that has to be done using AWT. I want a button to trigger by pushing the enter key while the button is in focus. I figured out how to do this in Swing with the doClick() method, but this doesn't seem to work in AWT. So far I'm trying this:
button.addActionListener(this); // Passes value from a TextBox to actionPerformed()
button.addKeyListener(new KeyAdapter() {
public void keyPressed(KeyEvent e) {
if(e.getKeyCode()==KeyEvent.VK_ENTER) {
actionPerformed(null);
}
}
});
public void actionPerformed (ActionEvent e) {
try {
if (e.getSource() == button) {
// Stuff I want to happen
} else if (e.getSource() == anotherButton) {
// Other Stuff
} else { //third button
// More stuff
}
} catch (NumberFormatException nfe) {
// Null argument in keyPressed triggers this
// catches empty string exception from TextBox
}
}
As I mentioned with the comments, the null argument will trigger the catch. Does anyone have any idea what that argument might be for the button press or perhaps an altogether easier way to go about this? Thanks.
Edit - clarification: actionPerformed() does one of three things with input from a TextBox depending on which of three buttons is clicked. The try/catch is to catch empty string/format exceptions.
You can always have a method called something like onButtonPress(), which your actionPerformed can call, as well as your keyPressed.
button.addActionListener(this);
button.addKeyListener(new KeyAdapter() {
public void keyPressed(KeyEvent e) {
if(e.getKeyCode() == KeyEvent.VK_ENTER) {
onButtonPress();
}
}
});
public void actionPerformed (ActionEvent e) {
if (e.getSource() == button){
onButtonPress();
}
}
private void onButtonPress(){
// do something
}
I've added a keylistener to my JTextArea field, but it doesn't behave as I expected.
inputTextArea.addKeyListener(new KeyAdapter() {
public void keyPressed(KeyEvent k) {
//If the return button is hit, only set to a new line if shift is also down.
if(k.getKeyChar() == KeyEvent.VK_ENTER) {
if(k.isShiftDown()) {
inputTextArea.append(" \n");
} else {
//Send The Message...
boolean cleanTextField = false;
try {
sendMessage(inputTextArea.getText());
cleanTextField = true;
msgScrollPane.setAutoscrolls(true);
JScrollBar vbar = msgScrollPane.getVerticalScrollBar();
if ((vbar.getValue() + vbar.getVisibleAmount()) == vbar.getMaximum()) {
msgPane.setCaretPosition(msgDoc.getLength());
}
} catch (Exception ex) {
ex.printStackTrace();
cleanTextField = false;
} finally {
if(cleanTextField) {
inputTextArea.setText("");
}
}
}
}
}
});
I want this:
- If the return button is hit and shift is down: add a new line.
- If the return button is hit and the shift button isn't down: no new line, but submit.
Now it behaves like this:
- If I hit the return button and shift is down: no line added. Nothing happens.
- If I hit the return button and shift isn't down: submitted, but if I start typing again it begins on new line.
Does someone know how to do what I want?
EDIT:
I tried some other code to detect if the shift button is down:
if((k.getModifiersEx() == KeyEvent.SHIFT_DOWN_MASK) ||
(k.getModifiers() == KeyEvent.SHIFT_DOWN_MASK)) {
This doesn't work as well
You may use the InputMap and ActionMap of the JTextArea to map the key strokes to actions:
private static final String TEXT_SUBMIT = "text-submit";
private static final String INSERT_BREAK = "insert-break";
...
private void initialize() {
InputMap input = inputTextArea.getInputMap();
KeyStroke enter = KeyStroke.getKeyStroke("ENTER");
KeyStroke shiftEnter = KeyStroke.getKeyStroke("shift ENTER");
input.put(shiftEnter, INSERT_BREAK); // input.get(enter)) = "insert-break"
input.put(enter, TEXT_SUBMIT);
ActionMap actions = inputTextArea.getActionMap();
actions.put(TEXT_SUBMIT, new AbstractAction() {
#Override
public void actionPerformed(ActionEvent e) {
submitText();
}
});
}
...
private void submitText() {
// TODO
}
The original action for ENTER - "insert-break" - is used for shift ENTER.
Try using keyTyped and not keyPressed. I beleive keyPressed gives you an event for the shift and for the enter, whereas keyTyped gives you one combined event with a modifier.
Instead of doing the actions immediately on receiving the event, sequence them for later by posting them using SwingUtilities.invokeLater(). The code should look like:
if(k.isShiftDown()) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
inputTextArea.append(" \n");
}
});
} else {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
//rest of the else body here
}
});
}
In my opinion, the problems seen here are because application-defined actions and internal actions are not being properly sequenced, leading to repaints happening before the text has been modified.
What's the best way to get a value of a TextArea after a key is typed, including this character?
If I do it in the even listener, textarea.getText() returns the value without the eventual new char.
Basically I see two ways:
postponing processing with something like invokeLater(). I would prefer a solution without threads.
figuring out where to put the char into the text, based on the carret position.
Is there any other, simpler?
Thanks.
Edit: This is what I have:
JTextArea textarea = (JTextArea) evt.getComponent();
String texySource = textarea.getText();
char keyCode = evt.getKeyChar();
//if( Character.isLetterOrDigit( keyCode ) || Character.isSpaceChar( keyCode ) )
if( keyCode >= 0x20 || keyCode == 0x0A || keyCode == 0x0D ){
// TODO: The carret doesn't have to be at the end...
//texySource += Character.toString( evt.getKeyChar() );
String ch = Character.toString( evt.getKeyChar() );
texySource = StringUtils.overlay(texySource, ch,
textarea.getSelectionStart(),
textarea.getSelectionStart() );
}
Have you considered a document listener? possibly armed by the typing event?
class TheListener implements DocumentListener, KeyListener {
boolean armed;
void keyPressed(KeyEvent ignore) { }
void keyReleased(KeyEvent ignore) { }
void keyTyped(KeyEvent e) {
armed = true;
SwingUtilities.invokeLater(new Runnable() { public void run() {
armed = false;
}
}
void deleteUpdate(DocumentEvent e) {
changeUpdate(e);
}
void insertUpdate(DocumentEvent e) {
changeUpdate(e);
}
void changedUpdate(DocumentEvent e) {
if (armed) {
String s = ((JTextComponent)e.getSource()).getText();
//.... whatever you want to do now
}
}
}
//...
TheListener aListener = new TheListener();
textArea.addKeyListener(aListener);
textArea.getDocument().addDocumentListener(aListener);
The theory is to arm the document change listener on a key typed, then add an EDT event to disarm it. The document changes will occur first before disarmed. Once armed, you can assume that any document changes were caused in some part by the key typing event. (warning, I haven't compiled this code, YMMV).
You need to use a DocumentListener and wirte your code in one of the xxxupdate() methods.
Have you tried registering a KeyListener with a custom implementation of keyReleased(KeyEvent e) ?
check the api here: KeyListener
sun's tutorial with examples: How to write a Key Listener