Java : JFormattedTextField change setGroupingUsed() on focusLost & focusGained

Question

I have many JFormattedTextdields with number data in it. I have used DecimalFormat, InternationalFormatter, DocumentListener and also tried with CaretPositionListener.

The only problem I face is caret position when number input grows and grouping character comes in between.

How can I dynamically set setGroupingUsed() of DecimalFormat of respective jformattedtextfields on focusGained & onFocusLost.

Any ideas or suggestions....

UPDATE CODE & PROBLEM : When I try to input "12345", on adding "1234" a comma appears "1,234". This brings to caret between 3 & 4 instead of after 4. The Formatting code I use :

    DecimalFormat numberFormat = (DecimalFormat) DecimalFormat.getNumberInstance();
    numberFormat.setMaximumFractionDigits(2);
    numberFormat.setMinimumFractionDigits(2);
    numberFormat.setRoundingMode(RoundingMode.HALF_UP);

    final InternationalFormatter formatter = new InternationalFormatter(numberFormat);
    formatter.setAllowsInvalid(false);
    formatter.setMinimum(0.00);
    formatter.setMaximum(999999999.99);

    return formatter;

This is what I have implemented as SOLUTION on a custom JFormattedTextField. Do you have any better approach to handle the grouping character while inputting value, so just caret position remains proper :

    public void focusGained(FocusEvent e) {
    if (numberFormat.isGroupingUsed()) {
        Object o = this.getValue();
        numberFormat.setGroupingUsed(false);
        formatter.setFormat(numberFormat);
        this.setFormatterFactory(new AbstractFormatterFactoryImpl());
        this.setValue(o);
        this.setText(o.toString());
    }
}

public void focusLost(FocusEvent e) {
    try {
        this.commitEdit();
    } catch (ParseException ex) {
        //Logger.getLogger(NumberFormattedTextField.class.getName()).log(Level.SEVERE, null, ex);
    }
    Object o = this.getValue();
    //System.out.println("focusLost : getValue = " + o);
    numberFormat.setGroupingUsed(true);
    formatter.setFormat(numberFormat);
    this.setFormatterFactory(new AbstractFormatterFactoryImpl());
    this.setValue(o);
    this.setText(o.toString());
    //System.out.println("focusLost : Text Set = " + o.toString());
}

Answer 1

Thanks,

I solved by creating a custom textfield that manages everything I need. Any suggestion for improvements. Code is added above in question.