Examples of javax.swing.text.NumberFormatter

javax.swing.text.NumberFormatter
NumberFormatter subclasses InternationalFormatter adding special behavior for numbers. Among the specializations are (these are only used if the NumberFormatter does not display invalid numbers, for example, setAllowsInvalid(false)):
- Pressing +/- (- is determined from the DecimalFormatSymbols associated with the DecimalFormat) in any field but the exponent field will attempt to change the sign of the number to positive/negative.
- Pressing +/- (- is determined from the DecimalFormatSymbols associated with the DecimalFormat) in the exponent field will attempt to change the sign of the exponent to positive/negative.
If you are displaying scientific numbers, you may wish to turn on overwrite mode, setOverwriteMode(true). For example:
```
 DecimalFormat decimalFormat = new DecimalFormat("0.000E0"); NumberFormatter textFormatter = new NumberFormatter(decimalFormat); textFormatter.setOverwriteMode(true); textFormatter.setAllowsInvalid(false); 
```
If you are going to allow the user to enter decimal values, you should either force the DecimalFormat to contain at least one decimal (#.0###), or allow the value to be invalid setAllowsInvalid(true). Otherwise users may not be able to input decimal values.
NumberFormatter provides slightly different behavior to stringToValue than that of its superclass. If you have specified a Class for values, {@link #setValueClass}, that is one of of Integer, Long, Float, Double, Byte or Short and the Format's parseObject returns an instance of Number, the corresponding instance of the value class will be created using the constructor appropriate for the primitive type the value class represents. For example: setValueClass(Integer.class) will cause the resulting value to be created via new Integer(((Number)formatter.parseObject(string)).intValue()). This is typically useful if you wish to set a min/max value as the various Number implementations are generally not comparable to each other. This is also useful if for some reason you need a specific Number implementation for your values.
Warning: Serialized objects of this class will not be compatible with future Swing releases. The current serialization support is appropriate for short term storage or RMI between applications running the same version of Swing. As of 1.4, support for long term storage of all JavaBeans™ has been added to the java.beans package. Please see {@link java.beans.XMLEncoder}. @since 1.4

    private boolean updateMargins() {
        float x1;
        float y1;
        float x2; 
        float y2;    
        NumberFormatter format = getFloatFormatter();
    
        if (!leftTxt.isEnabled()) {
            removeAttribute(MediaPrintableArea.class);
            removeAttribute(MediaMargins.class);
            return true;
        }
    
        try {
            x1 = ((Float) format.stringToValue(leftTxt.getText())).floatValue();
            x2 = ((Float) format.stringToValue(rightTxt.getText())).floatValue();
            y1 = ((Float) format.stringToValue(topTxt.getText())).floatValue();
            y2 = ((Float) format.stringToValue(bottomTxt.getText())).floatValue();
        } catch(ParseException e) {
            return false;
        }
    
        if (sizeBox.isEnabled()

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    /*
     * Set Margins dialog fields in accordance with the given MediaMargins object
    */
    private void setMargins(MediaMargins margins) {
        NumberFormatter fmt = getFloatFormatter();
        try {
            leftTxt.setText(fmt.valueToString(
                    new Float(margins.getX1(MediaMargins.MM))));
            rightTxt.setText(fmt.valueToString(
                    new Float(margins.getX2(MediaMargins.MM))));
            topTxt.setText(fmt.valueToString(
                    new Float(margins.getY1(MediaMargins.MM))));
            bottomTxt.setText(fmt.valueToString(
                    new Float(margins.getY2(MediaMargins.MM))));
        } catch (ParseException e) {
            /* Ignore incorrect float format */
        }
    }

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    private boolean updateMargins() {
        float x1;
        float y1;
        float x2; 
        float y2;    
        NumberFormatter format = getFloatFormatter();
    
        if (!leftTxt.isEnabled()) {
            removeAttribute(MediaPrintableArea.class);
            removeAttribute(MediaMargins.class);
            return true;
        }
    
        try {
            x1 = ((Float) format.stringToValue(leftTxt.getText())).floatValue();
            x2 = ((Float) format.stringToValue(rightTxt.getText())).floatValue();
            y1 = ((Float) format.stringToValue(topTxt.getText())).floatValue();
            y2 = ((Float) format.stringToValue(bottomTxt.getText())).floatValue();
        } catch(ParseException e) {
            return false;
        }
    
        if (sizeBox.isEnabled()

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    /*
     * Set Margins dialog fields in accordance with the given MediaMargins object
    */
    private void setMargins(MediaMargins margins) {
        NumberFormatter fmt = getFloatFormatter();
        try {
            leftTxt.setText(fmt.valueToString(
                    new Float(margins.getX1(MediaMargins.MM))));
            rightTxt.setText(fmt.valueToString(
                    new Float(margins.getX2(MediaMargins.MM))));
            topTxt.setText(fmt.valueToString(
                    new Float(margins.getY1(MediaMargins.MM))));
            bottomTxt.setText(fmt.valueToString(
                    new Float(margins.getY2(MediaMargins.MM))));
        } catch (ParseException e) {
            /* Ignore incorrect float format */
        }
    }

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    private boolean updateMargins() {
        float x1;
        float y1;
        float x2; 
        float y2;    
        NumberFormatter format = getFloatFormatter();
    
        if (!leftTxt.isEnabled()) {
            removeAttribute(MediaPrintableArea.class);
            removeAttribute(MediaMargins.class);
            return true;
        }
    
        try {
            x1 = ((Float) format.stringToValue(leftTxt.getText())).floatValue();
            x2 = ((Float) format.stringToValue(rightTxt.getText())).floatValue();
            y1 = ((Float) format.stringToValue(topTxt.getText())).floatValue();
            y2 = ((Float) format.stringToValue(bottomTxt.getText())).floatValue();
        } catch(ParseException e) {
            return false;
        }
    
        if (sizeBox.isEnabled()

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/*
 * Formatter for the integer text fields
 */
public static NumberFormatter getNumberFormatter() {
    DecimalFormat format = new DecimalFormat("#####");
    NumberFormatter ret;
    format.setParseIntegerOnly(true);
    format.setDecimalSeparatorAlwaysShown(false);
    format.setMinimumIntegerDigits(0);
    format.setMaximumIntegerDigits(5);
    format.setMinimumFractionDigits(0);
    format.setMaximumFractionDigits(0);
    ret = new NumberFormatter(format);
    ret.setMinimum(new Integer(1));
    ret.setMaximum(new Integer(Integer.MAX_VALUE));
    return ret;
}

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/*
 * Formatter for the float text fields
 */
public static NumberFormatter getFloatFormatter() {
    DecimalFormat format = new DecimalFormat("###.##");
    NumberFormatter ret;
    format.setParseIntegerOnly(false);
    format.setDecimalSeparatorAlwaysShown(true);
    format.setMinimumIntegerDigits(1);
    format.setMaximumIntegerDigits(3);
    format.setMinimumFractionDigits(1);
    format.setMaximumFractionDigits(2);
    ret = new NumberFormatter(format);
    ret.setMinimum(new Float(0.0F));
    ret.setMaximum(new Float(999F));
    return ret;
}

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    }


    private AbstractFormatterFactory createFactory(final Object value) {
        DefaultFormatterFactory factory = new DefaultFormatterFactory();
        if (value instanceof Number) {
            factory.setDefaultFormatter(new NumberFormatter());
        } else if (value instanceof Date) {
            factory.setDefaultFormatter(new DateFormatter());
        } else {
            factory.setDefaultFormatter(new DefaultFormatter());
        }

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    private AbstractFormatter createFormatter(final Format format) {
        if (format instanceof DateFormat) {
            return new DateFormatter((DateFormat) format);
        } else if (format instanceof NumberFormat) {
            return new NumberFormatter((NumberFormat) format);
        } else {
            return new InternationalFormatter(format);
        }
    }

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    // use a custom formatter to have numbers with up to 64 decimals
    NumberFormat format = NumberConverters.getDefaultFormat();


    ((JFormattedTextField) editor).setFormatterFactory(
        new DefaultFormatterFactory(new NumberFormatter(format))
    );
  }

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