JFormattedTextField
* to display and edit numbers. Showsnull
* * * To look under the hood of this component, this class exposes * the bound properties text, value and editValid. * * @author Karsten Lentzsch * @version $Revision: 1.9 $ * * @see JFormattedTextField * @see JFormattedTextField.AbstractFormatter */ public class NumberExample { public static void main(String[] args) { try { UIManager.setLookAndFeel("com.jgoodies.looks.plastic.PlasticXPLookAndFeel"); } catch (Exception e) { // Likely Plastic is not in the classpath; ignore it. } JFrame frame = new JFrame(); frame.setTitle("Formatted :: Numbers"); frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); JComponent panel = new NumberExample() .buildPanel(); frame.getContentPane().add(panel); frame.pack(); TutorialUtils.locateOnScreenCenter(frame); frame.setVisible(true); } /** * Builds and returns a panel with a header row and the sample rows. * * @return the example panel with a header and the sample rows */ public JComponent buildPanel() { FormLayout layout = new FormLayout( "r:max(80dlu;pref), 4dlu, 45dlu, 1dlu, pref, 4dlu, pref, 0:grow"); DefaultFormBuilder builder = new DefaultFormBuilder(layout); builder.setDefaultDialogBorder(); builder.getPanel().setFocusTraversalPolicy( MyFocusTraversalPolicy.INSTANCE); Utils.appendTitleRow(builder, "Description"); List fields = appendDemoRows(builder); Utils.appendButtonBar(builder, fields, "42", "aa42"); return builder.getPanel(); } /** * Appends the demo rows to the given builder and returns the List of * formatted text fields. * * @param builder the builder used to add components to * @return the List of formatted text fields */ private List appendDemoRows(DefaultFormBuilder builder) { // The Formatter is choosen by the initial value. JFormattedTextField defaultNumberField = new JFormattedTextField(new Long(42)); // The Formatter is choosen by the given Format. JFormattedTextField noInitialValueField = new JFormattedTextField(NumberFormat.getIntegerInstance()); // Uses a custom NumberFormat. NumberFormat customFormat = NumberFormat.getIntegerInstance(); customFormat.setMinimumIntegerDigits(3); JFormattedTextField customFormatField = new JFormattedTextField(new NumberFormatter(customFormat)); // Uses a custom NumberFormatter that prints natural language strings. JFormattedTextField customFormatterField = new JFormattedTextField(new CustomNumberFormatter()); // Uses a custom FormatterFactory that used different formatters // for the display and while editing. DefaultFormatterFactory formatterFactory = new DefaultFormatterFactory(new NumberFormatter(), new CustomNumberFormatter()); JFormattedTextField formatterFactoryField = new JFormattedTextField(formatterFactory); // Wraps a NumberFormatter to map empty strings to null and vice versa. JFormattedTextField numberOrNullField = new JFormattedTextField(new EmptyNumberFormatter()); // Wraps a NumberFormatter to map empty strings to -1 and vice versa. Integer emptyValue = new Integer(-1); JFormattedTextField numberOrEmptyValueField = new JFormattedTextField(new EmptyNumberFormatter(emptyValue)); numberOrEmptyValueField.setValue(emptyValue); // Commits values on valid edit texts. DefaultFormatter formatter = new NumberFormatter(); formatter.setCommitsOnValidEdit(true); JFormattedTextField commitOnValidEditField = new JFormattedTextField(formatter); // Returns number values of type Integer NumberFormatter numberFormatter = new NumberFormatter(); numberFormatter.setValueClass(Integer.class); JFormattedTextField integerField = new JFormattedTextField(numberFormatter); Format displayFormat = new DisplayFormat(NumberFormat.getIntegerInstance()); Format typedDisplayFormat = new DisplayFormat(NumberFormat.getIntegerInstance(), true); List fields = new LinkedList(); fields.add(Utils.appendRow(builder, "Default", defaultNumberField, typedDisplayFormat)); fields.add(Utils.appendRow(builder, "No initial value", noInitialValueField, displayFormat)); fields.add(Utils.appendRow(builder, "Empty <-> null", numberOrNullField, displayFormat)); fields.add(Utils.appendRow(builder, "Empty <-> -1", numberOrEmptyValueField, displayFormat)); fields.add(Utils.appendRow(builder, "Custom format", customFormatField, displayFormat)); fields.add(Utils.appendRow(builder, "Custom formatter", customFormatterField, displayFormat)); fields.add(Utils.appendRow(builder, "Formatter factory", formatterFactoryField, displayFormat)); fields.add(Utils.appendRow(builder, "Commits on valid edit", commitOnValidEditField, displayFormat)); fields.add(Utils.appendRow(builder, "Integer Result", integerField, typedDisplayFormat)); return fields; } } validation.zip( 654 k)