Application: gvSIG desktop » gvSIG Document Layout

package org.gvsig.app.project.documents.layout.fframes.gui.numberFormat;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.text.DecimalFormat;

import java.text.DecimalFormatSymbols;

import javax.swing.JComboBox;

import javax.swing.JLabel;

import org.gvsig.gui.beans.swing.GridBagLayoutPanel;

import org.gvsig.gui.beans.swing.JNumberSpinner;

import org.gvsig.i18n.Messages;

/**

 * A panel to select the format for a decimal number. The following options are

 * offered:

 * <ul>

 * <li>The decimal separator character</li>

 * <li>The thousands separator character</li>

 * <li>The number of decimal digits. Note that this component forces the

 * maximum and minimum number of decimal digits (as defined in {@link DecimalFormat})

 * to be always equal.</li>

 * </ul>

 * 

 * @author Cesar Martinez Izquierdo

 */

public class DecimalFormatPanel extends GridBagLayoutPanel {

        private static final long serialVersionUID = 1L;

        public static final String INTEGER_BASE_PATTERN = "0";

        public static final String INTEGER_GROUPED_BASE_PATTERN = "#,###,###,###,###,###,##0";

        public static final String DECIMAL_BASE_PATTERN = "#0.";

        public static final String DECIMAL_GROUPED_BASE_PATTERN = "#,###,###,###,###,###,##0.";

        private DecimalFormat format;

        private CharComboBox cbDecimalSep = null;

        private CharComboBox cbThousandsSep = null;

        private JNumberSpinner tfDecimalDigits = null; 

        private JLabel lbResult = null;

        private double testNumber = 123456789.00;

        private static final DecimalFormatSymbols defaultLocaleSymbols = DecimalFormatSymbols.getInstance();

        /**

         * Creates and initializes the panel using the default format

         *  for the current locale

         */

        public DecimalFormatPanel() {

                this(new DecimalFormat());

        }

        /**

         * Creates and initializes the panel using the provided

         * DecimalFormat 

         */

        public DecimalFormatPanel(DecimalFormat format) {

                super();

                initComponents();

                setFormat(format);

        }

        /**

         * Creates and initializes the panel using the provided parameters

         * 

         * @param decimalSeparator The character used to separate the decimal part

         * @param thousandsSeparator The character used to group thousands

         * @param decimalDigits The number of decimal digits to show

         * @param basePattern A base pattern used to create the DecimalFormat.

         * Usually, one of {@link #INTEGER_BASE_PATTERN},

         * {@link #INTEGER_GROUPED_BASE_PATTERN}, {@link #DECIMAL_BASE_PATTERN}

         * or {@link #DECIMAL_GROUPED_BASE_PATTERN}.

         * Any decimal digits in the pattern will be ignored (as they will be

         * included depending on the <code>decimalDigits</code> parameter). The

         * behavior of the component is undefined if a wrong pattern is provided

         * 

         * @see DecimalFormat

         */

        public DecimalFormatPanel(char decimalSeparator, char thousandsSeparator, int decimalDigits, String basePattern) {

                super();

                initComponents();

                DecimalFormatSymbols sym = new DecimalFormatSymbols();

                sym.setDecimalSeparator(decimalSeparator);

                sym.setGroupingSeparator(thousandsSeparator);

                String pattern = getPattern(basePattern, decimalDigits);

                DecimalFormat f = new DecimalFormat(pattern, sym);

                setFormat(f);

        }

        protected void initComponents() {

                this.addComponent(Messages.getText("Decimal_separator"), getCbDecimalSep());

                this.addComponent(Messages.getText("Thousands_separator"), getCbThousandsSep());

                this.addComponent(Messages.getText("Decimal_digits"), getTfDecimalDigits());

                this.addComponent(Messages.getText("Result"), getLbTestResult());

        }

        private String getPattern(String basePattern, int decimalDigits) {

                int pos = basePattern.indexOf('.');

                if (pos>=0) {

                        basePattern = basePattern.substring(0, pos+1);

                }

                if (decimalDigits>0) {

                        return basePattern + String.format(("%1$0"+decimalDigits+"d"),0);

                }

                else {

                        return basePattern;

                }

        }

        private CharComboBox getCbDecimalSep() {

                if (cbDecimalSep==null) {

                        cbDecimalSep = new CharComboBox(new String[]{".", ","}, false);

                        cbDecimalSep.addActionListener(new ActionListener() {

                                public void actionPerformed(ActionEvent e) {

                                        if (e.getSource() instanceof CharComboBox) {

                                                DecimalFormatPanel.this.updateFormat(e.getSource());

                                        }

                                }

                        });

                }

                return cbDecimalSep;

        }

        private CharComboBox getCbThousandsSep() {

                if (cbThousandsSep==null) {

                        cbThousandsSep = new CharComboBox(new String[]{",", ".", " "}, true);

                        cbThousandsSep.addActionListener(new ActionListener() {

                                public void actionPerformed(ActionEvent e) {

                                        if (e.getSource() instanceof CharComboBox) {

                                                DecimalFormatPanel.this.updateFormat(e.getSource());

                                        }

                                }

                        });

                }

                return cbThousandsSep;

        }

        protected void updateFormat(Object source) {

                // get selected values

                String thousandsSeparator = getCbThousandsSep().getSelectedItem();

                String decimalSeparator = getCbDecimalSep().getSelectedItem();

                int decimalDigits = getTfDecimalDigits().getInteger();

                boolean b_decimalSep, b_thousandsSep;

                DecimalFormatSymbols sym = format.getDecimalFormatSymbols();

                if (decimalSeparator!=null && decimalSeparator.length()>0) {

                        sym.setDecimalSeparator(decimalSeparator.charAt(0));

                        b_decimalSep = true;

                }

                else {

                        b_decimalSep = false;

                }

                if (thousandsSeparator!=null &&

                                thousandsSeparator!=getCbThousandsSep().getNoneItem() &&

                                thousandsSeparator.length()>0) {

                        sym.setGroupingSeparator(thousandsSeparator.charAt(0));

                        b_thousandsSep = true;

                }

                else {

                        b_thousandsSep = false;

                }

                // choose the right pattern

                String pattern = null;

                if (b_decimalSep && decimalDigits>0) {

                        if (b_thousandsSep) {

                                pattern = getPattern(DECIMAL_GROUPED_BASE_PATTERN, decimalDigits);

                        }

                        else {

                                pattern = getPattern(DECIMAL_BASE_PATTERN, decimalDigits);

                        }

                }

                else {

                        if (b_thousandsSep) {

                                pattern = INTEGER_GROUPED_BASE_PATTERN;

                        }

                        else {

                                pattern = INTEGER_BASE_PATTERN;

                        }

                }

                // update the format

                this.format = new DecimalFormat(pattern, sym);

                getLbTestResult().setText(this.format.format(testNumber));

                // set coherent options in UI

                if (source==getCbDecimalSep()) {

                        if (!b_decimalSep) {

                                // if no decimal separator is shown at all, we can't

                                // have any decimal digit

                                getTfDecimalDigits().setInteger(0);

                        }        

                }

                else {

                        if (decimalDigits>0 && !b_decimalSep) {

                                selectItem(getCbDecimalSep(), String.valueOf(defaultLocaleSymbols.getDecimalSeparator()));

                        }

                }

        }             

        private JNumberSpinner getTfDecimalDigits() {

                if (tfDecimalDigits==null) {

                        tfDecimalDigits = new JNumberSpinner(0, 2, 0, 100, 1);

                        tfDecimalDigits.addActionListener(new ActionListener() {

                                public void actionPerformed(ActionEvent e) {

                                        DecimalFormatPanel.this.updateFormat(e.getSource());

                                }

                        });

                }

                return tfDecimalDigits;

        }

        private JLabel getLbTestResult() {

                if (lbResult==null) {

                        lbResult = new JLabel();

                }

                return lbResult;

        }

        public DecimalFormat getFormat() {

                return format;

        }

        public void setFormat(DecimalFormat format) {

                this.format = format;

                boolean groupingUsed = format.isGroupingUsed();

                getTfDecimalDigits().setInteger(format.getMinimumFractionDigits());

                String decSep = String.valueOf(format.getDecimalFormatSymbols().getDecimalSeparator());

                selectItem(getCbDecimalSep(), decSep);

                if (groupingUsed) {

                        String thousandsSep = String.valueOf(format.getDecimalFormatSymbols().getGroupingSeparator());

                        selectItem(getCbThousandsSep(), thousandsSep);

                }

                else {

                        selectItem(getCbThousandsSep(), getCbThousandsSep().getNoneItem());

                }

        }

        /**

         * Adds the provided item to the combo if it is not already present,

         * then selects it.

         * 

         * @param cb

         * @param item

         * @return

         */

        private void selectItem(JComboBox cb, String item) {

                for (int i=0; i<cb.getItemCount(); i++) {

                        if (cb.getItemAt(i).equals(item)) {

                                cb.setSelectedItem(item);

                                return;

                        }

                }

                cb.addItem(item);

                cb.setSelectedItem(item);

        }

}