Application: gvSIG desktop

package org.gvsig.gui.beans.controls.comboscale;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.text.NumberFormat;

import java.util.ArrayList;

import java.util.Iterator;

import javax.swing.DefaultComboBoxModel;

import javax.swing.JComboBox;

import javax.swing.JLabel;

import javax.swing.JPanel;

import org.gvsig.gui.beans.controls.IControl;

import java.awt.FlowLayout;

public class ComboScale extends JPanel implements IControl {

        private JLabel jLabel = null;

        private JComboBox jComboBox = null;

        private ArrayList actionCommandListeners = new ArrayList();

        // private Long[] scales;

        private boolean bDoCallListeners = true;

        static private int eventId = Integer.MIN_VALUE;

        // jaume

        private class ComboScaleItem {

                private long value;

                public ComboScaleItem(long itemScale) {

                        this.value = itemScale;

                }

                public String toString() {

                        return NumberFormat.getNumberInstance().format(value);

                }

                public boolean equals(Object obj) {

                        return obj instanceof ComboScaleItem && ((ComboScaleItem) obj).getValue() == value;

                }

                public long getValue() {

                        return value;

                }

        }

        /**

         * This is the default constructor

         */

        public ComboScale() {

                super();

                initialize();

        }

        /**

         * This method initializes this

         *

         * @return void

         */

        private void initialize() {

                FlowLayout flowLayout = new FlowLayout();

                flowLayout.setHgap(0);

                flowLayout.setVgap(0);

                jLabel = new JLabel();

                jLabel.setText("1:");

                this.setLayout(flowLayout);

                this.setSize(155, 16);

                //this.setBorder(javax.swing.BorderFactory.createLineBorder(

                                //java.awt.Color.gray, 1));

                this.add(jLabel, null);

                this.add(getJComboBox(), null);

        }

        /**

         * This method initializes jComboBox

         *

         * @return javax.swing.JComboBox

         */

        private JComboBox getJComboBox() {

                if (jComboBox == null) {

                        jComboBox = new JComboBox();

                        jComboBox.setPreferredSize(new java.awt.Dimension(130, 16));

                        jComboBox.setEditable(true);

                        jComboBox.setMaximumRowCount(5);

                        jComboBox.setFont(new java.awt.Font("Dialog", java.awt.Font.BOLD,

                                        10));

                        jComboBox.setBackground(java.awt.SystemColor.window);

                        jComboBox

                                        .setComponentOrientation(java.awt.ComponentOrientation.LEFT_TO_RIGHT);

                        jComboBox.addActionListener(new java.awt.event.ActionListener() {

                                public void actionPerformed(java.awt.event.ActionEvent e) {

                                        if (e.getActionCommand().equals("comboBoxChanged")) {

                                                // callActionCommandListeners(((Long)jComboBox.getSelectedItem()).longValue());

                                                // setScale(((Long)jComboBox.getSelectedItem()).longValue());

                                                Object item = jComboBox.getSelectedItem();

                                                long scale;

                                                if (item instanceof String) {

                                                        StringBuffer sb = new StringBuffer((String) item);

                                                        // remove any point in the number

                                                        final String digits = "0123456789";

                                                        int i = sb.charAt(0) == '-' ? 1 : 0;

                                                        while (i < sb.length()-1) {

                                                                if (digits.indexOf(sb.charAt(i))==-1)

                                                                        sb.deleteCharAt(i);

                                                                i++;

                                                        }

                                                        jComboBox.removeItem(item);

                                                        scale = Long.parseLong(sb.toString());

                                                } else {

                                                        scale = ((ComboScaleItem) jComboBox.getSelectedItem())

                                                        .getValue();

                                                }

                                                insertScaleIfNotPresent(scale);

                                                callActionCommandListeners(scale);

                                        }

                                }

                        });

                }

                return jComboBox;

        }

        public void setItems(long[] items) {

                ComboScaleItem[] scales = new ComboScaleItem[items.length];

                for (int i = 0; i < items.length; i++) {

                        scales[i] = new ComboScaleItem(items[i]);

                }

                DefaultComboBoxModel newModel = new DefaultComboBoxModel(scales);

                getJComboBox().setModel(newModel);

        }

        /**

         * This funcion ONLY sets the text in combo. It will NOT call listeners.

         *

         * @param scale

         */

        public void setScale(long item) {

                bDoCallListeners = false;

                getJComboBox().setSelectedItem(new ComboScaleItem(item));

                bDoCallListeners = true;

        }

        /**

         * @param scale

         */

        private void insertScaleIfNotPresent(long scale) {

                // Si viene de un setScale, no insertamos la escala en el combo

                if (!bDoCallListeners)

                        return;

                DefaultComboBoxModel model = (DefaultComboBoxModel) jComboBox

                                .getModel();

                // model=new DefaultComboBoxModel();

                boolean inserted = false;

                for (int i = 0; i < model.getSize(); i++) {

                        ComboScaleItem itemScale = (ComboScaleItem) model.getElementAt(i);

                        if (scale == itemScale.getValue()) {

                                inserted = true;

                                break;

                        }

                }

                if (!inserted) {

                        for (int i = 0; i < model.getSize(); i++) {

                                ComboScaleItem itemScale = (ComboScaleItem) model.getElementAt(i);

                                if (scale < itemScale.getValue()) {

                                        model.insertElementAt(new ComboScaleItem(scale), i);

                                        inserted = true;

                                        break;

                                }

                        }

                        if (!inserted)

                                model.addElement(new ComboScaleItem(scale));

                }

                jComboBox.setSelectedItem(new Long(scale));

        }

        private void callActionCommandListeners(long scale) {

                if (!bDoCallListeners)

                        return;

                Iterator acIterator = actionCommandListeners.iterator();

                while (acIterator.hasNext()) {

                        ActionListener listener = (ActionListener) acIterator.next();

                        listener.actionPerformed(new ActionEvent(this, eventId,

                                        "CHANGE_SCALE_" + scale));

                }

                eventId++;

        }

        public void addActionListener(ActionListener listener) {

                if (!actionCommandListeners.contains(listener))

                        actionCommandListeners.add(listener);

        }

        public void removeActionListener(ActionListener listener) {

                actionCommandListeners.remove(listener);

        }

        /**

         * Returns the current selected item.

         *

         * @return The value of the selected scale, or -1 if there was an invalid

         *         value (ie. not long value).

         */

        public long getScale() {

                return ((ComboScaleItem) jComboBox.getSelectedItem()).getValue();

        }

        /**

         * Sets the label to be displayed on the left of the combo

         */

        public void setLabel(String label) {

                jLabel.setText(label);

        }

        /**

         * Gets the label

         */

        public String getLabel() {

                return jLabel.getText();

        }

        public Object setValue(Object value) {

                try {

                        long scale = Long.parseLong((String)value);

                        if (scale < 0)

                                return null;

                        ComboScaleItem item = new ComboScaleItem(scale);

                        if (item.equals(jComboBox.getSelectedItem()))

                                return item;

                        this.setScale(scale);

                        return item;

                } catch (NumberFormatException ex) {

                        // don't change the status if the provided value was not valid

                        return null;

                }

        }

} // @jve:decl-index=0:visual-constraint="10,10"