Application: gvSIG desktop

/* gvSIG. Geographic Information System of the Valencian Government

 *

 * Copyright (C) 2007-2008 Infrastructures and Transports Department

 * of the Valencian Government (CIT)

 * 

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version 2

 * of the License, or (at your option) any later version.

 * 

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 * 

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, 

 * MA  02110-1301, USA.

 * 

 */

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

import java.awt.FlowLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.text.NumberFormat;

import java.util.ArrayList;

import java.util.BitSet;

import java.util.Iterator;

import java.util.List;

import javax.swing.DefaultComboBoxModel;

import javax.swing.JComboBox;

import javax.swing.JLabel;

import javax.swing.JPanel;

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

public class ComboScale extends JPanel implements IControl {

    private static final long serialVersionUID = 6483498713300082876L;

    private JLabel jLabel = null;

    private JComboBox jComboBox = null;

    private List<ActionListener> actionCommandListeners =

        new ArrayList<ActionListener>();

    private boolean bDoCallListeners = true;

    private boolean isScaleCombo;

    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.CENTER, 0, 0);

        jLabel = new JLabel();

        jLabel.setText("1:");

        this.setLayout(flowLayout);

        // this.setSize(155, 16);

        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.setEditable(true);

            jComboBox.setMaximumRowCount(5);

            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 = 0;

                        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;

                            BitSet deleteChars = new BitSet();

                            while (i < sb.length()) {

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

                                    deleteChars.set(i);

                                i++;

                            }

                            for (int k = deleteChars.size(); k >= 0; k--) {

                                if (deleteChars.get(k))

                                    sb.deleteCharAt(k);

                            }

                            jComboBox.removeItem(item);

                            try {

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

                            } catch (NumberFormatException e1) {

                            }

                        } 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 ComboScaleItem(scale));

        isScaleCombo = true;

    }

    private void callActionCommandListeners(long scale) {

        if (!bDoCallListeners)

            return;

        Iterator<ActionListener> acIterator = actionCommandListeners.iterator();

        while (acIterator.hasNext()) {

            ActionListener listener = 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) {

        if (isScaleCombo) {

            isScaleCombo = false;

            return null;

        }

        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;

        }

    }

    public void setEnabled(boolean enabled) {

        boolean oldEnabled = jComboBox.isEnabled();

        jComboBox.setEnabled(enabled);

        jComboBox.firePropertyChange("enabled", oldEnabled, enabled);

        if (enabled != oldEnabled) {

            jComboBox.repaint();

        }

    }

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