view/classic/Channel.java

/*
 *   JSampler - a java front-end for LinuxSampler
 *
 *   Copyright (C) 2005-2007 Grigor Iliev <grigor@grigoriliev.com>
 *
 *   This file is part of JSampler.
 *
 *   JSampler is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License version 2
 *   as published by the Free Software Foundation.
 *
 *   JSampler 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 JSampler; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 *   MA  02111-1307  USA
 */

package org.jsampler.view.classic;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Cursor;
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;

import java.awt.datatransfer.Transferable;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.HierarchyEvent;
import java.awt.event.HierarchyListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;

import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;

import java.net.URL;

import java.util.Vector;

import java.util.logging.Level;

import javax.swing.Action;
import javax.swing.AbstractAction;
import javax.swing.BorderFactory;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.JComponent;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JSeparator;
import javax.swing.JSlider;
import javax.swing.JToggleButton;
import javax.swing.JToolBar;
import javax.swing.TransferHandler;

import javax.swing.border.Border;
import javax.swing.border.LineBorder;
import javax.swing.border.TitledBorder;

import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

import net.sf.juife.InformationDialog;
import net.sf.juife.JuifeUtils;

import org.jsampler.AudioDeviceModel;
import org.jsampler.CC;
import org.jsampler.HF;
import org.jsampler.Instrument;
import org.jsampler.MidiDeviceModel;
import org.jsampler.MidiInstrumentMap;
import org.jsampler.SamplerChannelModel;
import org.jsampler.SamplerModel;

import org.jsampler.event.ListEvent;
import org.jsampler.event.ListListener;
import org.jsampler.event.MidiDeviceEvent;
import org.jsampler.event.MidiDeviceListEvent;
import org.jsampler.event.MidiDeviceListListener;
import org.jsampler.event.MidiDeviceListener;
import org.jsampler.event.SamplerAdapter;
import org.jsampler.event.SamplerChannelAdapter;
import org.jsampler.event.SamplerChannelEvent;
import org.jsampler.event.SamplerChannelListEvent;
import org.jsampler.event.SamplerChannelListListener;
import org.jsampler.event.SamplerChannelListener;
import org.jsampler.event.SamplerEvent;
import org.jsampler.event.SamplerListener;

import org.jsampler.view.std.JSChannelOutputRoutingDlg;
import org.jsampler.view.std.JSFxSendsPane;
import org.jsampler.view.std.JSInstrumentChooser;

import org.linuxsampler.lscp.AudioOutputDevice;
import org.linuxsampler.lscp.MidiInputDevice;
import org.linuxsampler.lscp.MidiPort;
import org.linuxsampler.lscp.SamplerChannel;
import org.linuxsampler.lscp.SamplerEngine;

import static org.jsampler.view.classic.ClassicI18n.i18n;


/**
 *
 * @author Grigor Iliev
 */
public class Channel extends org.jsampler.view.JSChannel {
        private final static ImageIcon iconEdit;
        
        private final static ImageIcon iconMuteOn;
        private final static ImageIcon iconMuteOff;
        private final static ImageIcon iconMutedBySolo;
        
        private final static ImageIcon iconSoloOn;
        private final static ImageIcon iconSoloOff;
        
        private final static ImageIcon iconShowProperties;
        private final static ImageIcon iconHideProperties;
        
        private static Border borderSelected;
        private static Border borderHighlighted;
        private static Border borderDeselected;
        
        private static Color chnColor;
        private static Color borderColor;
        private static Color borderHighlightedColor;
        private static Color chnSelectedColor;
        private static Color chnHighlightedColor;
        
        private final static Vector<PropertyChangeListener> propertyChangeListeners
                = new Vector<PropertyChangeListener>();
        
        static {
                iconEdit = new ImageIcon(Channel.class.getResource("res/icons/edit.png"));
                
                String path = "org/jsampler/view/classic/res/icons/";
                URL url = ClassLoader.getSystemClassLoader().getResource(path + "mute_on.png");
                iconMuteOn = new ImageIcon(url);
                
                url = ClassLoader.getSystemClassLoader().getResource(path + "mute_off.png");
                iconMuteOff = new ImageIcon(url);
                
                url = ClassLoader.getSystemClassLoader().getResource(path + "muted_by_solo.png");
                iconMutedBySolo = new ImageIcon(url);
                
                url = ClassLoader.getSystemClassLoader().getResource(path + "solo_on.png");
                iconSoloOn = new ImageIcon(url);
                
                url = ClassLoader.getSystemClassLoader().getResource(path + "solo_off.png");
                iconSoloOff = new ImageIcon(url);
                
                url = ClassLoader.getSystemClassLoader().getResource(path + "Back16.gif");
                iconShowProperties = new ImageIcon(url);
                
                iconHideProperties = Res.iconDown16;
                
                if(ClassicPrefs.getCustomChannelBorderColor())
                        setBorderColor(ClassicPrefs.getChannelBorderColor());
                else setBorderColor(ClassicPrefs.getDefaultChannelBorderColor());
                
                if(ClassicPrefs.getCustomChannelBorderHlColor())
                        setBorderHighlightedColor(ClassicPrefs.getChannelBorderHlColor());
                else setBorderHighlightedColor(ClassicPrefs.getDefaultChannelBorderHlColor());
                
                borderSelected = new LineBorder(getBorderColor(), 2, true);
                borderHighlighted = new LineBorder(getBorderHighlightedColor(), 2, true);
                borderDeselected = BorderFactory.createEmptyBorder(2, 2, 2, 2);
                
                chnColor = new JPanel().getBackground();
                
                if(ClassicPrefs.getCustomSelectedChannelBgColor()) {
                        chnSelectedColor = ClassicPrefs.getSelectedChannelBgColor();
                } else {
                        int r = chnColor.getRed() - 14 < 0 ? 0 : chnColor.getRed() - 14;
                        int g = chnColor.getGreen() - 8 < 0 ? 0 : chnColor.getGreen() - 8;
                        int b = chnColor.getBlue() - 3 < 0 ? 0 : chnColor.getBlue() - 3;
                
                        chnSelectedColor = new Color(r, g, b);
                }
                
                /*r = r + 5 > 255 ? 255 : r + 5;
                g = g + 4 > 255 ? 255 : g + 4;
                b = b + 1 > 255 ? 255 : b + 1;*/
                
                chnHighlightedColor = new Color(chnColor.getRGB());
        }
        
        /**
         * Registers the specified listener for receiving property change events.
         * @param l The <code>PropertyChangeListener</code> to register.
         */
        public void
        addPropertyChangeListener(PropertyChangeListener l) {
                propertyChangeListeners.add(l);
        }
        
        /**
         * Removes the specified listener.
         * @param l The <code>PropertyChangeListener</code> to remove.
         */
        public void
        removePropertyChangeListener(PropertyChangeListener l) {
                propertyChangeListeners.remove(l);
        }
        
        /**
         * Gets the border color that is used when the channel is selected.
         * @return The border color that is used when the channel is selected.
         */
        public static Color
        getBorderColor() { return borderColor; }
        
        /**
         * Sets the border color to be used when the channel is selected.
         * @param c The border color to be used when the channel is selected.
         */
        public static void
        setBorderColor(Color c) {
                if(borderColor != null && borderColor.getRGB() == c.getRGB()) return;
                
                Color oldColor = borderColor;
                borderColor = c;
                borderSelected = new LineBorder(getBorderColor(), 2, true);
                firePropertyChanged("borderColor", oldColor, borderColor);
        }
        
        /**
         * Gets the border color that is used when the mouse pointer is over a channel.
         * @return The border color that is used when the mouse pointer is over a channel.
         */
        public static Color
        getBorderHighlightedColor() { return borderHighlightedColor; }
        
        /**
         * Sets the border color to be used when the mouse pointer is over a channel.
         * @param c The border color to be used when the mouse pointer is over a channel.
         */
        public static void
        setBorderHighlightedColor(Color c) {
                Color oldColor = borderHighlightedColor;
                if(oldColor != null && oldColor.getRGB() == c.getRGB()) return;
                
                borderHighlightedColor = c;
                borderHighlighted = new LineBorder(getBorderHighlightedColor(), 2, true);
                firePropertyChanged("borderHighlightedColor", oldColor, borderHighlightedColor);
        }
        
        /**
         * Gets the background color that is used when a channel is selected.
         * @return The background color that is used when a channel is selected.
         */
        public static Color
        getSelectedChannelBgColor() { return chnSelectedColor; }
        
        /**
         * Sets the background color that is used when a channel is selected.
         * @param c The background color to be used when a channel is selected.
         */
        public static void
        setSelectedChannelBgColor(Color c) {
                Color oldColor = chnSelectedColor;
                if(oldColor != null && oldColor.getRGB() == c.getRGB()) return;
                
                chnSelectedColor = c;
                firePropertyChanged("selectedChannelBgColor", oldColor, chnSelectedColor);
        }
        
        /**
         * Gets the background color that is used when the mouse pointer is over a channel.
         * @return The background color that is used when the mouse pointer is over a channel.
         */
        public static Color
        getHighlightedChannelBgColor() { return chnHighlightedColor; }
        
        /**
         * Sets the background color to be used when the mouse pointer is over a channel.
         * @param c The background color to be used when the mouse pointer is over a channel.
         */
        public static void
        setHighlightedChannelBgColor(Color c) {
                Color oldColor = chnHighlightedColor;
                if(oldColor != null && oldColor.getRGB() == c.getRGB()) return;
                
                chnHighlightedColor = c;
                firePropertyChanged("highlightedChannelBgColor", oldColor, chnHighlightedColor);
        }
        
        private static void
        firePropertyChanged(String propertyName, Object oldValue, Object newValue) {
                PropertyChangeEvent e =
                        new PropertyChangeEvent(Channel.class, propertyName, oldValue, newValue);
                
                for(PropertyChangeListener l : propertyChangeListeners) l.propertyChange(e);
        }
        
        
        private final JPanel mainPane = new JPanel();
        private final ChannelProperties propertiesPane;
        private final JButton btnInstr = new InstrumentButton(i18n.getLabel("Channel.btnInstr"));
        private final Action actInstr;
        private final JButton btnEdit = new JButton(iconEdit);
        private final JButton btnMute = new JButton();
        private final JButton btnSolo = new JButton();
        private final JSlider slVolume = new JSlider(0, 100);
        private final JLabel lVolume = new JLabel();
        private final JLabel lVolImg = new JLabel(Res.iconVolume16);
        private final JLabel lStreams = new JLabel("--");
        private final JLabel lVoices = new JLabel("--");
        private final JToggleButton btnProperties = new JToggleButton();
        
        private static int count = 2;
        
        private boolean selected = false;
        private boolean mouseOver = false;
        
        
        /**
         * Creates a new instance of <code>Channel</code> using the specified
         * non-<code>null</code> channel model.
         * @param model The model to be used by this channel.
         * @throws IllegalArgumentException If the model is <code>null</code>.
         */
        public
        Channel(SamplerChannelModel model) {
                super(model);
                
                setBorder(BorderFactory.createEmptyBorder(1, 1, 1, 1));
                
                mainPane.setLayout(new BoxLayout(mainPane, BoxLayout.Y_AXIS));
                addMouseListener(getHandler());
                addHierarchyListener(getHandler());
                
                JPanel p = new JPanel();
                p.setOpaque(false);
                p.setLayout(new BoxLayout(p, BoxLayout.X_AXIS));
                p.setBorder(BorderFactory.createEmptyBorder(3, 3, 3, 3));
                
                setToolTipText(i18n.getLabel("Channel.tt", getModel().getChannelId()));
                
                Dimension d = btnInstr.getPreferredSize();
                btnInstr.setMaximumSize(new Dimension(Short.MAX_VALUE, d.height));
                p.add(btnInstr);
                p.add(Box.createRigidArea(new Dimension(6, 0)));
                
                btnEdit.setToolTipText(i18n.getLabel("Channel.btnEdit.tt"));
                btnEdit.setBorder(BorderFactory.createEmptyBorder(0, 0, 0, 0));
                p.add(btnEdit);
                p.add(Box.createRigidArea(new Dimension(6, 0)));
                
                lStreams.setHorizontalAlignment(JLabel.CENTER);
                lVoices.setHorizontalAlignment(JLabel.CENTER);
                
                JPanel statPane = new JPanel();
                statPane.setOpaque(false);
                statPane.setBorder(BorderFactory.createLoweredBevelBorder());
                statPane.setLayout(new BoxLayout(statPane, BoxLayout.X_AXIS));
                statPane.add(Box.createRigidArea(new Dimension(6, 0)));
                statPane.add(lStreams);
                statPane.add(new JLabel("/"));
                statPane.add(lVoices);
                statPane.add(Box.createRigidArea(new Dimension(6, 0)));
                
                p.add(statPane);
                
                p.add(Box.createRigidArea(new Dimension(6, 0)));
                
                btnMute.setBorder(BorderFactory.createEmptyBorder(0, 0, 0, 0));
                p.add(btnMute);
                p.add(Box.createRigidArea(new Dimension(6, 0)));
                
                btnSolo.setBorder(BorderFactory.createEmptyBorder(0, 0, 0, 0));
                p.add(btnSolo);
                p.add(Box.createRigidArea(new Dimension(6, 0)));
                
                JPanel volumePane = new JPanel();
                volumePane.setOpaque(false);
                volumePane.setBorder(BorderFactory.createLoweredBevelBorder());
                volumePane.setLayout(new BoxLayout(volumePane, BoxLayout.X_AXIS));
                volumePane.add(Box.createRigidArea(new Dimension(6, 0)));
                
                volumePane.add(lVolImg);
                volumePane.add(Box.createRigidArea(new Dimension(1, 0)));
                
                d = slVolume.getPreferredSize();
                slVolume.setMaximumSize(new Dimension(d.width > 300 ? d.width : 300, d.height));
                slVolume.setOpaque(false);
                volumePane.add(slVolume);
                
                lVolume.setBorder(BorderFactory.createEmptyBorder(3, 6, 3, 6));
                lVolume.setHorizontalAlignment(lVolume.RIGHT);
                
                // We use this to set the size of the lVolume that will be used in setVolume()
                // to prevent the frequent resizing of lVolume
                lVolume.setText("100%");
                
                volumePane.add(lVolume);
                
                p.add(volumePane);
                p.add(Box.createRigidArea(new Dimension(6, 0)));
                
                btnProperties.setContentAreaFilled(false);
                btnProperties.setBorder(BorderFactory.createEmptyBorder(0, 0, 0, 0));
                btnProperties.setIcon(iconShowProperties);
                btnProperties.setSelectedIcon(iconHideProperties);
                p.add(btnProperties);
                
                mainPane.add(p);
                
                propertiesPane = new ChannelProperties(model);
                propertiesPane.setBorder(BorderFactory.createEmptyBorder(0, 3, 3, 3));
                propertiesPane.setVisible(false);
                mainPane.add(propertiesPane);
                add(mainPane);
                
                d = getPreferredSize();
                setMaximumSize(new Dimension(getMaximumSize().width, d.height));
                
                getModel().addSamplerChannelListener(getHandler());
                
                actInstr = new AbstractAction() {
                        public void
                        actionPerformed(ActionEvent e) {
                                if(actInstr.isEnabled()) loadInstrument();
                        }
                };
                
                btnInstr.addActionListener(actInstr);
                
                btnEdit.addActionListener(new ActionListener() {
                        public void
                        actionPerformed(ActionEvent e) {
                                CC.getSamplerModel().editBackendInstrument(getChannelId());
                        }
                });
                
                btnMute.addActionListener(new ActionListener() {
                        public void
                        actionPerformed(ActionEvent e) { changeMute(); }
                });
                
                btnSolo.addActionListener(new ActionListener() {
                        public void
                        actionPerformed(ActionEvent e) { changeSolo(); }
                });
                
                slVolume.addChangeListener(new ChangeListener() {
                        public void
                        stateChanged(ChangeEvent e) { setVolume(); }
                });
                
                btnProperties.addActionListener(new ActionListener() {
                        public void
                        actionPerformed(ActionEvent e) {
                                showProperties(btnProperties.isSelected());
                                
                                String s;
                                if(btnProperties.isSelected()) {
                                        s = i18n.getButtonLabel("Channel.ttHideProps");
                                } else {
                                        s = i18n.getButtonLabel("Channel.ttShowProps");
                                }
                                
                                btnProperties.setToolTipText(s);
                        }
                });
                
                btnProperties.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
                
                String s;
                if(btnProperties.isSelected()) s = i18n.getButtonLabel("Channel.ttHideProps");
                else s = i18n.getButtonLabel("Channel.ttShowProps");
                
                btnProperties.setToolTipText(s);
                
                addPropertyChangeListener(getHandler());
                
                updateChannelInfo();
        }
        
        public class InstrumentButton extends JButton {
                private boolean dragging = false;
                
                InstrumentButton(String s) {
                        super(s);
                        
                        setTransferHandler(new TransferHandler("instrument"));
                        
                        addMouseListener(new MouseAdapter() {
                                public void
                                mouseExited(MouseEvent e) {
                                        if(!dragging) return;
                                        
                                        int b1 = e.BUTTON1_DOWN_MASK;
                                        if((e.getModifiersEx() & b1) != b1) return;
                                        
                                        actInstr.setEnabled(false);
                                        doClick(0);
                                        actInstr.setEnabled(true);
                                        
                                        JComponent c = (JComponent)e.getSource();
                                        TransferHandler handler = c.getTransferHandler();
                                        handler.exportAsDrag(c, e, TransferHandler.COPY);
                                }
                                
                                public void
                                mouseReleased(MouseEvent e) { dragging = false; }
                        });
                        
                        addMouseMotionListener(new MouseMotionAdapter() {
                                public void
                                mouseDragged(MouseEvent e) { dragging = true; }
                        });
                }
                
                public String
                getInstrument() {
                        SamplerChannel sc = Channel.this.getChannelInfo();
                        
                        if(sc.getInstrumentName() == null || sc.getInstrumentStatus() < 0)
                                return null;
                        
                        Instrument instr = new Instrument();
                        instr.setName(sc.getInstrumentName());
                        instr.setInstrumentIndex(sc.getInstrumentIndex());
                        instr.setPath(sc.getInstrumentFile());
                        return instr.getDnDString();
                }
                
                public void setInstrument(String instr) {
                        if(!Instrument.isDnDString(instr)) return;
                        
                        String[] args = instr.split("\n");
                        if(args.length < 6) return;
                        
                        try {
                                int idx = Integer.parseInt(args[5]);
                                Channel.this.getModel().loadBackendInstrument(args[4], idx);
                        } catch(Exception x) {
                                CC.getLogger().log(Level.INFO, HF.getErrorMessage(x), x);
                        }
                }
        }
        
        private final EventHandler eventHandler = new EventHandler();
        
        private EventHandler
        getHandler() { return eventHandler; }
        
        private class EventHandler extends MouseAdapter implements SamplerChannelListener,
                                                        PropertyChangeListener, HierarchyListener {
                /**
                 * Invoked when changes are made to a sampler channel.
                 * @param e A <code>SamplerChannelEvent</code> instance
                 * containing event information.
                 */
                public void
                channelChanged(SamplerChannelEvent e) { updateChannelInfo(); }
        
                /**
                 * Invoked when the number of active disk streams has changed.
                 * @param e A <code>SamplerChannelEvent</code> instance
                 * containing event information.
                 */
                public void
                streamCountChanged(SamplerChannelEvent e) {
                        updateStreamCount(getModel().getStreamCount());
                }
        
                /**
                 * Invoked when the number of active voices has changed.
                 * @param e A <code>SamplerChannelEvent</code> instance
                 * containing event information.
                 */
                public void
                voiceCountChanged(SamplerChannelEvent e) {
                        updateVoiceCount(getModel().getVoiceCount());
                }
                
                public void
                propertyChange(PropertyChangeEvent e) {
                        if (
                                e.getPropertyName() == "borderColor" ||
                                e.getPropertyName() == "borderHighlightedColor" ||
                                e.getPropertyName() == "selectedChannelBgColor" ||
                                e.getPropertyName() == "highlightedChannelBgColor"
                        ) {
                                updateColors(isSelected());
                        }
                }
                
                public void
                mouseEntered(MouseEvent e) {
                        mouseOver = true;
                        updateColors(isSelected());
                }
                
                public void
                mouseExited(MouseEvent e) {
                        if(getMousePosition(true) != null) return;
                        
                        mouseOver = false;
                        updateColors(isSelected());
                }
                
                
                /** Called when the hierarchy has been changed. */
                public void
                hierarchyChanged(HierarchyEvent e) {
                        if((e.getChangeFlags() & e.SHOWING_CHANGED) == e.SHOWING_CHANGED) {
                                if(getMousePosition() == null) mouseExited(null);
                                else mouseEntered(null);
                        }
                }
        }
        
        /**
         * Determines whether the channel is selected.
         * @return <code>true</code> if the channel is selected, <code>false</code> otherwise.
         */
        public boolean isSelected() { return selected; }
        
        /**
         * Sets the selection state of this channel.
         * This method is invoked when the selection state of the channel has changed.
         * @param select Specifies the new selection state of this channel;
         * <code>true</code> to select the channel, <code>false</code> otherwise.
         */
        public void
        setSelected(boolean select) {
                updateColors(select);
                
                selected = select;
        }
        
        /**
         * Updates the channel background and border colors.
         * @param selected Specifies the selection state of this channel.
         */
        private void
        updateColors(boolean selected) {
                if(selected) {
                        mainPane.setBorder(borderSelected);
                        mainPane.setBackground(chnSelectedColor);
                } else {
                        if(mouseOver) {
                                mainPane.setBorder(borderHighlighted);
                                mainPane.setBackground(chnHighlightedColor);
                        } else {
                                mainPane.setBorder(borderDeselected);
                                mainPane.setBackground(chnColor);
                        }
                }
        }
        
        /** Hides the channel properties. */
        public void
        collapseChannel() { if(btnProperties.isSelected()) btnProperties.doClick(); }
        
        /** Shows the channel properties. */
        public void
        expandChannel() { if(!btnProperties.isSelected()) btnProperties.doClick(); }
        
        /**
         * Updates the channel settings. This method is invoked when changes to the
         * channel were made.
         */
        private void
        updateChannelInfo() {
                SamplerChannel sc = getChannelInfo();
                
                int status = sc.getInstrumentStatus();
                if(status >= 0 && status < 100) {
                        btnInstr.setText(i18n.getLabel("Channel.loadingInstrument", status));
                } else if(status == -1) {
                        btnInstr.setText(i18n.getLabel("Channel.btnInstr"));
                } else if(status < -1) {
                         btnInstr.setText(i18n.getLabel("Channel.errorLoadingInstrument"));
                } else {
                        if(sc.getInstrumentName() != null) btnInstr.setText(sc.getInstrumentName());
                        else btnInstr.setText(i18n.getLabel("Channel.btnInstr"));
                }
                
                updateMuteIcon(sc);
                
                if(sc.isSoloChannel()) btnSolo.setIcon(iconSoloOn);
                else btnSolo.setIcon(iconSoloOff);
                
                slVolume.setValue((int)(sc.getVolume() * 100));
                
                boolean b = sc.getEngine() != null;
                slVolume.setEnabled(b);
                btnSolo.setEnabled(b);
                btnMute.setEnabled(b);
        }
        
        /** Invoked when the user clicks the mute button. */
        private void
        changeMute() {
                SamplerChannel sc = getChannelInfo();
                boolean b = true;
                
                /*
                 * Changing the mute button icon now instead of
                 * leaving the work to the notification mechanism of the LinuxSampler.
                 */
                if(sc.isMuted() && !sc.isMutedBySolo()) {
                        b = false;
                        boolean hasSolo = CC.getSamplerModel().hasSoloChannel();
                        
                        if(sc.isSoloChannel() || !hasSolo) btnMute.setIcon(iconMuteOff);
                        else btnMute.setIcon(iconMutedBySolo);
                } else btnMute.setIcon(iconMuteOn);
                
                getModel().setBackendMute(b);
        }
        
        /** Invoked when the user clicks the solo button. */
        private void
        changeSolo() {
                SamplerChannel sc = getChannelInfo();
                boolean b = !sc.isSoloChannel();
                
                /*
                 * Changing the solo button icon (and related) now instead of
                 * leaving the work to the notification mechanism of the LinuxSampler.
                 */
                if(b) {
                        btnSolo.setIcon(iconSoloOn);
                        if(sc.isMutedBySolo()) btnMute.setIcon(iconMuteOff);
                } else {
                        btnSolo.setIcon(iconSoloOff);
                        if(!sc.isMuted() && CC.getSamplerModel().getSoloChannelCount() > 1)
                                btnMute.setIcon(iconMutedBySolo);
                }
                
                getModel().setBackendSolo(b);
        }
        
        /** Invoked when the user changes the volume */
        private void
        setVolume() {
                updateVolume();
                
                if(slVolume.getValueIsAdjusting()) return;
                
                int vol = (int)(getChannelInfo().getVolume() * 100);
                
                if(vol == slVolume.getValue()) return;
                
                /*
                 * If the model's volume is not equal to the slider
                 * value we assume that the change is due to user input.
                 * So we must update the volume at the backend too.
                 */
                float volume = slVolume.getValue();
                volume /= 100;
                getModel().setBackendVolume(volume);
        }
        
        private void
        updateVolume() {
                int volume = slVolume.getValue();
                slVolume.setToolTipText(i18n.getLabel("Channel.volume", volume));
                lVolImg.setToolTipText(i18n.getLabel("Channel.volume", volume));
                
                setVolumeLabel(volume);
                
                
        }
        
        private void
        setVolumeLabel(int volume) {
                Dimension d = lVolume.getPreferredSize();
                lVolume.setText(String.valueOf(volume) + '%');
                d = JuifeUtils.getUnionSize(d, lVolume.getPreferredSize());
                lVolume.setMinimumSize(d);
                lVolume.setPreferredSize(d);
                lVolume.setMaximumSize(d);
        }
        
        /**
         * Updates the mute button with the proper icon regarding to information obtained
         * from <code>channel</code>.
         * @param channel A <code>SamplerChannel</code> instance containing the new settings
         * for this channel.
         */
        private void
        updateMuteIcon(SamplerChannel channel) {
                if(channel.isMutedBySolo()) btnMute.setIcon(iconMutedBySolo);
                else if(channel.isMuted()) btnMute.setIcon(iconMuteOn);
                else btnMute.setIcon(iconMuteOff);
        }
        
        /**
         * Updates the number of active disk streams.
         * @param count The new number of active disk streams.
         */
        private void
        updateStreamCount(int count) {
                Dimension d = lStreams.getPreferredSize();
                lStreams.setText(count == 0 ? "--" : String.valueOf(count));
                d = JuifeUtils.getUnionSize(d, lStreams.getPreferredSize());
                lStreams.setMinimumSize(d);
                lStreams.setPreferredSize(d);
                lStreams.setMaximumSize(d);
        }
        
        /**
         * Updates the number of active voices.
         * @param count The new number of active voices.
         */
        private void
        updateVoiceCount(int count) {
                Dimension d = lVoices.getPreferredSize();
                lVoices.setText(count == 0 ? "--" : String.valueOf(count));
                d = JuifeUtils.getUnionSize(d, lVoices.getPreferredSize());
                lVoices.setMinimumSize(d);
                lVoices.setPreferredSize(d);
                lVoices.setMaximumSize(d);
        }
        
        private void
        showProperties(boolean show) {propertiesPane.setVisible(show); }
        
        private void
        loadInstrument() {
                JSInstrumentChooser dlg = new JSInstrumentChooser(CC.getMainFrame());
                dlg.setVisible(true);
                
                if(dlg.isCancelled()) return;
                
                SamplerEngine engine = getChannelInfo().getEngine();
                if(dlg.getEngine() != null) {
                        if(engine == null || !dlg.getEngine().equals(engine.getName()));
                                getModel().setBackendEngineType(dlg.getEngine());
                }
                
                int idx = dlg.getInstrumentIndex();
                getModel().loadBackendInstrument(dlg.getInstrumentFile(), idx);
                
        }
}

class ChannelProperties extends JPanel {
        private final JLabel lMidiDevice =
                new JLabel(i18n.getLabel("ChannelProperties.lMidiDevice"));
        private final JLabel lMidiPort =
                new JLabel(i18n.getLabel("ChannelProperties.lMidiPort"));
        private final JLabel lMidiChannel =
                new JLabel(i18n.getLabel("ChannelProperties.lMidiChannel"));
        
        private final JLabel lInstrumentMap =
                new JLabel(i18n.getLabel("ChannelProperties.lInstrumentMap"));
        
        private final JLabel lAudioDevice =
                new JLabel(i18n.getLabel("ChannelProperties.lAudioDevice"));
        
        private final JComboBox cbEngines = new JComboBox();
        
        private final JComboBox cbInstrumentMap = new JComboBox();
        private final JComboBox cbMidiDevice = new JComboBox();
        private final JComboBox cbMidiPort = new JComboBox();
        private final JComboBox cbMidiChannel = new JComboBox();
        private final JComboBox cbAudioDevice = new JComboBox();
        
        private final JButton btnFxSends = new JButton(Res.iconFxSends22);
        private final JButton btnAudioProps = new JButton(Res.iconAudioProps16);
        private InformationDialog fxSendsDlg = null;
        
        private SamplerChannelModel channelModel = null;
        private MidiDeviceModel midiDevice = null;
        
        private boolean update = false;
        
        private final SamplerListener samplerListener;
        private final MapListListener mapListListener = new MapListListener();
        
        private class NoMap {
                public String
                toString() { return "[None]"; }
        }
        
        private NoMap noMap = new NoMap();
        
        private class DefaultMap {
                public String
                toString() { return "[Default]"; }
        }
        
        private DefaultMap defaultMap = new DefaultMap();
        
        /**
         * Creates a new instance of <code>ChannelProperties</code> using the specified non-null
         * channel model.
         * @param model The model to be used by this channel properties pane.
         */
        ChannelProperties(SamplerChannelModel model) {
                channelModel = model;
                
                setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));
                setOpaque(false);
                
                add(new JSeparator());
                
                JPanel enginesPane = createEnginePane();                
                
                JPanel devicesPane = new JPanel();
                devicesPane.setOpaque(false);
                devicesPane.setLayout(new BoxLayout(devicesPane, BoxLayout.X_AXIS));
                
                devicesPane.add(Box.createRigidArea(new Dimension(3, 0)));
                
                devicesPane.add(createMidiPane());
                
                devicesPane.add(Box.createRigidArea(new Dimension(3, 0)));
                
                devicesPane.add(enginesPane);
                
                devicesPane.add(Box.createRigidArea(new Dimension(3, 0)));
                
                JPanel audioPane = createAudioPane();
                Dimension d = audioPane.getPreferredSize();
                d.height = Short.MAX_VALUE;
                
                audioPane.setMaximumSize(d);
                devicesPane.add(audioPane);
                
                add(devicesPane);
                add(Box.createRigidArea(new Dimension(0, 6)));
                
                add(new JSeparator());
                
                cbMidiChannel.addItem("All");
                for(int i = 1; i <= 16; i++) cbMidiChannel.addItem(String.valueOf(i));
                
                cbMidiDevice.addActionListener(new ActionListener() {
                        public void
                        actionPerformed(ActionEvent e) { setMidiDevice(); }
                });
                
                cbMidiPort.addActionListener(new ActionListener() {
                        public void
                        actionPerformed(ActionEvent e) { setMidiPort(); }
                });
                
                cbMidiChannel.addActionListener(new ActionListener() {
                        public void
                        actionPerformed(ActionEvent e) { setMidiChannel(); }
                });
                
                cbEngines.addActionListener(new ActionListener() {
                        public void
                        actionPerformed(ActionEvent e) { setEngineType(); }
                });
                
                cbAudioDevice.addActionListener(new ActionListener() {
                        public void
                        actionPerformed(ActionEvent e) { setAudioDevice(); }
                });
                
                getModel().addSamplerChannelListener(new SamplerChannelAdapter() {
                        public void
                        channelChanged(SamplerChannelEvent e) { updateChannelProperties(); }
                });
                
                samplerListener = new SamplerAdapter() {
                        /** Invoked when the default MIDI instrument map is changed. */
                        public void
                        defaultMapChanged(SamplerEvent e) {
                                updateCbInstrumentMapToolTipText();
                        }
                };
                
                CC.getSamplerModel().addSamplerListener(samplerListener);
                
                cbInstrumentMap.addItem(noMap);
                cbInstrumentMap.addItem(defaultMap);
                for(MidiInstrumentMap map : CC.getSamplerModel().getMidiInstrumentMaps()) {
                        cbInstrumentMap.addItem(map);
                }
                
                int map = getModel().getChannelInfo().getMidiInstrumentMapId();
                cbInstrumentMap.setSelectedItem(CC.getSamplerModel().getMidiInstrumentMapById(map));
                if(cbInstrumentMap.getSelectedItem() == null) {
                        if(map == -1) cbInstrumentMap.setSelectedItem(noMap);
                        else if(map == -2) {
                                cbInstrumentMap.setSelectedItem(defaultMap);
                        }
                }
                
                updateCbInstrumentMapToolTipText();
                
                if(getModel().getChannelInfo().getEngine() == null) {
                        cbInstrumentMap.setEnabled(false);
                }
                
                cbInstrumentMap.addActionListener(new ActionListener() {
                        public void
                        actionPerformed(ActionEvent e) { updateInstrumentMap(); }
                });
                
                CC.getSamplerModel().addMidiDeviceListListener(getHandler());
                CC.getSamplerModel().addAudioDeviceListListener(getHandler());
                CC.getSamplerModel().addSamplerChannelListListener(getHandler());
                CC.getSamplerModel().addMidiInstrumentMapListListener(mapListListener);
                
                btnAudioProps.setToolTipText(i18n.getLabel("ChannelProperties.routing"));
                btnAudioProps.setEnabled(false);
                btnAudioProps.addActionListener(new ActionListener() {
                        public void
                        actionPerformed(ActionEvent e) {
                                SamplerChannel c = getModel().getChannelInfo();
                                new JSChannelOutputRoutingDlg(CC.getMainFrame(), c).setVisible(true);
                        
                        }
                });
                
                btnFxSends.setToolTipText(i18n.getButtonLabel("ChannelProperties.btnFxSends"));
                btnFxSends.addActionListener(new ActionListener() {
                        public void
                        actionPerformed(ActionEvent e) {
                                if(fxSendsDlg != null && fxSendsDlg.isVisible()) {
                                        fxSendsDlg.toFront();
                                        return;
                                }
                                
                                FxSendsPane p = new FxSendsPane(getModel());
                                int id = getModel().getChannelId();
                                fxSendsDlg = new InformationDialog(CC.getMainFrame(), p);
                                fxSendsDlg.setTitle(i18n.getLabel("FxSendsDlg.title", id));
                                fxSendsDlg.setModal(false);
                                fxSendsDlg.showCloseButton(false);
                                fxSendsDlg.setVisible(true);
                        }
                });
                
                updateMidiDevices();
                updateAudioDevices();
                updateChannelProperties();
        }
        
        class FxSendsPane extends JSFxSendsPane {
                FxSendsPane(SamplerChannelModel model) {
                        super(model);
                        
                        actionAddFxSend.putValue(Action.SMALL_ICON, Res.iconNew16);
                        actionRemoveFxSend.putValue(Action.SMALL_ICON, Res.iconDelete16);
                }
                
                protected JToolBar
                createToolBar() {
                        JToolBar tb = new JToolBar();
                        Dimension d = new Dimension(Short.MAX_VALUE, tb.getPreferredSize().height);
                        tb.setMaximumSize(d);
                        tb.setFloatable(false);
                        tb.setAlignmentX(JPanel.RIGHT_ALIGNMENT);
                        
                        tb.add(new ToolbarButton(actionAddFxSend));
                        tb.add(new ToolbarButton(actionRemoveFxSend));
                
                        return tb;
                }
        }
        
        private JPanel
        createEnginePane() {
                for(SamplerEngine e : CC.getSamplerModel().getEngines()) cbEngines.addItem(e);
                
                cbEngines.setMaximumSize(cbEngines.getPreferredSize());
                
                JPanel p = new JPanel();
                p.setOpaque(false);
                p.setLayout(new BoxLayout(p, BoxLayout.Y_AXIS));
                p.add(cbEngines);
                p.setBorder(BorderFactory.createEmptyBorder(3, 3, 3, 3));
                
                //enginesPane.add(Box.createGlue());
                JPanel enginesPane = new JPanel();
                enginesPane.setOpaque(false);
                enginesPane.setLayout(new BorderLayout());
                enginesPane.add(p, BorderLayout.SOUTH);
                //enginesPane.add(Box.createRigidArea(new Dimension(0, 3)));
                
                String s = i18n.getLabel("ChannelProperties.enginesPane");
                enginesPane.setBorder(BorderFactory.createTitledBorder(s));
                Dimension d = new Dimension(enginesPane.getPreferredSize().width, Short.MAX_VALUE);
                enginesPane.setMaximumSize(d);
                return enginesPane;
        }
        
        private JPanel
        createMidiPane() {
                JPanel midiPane = new JPanel();
                midiPane.setOpaque(false);
                
                GridBagLayout gridbag = new GridBagLayout();
                GridBagConstraints c = new GridBagConstraints();
                
                midiPane.setLayout(gridbag);
                
                c.gridx = 1;
                c.gridy = 0;
                c.insets = new Insets(0, 3, 3, 3);
                gridbag.setConstraints(lMidiDevice, c);
                midiPane.add(lMidiDevice);
                
                c.gridx = 2;
                c.gridy = 0;
                gridbag.setConstraints(lMidiPort, c);
                midiPane.add(lMidiPort);
                
                c.gridx = 3;
                c.gridy = 0;
                gridbag.setConstraints(lMidiChannel, c);
                midiPane.add(lMidiChannel);
                
                c.gridx = 4;
                c.gridy = 0;
                c.insets = new Insets(0, 10, 3, 3);
                gridbag.setConstraints(lInstrumentMap, c);
                midiPane.add(lInstrumentMap);
                
                btnFxSends.setMargin(new Insets(0, 0, 0, 0));
                c.gridx = 0;
                c.gridy = 0;
                c.gridheight = 2;
                c.insets = new Insets(0, 5, 0, 8);
                gridbag.setConstraints(btnFxSends, c);
                midiPane.add(btnFxSends);
                
                c.gridx = 1;
                c.gridy = 1;
                c.gridheight = 1;
                c.insets = new Insets(0, 4, 4, 3);
                c.fill = GridBagConstraints.HORIZONTAL;
                gridbag.setConstraints(cbMidiDevice, c);
                midiPane.add(cbMidiDevice);
                
                c.gridx = 3;
                c.gridy = 1;
                gridbag.setConstraints(cbMidiChannel, c);
                midiPane.add(cbMidiChannel);
                
                c.gridx = 2;
                c.gridy = 1;
                gridbag.setConstraints(cbMidiPort, c);
                midiPane.add(cbMidiPort);
                
                c.gridx = 4;
                c.gridy = 1;
                c.weightx = 1.0;
                c.insets = new Insets(0, 10, 3, 3);
                gridbag.setConstraints(cbInstrumentMap, c);
                midiPane.add(cbInstrumentMap);
                
                String s = i18n.getLabel("ChannelProperties.midiPane");
                TitledBorder border = BorderFactory.createTitledBorder(s);
                //border.setTitlePosition(border.TOP);
                midiPane.setBorder(border);
                return midiPane;
        }
        
        private JPanel
        createAudioPane() {
                JPanel audioPane = new JPanel();
                audioPane.setOpaque(false);
                
                GridBagLayout gridbag = new GridBagLayout();
                GridBagConstraints c = new GridBagConstraints();
                
                audioPane.setLayout(gridbag);
                
                c.gridx = 0;
                c.gridy = 0;
                c.insets = new Insets(0, 3, 3, 3);
                gridbag.setConstraints(lAudioDevice, c);
                audioPane.add(lAudioDevice);
                
                c.gridx = 0;
                c.gridy = 1;
                c.fill = GridBagConstraints.HORIZONTAL;
                gridbag.setConstraints(cbAudioDevice, c);
                audioPane.add(cbAudioDevice);
                
                btnAudioProps.setMargin(new Insets(0, 0, 0, 0));
                c.gridx = 1;
                c.gridy = 1;
                c.fill = GridBagConstraints.NONE;
                gridbag.setConstraints(btnAudioProps, c);
                audioPane.add(btnAudioProps);
                
                String s = i18n.getLabel("ChannelProperties.audioPane");
                audioPane.setBorder(BorderFactory.createTitledBorder(s));
                
                return audioPane;
        }
        
        /**
         * Gets the model that is currently used by this channel properties pane.
         * @return model The <code>SamplerChannelModel</code> instance
         * that provides information about the channel whose settings are
         * represented by this channel properties pane.
         */
        public SamplerChannelModel
        getModel() { return channelModel; }
        
        
        private void
        updateInstrumentMap() {
                updateCbInstrumentMapToolTipText();
                
                int id = getModel().getChannelInfo().getMidiInstrumentMapId();
                Object o = cbInstrumentMap.getSelectedItem();
                if(o == null && id == -1) return;
                
                int cbId;
                if(o == null || o == noMap) cbId = -1;
                else if(o == defaultMap) cbId = -2;
                else cbId = ((MidiInstrumentMap)o).getMapId();
                
                if(cbId == id) return;
                
                channelModel.setBackendMidiInstrumentMap(cbId);
        }
        
        private void
        updateCbInstrumentMapToolTipText() {
                if(cbInstrumentMap.getSelectedItem() != defaultMap) {
                        cbInstrumentMap.setToolTipText(null);
                        return;
                }
                
                MidiInstrumentMap m = CC.getSamplerModel().getDefaultMidiInstrumentMap();
                if(m != null) {
                        String s = i18n.getLabel("Channel.ttDefault", m.getName());
                        cbInstrumentMap.setToolTipText(s);
                } else {
                        cbInstrumentMap.setToolTipText(null);
                }
        }
        
        /**
         * Updates the channel settings. This method is invoked when changes to the
         * channel were made.
         */
        private void
        updateChannelProperties() {
                SamplerModel sm = CC.getSamplerModel();
                SamplerChannel sc = getModel().getChannelInfo();
                
                MidiDeviceModel mm = sm.getMidiDeviceById(sc.getMidiInputDevice());
                AudioDeviceModel am = sm.getAudioDeviceById(sc.getAudioOutputDevice());
                
                if(isUpdate()) CC.getLogger().warning("Unexpected update state!");
                
                setUpdate(true);
                
                try {
                        cbMidiDevice.setSelectedItem(mm == null ? null : mm.getDeviceInfo());
                        
                        cbEngines.setSelectedItem(sc.getEngine());
                        
                        cbAudioDevice.setSelectedItem(am == null ? null : am.getDeviceInfo());
                        btnAudioProps.setEnabled(am != null);
                } catch(Exception x) {
                        CC.getLogger().log(Level.WARNING, "Unkown error", x);
                }
                
                if(sc.getEngine() != null) {
                        cbInstrumentMap.setEnabled(true);
                        int id = sc.getMidiInstrumentMapId();
                        Object o;
                        if(id == -2) o = defaultMap;
                        else if(id == -1) o = noMap;
                        else o = CC.getSamplerModel().getMidiInstrumentMapById(id);
                        
                        if(cbInstrumentMap.getSelectedItem() != o) {
                                cbInstrumentMap.setSelectedItem(o);
                        }
                } else {
                        cbInstrumentMap.setSelectedItem(noMap);
                        cbInstrumentMap.setEnabled(false);
                }
                
                setUpdate(false);
        }
        
        /**
         * Updates the MIDI device list.
         */
        private void
        updateMidiDevices() {
                SamplerModel sm = CC.getSamplerModel();
                SamplerChannel sc = getModel().getChannelInfo();
                
                setUpdate(true);
                
                try {
                        cbMidiDevice.removeAllItems();
                
                        for(MidiDeviceModel m : sm.getMidiDevices())
                                cbMidiDevice.addItem(m.getDeviceInfo());
                
                        MidiDeviceModel mm = sm.getMidiDeviceById(sc.getMidiInputDevice());
                        cbMidiDevice.setSelectedItem(mm == null ? null : mm.getDeviceInfo());
                } catch(Exception x) {
                        CC.getLogger().log(Level.WARNING, "Unkown error", x);
                }
                 
                setUpdate(false);
        }
        
        /**
         * Updates the audio device list.
         */
        private void
        updateAudioDevices() {
                SamplerModel sm = CC.getSamplerModel();
                SamplerChannel sc = getModel().getChannelInfo();
                
                setUpdate(true);
                
                try {
                        cbAudioDevice.removeAllItems();
                
                        for(AudioDeviceModel m : sm.getAudioDevices()) 
                                cbAudioDevice.addItem(m.getDeviceInfo());
                
                        AudioDeviceModel am = sm.getAudioDeviceById(sc.getAudioOutputDevice());
                        cbAudioDevice.setSelectedItem(am == null ? null : am.getDeviceInfo());
                } catch(Exception x) {
                        CC.getLogger().log(Level.WARNING, "Unkown error", x);
                }
                
                setUpdate(false);
        }
        
        private void
        setMidiDevice() {
                MidiInputDevice mid = (MidiInputDevice)cbMidiDevice.getSelectedItem();
                
                if(!isUpdate()) {
                        if(mid != null) getModel().setBackendMidiInputDevice(mid.getDeviceId());
                        return;
                }
                
                if(midiDevice != null) midiDevice.removeMidiDeviceListener(getHandler());
                
                cbMidiPort.removeAllItems();
                
                if(mid == null) {
                        midiDevice = null;
                        cbMidiPort.setEnabled(false);
                        
                        cbMidiChannel.setSelectedItem(null);
                        cbMidiChannel.setEnabled(false);
                } else {
                        midiDevice = CC.getSamplerModel().getMidiDeviceById(mid.getDeviceId());
                        if(midiDevice != null) midiDevice.addMidiDeviceListener(getHandler());
                        
                        cbMidiPort.setEnabled(true);
                        
                        MidiPort[] ports = mid.getMidiPorts();
                        for(MidiPort port : ports) cbMidiPort.addItem(port);
                        
                        int p = getModel().getChannelInfo().getMidiInputPort();
                        cbMidiPort.setSelectedItem(p >= 0 && p < ports.length ? ports[p] : null);
                        
                        cbMidiChannel.setEnabled(true);
                        int c = getModel().getChannelInfo().getMidiInputChannel();
                        cbMidiChannel.setSelectedItem(c == -1 ? "All" : String.valueOf(c + 1));
                }
                
                
        }
        
        private void
        setMidiPort() {
                if(isUpdate()) return;
                
                getModel().setBackendMidiInputPort(cbMidiPort.getSelectedIndex());
        }
        
        private void
        setMidiChannel() {
                if(isUpdate()) return;
                
                Object o = cbMidiChannel.getSelectedItem();
                if(o == null) return;
                
                int c = o.toString().equals("All") ? -1 : Integer.parseInt(o.toString()) - 1;
                
                getModel().setBackendMidiInputChannel(c);
        }
        
        /** Invoked when the user selects an engine. */
        private void
        setEngineType() {
                Object oldEngine = getModel().getChannelInfo().getEngine();
                SamplerEngine newEngine = (SamplerEngine)cbEngines.getSelectedItem();
                
                if(oldEngine != null) { if(oldEngine.equals(newEngine)) return; }
                else if(newEngine == null) return;
                
                getModel().setBackendEngineType(newEngine.getName());
                
        }
        
        private void
        setAudioDevice() {
                if(isUpdate()) return;
                AudioOutputDevice dev = (AudioOutputDevice)cbAudioDevice.getSelectedItem();
                if(dev != null) getModel().setBackendAudioOutputDevice(dev.getDeviceId());
        }
        
        /**
         * Determines whether the currently processed changes are due to update.
         * @return <code>true</code> if the currently processed changes are due to update and
         * <code>false</code> if the currently processed changes are due to user input.
         */
        private boolean
        isUpdate() { return update; }
        
        /**
         * Sets whether the currently processed changes are due to update.
         * @param b Specify <code>true</code> to indicate that the currently 
         * processed changes are due to update; <code>false</code> 
         * indicates that the currently processed changes are due to user input.
         */
        private void
        setUpdate(boolean b) { update = b; }
        
        private final Handler handler = new Handler();
        
        private Handler
        getHandler() { return handler; }
        
        private class Handler implements MidiDeviceListListener, ListListener<AudioDeviceModel>,
                                        SamplerChannelListListener, MidiDeviceListener {
                
                /**
                 * Invoked when a new MIDI device is created.
                 * @param e A <code>MidiDeviceListEvent</code>
                 * instance providing the event information.
                 */
                public void
                deviceAdded(MidiDeviceListEvent e) {
                        cbMidiDevice.addItem(e.getMidiDeviceModel().getDeviceInfo());
                }
        
                /**
                 * Invoked when a MIDI device is removed.
                 * @param e A <code>MidiDeviceListEvent</code>
                 * instance providing the event information.
                 */
                public void
                deviceRemoved(MidiDeviceListEvent e) {
                        cbMidiDevice.removeItem(e.getMidiDeviceModel().getDeviceInfo());
                }
                
                /**
                 * Invoked when a new audio device is created.
                 * @param e An <code>AudioDeviceListEvent</code>
                 * instance providing the event information.
                 */
                public void
                entryAdded(ListEvent<AudioDeviceModel> e) {
                        cbAudioDevice.addItem(e.getEntry().getDeviceInfo());
                }
        
                /**
                 * Invoked when an audio device is removed.
                 * @param e An <code>AudioDeviceListEvent</code>
                 * instance providing the event information.
                 */
                public void
                entryRemoved(ListEvent<AudioDeviceModel> e) {
                        cbAudioDevice.removeItem(e.getEntry().getDeviceInfo());
                }
                
                /**
                 * Invoked when a new sampler channel is created.
                 * @param e A <code>SamplerChannelListEvent</code>
                 * instance providing the event information.
                 */
                public void
                channelAdded(SamplerChannelListEvent e) { }
        
                /**
                 * Invoked when a sampler channel is removed.
                 * @param e A <code>SamplerChannelListEvent</code>
                 * instance providing the event information.
                 */
                public void
                channelRemoved(SamplerChannelListEvent e) {
                        // Some cleanup when the channel is removed.
                        if(e.getChannelModel().getChannelId() == channelModel.getChannelId()) {
                                SamplerModel sm = CC.getSamplerModel();
                                
                                sm.removeMidiDeviceListListener(getHandler());
                                sm.removeAudioDeviceListListener(getHandler());
                                sm.removeMidiInstrumentMapListListener(mapListListener);
                                sm.removeSamplerListener(samplerListener);
                                sm.removeSamplerChannelListListener(getHandler());
                                
                                if(midiDevice != null) {
                                        midiDevice.removeMidiDeviceListener(getHandler());
                                }
                        }
                }
                
                public void
                settingsChanged(MidiDeviceEvent e) {
                        if(isUpdate()) {
                                CC.getLogger().warning("Invalid update state");
                                return;
                        }
                        
                        setUpdate(true);
                        int idx = cbMidiPort.getSelectedIndex();
                        MidiInputDevice d = e.getMidiDeviceModel().getDeviceInfo();
                        
                        cbMidiPort.removeAllItems();
                        for(MidiPort port : d.getMidiPorts()) cbMidiPort.addItem(port);
                        
                        if(idx >= cbMidiPort.getModel().getSize()) idx = 0;
                        
                        setUpdate(false);
                        
                        if(cbMidiPort.getModel().getSize() > 0) cbMidiPort.setSelectedIndex(idx);
                }
        }
        
        private class MapListListener implements ListListener<MidiInstrumentMap> {
                /** Invoked when a new MIDI instrument map is added to a list. */
                public void
                entryAdded(ListEvent<MidiInstrumentMap> e) {
                        cbInstrumentMap.insertItemAt(e.getEntry(), cbInstrumentMap.getItemCount());
                        boolean b = getModel().getChannelInfo().getEngine() != null;
                        if(b && !cbInstrumentMap.isEnabled()) cbInstrumentMap.setEnabled(true);
                }
        
                /** Invoked when a new MIDI instrument map is removed from a list. */
                public void
                entryRemoved(ListEvent<MidiInstrumentMap> e) {
                        cbInstrumentMap.removeItem(e.getEntry());
                        if(cbInstrumentMap.getItemCount() == 0) {
                                cbInstrumentMap.setSelectedItem(noMap);
                                cbInstrumentMap.setEnabled(false);
                        }
                }
        }
}