view/fantasia/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.fantasia;

import java.awt.Container;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Insets;
import java.awt.Rectangle;

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

import java.text.NumberFormat;

import java.util.logging.Level;

import javax.swing.Action;
import javax.swing.BorderFactory;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.DefaultListCellRenderer;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JComponent;
import javax.swing.JLabel;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JPopupMenu;
import javax.swing.JScrollPane;
import javax.swing.JToggleButton;
import javax.swing.JToolBar;
import javax.swing.SwingConstants;
import javax.swing.Timer;

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

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

import org.jdesktop.swingx.JXCollapsiblePane;

import org.jsampler.AudioDeviceModel;
import org.jsampler.CC;
import org.jsampler.HF;
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.jsampler.view.std.JSVolumeEditorPopup;

import org.jvnet.substance.SubstanceImageCreator;

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.fantasia.FantasiaI18n.i18n;
import static org.jsampler.view.fantasia.FantasiaPrefs.*;
import static org.jsampler.view.fantasia.FantasiaUtils.*;
import static org.jsampler.view.std.JSVolumeEditorPopup.VolumeType;


/**
 *
 * @author Grigor Iliev
 */
public class Channel extends org.jsampler.view.JSChannel {
        private final JXCollapsiblePane mainPane;
        private final ChannelScreen screen = new ChannelScreen(this);
        private final ChannelOptions optionsPane = new ChannelOptions(this);
        
        private final PowerButton btnPower = new PowerButton();
        private final MuteButton btnMute = new MuteButton();
        private final SoloButton btnSolo = new SoloButton();
        private final OptionsButton btnOptions = new OptionsButton();
        
        private final EnhancedDial dialVolume = new EnhancedDial();
        
        private boolean selected = 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) {
                this(model, null);
        }
        
        /**
         * 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.
         * @param listener A listener which is notified when the newly created
         * channel is fully expanded on the screen.
         * @throws IllegalArgumentException If the model is <code>null</code>.
         */
        public
        Channel(SamplerChannelModel model, final ActionListener listener) {
                super(model);
                
                setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));
                ChannelPane p = new ChannelPane();
                p.setLayout(new BoxLayout(p, BoxLayout.X_AXIS));
                
                //p.add(Box.createRigidArea(new Dimension(3, 0)));
                
                btnPower.setAlignmentY(JPanel.TOP_ALIGNMENT);
                
                JPanel tb = new JPanel();
                tb.setBorder(BorderFactory.createEmptyBorder(3, 3, 0, 4));
                tb.setLayout(new BoxLayout(tb, BoxLayout.X_AXIS));
                tb.setOpaque(false);
                tb.setAlignmentY(JPanel.TOP_ALIGNMENT);
                tb.add(btnPower);
                tb.setPreferredSize(new Dimension(tb.getPreferredSize().width, 58));
                tb.setMinimumSize(tb.getPreferredSize());
                tb.setMaximumSize(tb.getPreferredSize());
                p.add(tb);
                
                //p.add(Box.createRigidArea(new Dimension(4, 0)));
                
                p.add(createVSeparator());
                
                //p.add(Box.createRigidArea(new Dimension(3, 0)));
                
                JPanel p2 = new JPanel();
                p2.setOpaque(false);
                p2.setLayout(new BoxLayout(p2, BoxLayout.Y_AXIS));
                p2.setAlignmentY(JPanel.TOP_ALIGNMENT);
                p2.setBorder(BorderFactory.createEmptyBorder(5, 3, 0, 2));
                p2.add(screen);
                p.add(p2);
                
                p.add(createVSeparator());
                
                p2 = new JPanel();
                p2.setOpaque(false);
                p2.setLayout(new BoxLayout(p2, BoxLayout.Y_AXIS));
                p2.setAlignmentY(JPanel.TOP_ALIGNMENT);
                p2.setBorder(BorderFactory.createEmptyBorder(4, 0, 0, 0));
                p2.add(new JLabel(Res.gfxMuteTitle));
                p2.add(btnMute);
                p2.add(new JLabel(Res.gfxSoloTitle));
                p2.add(btnSolo);
                
                p.add(p2);
                
                p.add(createVSeparator());
                
                p2 = new JPanel();
                p2.setOpaque(false);
                p2.setLayout(new BoxLayout(p2, BoxLayout.Y_AXIS));
                p2.setAlignmentY(JPanel.TOP_ALIGNMENT);
                p2.setBorder(BorderFactory.createEmptyBorder(4, 0, 0, 0));
                JLabel l = new JLabel(Res.gfxVolumeTitle);
                l.setAlignmentX(JPanel.CENTER_ALIGNMENT);
                l.setBorder(BorderFactory.createEmptyBorder(0, 0, 2, 0));
                p2.add(l);
                dialVolume.setDialPixmap(Res.gfxVolumeDial, 30, 330);
                dialVolume.setAlignmentX(JPanel.CENTER_ALIGNMENT);
                p2.add(dialVolume);
                p.add(p2);
                
                p.add(createVSeparator());
                
                p2 = new JPanel();
                p2.setOpaque(false);
                p2.setLayout(new BoxLayout(p2, BoxLayout.Y_AXIS));
                p2.setAlignmentY(JPanel.TOP_ALIGNMENT);
                p2.setBorder(BorderFactory.createEmptyBorder(27, 0, 0, 0));
                l = new JLabel(Res.gfxOptionsTitle);
                l.setAlignmentX(JPanel.CENTER_ALIGNMENT);
                l.setBorder(BorderFactory.createEmptyBorder(0, 0, 2, 0));
                p2.add(l);
                
                p2.add(Box.createRigidArea(new Dimension(0, 3)));
                
                btnOptions.setAlignmentX(JPanel.CENTER_ALIGNMENT);
                p2.add(btnOptions);
                p.add(p2);
                
                
                p.setPreferredSize(new Dimension(420, 60));
                p.setMinimumSize(p.getPreferredSize());
                p.setMaximumSize(p.getPreferredSize());
                //p.setBorder(BorderFactory.createEmptyBorder(1, 0, 1, 0));

                p.setAlignmentX(JPanel.CENTER_ALIGNMENT);
                optionsPane.setAlignmentX(JPanel.CENTER_ALIGNMENT);
                
                mainPane = new JXCollapsiblePane();
                mainPane.getContentPane().setLayout (
                        new BoxLayout(mainPane.getContentPane(), BoxLayout.Y_AXIS)
                );
                
                mainPane.add(p);
                mainPane.add(optionsPane);
                
                setOpaque(false);
                
                String vmud = VOL_MEASUREMENT_UNIT_DECIBEL;
                preferences().addPropertyChangeListener(vmud, new PropertyChangeListener() {
                        public void
                        propertyChange(PropertyChangeEvent e) {
                                boolean b;
                                b = preferences().getBoolProperty(VOL_MEASUREMENT_UNIT_DECIBEL);
                                screen.updateVolumeInfo(dialVolume.getValue());
                        }
                });
                
                getModel().addSamplerChannelListener(getHandler());
                
                updateChannelInfo();
                
                add(mainPane);
                
                if(listener != null) {
                        final String s = JXCollapsiblePane.ANIMATION_STATE_KEY;
                        mainPane.addPropertyChangeListener(s, new PropertyChangeListener() {
                                public void
                                propertyChange(PropertyChangeEvent e) {
                                        if(e.getNewValue() == "expanded") {
                                                // TODO: this should be done regardles the listener != null?
                                                mainPane.removePropertyChangeListener(s, this);
                                                ///////
                                                listener.actionPerformed(null);
                                                ensureChannelIsVisible();
                                        } else if(e.getNewValue() == "expanding/collapsing") {
                                                ensureChannelIsVisible();
                                        }
                                }
                        });
                }
                
                mainPane.setAnimated(false);
                mainPane.setCollapsed(true);
                mainPane.setAnimated(preferences().getBoolProperty(ANIMATED));
                mainPane.setCollapsed(false);
                
                preferences().addPropertyChangeListener(ANIMATED, new PropertyChangeListener() {
                        public void
                        propertyChange(PropertyChangeEvent e) {
                                mainPane.setAnimated(preferences().getBoolProperty(ANIMATED));
                        }
                });
                
                if(listener != null) {
                        javax.swing.SwingUtilities.invokeLater(new Runnable() {
                                public void
                                run() { listener.actionPerformed(null); }
                        });
                }
                
                CC.getSamplerModel().addSamplerChannelListListener(getHandler());
        }
        
        private void
        ensureChannelIsVisible() {
                Container p = getParent();
                JScrollPane sp = null;
                while(p != null) {
                        if(p instanceof JScrollPane) {
                                sp = (JScrollPane)p;
                                break;
                        }
                        p = p.getParent();
                }
                if(sp == null) return;
                int h = sp.getViewport().getView().getHeight();
                sp.getViewport().scrollRectToVisible(new Rectangle(0, h - 2, 1, 1));
        }
        
        private JPanel
        createVSeparator() {
                PixmapPane p = new PixmapPane(Res.gfxVLine);
                p.setAlignmentY(JPanel.TOP_ALIGNMENT);
                p.setPreferredSize(new Dimension(2, 60));
                p.setMinimumSize(p.getPreferredSize());
                p.setMaximumSize(p.getPreferredSize());
                return p;
        }
        
        /**
         * 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) {
                
                selected = select;
        }
        
        /** Shows the channel properties. */
        public void
        expandChannel() { expandChannel(optionsPane.isAnimated()); }
        
        /** Shows the channel properties. */
        public void
        expandChannel(boolean animated) {
                if(btnOptions.isSelected()) return;
                
                boolean b = optionsPane.isAnimated();
                optionsPane.setAnimated(animated);
                btnOptions.doClick();
                optionsPane.setAnimated(b);
        }
        
        
        /** Invoked when the user changes the volume */
        private void
        setVolume() {
                screen.updateVolumeInfo(dialVolume.getValue());
                
                if(dialVolume.getValueIsAdjusting()) return;
                
                int vol = (int)(getChannelInfo().getVolume() * 100);
                
                if(vol == dialVolume.getValue()) return;
                
                /*
                 * If the model's volume is not equal to the dial knob
                 * value we assume that the change is due to user input.
                 * So we must update the volume at the backend too.
                 */
                float volume = dialVolume.getValue();
                volume /= 100;
                getModel().setBackendVolume(volume);
        }
        
        /**
         * Updates the channel settings. This method is invoked when changes to the
         * channel were made.
         */
        private void
        updateChannelInfo() {
                SamplerChannel sc = getChannelInfo();
                
                screen.updateScreenInfo(sc);
                updateMuteIcon(sc);
                
                if(sc.isSoloChannel()) btnSolo.setIcon(Res.gfxSoloOn);
                else btnSolo.setIcon(Res.gfxSoloOff);
                dialVolume.setValue((int)(sc.getVolume() * 100));
                
                boolean b = sc.getEngine() != null;
                dialVolume.setEnabled(b);
                btnSolo.setEnabled(b);
                btnMute.setEnabled(b);
        }
        
        /**
         * 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(Res.gfxMutedBySolo);
                else if(channel.isMuted()) btnMute.setIcon(Res.gfxMuteOn);
                else btnMute.setIcon(Res.gfxMuteOff);
        }
        
        private class EnhancedDial extends Dial {
                EnhancedDial() {
                        super(0, 100, 0);
                        
                        setMouseHandlerMode(MouseHandlerMode.LEFT_TO_RIGHT_AND_DOWN_TO_UP);
                        
                        int i = preferences().getIntProperty(MAXIMUM_CHANNEL_VOLUME);
                        setMaximum(i);
                        String mcv = MAXIMUM_CHANNEL_VOLUME;
                        preferences().addPropertyChangeListener(mcv, new PropertyChangeListener() {
                                public void
                                propertyChange(PropertyChangeEvent e) {
                                        int j = preferences().getIntProperty(MAXIMUM_CHANNEL_VOLUME);
                                        setMaximum(j);
                                }
                        });
                        
                        addMouseListener(new MouseAdapter() {
                                public void
                                mouseClicked(MouseEvent e) {
                                        if(e.getButton() == e.BUTTON3) {
                                                setValue(getMaximum() / 2);
                                                return;
                                        }
                                        
                                        if(e.getButton() != e.BUTTON1) return;
                                        
                                        if(e.getClickCount() < 2) return;
                                        setValue(getValueByPoint(e.getPoint()));
                                }
                        });
                        
                        addChangeListener(new ChangeListener() {
                                public void
                                stateChanged(ChangeEvent e) { setVolume(); }
                        });
                }
        }
        
        protected void
        onDestroy() {
                CC.getSamplerModel().removeSamplerChannelListListener(getHandler());
                
                screen.onDestroy();
                optionsPane.onDestroy();
        }
        
        private final EventHandler eventHandler = new EventHandler();
        
        private EventHandler
        getHandler() { return eventHandler; }
        
        private class EventHandler implements SamplerChannelListener, SamplerChannelListListener {
                /**
                 * 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) {
                        screen.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) {
                        screen.updateVoiceCount(getModel().getVoiceCount());
                }
                
                /**
                 * 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() == getChannelId()) {
                                onDestroy();
                        }
                }
        }
        
        
        private class PowerButton extends PixmapToggleButton
                        implements ActionListener, PropertyChangeListener {
                
                PowerButton() {
                        super(Res.gfxPowerOff, Res.gfxPowerOn);
                
                        setSelected(true);
                        addActionListener(this);
                }
                
                public void
                actionPerformed(ActionEvent e) {
                        if(!mainPane.isAnimated()) {
                                CC.getSamplerModel().removeBackendChannel(getChannelId());
                                return;
                        }
                        
                        String s = JXCollapsiblePane.ANIMATION_STATE_KEY;
                        mainPane.addPropertyChangeListener(s, this);
                        mainPane.setCollapsed(true);
                }
                
                public void
                propertyChange(PropertyChangeEvent e) {
                        if(e.getNewValue() == "collapsed") {
                                CC.getSamplerModel().removeBackendChannel(getChannelId());
                        }
                }
                
                public boolean
                contains(int x, int y) { return (x - 11)*(x - 11) + (y - 11)*(y - 11) < 71; }
        }
        
        private class MuteButton extends PixmapButton implements ActionListener {
                MuteButton() {
                        super(Res.gfxMuteOff);
                        //setDisabledIcon(Res.gfxMuteSoloDisabled);
                        setDisabledIcon (
                                SubstanceImageCreator.makeTransparent(this, Res.gfxMuteOff, 0.4)
                        );
                        addActionListener(this);
                }
                
                public void
                actionPerformed(ActionEvent e) {
                        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) setIcon(Res.gfxMuteOff);
                                else setIcon(Res.gfxMutedBySolo);
                        } else setIcon(Res.gfxMuteOn);
                        
                        Channel.this.getModel().setBackendMute(b);
                }
                
                public boolean
                contains(int x, int y) { return (x > 5 && x < 23) && (y > 5 && y < 16); }
        }
        
        private class SoloButton extends PixmapButton implements ActionListener {
                SoloButton() {
                        super(Res.gfxSoloOff);
                        //setDisabledIcon(Res.gfxMuteSoloDisabled);
                        setDisabledIcon (
                                SubstanceImageCreator.makeTransparent(this, Res.gfxSoloOff, 0.4)
                        );
                        addActionListener(this);
                }
                
                public void
                actionPerformed(ActionEvent e) {
                        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) {
                                setIcon(Res.gfxSoloOn);
                                if(sc.isMutedBySolo()) btnMute.setIcon(Res.gfxMuteOff);
                        } else {
                                setIcon(Res.gfxSoloOff);
                                if(!sc.isMuted() && CC.getSamplerModel().getSoloChannelCount() > 1)
                                        btnMute.setIcon(Res.gfxMutedBySolo);
                        }
                
                        Channel.this.getModel().setBackendSolo(b);
                }
                
                public boolean
                contains(int x, int y) { return (x > 5 && x < 23) && (y > 5 && y < 16); }
        }
        
        private class OptionsButton extends PixmapToggleButton implements ActionListener {
                OptionsButton() {
                        super(Res.gfxOptionsOff, Res.gfxOptionsOn);
                        setRolloverIcon(Res.gfxOptionsOffRO);
                        this.setRolloverSelectedIcon(Res.gfxOptionsOnRO);
                        addActionListener(this);
                }
                
                public void
                actionPerformed(ActionEvent e) {
                        showOptionsPane(isSelected());
                        
                        String s;
                        if(isSelected()) s = i18n.getButtonLabel("OptionsButton.ttHideOptions");
                        else s = i18n.getButtonLabel("OptionsButton.ttShowOptions");
                        
                        setToolTipText(s);
                }
                
                private void
                showOptionsPane(boolean show) {
                        optionsPane.setCollapsed(!show);
                }
                
                public boolean
                contains(int x, int y) { return super.contains(x, y) & y < 13; }
        }
}

class ChannelPane extends PixmapPane {
        ChannelPane() {
                super(Res.gfxChannel);
                setPixmapInsets(new Insets(3, 3, 3, 3));
        }
}

class ChannelScreen extends PixmapPane {
        private final Channel channel;
        
        private final InstrumentPane instrumentPane;
        
        private JButton btnInstr =
                createScreenButton(i18n.getButtonLabel("ChannelScreen.btnInstr"));
        
        private final JButton btnEditInstr =
                createScreenButton(i18n.getButtonLabel("ChannelScreen.btnEditInstr"));
        private final ScreenButtonBg sbbEditInstr = new ScreenButtonBg(btnEditInstr);
        
        private final JButton btnFxSends =
                createScreenButton(i18n.getButtonLabel("ChannelScreen.btnFxSends"));
        
        private final JButton btnEngine
                = createScreenButton(i18n.getButtonLabel("ChannelScreen.btnEngine"));
        
        private final JPopupMenu menuEngines = new JPopupMenu();
        
        private final JButton btnVolume = createScreenButton("");
        private JSVolumeEditorPopup popupVolume;
        
        private final JLabel lStreams = createScreenLabel(" --");
        private final JLabel lVoices = createScreenLabel("-- ");
        
        private InformationDialog fxSendsDlg = null;
        
        private Timer timer;
        
        private static NumberFormat numberFormat = NumberFormat.getInstance();
        static {
                numberFormat.setMaximumFractionDigits(1);
        }
        
        ChannelScreen(final Channel channel) {
                super(Res.gfxChannelScreen);
                setPixmapInsets(new Insets(6, 6, 6, 6));
                setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
                
                this.channel = channel;
                popupVolume = new JSVolumeEditorPopup(btnVolume, VolumeType.CHANNEL);
                
                setOpaque(false);
                
                setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));
                
                btnInstr.setAlignmentX(CENTER_ALIGNMENT);
                btnInstr.setRolloverEnabled(false);
                btnInstr.setBorder(BorderFactory.createEmptyBorder(3, 0, 0, 0));
                
                instrumentPane = new InstrumentPane();
                add(instrumentPane);
                
                JPanel p = new JPanel();
                p.setLayout(new BoxLayout(p, BoxLayout.X_AXIS));
                p.setAlignmentX(CENTER_ALIGNMENT);
                p.setBorder(BorderFactory.createEmptyBorder(5, 2, 0, 0));
                
                btnFxSends.setToolTipText(i18n.getButtonLabel("ChannelScreen.btnFxSends.tt"));
                btnFxSends.addActionListener(new ActionListener() {
                        public void
                        actionPerformed(ActionEvent e) {
                                if(fxSendsDlg != null && fxSendsDlg.isVisible()) {
                                        fxSendsDlg.toFront();
                                        return;
                                }
                                FxSendsPane p = new FxSendsPane(channel.getModel());
                                int id = channel.getModel().getChannelId();
                                fxSendsDlg = new InformationDialog(CC.getMainFrame(), p);
                                fxSendsDlg.setTitle(i18n.getLabel("FxSendsDlg.title", id));
                                fxSendsDlg.setModal(false);
                                fxSendsDlg.showCloseButton(false);
                                fxSendsDlg.setVisible(true);
                        }
                });
                
                p.add(btnFxSends);
                
                //p.add(Box.createRigidArea(new Dimension(6, 0)));
                p.add(Box.createGlue());
                
                btnEngine.setIcon(Res.iconEngine12);
                btnEngine.setIconTextGap(1);
                p.add(btnEngine);
                //p.add(new Label("|"));
                
                //p.add(Box.createRigidArea(new Dimension(6, 0)));
                
                //p.add(btnReset);
                
                p.add(Box.createGlue());
                
                lStreams.setFont(Res.fontScreenMono);
                lStreams.setHorizontalAlignment(JLabel.RIGHT);
                lStreams.setToolTipText(i18n.getLabel("ChannelScreen.streamVoiceCount"));
                p.add(lStreams);
                
                JLabel l = createScreenLabel("/");
                l.setFont(Res.fontScreenMono);
                l.setToolTipText(i18n.getLabel("ChannelScreen.streamVoiceCount"));
                p.add(l);
                
                lVoices.setFont(Res.fontScreenMono);
                lVoices.setToolTipText(i18n.getLabel("ChannelScreen.streamVoiceCount"));
                p.add(lVoices);
                
                btnVolume.setIcon(Res.iconVolume14);
                btnVolume.setIconTextGap(2);
                btnVolume.setAlignmentX(RIGHT_ALIGNMENT);
                btnVolume.setHorizontalAlignment(btnVolume.LEFT);
                updateVolumeInfo(100);
                Dimension d = btnVolume.getPreferredSize();
                d.width = 60;
                btnVolume.setPreferredSize(d);
                btnVolume.setMinimumSize(d);
                
                btnVolume.addActionListener(new ActionListener() {
                        public void
                        actionPerformed(ActionEvent e) {
                                if(popupVolume.isVisible()) {
                                        popupVolume.commit();
                                        popupVolume.hide();
                                } else {
                                        float vol = channel.getModel().getChannelInfo().getVolume();
                                        popupVolume.setCurrentVolume(vol);
                                        popupVolume.show();
                                }
                        }
                });
                
                popupVolume.addActionListener(new ActionListener() {
                        public void
                        actionPerformed(ActionEvent e) {
                                channel.getModel().setBackendVolume(popupVolume.getVolumeFactor());
                        }
                });
                
                p.add(btnVolume);
                p.setPreferredSize(new Dimension(260, p.getPreferredSize().height));
                p.setMinimumSize(p.getPreferredSize());
                p.setMaximumSize(p.getPreferredSize());
                
                //btnInstr.setBorder(BorderFactory.createEmptyBorder(3, 3, 3, 3));
                p.setOpaque(false);
                add(p);
                
                
                setPreferredSize(new Dimension(270, 48));
                setMinimumSize(getPreferredSize());
                setMaximumSize(getPreferredSize());
                
                createEngineMenu();
                installListeners();
        }
        
        protected void
        onDestroy() { timer.stop(); }
        
        private void
        createEngineMenu() {
                for(final SamplerEngine engine : CC.getSamplerModel().getEngines()) {
                        JMenuItem mi = new JMenuItem(engine.getName() + " engine");
                        mi.setToolTipText(engine.getDescription());
                        
                        mi.addActionListener(new ActionListener() {
                                public void
                                actionPerformed(ActionEvent e) {
                                        channel.getModel().setBackendEngineType(engine.getName());
                                }
                        });
                        
                        menuEngines.add(mi);
                }
        }
        
        private void
        installListeners() {
                btnInstr.addActionListener(new ActionListener() {
                        public void
                        actionPerformed(ActionEvent e) { loadInstrument(); }
                });
                
                btnEditInstr.addActionListener(new ActionListener() {
                        public void
                        actionPerformed(ActionEvent e) {
                                CC.getSamplerModel().editBackendInstrument(channel.getChannelId());
                        }
                });
                
                btnEngine.addActionListener(new ActionListener() {
                        public void
                        actionPerformed(ActionEvent e) {
                                int y = btnEngine.getHeight() + 1;
                                menuEngines.show(btnEngine, 0, y);
                        }
                });
                
                addMouseListener(getHandler());
                addHierarchyListener(getHandler());
                
                ActionListener l = new ActionListener() {
                        public void
                        actionPerformed(ActionEvent e) {
                                if(getMousePosition(true) != null) {
                                        getHandler().mouseEntered(null);
                                } else {
                                        getHandler().mouseExited(null);
                                }
                        }
                };
                timer = new Timer(1000, l);
                timer.start();
        }
        
        private void
        loadInstrument() {
                JSInstrumentChooser dlg = FantasiaUtils.createInstrumentChooser(CC.getMainFrame());
                dlg.setVisible(true);
                
                if(!dlg.isCancelled()) {
                        SamplerChannelModel m = channel.getModel();
                        m.loadBackendInstrument(dlg.getInstrumentFile(), dlg.getInstrumentIndex());
                }
        }
        
        protected void
        updateScreenInfo(SamplerChannel sc) {
                int status = sc.getInstrumentStatus();
                if(status >= 0 && status < 100) {
                        btnInstr.setText(i18n.getLabel("ChannelScreen.loadingInstrument", status));
                } else if(status == -1) {
                        btnInstr.setText(i18n.getButtonLabel("ChannelScreen.btnInstr"));
                } else if(status < -1) {
                         btnInstr.setText(i18n.getLabel("ChannelScreen.errorLoadingInstrument"));
                } else {
                        if(sc.getInstrumentName() != null) btnInstr.setText(sc.getInstrumentName());
                        else btnInstr.setText(i18n.getButtonLabel("ChannelScreen.btnInstr"));
                }
                
                instrumentPane.update();
        
                if(sc.getEngine() != null) {
                        String s = sc.getEngine().getName();
                        s += " engine";
                        if(!s.equals(btnEngine.getText())) {
                                btnEngine.setText(s);
                                btnEngine.setToolTipText(sc.getEngine().getDescription());
                        }
                }
                
        }
        
        protected void
        updateVolumeInfo(int volume) {
                if(CC.getViewConfig().isMeasurementUnitDecibel()) {
                        String s = numberFormat.format(HF.percentsToDecibels(volume));
                        btnVolume.setText(s + "dB");
                } else {
                        btnVolume.setText(String.valueOf(volume) + "%");
                }
        }
        
        /**
         * Updates the number of active disk streams.
         * @param count The new number of active disk streams.
         */
        protected 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.
         */
        protected 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);
        }
        
        class InstrumentPane extends JPanel {
                private final JPanel leftPane = new JPanel();
                private final JPanel rightPane = new JPanel();
                
                InstrumentPane() {
                        setOpaque(false);
                        setLayout(new BoxLayout(this, BoxLayout.X_AXIS));
                        add(leftPane);
                        add(btnInstr);
                        add(rightPane);
                        add(sbbEditInstr);
                        btnEditInstr.setToolTipText(i18n.getLabel("ChannelScreen.btnEditInstr.tt"));
                        sbbEditInstr.setVisible(false);
                        setBorder(BorderFactory.createEmptyBorder(0, 0, 0, 6));
                        
                        update();
                }
                
                public void
                update() {
                        int a = btnInstr.getMinimumSize().width;
                        int b = 0;
                        if(sbbEditInstr.isVisible()) b = sbbEditInstr.getPreferredSize().width;
                        
                        int max = 254 - b;
                        if(a > max) a = max;
                        
                        int h = btnInstr.getPreferredSize().height;
                        btnInstr.setPreferredSize(new Dimension(a, h));
                        h = btnInstr.getMaximumSize().height;
                        btnInstr.setMaximumSize(new Dimension(a, h));
                        
                        
                        int i = (254 - btnInstr.getPreferredSize().width) / 2;
                        
                        int j = i;
                        if(sbbEditInstr.isVisible()) j -= sbbEditInstr.getPreferredSize().width;
                        if(i < 0 || j < 0) i = j = 0;
                        
                        Dimension d = new Dimension(i, 1);
                        leftPane.setMinimumSize(d);
                        leftPane.setPreferredSize(d);
                        leftPane.setMaximumSize(d);
                        
                        d = new Dimension(j, 1);
                        rightPane.setMinimumSize(d);
                        rightPane.setPreferredSize(d);
                        rightPane.setMaximumSize(d);
                        
                        validate();
                }
        }
        
        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;
                }
        }
        
        static class ScreenButtonBg extends PixmapPane {
                ScreenButtonBg(JButton btn) {
                        super(Res.gfxScreenBtnBg);
                        setPixmapInsets(new Insets(4, 4, 4, 4));
                        setLayout(new BoxLayout(this, BoxLayout.X_AXIS));
                        setBorder(BorderFactory.createEmptyBorder(0, 7, 0, 7));
                        add(btn);
                        setPreferredSize(new Dimension(getPreferredSize().width, 13));
                }
                
                public Dimension
                getPreferredSize() {
                        return new Dimension(super.getPreferredSize().width, 13);
                }
        }
        
        
        private final EventHandler eventHandler = new EventHandler();
        
        private EventHandler
        getHandler() { return eventHandler; }
        
        private class EventHandler extends MouseAdapter implements HierarchyListener {
                public void
                mouseEntered(MouseEvent e)  {
                        if(channel.getChannelInfo().getInstrumentStatus() != 100) return;
                        
                        if(!sbbEditInstr.isVisible()) {
                                sbbEditInstr.setVisible(true);
                                instrumentPane.update();
                        }
                }
                
                public void
                mouseExited(MouseEvent e)  {
                        if(getMousePosition(true) != null) return;
                        if(sbbEditInstr.isVisible()) {
                                sbbEditInstr.setVisible(false);
                                instrumentPane.update();
                        }
                }
                
                /** 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);
                        }
                }
        }
}

class ChannelOptions extends JXCollapsiblePane {
        private final Channel channel;
        private MidiDeviceModel midiDevice = null;
        
        private final JComboBox cbMidiDevice = new FantasiaComboBox();
        private final JComboBox cbMidiPort = new FantasiaComboBox();
        private final JComboBox cbMidiChannel = new FantasiaComboBox();
        private final JComboBox cbInstrumentMap = new FantasiaComboBox();
        private final JComboBox cbAudioDevice = new FantasiaComboBox();
        
        private final PixmapButton btnChannelRouting;
        
        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();
        
        ChannelOptions(final Channel channel) {
                setAnimated(false);
                setCollapsed(true);
                setAnimated(preferences().getBoolProperty(ANIMATED));
                
                preferences().addPropertyChangeListener(ANIMATED, new PropertyChangeListener() {
                        public void
                        propertyChange(PropertyChangeEvent e) {
                                setAnimated(preferences().getBoolProperty(ANIMATED));
                        }
                });
                
                PixmapPane bgp = new PixmapPane(Res.gfxChannelOptions);
                bgp.setPixmapInsets(new Insets(1, 1, 1, 1));
                
                this.channel = channel;
                
                bgp.setBorder(BorderFactory.createEmptyBorder(5, 4, 5, 4));
                bgp.setLayout(new BoxLayout(bgp, BoxLayout.X_AXIS));
                
                bgp.setPreferredSize(new Dimension(420, 44));
                bgp.setMinimumSize(getPreferredSize());
                bgp.setMaximumSize(getPreferredSize());
                
                JPanel p = new JPanel();
                p.setBorder(BorderFactory.createEmptyBorder(3, 4, 3, 4));
                p.setLayout(new BoxLayout(p, BoxLayout.Y_AXIS));
                JLabel l = new JLabel(Res.gfxMidiInputTitle);
                l.setAlignmentX(LEFT_ALIGNMENT);
                p.add(l);
                
                JPanel p2 = new JPanel();
                p2.setBorder(BorderFactory.createEmptyBorder(3, 0, 0, 0));
                p2.setLayout(new BoxLayout(p2, BoxLayout.X_AXIS));
                
                Object o = cbMidiDevice.getRenderer();
                if(o instanceof JLabel) ((JLabel )o).setHorizontalAlignment(SwingConstants.CENTER);
                
                cbMidiDevice.setPreferredSize(new Dimension(40, 18));
                cbMidiDevice.setMinimumSize(cbMidiDevice.getPreferredSize());
                cbMidiDevice.setMaximumSize(cbMidiDevice.getPreferredSize());
                p2.add(cbMidiDevice);
                
                p2.add(Box.createRigidArea(new Dimension(3, 0)));
                
                o = cbMidiPort.getRenderer();
                if(o instanceof JLabel) ((JLabel )o).setHorizontalAlignment(SwingConstants.CENTER);
                
                cbMidiPort.setPreferredSize(new Dimension(62, 18));
                cbMidiPort.setMinimumSize(cbMidiPort.getPreferredSize());
                cbMidiPort.setMaximumSize(cbMidiPort.getPreferredSize());
                p2.add(cbMidiPort);
                
                p2.add(Box.createRigidArea(new Dimension(3, 0)));
                
                o = cbMidiChannel.getRenderer();
                if(o instanceof JLabel) ((JLabel )o).setHorizontalAlignment(SwingConstants.CENTER);
                
                cbMidiChannel.addItem("All");
                for(int i = 1; i <= 16; i++) cbMidiChannel.addItem("Channel " + String.valueOf(i));
                cbMidiChannel.setPreferredSize(new Dimension(80, 18));
                cbMidiChannel.setMinimumSize(cbMidiChannel.getPreferredSize());
                cbMidiChannel.setMaximumSize(cbMidiChannel.getPreferredSize());
                
                p2.add(cbMidiChannel);
                p2.setAlignmentX(LEFT_ALIGNMENT);
                p2.setOpaque(false);
                p.add(p2);
                p.setBackground(new java.awt.Color(0x818181));
                
                bgp.add(p);
                
                bgp.add(Box.createRigidArea(new Dimension(4, 0)));
                
                p = new JPanel();
                p.setOpaque(true);
                p.setBorder(BorderFactory.createEmptyBorder(3, 4, 3, 4));
                p.setLayout(new BoxLayout(p, BoxLayout.Y_AXIS));
                l = new JLabel(Res.gfxInstrumentMapTitle);
                l.setAlignmentX(LEFT_ALIGNMENT);
                l.setAlignmentX(LEFT_ALIGNMENT);
                p.add(l);
                
                p.add(Box.createRigidArea(new Dimension(0, 3)));
                
                //o = cbInstrumentMap.getRenderer();
                //if(o instanceof JLabel) ((JLabel )o).setHorizontalAlignment(SwingConstants.CENTER);
                
                cbInstrumentMap.setPreferredSize(new Dimension(126, 18));
                cbInstrumentMap.setMinimumSize(cbInstrumentMap.getPreferredSize());
                cbInstrumentMap.setMaximumSize(cbInstrumentMap.getPreferredSize());
                cbInstrumentMap.setAlignmentX(LEFT_ALIGNMENT);
                p.add(cbInstrumentMap);
                p.setBackground(new java.awt.Color(0x818181));
                bgp.add(p);
                
                bgp.add(Box.createRigidArea(new Dimension(4, 0)));
                
                p = new JPanel();
                p.setOpaque(true);
                p.setBorder(BorderFactory.createEmptyBorder(3, 4, 3, 4));
                p.setLayout(new BoxLayout(p, BoxLayout.Y_AXIS));
                l = new JLabel(Res.gfxAudioOutputTitle);
                l.setAlignmentX(LEFT_ALIGNMENT);
                p.add(l);
                
                //p.add(Box.createRigidArea(new Dimension(0, 3)));
                
                p2 = new JPanel();
                p2.setBorder(BorderFactory.createEmptyBorder(3, 0, 0, 0));
                p2.setLayout(new BoxLayout(p2, BoxLayout.X_AXIS));
                p2.setOpaque(false);
                p2.setAlignmentX(LEFT_ALIGNMENT);
                
                o = cbAudioDevice.getRenderer();
                if(o instanceof JLabel) ((JLabel )o).setHorizontalAlignment(SwingConstants.RIGHT);
                
                cbAudioDevice.setPreferredSize(new Dimension(40, 18));
                cbAudioDevice.setMinimumSize(cbAudioDevice.getPreferredSize());
                cbAudioDevice.setMaximumSize(cbAudioDevice.getPreferredSize());
                
                p2.add(cbAudioDevice);
                p2.add(Box.createRigidArea(new Dimension(3, 0)));
                btnChannelRouting = new PixmapButton(Res.gfxBtnCr, Res.gfxBtnCrRO);
                btnChannelRouting.setPressedIcon(Res.gfxBtnCrRO);
                btnChannelRouting.setEnabled(false);
                btnChannelRouting.setToolTipText(i18n.getLabel("ChannelOptions.routing"));
                
                btnChannelRouting.addActionListener(new ActionListener() {
                        public void
                        actionPerformed(ActionEvent e) {
                                SamplerChannel c = channel.getChannelInfo();
                                new JSChannelOutputRoutingDlg(CC.getMainFrame(), c).setVisible(true);
                        
                        }
                });
                
                p2.add(btnChannelRouting);
                
                p.add(p2);
                p.setBackground(new java.awt.Color(0x818181));
                p2 = new JPanel();
                p2.setLayout(new java.awt.BorderLayout());
                p.add(p2);
                bgp.add(p);
                
                setContentPane(bgp);
                
                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(); }
                });
                
                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 = channel.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(channel.getModel().getChannelInfo().getEngine() == null) {
                        cbInstrumentMap.setEnabled(false);
                }
                
                cbInstrumentMap.addActionListener(new ActionListener() {
                        public void
                        actionPerformed(ActionEvent e) { updateInstrumentMap(); }
                });
                
                CC.getSamplerModel().addMidiInstrumentMapListListener(mapListListener);
                
                cbAudioDevice.addActionListener(new ActionListener() {
                        public void
                        actionPerformed(ActionEvent e) { setBackendAudioDevice(); }
                });
                
                channel.getModel().addSamplerChannelListener(new SamplerChannelAdapter() {
                        public void
                        channelChanged(SamplerChannelEvent e) { updateChannelProperties(); }
                });
                
                CC.getSamplerModel().addMidiDeviceListListener(getHandler());
                CC.getSamplerModel().addAudioDeviceListListener(getHandler());
                
                updateMidiDevices();
                updateAudioDevices();
                updateChannelProperties();
        }
        
        /**
         * Updates the channel settings. This method is invoked when changes to the
         * channel were made.
         */
        private void
        updateChannelProperties() {
                SamplerModel sm = CC.getSamplerModel();
                SamplerChannel sc = channel.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());
                        
                        cbAudioDevice.setSelectedItem(am == null ? null : am.getDeviceInfo());
                        btnChannelRouting.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 = channel.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);
        }
        
        
        private void
        updateInstrumentMap() {
                updateCbInstrumentMapToolTipText();
                
                int id = channel.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;
                
                channel.getModel().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 audio device list.
         */
        private void
        updateAudioDevices() {
                SamplerModel sm = CC.getSamplerModel();
                SamplerChannel sc = channel.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) {
                                channel.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 = channel.getModel().getChannelInfo().getMidiInputPort();
                        cbMidiPort.setSelectedItem(p >= 0 && p < ports.length ? ports[p] : null);
                        
                        cbMidiChannel.setEnabled(true);
                        int c = channel.getModel().getChannelInfo().getMidiInputChannel();
                        cbMidiChannel.setSelectedItem(c == -1 ? "All" : "Channel " + (c + 1));
                }
        }
        
        private void
        setMidiPort() {
                if(isUpdate()) return;
                
                channel.getModel().setBackendMidiInputPort(cbMidiPort.getSelectedIndex());
        }
        
        private void
        setMidiChannel() {
                if(isUpdate()) return;
                
                Object o = cbMidiChannel.getSelectedItem();
                if(o == null) return;
                String s = o.toString();
                
                int c = s.equals("All") ? -1 : Integer.parseInt(s.substring(8)) - 1;
                
                channel.getModel().setBackendMidiInputChannel(c);
        }
        
        private void
        setBackendAudioDevice() {
                if(isUpdate()) return;
                AudioOutputDevice dev = (AudioOutputDevice)cbAudioDevice.getSelectedItem();
                if(dev != null) channel.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; }
        
        protected void
        onDestroy() {
                SamplerModel sm = CC.getSamplerModel();
                
                sm.removeMidiDeviceListListener(getHandler());
                sm.removeAudioDeviceListListener(getHandler());
                sm.removeMidiInstrumentMapListListener(mapListListener);
                sm.removeSamplerListener(samplerListener);
                
                if(midiDevice != null) {
                        midiDevice.removeMidiDeviceListener(getHandler());
                }
        }
        
        private final Handler handler = new Handler();
        
        private Handler
        getHandler() { return handler; }
        
        private class Handler implements MidiDeviceListListener, ListListener<AudioDeviceModel>,
                                        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());
                }
                
                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 = channel.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) { // TODO: ?
                                cbInstrumentMap.setSelectedItem(noMap);
                                cbInstrumentMap.setEnabled(false);
                        }
                }
        }
}