package jmri.jmrit.symbolicprog.tabbedframe;

import java.awt.Color;
import java.awt.Component;
import java.awt.Font;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.io.IOException;
import java.lang.reflect.Field;
import java.util.*;
import javax.swing.AbstractButton;
import javax.swing.BorderFactory;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JProgressBar;
import javax.swing.JScrollPane;
import javax.swing.JSeparator;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.JToggleButton;
import javax.swing.JWindow;
import javax.swing.RowSorter;
import javax.swing.SortOrder;
import javax.swing.SwingConstants;
import javax.swing.table.TableModel;
import javax.swing.table.TableRowSorter;
import jmri.jmrit.roster.RosterEntry;
import jmri.jmrit.symbolicprog.AbstractValue;
import jmri.jmrit.symbolicprog.CvTableModel;
import jmri.jmrit.symbolicprog.CvValue;
import jmri.jmrit.symbolicprog.DccAddressPanel;
import jmri.jmrit.symbolicprog.FnMapPanel;
import jmri.jmrit.symbolicprog.FnMapPanelESU;
import jmri.jmrit.symbolicprog.PrintCvAction;
import jmri.jmrit.symbolicprog.Qualifier;
import jmri.jmrit.symbolicprog.QualifierAdder;
import jmri.jmrit.symbolicprog.SymbolicProgBundle;
import jmri.jmrit.symbolicprog.ValueEditor;
import jmri.jmrit.symbolicprog.CvValueRenderer;
import jmri.jmrit.symbolicprog.VariableTableModel;
import jmri.jmrit.symbolicprog.VariableValue;
import jmri.util.CvUtil;
import jmri.util.StringUtil;
import jmri.util.davidflanagan.HardcopyWriter;
import jmri.util.jdom.LocaleSelector;
import org.jdom2.Attribute;
import org.jdom2.Element;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Provide the individual panes for the TabbedPaneProgrammer.
 * <p>
 * Note that this is not only the panes carrying variables, but also the special
 * purpose panes for the CV table, etc.
 * <p>
 * This class implements PropertyChangeListener so that it can be notified when
 * a variable changes its busy status at the end of a programming read/write
 * operation.
 *
 * There are four read and write operation types, all of which have to be
 * handled carefully:
 * <DL>
 * <DT>Write Changes<DD>This must write changes that occur after the operation
 * starts, because the act of writing a variable/CV may change another. For
 * example, writing CV 1 will mark CV 29 as changed.
 * <p>
 * The definition of "changed" is operationally in the
 * {@link jmri.jmrit.symbolicprog.VariableValue#isChanged} member function.
 *
 * <DT>Write All<DD>Like write changes, this might have to go back and re-write
 * a variable depending on what has previously happened. It should write every
 * variable (at least) once.
 * <DT>Read All<DD>This should read every variable once.
 * <img src="doc-files/PaneProgPane-ReadAllSequenceDiagram.png" alt="UML Sequence diagram">
 * <DT>Read Changes<DD>This should read every variable that's marked as changed.
 * Currently, we use a common definition of changed with the write operations,
 * and that someday might have to change.
 *
 * </DL>
 *
 * @author Bob Jacobsen Copyright (C) 2001, 2003, 2004, 2005, 2006
 * @author D Miller Copyright 2003
 * @author Howard G. Penny Copyright (C) 2005
 * @author Dave Heap Copyright (C) 2014, 2019
 * @see jmri.jmrit.symbolicprog.VariableValue#isChanged
 */
/*
 * @startuml jmri/jmrit/symbolicprog/tabbedframe/doc-files/PaneProgPane-ReadAllSequenceDiagram.png
 * actor User
 * box "PaneProgPane"
 * participant readPaneAll
 * participant prepReadPane
 * participant nextRead
 * participant executeRead
 * participant propertyChange
 * participant replyWhileProgrammingVar
 * participant restartProgramming
 * end box
 * box "VariableValue"
 * participant readAll
 * participant readChanges
 * end box
 *
 * control Programmer
 * User -> readPaneAll: Read All Sheets
 * activate readPaneAll
 * readPaneAll -> prepReadPane
 * activate prepReadPane
 * prepReadPane --> readPaneAll
 * deactivate prepReadPane
 * deactivate prepReadPane
 * readPaneAll -> nextRead
 * activate nextRead
 * nextRead -> executeRead
 * activate executeRead
 * executeRead -> readAll
 * activate readAll
 * readAll -> Programmer
 * activate Programmer
 * readAll --> executeRead
 * deactivate readAll
 * executeRead --> nextRead
 * deactivate executeRead
 * nextRead --> readPaneAll
 * deactivate nextRead
 * deactivate readPaneAll
 * == Callback after read completes ==
 * Programmer -> propertyChange
 * activate propertyChange
 * note over propertyChange
 * if the first read failed,
 * setup a second read of
 * the same value.
 * otherwise, setup a read of
 * the next value.
 * end note
 * deactivate Programmer
 * propertyChange -> User: CV value or error
 * propertyChange -> replyWhileProgrammingVar
 * activate replyWhileProgrammingVar
 * replyWhileProgrammingVar -> restartProgramming
 * activate restartProgramming
 * restartProgramming -> nextRead
 * activate nextRead
 * nextRead -> executeRead
 * activate executeRead
 * executeRead -> readAll
 * activate readAll
 * readAll -> Programmer
 * activate Programmer
 * readAll --> executeRead
 * deactivate readAll
 * executeRead -> nextRead
 * deactivate executeRead
 * nextRead --> restartProgramming
 * deactivate nextRead
 * restartProgramming --> replyWhileProgrammingVar
 * deactivate restartProgramming
 * replyWhileProgrammingVar --> propertyChange
 * deactivate replyWhileProgrammingVar
 * deactivate propertyChange
 * deactivate Programmer
 * == Callback triggered repeat occurs until no more values ==
 * @enduml
 */
public class PaneProgPane extends javax.swing.JPanel
        implements java.beans.PropertyChangeListener {

    static final String LAST_GRIDX = "last_gridx";
    static final String LAST_GRIDY = "last_gridy";

    protected CvTableModel _cvModel;
    protected VariableTableModel _varModel;
    protected PaneContainer container;
    protected RosterEntry rosterEntry;

    boolean _cvTable;

    protected JPanel bottom;

    transient ItemListener l1;
    protected transient ItemListener l2;
    transient ItemListener l3;
    protected transient ItemListener l4;
    transient ItemListener l5;
    transient ItemListener l6;

    boolean isCvTablePane = false;

    /**
     * Store name of this programmer Tab (pane)
     */
    String mName = "";

    /**
     * Construct a null object.
     * <p>
     * Normally only used for tests and to pre-load classes.
     */
    public PaneProgPane() {
    }

    public PaneProgPane(PaneContainer parent, String name, Element pane, CvTableModel cvModel, VariableTableModel varModel, Element modelElem, RosterEntry pRosterEntry) {
        this(parent, name, pane, cvModel, varModel, modelElem, pRosterEntry, false);
    }

    /**
     * Construct the Pane from the XML definition element.
     *
     * @param parent       The parent pane
     * @param name         Name to appear on tab of pane
     * @param pane         The JDOM Element for the pane definition
     * @param cvModel      Already existing TableModel containing the CV
     *                     definitions
     * @param varModel     Already existing TableModel containing the variable
     *                     definitions
     * @param modelElem    "model" element from the Decoder Index, used to check
     *                     what decoder options are present.
     * @param pRosterEntry The current roster entry, used to get sound labels.
     * @param isProgPane   True if the pane is a default programmer pane
     */
    public PaneProgPane(PaneContainer parent, String name, Element pane, CvTableModel cvModel, VariableTableModel varModel, Element modelElem, RosterEntry pRosterEntry, boolean isProgPane) {

        container = parent;
        mName = name;
        _cvModel = cvModel;
        _varModel = varModel;
        rosterEntry = pRosterEntry;

        // when true a cv table with compare was loaded into pane
        _cvTable = false;

        // This is a JPanel containing a JScrollPane, containing a
        // laid-out JPanel
        setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));

        // Add tooltip (if available)
        setToolTipText(jmri.util.jdom.LocaleSelector.getAttribute(pane, "tooltip"));

        // find out whether to display "label" (false) or "item" (true)
        boolean showItem = false;
        Attribute nameFmt = pane.getAttribute("nameFmt");
        if (nameFmt != null && nameFmt.getValue().equals("item")) {
            log.debug("Pane {} will show items, not labels, from decoder file", name);
            showItem = true;
        }
        // put the columns left to right in a panel
        JPanel p = new JPanel();
        panelList.add(p);
        p.setLayout(new BoxLayout(p, BoxLayout.X_AXIS));

        // handle the xml definition
        // for all "column" elements ...
        List<Element> colList = pane.getChildren("column");
        for (Element element : colList) {
            // load each column
            p.add(newColumn(element, showItem, modelElem));
        }
        // for all "row" elements ...
        List<Element> rowList = pane.getChildren("row");
        for (Element element : rowList) {
            // load each row
            p.add(newRow(element, showItem, modelElem));
        }
        // for all "grid" elements ...
        List<Element> gridList = pane.getChildren("grid");
        for (Element element : gridList) {
            // load each grid
            p.add(newGrid(element, showItem, modelElem));
        }
        // for all "group" elements ...
        List<Element> groupList = pane.getChildren("group");
        for (Element element : groupList) {
            // load each group
            p.add(newGroup(element, showItem, modelElem));
        }

        // explain why pane is empty
        if (cvList.isEmpty() && varList.isEmpty() && isProgPane) {
            JPanel pe = new JPanel();
            pe.setLayout(new BoxLayout(pe, BoxLayout.Y_AXIS));
            int line = 1;
            while (line >= 0) {
                try {
                    String msg = SymbolicProgBundle.getMessage("TextTabEmptyExplain" + line);
                    if (msg.isEmpty()) {
                        msg = " ";
                    }
                    JLabel l = new JLabel(msg);
                    l.setAlignmentX(Component.CENTER_ALIGNMENT);
                    pe.add(l);
                    line++;
                } catch (java.util.MissingResourceException e) {  // deliberately runs until exception
                    line = -1;
                }
            }
            add(pe);
            panelList.add(pe);
            return;
        }

        // add glue to the right to allow resize - but this isn't working as expected? Alignment?
        add(Box.createHorizontalGlue());

        add(new JScrollPane(p));

        // add buttons in a new panel
        bottom = new JPanel();
        panelList.add(p);
        bottom.setLayout(new BoxLayout(bottom, BoxLayout.X_AXIS));

        // enable read buttons, if possible, and
        // set their tool tips
        enableReadButtons();

        // add read button listeners
        readChangesButton.addItemListener(l1 = (ItemEvent e) -> {
            if (e.getStateChange() == ItemEvent.SELECTED) {
                readChangesButton.setText(SymbolicProgBundle.getMessage("ButtonStopReadChangesSheet"));
                if (!container.isBusy()) {
                    prepReadPane(true);
                    prepGlassPane(readChangesButton);
                    container.getBusyGlassPane().setVisible(true);
                    readPaneChanges();
                }
            } else {
                stopProgramming();
                readChangesButton.setText(SymbolicProgBundle.getMessage("ButtonReadChangesSheet"));
                if (container.isBusy()) {
                    readChangesButton.setEnabled(false);
                }
            }
        });
        readAllButton.addItemListener(l2 = (ItemEvent e) -> {
            if (e.getStateChange() == ItemEvent.SELECTED) {
                readAllButton.setText(SymbolicProgBundle.getMessage("ButtonStopReadSheet"));
                if (!container.isBusy()) {
                    prepReadPane(false);
                    prepGlassPane(readAllButton);
                    container.getBusyGlassPane().setVisible(true);
                    readPaneAll();
                }
            } else {
                stopProgramming();
                readAllButton.setText(SymbolicProgBundle.getMessage("ButtonReadFullSheet"));
                if (container.isBusy()) {
                    readAllButton.setEnabled(false);
                }
            }
        });

        writeChangesButton.setToolTipText(SymbolicProgBundle.getMessage("TipWriteHighlightedSheet"));
        writeChangesButton.addItemListener(l3 = (ItemEvent e) -> {
            if (e.getStateChange() == ItemEvent.SELECTED) {
                writeChangesButton.setText(SymbolicProgBundle.getMessage("ButtonStopWriteChangesSheet"));
                if (!container.isBusy()) {
                    prepWritePane(true);
                    prepGlassPane(writeChangesButton);
                    container.getBusyGlassPane().setVisible(true);
                    writePaneChanges();
                }
            } else {
                stopProgramming();
                writeChangesButton.setText(SymbolicProgBundle.getMessage("ButtonWriteChangesSheet"));
                if (container.isBusy()) {
                    writeChangesButton.setEnabled(false);
                }
            }
        });

        writeAllButton.setToolTipText(SymbolicProgBundle.getMessage("TipWriteAllSheet"));
        writeAllButton.addItemListener(l4 = (ItemEvent e) -> {
            if (e.getStateChange() == ItemEvent.SELECTED) {
                writeAllButton.setText(SymbolicProgBundle.getMessage("ButtonStopWriteSheet"));
                if (!container.isBusy()) {
                    prepWritePane(false);
                    prepGlassPane(writeAllButton);
                    container.getBusyGlassPane().setVisible(true);
                    writePaneAll();
                }
            } else {
                stopProgramming();
                writeAllButton.setText(SymbolicProgBundle.getMessage("ButtonWriteFullSheet"));
                if (container.isBusy()) {
                    writeAllButton.setEnabled(false);
                }
            }
        });

        // enable confirm buttons, if possible, and
        // set their tool tips
        enableConfirmButtons();

        // add confirm button listeners
        confirmChangesButton.addItemListener(l5 = (ItemEvent e) -> {
            if (e.getStateChange() == ItemEvent.SELECTED) {
                confirmChangesButton.setText(SymbolicProgBundle.getMessage("ButtonStopConfirmChangesSheet"));
                if (!container.isBusy()) {
                    prepConfirmPane(true);
                    prepGlassPane(confirmChangesButton);
                    container.getBusyGlassPane().setVisible(true);
                    confirmPaneChanges();
                }
            } else {
                stopProgramming();
                confirmChangesButton.setText(SymbolicProgBundle.getMessage("ButtonConfirmChangesSheet"));
                if (container.isBusy()) {
                    confirmChangesButton.setEnabled(false);
                }
            }
        });
        confirmAllButton.addItemListener(l6 = (ItemEvent e) -> {
            if (e.getStateChange() == ItemEvent.SELECTED) {
                confirmAllButton.setText(SymbolicProgBundle.getMessage("ButtonStopConfirmSheet"));
                if (!container.isBusy()) {
                    prepConfirmPane(false);
                    prepGlassPane(confirmAllButton);
                    container.getBusyGlassPane().setVisible(true);
                    confirmPaneAll();
                }
            } else {
                stopProgramming();
                confirmAllButton.setText(SymbolicProgBundle.getMessage("ButtonConfirmFullSheet"));
                if (container.isBusy()) {
                    confirmAllButton.setEnabled(false);
                }
            }
        });

//      Only add change buttons to CV tables
        bottom.add(readChangesButton);
        bottom.add(writeChangesButton);
        if (_cvTable) {
            bottom.add(confirmChangesButton);
        }
        bottom.add(readAllButton);
        bottom.add(writeAllButton);
        if (_cvTable) {
            bottom.add(confirmAllButton);
        }

        // don't show buttons if no programmer at all
        if (_cvModel.getProgrammer() != null) {
            add(bottom);
        }
    }

    public void setNoDecoder() {
        readChangesButton.setEnabled(false);
        readAllButton.setEnabled(false);
        writeChangesButton.setEnabled(false);
        writeAllButton.setEnabled(false);
        confirmChangesButton.setEnabled(false);
        confirmAllButton.setEnabled(false);
    }

    @Override
    public String getName() {
        return mName;
    }

    @Override
    public String toString() {
        return getName();
    }

    /**
     * Enable the read all and read changes button if possible. This checks to
     * make sure this is appropriate, given the attached programmer's
     * capability.
     */
    void enableReadButtons() {
        readChangesButton.setToolTipText(SymbolicProgBundle.getMessage("TipReadChangesSheet"));
        readAllButton.setToolTipText(SymbolicProgBundle.getMessage("TipReadAllSheet"));
        if (_cvModel.getProgrammer() != null
                && !_cvModel.getProgrammer().getCanRead()) {
            // can't read, disable the buttons
            readChangesButton.setEnabled(false);
            readAllButton.setEnabled(false);
            // set tooltip to explain why
            readChangesButton.setToolTipText(SymbolicProgBundle.getMessage("TipNoRead"));
            readAllButton.setToolTipText(SymbolicProgBundle.getMessage("TipNoRead"));
        } else {
            readChangesButton.setEnabled(true);
            readAllButton.setEnabled(true);
        }
    }

    /**
     * Enable the compare all and compare changes button if possible. This
     * checks to make sure this is appropriate, given the attached programmer's
     * capability.
     */
    void enableConfirmButtons() {
        confirmChangesButton.setToolTipText(SymbolicProgBundle.getMessage("TipConfirmChangesSheet"));
        confirmAllButton.setToolTipText(SymbolicProgBundle.getMessage("TipConfirmAllSheet"));
        if (_cvModel.getProgrammer() != null
                && !_cvModel.getProgrammer().getCanRead()) {
            // can't read, disable the buttons
            confirmChangesButton.setEnabled(false);
            confirmAllButton.setEnabled(false);
            // set tooltip to explain why
            confirmChangesButton.setToolTipText(SymbolicProgBundle.getMessage("TipNoRead"));
            confirmAllButton.setToolTipText(SymbolicProgBundle.getMessage("TipNoRead"));
        } else {
            confirmChangesButton.setEnabled(true);
            confirmAllButton.setEnabled(true);
        }
    }

    /**
     * This remembers the variables on this pane for the Read/Write sheet
     * operation. They are stored as a list of Integer objects, each of which is
     * the index of the Variable in the VariableTable.
     */
    List<Integer> varList = new ArrayList<>();
    int varListIndex;
    /**
     * This remembers the CVs on this pane for the Read/Write sheet operation.
     * They are stored as a set of Integer objects, each of which is the index
     * of the CV in the CVTable. Note that variables are handled separately, and
     * the CVs that are represented by variables are not entered here. So far
     * (sic), the only use of this is for the cvtable rep.
     */
    protected TreeSet<Integer> cvList = new TreeSet<>(); //  TreeSet is iterated in order
    protected Iterator<Integer> cvListIterator;

    protected JToggleButton readChangesButton = new JToggleButton(SymbolicProgBundle.getMessage("ButtonReadChangesSheet"));
    protected JToggleButton readAllButton = new JToggleButton(SymbolicProgBundle.getMessage("ButtonReadFullSheet"));
    protected JToggleButton writeChangesButton = new JToggleButton(SymbolicProgBundle.getMessage("ButtonWriteChangesSheet"));
    protected JToggleButton writeAllButton = new JToggleButton(SymbolicProgBundle.getMessage("ButtonWriteFullSheet"));
    JToggleButton confirmChangesButton = new JToggleButton(SymbolicProgBundle.getMessage("ButtonConfirmChangesSheet"));
    JToggleButton confirmAllButton = new JToggleButton(SymbolicProgBundle.getMessage("ButtonConfirmFullSheet"));

    /**
     * Estimate the number of CVs that will be accessed when reading or writing
     * the contents of this pane.
     *
     * @param read    true if counting for read, false for write
     * @param changes true if counting for a *Changes operation; false, if
     *                counting for a *All operation
     * @return the total number of CV reads/writes needed for this pane
     */
    public int countOpsNeeded(boolean read, boolean changes) {
        Set<Integer> set = new HashSet<>(cvList.size() + varList.size() + 50);
        return makeOpsNeededSet(read, changes, set).size();
    }

    /**
     * Produce a set of CVs that will be accessed when reading or writing the
     * contents of this pane.
     *
     * @param read    true if counting for read, false for write
     * @param changes true if counting for a *Changes operation; false, if
     *                counting for a *All operation
     * @param set     The set to fill. Any CVs already in here will not be
     *                duplicated, which provides a way to aggregate a set of CVs
     *                across multiple panes.
     * @return the same set as the parameter, for convenient chaining of
     *         operations.
     */
    public Set<Integer> makeOpsNeededSet(boolean read, boolean changes, Set<Integer> set) {

        // scan the variable list
        for (int varNum : varList) {

            VariableValue var = _varModel.getVariable(varNum);

            // must decide whether this one should be counted
            if (!changes || var.isChanged()) {

                CvValue[] cvs = var.usesCVs();
                for (CvValue cv : cvs) {
                    // always of interest
                    if (!changes || VariableValue.considerChanged(cv)) {
                        set.add(Integer.valueOf(cv.number()));
                    }
                }
            }
        }

        return set;
    }

    private void prepGlassPane(AbstractButton activeButton) {
        container.prepGlassPane(activeButton);
    }

    void enableButtons(boolean stat) {
        if (stat) {
            enableReadButtons();
            enableConfirmButtons();
        } else {
            readChangesButton.setEnabled(stat);
            readAllButton.setEnabled(stat);
            confirmChangesButton.setEnabled(stat);
            confirmAllButton.setEnabled(stat);
        }
        writeChangesButton.setEnabled(stat);
        writeAllButton.setEnabled(stat);
    }

    boolean justChanges;

    /**
     * Invoked by "Read changes on sheet" button, this sets in motion a
     * continuing sequence of "read" operations on the variables and
     * CVs in the Pane. Only variables in states marked as "changed" will be
     * read.
     *
     * @return true is a read has been started, false if the pane is complete.
     */
    public boolean readPaneChanges() {
        if (log.isDebugEnabled()) {
            log.debug("readPane starts with {} vars, {} cvs ", varList.size(), cvList.size());
        }
        prepReadPane(true);
        return nextRead();
    }

    /**
     * Prepare this pane for a read operation.
     * <p>
     * The read mechanism only reads variables in certain states (and needs to
     * do that to handle error processing right now), so this is implemented by
     * first setting all variables and CVs on this pane to TOREAD via this
     * method
     *
     * @param onlyChanges true if only reading changes; false if reading all
     */
    public void prepReadPane(boolean onlyChanges) {
        log.debug("start prepReadPane with onlyChanges={}", onlyChanges);
        justChanges = onlyChanges;

        if (isCvTablePane) {
            setCvListFromTable();  // make sure list of CVs up to date if table
        }
        enableButtons(false);
        if (justChanges) {
            readChangesButton.setEnabled(true);
            readChangesButton.setSelected(true);
        } else {
            readAllButton.setSelected(true);
            readAllButton.setEnabled(true);
        }
        if (!container.isBusy()) {
            container.enableButtons(false);
        }
        setToRead(justChanges, true);
        varListIndex = 0;
        cvListIterator = cvList.iterator();
    }

    /**
     * Invoked by "Read Full Sheet" button, this sets in motion a continuing
     * sequence of "read" operations on the variables and CVs in the
     * Pane. The read mechanism only reads variables in certain states (and
     * needs to do that to handle error processing right now), so this is
     * implemented by first setting all variables and CVs on this pane to TOREAD
     * in prepReadPaneAll, then starting the execution.
     *
     * @return true is a read has been started, false if the pane is complete
     */
    public boolean readPaneAll() {
        if (log.isDebugEnabled()) {
            log.debug("readAllPane starts with {} vars, {} cvs ", varList.size(), cvList.size());
        }
        prepReadPane(false);
        // start operation
        return nextRead();
    }

    /**
     * Set the "ToRead" parameter in all variables and CVs on this pane.
     *
     * @param justChanges  true if this is read changes, false if read all
     * @param startProcess true if this is the start of processing, false if
     *                     cleaning up at end
     */
    void setToRead(boolean justChanges, boolean startProcess) {
        if (!container.isBusy()
                || // the frame has already setToRead
                (!startProcess)) {  // we want to setToRead false if the pane's process is being stopped
            for (int varNum : varList) {
                VariableValue var = _varModel.getVariable(varNum);
                if (justChanges) {
                    if (var.isChanged()) {
                        var.setToRead(startProcess);
                    } else {
                        var.setToRead(false);
                    }
                } else {
                    var.setToRead(startProcess);
                }
            }

            if (isCvTablePane) {
                setCvListFromTable();  // make sure list of CVs up to date if table
            }
            for (int cvNum : cvList) {
                CvValue cv = _cvModel.getCvByRow(cvNum);
                if (justChanges) {
                    if (VariableValue.considerChanged(cv)) {
                        cv.setToRead(startProcess);
                    } else {
                        cv.setToRead(false);
                    }
                } else {
                    cv.setToRead(startProcess);
                }
            }
        }
    }

    /**
     * Set the "ToWrite" parameter in all variables and CVs on this pane
     *
     * @param justChanges  true if this is read changes, false if read all
     * @param startProcess true if this is the start of processing, false if
     *                     cleaning up at end
     */
    void setToWrite(boolean justChanges, boolean startProcess) {
        log.debug("start setToWrite method with {},{}", justChanges, startProcess);
        if (!container.isBusy()
                || // the frame has already setToWrite
                (!startProcess)) {  // we want to setToWrite false if the pane's process is being stopped
            log.debug("about to start setToWrite of varList");
            for (int varNum : varList) {
                VariableValue var = _varModel.getVariable(varNum);
                if (justChanges) {
                    if (var.isChanged()) {
                        var.setToWrite(startProcess);
                    } else {
                        var.setToWrite(false);
                    }
                } else {
                    var.setToWrite(startProcess);
                }
            }

            log.debug("about to start setToWrite of cvList");
            if (isCvTablePane) {
                setCvListFromTable();  // make sure list of CVs up to date if table
            }
            for (int cvNum : cvList) {
                CvValue cv = _cvModel.getCvByRow(cvNum);
                if (justChanges) {
                    if (VariableValue.considerChanged(cv)) {
                        cv.setToWrite(startProcess);
                    } else {
                        cv.setToWrite(false);
                    }
                } else {
                    cv.setToWrite(startProcess);
                }
            }
        }
        log.debug("end setToWrite method");
    }

    void executeRead(VariableValue var) {
        setBusy(true);
        // var.setToRead(false);  // variables set this themselves
        if (_programmingVar != null) {
            log.error("listener already set at read start");
        }
        _programmingVar = var;
        _read = true;
        // get notified when that state changes so can repeat
        _programmingVar.addPropertyChangeListener(this);
        // and make the read request
        if (justChanges) {
            _programmingVar.readChanges();
        } else {
            _programmingVar.readAll();
        }
    }

    void executeWrite(VariableValue var) {
        setBusy(true);
        // var.setToWrite(false);   // variables reset themselves when done
        if (_programmingVar != null) {
            log.error("listener already set at write start");
        }
        _programmingVar = var;
        _read = false;
        // get notified when that state changes so can repeat
        _programmingVar.addPropertyChangeListener(this);
        // and make the write request
        if (justChanges) {
            _programmingVar.writeChanges();
        } else {
            _programmingVar.writeAll();
        }
    }

    /**
     * If there are any more read operations to be done on this pane, do the
     * next one.
     * <p>
     * Each invocation of this method reads one variable or CV; completion of
     * that request will cause it to happen again, reading the next one, until
     * there's nothing left to read.
     * @return true is a read has been started, false if the pane is complete.
     */
    boolean nextRead() {
        // look for possible variables
        if (log.isDebugEnabled()) {
            log.debug("nextRead scans {} variables", varList.size());
        }
        while ((varList.size() > 0) && (varListIndex < varList.size())) {
            int varNum = varList.get(varListIndex);
            AbstractValue.ValueState vState = _varModel.getState(varNum);
            VariableValue var = _varModel.getVariable(varNum);
            if (log.isDebugEnabled()) {
                log.debug("nextRead var index {} state {} isToRead: {} label: {}", varNum, vState.getName(), var.isToRead(), var.label());
            }
            varListIndex++;
            if (var.isToRead()) {
                if (log.isDebugEnabled()) {
                    log.debug("start read of variable {}", _varModel.getLabel(varNum));
                }
                executeRead(var);

                log.debug("return from starting var read");
                // the request may have instantaneously been satisfied...
                return true;  // only make one request at a time!
            }
        }
        // found no variables needing read, try CVs
        if (log.isDebugEnabled()) {
            log.debug("nextRead scans {} CVs", cvList.size());
        }
        while (cvListIterator != null && cvListIterator.hasNext()) {
            int cvNum = cvListIterator.next();
            CvValue cv = _cvModel.getCvByRow(cvNum);
            if (log.isDebugEnabled()) {
                log.debug("nextRead cv index {} state {}", cvNum, cv.getState());
            }

            if (cv.isToRead()) {  // always read UNKNOWN state
                log.debug("start read of cv {}", cvNum);
                setBusy(true);
                if (_programmingCV != null) {
                    log.error("listener already set at read start");
                }
                _programmingCV = _cvModel.getCvByRow(cvNum);
                _read = true;
                // get notified when that state changes so can repeat
                _programmingCV.addPropertyChangeListener(this);
                // and make the read request
                // _programmingCV.setToRead(false);  // CVs set this themselves
                _programmingCV.read(_cvModel.getStatusLabel());
                log.debug("return from starting CV read");
                // the request may have instantateously been satisfied...
                return true;  // only make one request at a time!
            }
        }
        // nothing to program, end politely
        log.debug("nextRead found nothing to do");
        readChangesButton.setSelected(false);
        readAllButton.setSelected(false);  // reset both, as that's final state we want
        setBusy(false);
        container.paneFinished();
        return false;
    }

    /**
     * If there are any more compare operations to be done on this pane, do the
     * next one.
     * <p>
     * Each invocation of this method compares one CV; completion of that request
     * will cause it to happen again, reading the next one, until there's
     * nothing left to read.
     *
     * @return true is a compare has been started, false if the pane is
     *         complete.
     */
    boolean nextConfirm() {
        // look for possible CVs
        while (cvListIterator != null && cvListIterator.hasNext()) {
            int cvNum = cvListIterator.next();
            CvValue cv = _cvModel.getCvByRow(cvNum);
            if (log.isDebugEnabled()) {
                log.debug("nextConfirm cv index {} state {}", cvNum, cv.getState());
            }

            if (cv.isToRead()) {
                log.debug("start confirm of cv {}", cvNum);
                setBusy(true);
                if (_programmingCV != null) {
                    log.error("listener already set at confirm start");
                }
                _programmingCV = _cvModel.getCvByRow(cvNum);
                _read = true;
                // get notified when that state changes so can repeat
                _programmingCV.addPropertyChangeListener(this);
                // and make the compare request
                _programmingCV.confirm(_cvModel.getStatusLabel());
                log.debug("return from starting CV confirm");
                // the request may have instantateously been satisfied...
                return true;  // only make one request at a time!
            }
        }
        // nothing to program, end politely
        log.debug("nextConfirm found nothing to do");
        confirmChangesButton.setSelected(false);
        confirmAllButton.setSelected(false);  // reset both, as that's final state we want
        setBusy(false);
        container.paneFinished();
        return false;
    }

    /**
     * Invoked by "Write changes on sheet" button, this sets in motion a
     * continuing sequence of "write" operations on the variables in the Pane.
     * Only variables in isChanged states are written; other states don't need
     * to be.
     *
     * @return true if a write has been started, false if the pane is complete
     */
    public boolean writePaneChanges() {
        log.debug("writePaneChanges starts");
        prepWritePane(true);
        boolean val = nextWrite();
        log.debug("writePaneChanges returns {}", val);
        return val;
    }

    /**
     * Invoked by "Write full sheet" button to write all CVs.
     *
     * @return true if a write has been started, false if the pane is complete
     */
    public boolean writePaneAll() {
        prepWritePane(false);
        return nextWrite();
    }

    /**
     * Prepare a "write full sheet" operation.
     *
     * @param onlyChanges true if only writing changes; false if writing all
     */
    public void prepWritePane(boolean onlyChanges) {
        log.debug("start prepWritePane with {}", onlyChanges);
        justChanges = onlyChanges;
        enableButtons(false);

        if (isCvTablePane) {
            setCvListFromTable();  // make sure list of CVs up to date if table
        }
        if (justChanges) {
            writeChangesButton.setEnabled(true);
            writeChangesButton.setSelected(true);
        } else {
            writeAllButton.setSelected(true);
            writeAllButton.setEnabled(true);
        }
        if (!container.isBusy()) {
            container.enableButtons(false);
        }
        setToWrite(justChanges, true);
        varListIndex = 0;

        cvListIterator = cvList.iterator();
        log.debug("end prepWritePane");
    }

    boolean nextWrite() {
        log.debug("start nextWrite");
        // look for possible variables
        while ((varList.size() > 0) && (varListIndex < varList.size())) {
            int varNum = varList.get(varListIndex);
            AbstractValue.ValueState vState = _varModel.getState(varNum);
            VariableValue var = _varModel.getVariable(varNum);
            if (log.isDebugEnabled()) {
                log.debug("nextWrite var index {} state {} isToWrite: {} label:{}", varNum, vState.getName(), var.isToWrite(), var.label());
            }
            varListIndex++;
            if (var.isToWrite()) {
                log.debug("start write of variable {}", _varModel.getLabel(varNum));

                executeWrite(var);

                log.debug("return from starting var write");
                return true;  // only make one request at a time!
            }
        }
        // check for CVs to handle (e.g. for CV table)
        while (cvListIterator != null && cvListIterator.hasNext()) {
            int cvNum = cvListIterator.next();
            CvValue cv = _cvModel.getCvByRow(cvNum);
            if (log.isDebugEnabled()) {
                log.debug("nextWrite cv index {} state {}", cvNum, cv.getState());
            }

            if (cv.isToWrite()) {
                log.debug("start write of cv index {}", cvNum);
                setBusy(true);
                if (_programmingCV != null) {
                    log.error("listener already set at write start");
                }
                _programmingCV = _cvModel.getCvByRow(cvNum);
                _read = false;
                // get notified when that state changes so can repeat
                _programmingCV.addPropertyChangeListener(this);
                // and make the write request
                // _programmingCV.setToWrite(false);  // CVs set this themselves
                _programmingCV.write(_cvModel.getStatusLabel());
                log.debug("return from starting cv write");
                return true;  // only make one request at a time!
            }
        }
        // nothing to program, end politely
        log.debug("nextWrite found nothing to do");
        writeChangesButton.setSelected(false);
        writeAllButton.setSelected(false);
        setBusy(false);
        container.paneFinished();
        log.debug("return from nextWrite with nothing to do");
        return false;
    }

    /**
     * Prepare this pane for a compare operation.
     * <p>
     * The read mechanism only reads variables in certain states (and needs to
     * do that to handle error processing right now), so this is implemented by
     * first setting all variables and CVs on this pane to TOREAD via this
     * method
     *
     * @param onlyChanges true if only confirming changes; false if confirming
     *                    all
     */
    public void prepConfirmPane(boolean onlyChanges) {
        log.debug("start prepReadPane with onlyChanges={}", onlyChanges);
        justChanges = onlyChanges;
        enableButtons(false);

        if (isCvTablePane) {
            setCvListFromTable();  // make sure list of CVs up to date if table
        }
        if (justChanges) {
            confirmChangesButton.setEnabled(true);
            confirmChangesButton.setSelected(true);
        } else {
            confirmAllButton.setSelected(true);
            confirmAllButton.setEnabled(true);
        }
        if (!container.isBusy()) {
            container.enableButtons(false);
        }
        // we can use the read prep since confirm has to read first
        setToRead(justChanges, true);
        varListIndex = 0;

        cvListIterator = cvList.iterator();
    }

    /**
     * Invoked by "Compare changes on sheet" button, this sets in motion a
     * continuing sequence of "confirm" operations on the variables and
     * CVs in the Pane. Only variables in states marked as "changed" will be
     * checked.
     *
     * @return true is a confirm has been started, false if the pane is
     *         complete.
     */
    public boolean confirmPaneChanges() {
        if (log.isDebugEnabled()) {
            log.debug("confirmPane starts with {} vars, {} cvs ", varList.size(), cvList.size());
        }
        prepConfirmPane(true);
        return nextConfirm();
    }

    /**
     * Invoked by "Compare Full Sheet" button, this sets in motion a continuing
     * sequence of "confirm" operations on the variables and CVs in the
     * Pane. The read mechanism only reads variables in certain states (and
     * needs to do that to handle error processing right now), so this is
     * implemented by first setting all variables and CVs on this pane to TOREAD
     * in prepReadPaneAll, then starting the execution.
     *
     * @return true is a confirm has been started, false if the pane is
     *         complete.
     */
    public boolean confirmPaneAll() {
        if (log.isDebugEnabled()) {
            log.debug("confirmAllPane starts with {} vars, {} cvs ", varList.size(), cvList.size());
        }
        prepConfirmPane(false);
        // start operation
        return nextConfirm();
    }

    // reference to variable being programmed (or null if none)
    VariableValue _programmingVar = null;
    CvValue _programmingCV = null;
    boolean _read = true;

    // busy during read, write operations
    private boolean _busy = false;

    public boolean isBusy() {
        return _busy;
    }

    protected void setBusy(boolean busy) {
        boolean oldBusy = _busy;
        _busy = busy;
        if (!busy && !container.isBusy()) {
            enableButtons(true);
        }
        if (oldBusy != busy) {
            firePropertyChange("Busy", Boolean.valueOf(oldBusy), Boolean.valueOf(busy));
        }
    }

    private int retry = 0;

    /**
     * Get notification of a variable property change, specifically "busy" going
     * to false at the end of a programming operation. If we're in a programming
     * operation, we then continue it by reinvoking the nextRead/writePane
     * operation.
     *
     * @param e the event to respond to
     */
    @Override
    public void propertyChange(java.beans.PropertyChangeEvent e) {
        // check for the right event & condition
        if (_programmingVar == null && _programmingCV == null ) {
            log.warn("unexpected propertChange: {}", e);
            return;
        } else if (log.isDebugEnabled()) {
            log.debug("property changed: {} new value: {}", e.getPropertyName(), e.getNewValue());
        }

        // find the right way to handle this
        if (e.getSource() == _programmingVar
                && e.getPropertyName().equals("Busy")
                && e.getNewValue().equals(Boolean.FALSE)) {
            if (_programmingVar.getState() == AbstractValue.ValueState.UNKNOWN) {
                if (retry == 0) {
                    varListIndex--;
                    retry++;
                    if (_read) {
                        _programmingVar.setToRead(true); // set the variable
                        // to read again.
                    } else {
                        _programmingVar.setToWrite(true); // set the variable
                        // to attempt another
                        // write.
                    }
                } else {
                    retry = 0;
                }
            }
            replyWhileProgrammingVar();
        } else if (e.getSource() == _programmingCV
                && e.getPropertyName().equals("Busy")
                && e.getNewValue().equals(Boolean.FALSE)) {

            // there's no -- operator on the HashSet Iterator we're
            // using for the CV list, so we don't do individual retries
            // now.
            //if (_programmingCV.getState() == CvValue.UNKNOWN) {
            //    if (retry == 0) {
            //        cvListIndex--;
            //        retry++;
            //    } else {
            //        retry = 0;
            //    }
            //}
            replyWhileProgrammingCV();
        } else {
            if (log.isDebugEnabled() && e.getPropertyName().equals("Busy")) {
                log.debug("ignoring change of Busy {} {}", e.getNewValue(), e.getNewValue().equals(Boolean.FALSE));
            }
        }
    }

    public void replyWhileProgrammingVar() {
        log.debug("correct event for programming variable, restart operation");
        // remove existing listener
        _programmingVar.removePropertyChangeListener(this);
        _programmingVar = null;
        // restart the operation
        restartProgramming();
    }

    public void replyWhileProgrammingCV() {
        log.debug("correct event for programming CV, restart operation");
        // remove existing listener
        _programmingCV.removePropertyChangeListener(this);
        _programmingCV = null;
        // restart the operation
        restartProgramming();
    }

    void restartProgramming() {
        log.debug("start restartProgramming");
        if (_read && readChangesButton.isSelected()) {
            nextRead();
        } else if (_read && readAllButton.isSelected()) {
            nextRead();
        } else if (_read && confirmChangesButton.isSelected()) {
            nextConfirm();
        } else if (_read && confirmAllButton.isSelected()) {
            nextConfirm();
        } else if (writeChangesButton.isSelected()) {
            nextWrite();   // was writePaneChanges
        } else if (writeAllButton.isSelected()) {
            nextWrite();
        } else {
            log.debug("No operation to restart");
            if (isBusy()) {
                container.paneFinished();
                setBusy(false);
            }
        }
        log.debug("end restartProgramming");
    }

    protected void stopProgramming() {
        log.debug("start stopProgramming");
        setToRead(false, false);
        setToWrite(false, false);
        varListIndex = varList.size();

        cvListIterator = null;
        log.debug("end stopProgramming");
    }

    /**
     * Create a new group from the JDOM group Element
     *
     * @param element     element containing group contents
     * @param showStdName show the name following the rules for the
     * <em>nameFmt</em> element
     * @param modelElem   element containing the decoder model
     * @return a panel containing the group
     */
    protected JPanel newGroup(Element element, boolean showStdName, Element modelElem) {

        // create a panel to add as a new column or row
        final JPanel c = new JPanel();
        panelList.add(c);
        GridBagLayout g = new GridBagLayout();
        GridBagConstraints cs = new GridBagConstraints();
        c.setLayout(g);

        // handle include/exclude
        if (!PaneProgFrame.isIncludedFE(element, modelElem, rosterEntry, "", "")) {
            return c;
        }

        // handle the xml definition
        // for all elements in the column or row
        List<Element> elemList = element.getChildren();
        log.trace("newColumn starting with {} elements", elemList.size());
        for (Element e : elemList) {

            String name = e.getName();
            log.trace("newGroup processing {} element", name);
            // decode the type
            if (name.equals("display")) { // its a variable
                // load the variable
                newVariable(e, c, g, cs, showStdName);
            } else if (name.equals("separator")) { // its a separator
                JSeparator j = new JSeparator(SwingConstants.HORIZONTAL);
                cs.fill = GridBagConstraints.BOTH;
                cs.gridwidth = GridBagConstraints.REMAINDER;
                g.setConstraints(j, cs);
                c.add(j);
                cs.gridwidth = 1;
            } else if (name.equals("label")) {
                cs.gridwidth = GridBagConstraints.REMAINDER;
                makeLabel(e, c, g, cs);
            } else if (name.equals("soundlabel")) {
                cs.gridwidth = GridBagConstraints.REMAINDER;
                makeSoundLabel(e, c, g, cs);
            } else if (name.equals("cvtable")) {
                makeCvTable(cs, g, c);
            } else if (name.equals("fnmapping")) {
                pickFnMapPanel(c, g, cs, modelElem);
            } else if (name.equals("dccaddress")) {
                JPanel l = addDccAddressPanel(e);
                if (l.getComponentCount() > 0) {
                    cs.gridwidth = GridBagConstraints.REMAINDER;
                    g.setConstraints(l, cs);
                    c.add(l);
                    cs.gridwidth = 1;
                }
            } else if (name.equals("column")) {
                // nested "column" elements ...
                cs.gridheight = GridBagConstraints.REMAINDER;
                JPanel l = newColumn(e, showStdName, modelElem);
                if (l.getComponentCount() > 0) {
                    panelList.add(l);
                    g.setConstraints(l, cs);
                    c.add(l);
                    cs.gridheight = 1;
                }
            } else if (name.equals("row")) {
                // nested "row" elements ...
                cs.gridwidth = GridBagConstraints.REMAINDER;
                JPanel l = newRow(e, showStdName, modelElem);
                if (l.getComponentCount() > 0) {
                    panelList.add(l);
                    g.setConstraints(l, cs);
                    c.add(l);
                    cs.gridwidth = 1;
                }
            } else if (name.equals("grid")) {
                // nested "grid" elements ...
                cs.gridwidth = GridBagConstraints.REMAINDER;
                JPanel l = newGrid(e, showStdName, modelElem);
                if (l.getComponentCount() > 0) {
                    panelList.add(l);
                    g.setConstraints(l, cs);
                    c.add(l);
                    cs.gridwidth = 1;
                }
            } else if (name.equals("group")) {
                // nested "group" elements ...
                JPanel l = newGroup(e, showStdName, modelElem);
                if (l.getComponentCount() > 0) {
                    panelList.add(l);
                    g.setConstraints(l, cs);
                    c.add(l);
                }
            } else if (!name.equals("qualifier")) { // its a mistake
                log.error("No code to handle element of type {} in newColumn", e.getName());
            }
        }
        // add glue to the bottom to allow resize
        if (c.getComponentCount() > 0) {
            c.add(Box.createVerticalGlue());
        }

        // handle qualification if any
        QualifierAdder qa = new QualifierAdder() {
            @Override
            protected Qualifier createQualifier(VariableValue var, String relation, String value) {
                return new JComponentQualifier(c, var, Integer.parseInt(value), relation);
            }

            @Override
            protected void addListener(java.beans.PropertyChangeListener qc) {
                c.addPropertyChangeListener(qc);
            }
        };

        qa.processModifierElements(element, _varModel);
        return c;
    }

    /**
     * Create a new grid group from the JDOM group Element.
     *
     * @param element     element containing group contents
     * @param c           the panel to create the grid in
     * @param g           the layout manager for the panel
     * @param globs       properties to configure g
     * @param showStdName show the name following the rules for the
     * <em>nameFmt</em> element
     * @param modelElem   element containing the decoder model
     */
    protected void newGridGroup(Element element, final JPanel c, GridBagLayout g, GridGlobals globs, boolean showStdName, Element modelElem) {

        // handle include/exclude
        if (!PaneProgFrame.isIncludedFE(element, modelElem, rosterEntry, "", "")) {
            return;
        }

        // handle the xml definition
        // for all elements in the column or row
        List<Element> elemList = element.getChildren();
        log.trace("newColumn starting with {} elements", elemList.size());
        for (Element e : elemList) {

            String name = e.getName();
            log.trace("newGroup processing {} element", name);
            // decode the type
            if (name.equals("griditem")) {
                final JPanel l = newGridItem(e, showStdName, modelElem, globs);
                if (l.getComponentCount() > 0) {
                    panelList.add(l);
                    g.setConstraints(l, globs.gridConstraints);
                    c.add(l);
                    //                     globs.gridConstraints.gridwidth = 1;
                    // handle qualification if any
                    QualifierAdder qa = new QualifierAdder() {
                        @Override
                        protected Qualifier createQualifier(VariableValue var, String relation, String value) {
                            return new JComponentQualifier(l, var, Integer.parseInt(value), relation);
                        }

                        @Override
                        protected void addListener(java.beans.PropertyChangeListener qc) {
                            l.addPropertyChangeListener(qc);
                        }
                    };

                    qa.processModifierElements(e, _varModel);
                }
            } else if (name.equals("group")) {
                // nested "group" elements ...
                newGridGroup(e, c, g, globs, showStdName, modelElem);
            } else if (!name.equals("qualifier")) { // its a mistake
                log.error("No code to handle element of type {} in newColumn", e.getName());
            }
        }
        // add glue to the bottom to allow resize
//         if (c.getComponentCount() > 0) {
//             c.add(Box.createVerticalGlue());
//         }

    }

    /**
     * Create a single column from the JDOM column Element.
     *
     * @param element     element containing column contents
     * @param showStdName show the name following the rules for the
     * <em>nameFmt</em> element
     * @param modelElem   element containing the decoder model
     * @return a panel containing the group
     */
    public JPanel newColumn(Element element, boolean showStdName, Element modelElem) {

        // create a panel to add as a new column or row
        final JPanel c = new JPanel();
        panelList.add(c);
        GridBagLayout g = new GridBagLayout();
        GridBagConstraints cs = new GridBagConstraints();
        c.setLayout(g);

        // handle the xml definition
        // for all elements in the column or row
        List<Element> elemList = element.getChildren();
        log.trace("newColumn starting with {} elements", elemList.size());
        for (Element value : elemList) {

            // update the grid position
            cs.gridy++;
            cs.gridx = 0;

            String name = value.getName();
            log.trace("newColumn processing {} element", name);
            // decode the type
            if (name.equals("display")) { // it's a variable
                // load the variable
                newVariable(value, c, g, cs, showStdName);
            } else if (name.equals("separator")) { // its a separator
                JSeparator j = new JSeparator(SwingConstants.HORIZONTAL);
                cs.fill = GridBagConstraints.BOTH;
                cs.gridwidth = GridBagConstraints.REMAINDER;
                g.setConstraints(j, cs);
                c.add(j);
                cs.gridwidth = 1;
            } else if (name.equals("label")) {
                cs.gridwidth = GridBagConstraints.REMAINDER;
                makeLabel(value, c, g, cs);
            } else if (name.equals("soundlabel")) {
                cs.gridwidth = GridBagConstraints.REMAINDER;
                makeSoundLabel(value, c, g, cs);
            } else if (name.equals("cvtable")) {
                makeCvTable(cs, g, c);
            } else if (name.equals("fnmapping")) {
                pickFnMapPanel(c, g, cs, modelElem);
            } else if (name.equals("dccaddress")) {
                JPanel l = addDccAddressPanel(value);
                if (l.getComponentCount() > 0) {
                    cs.gridwidth = GridBagConstraints.REMAINDER;
                    g.setConstraints(l, cs);
                    c.add(l);
                    cs.gridwidth = 1;
                }
            } else if (name.equals("column")) {
                // nested "column" elements ...
                cs.gridheight = GridBagConstraints.REMAINDER;
                JPanel l = newColumn(value, showStdName, modelElem);
                if (l.getComponentCount() > 0) {
                    panelList.add(l);
                    g.setConstraints(l, cs);
                    c.add(l);
                    cs.gridheight = 1;
                }
            } else if (name.equals("row")) {
                // nested "row" elements ...
                cs.gridwidth = GridBagConstraints.REMAINDER;
                JPanel l = newRow(value, showStdName, modelElem);
                if (l.getComponentCount() > 0) {
                    panelList.add(l);
                    g.setConstraints(l, cs);
                    c.add(l);
                    cs.gridwidth = 1;
                }
            } else if (name.equals("grid")) {
                // nested "grid" elements ...
                cs.gridwidth = GridBagConstraints.REMAINDER;
                JPanel l = newGrid(value, showStdName, modelElem);
                if (l.getComponentCount() > 0) {
                    panelList.add(l);
                    g.setConstraints(l, cs);
                    c.add(l);
                    cs.gridwidth = 1;
                }
            } else if (name.equals("group")) {
                // nested "group" elements ...
                JPanel l = newGroup(value, showStdName, modelElem);
                if (l.getComponentCount() > 0) {
                    panelList.add(l);
                    g.setConstraints(l, cs);
                    c.add(l);
                }
            } else if (!name.equals("qualifier")) { // its a mistake
                log.error("No code to handle element of type {} in newColumn", value.getName());
            }
        }
        // add glue to the bottom to allow resize
        if (c.getComponentCount() > 0) {
            c.add(Box.createVerticalGlue());
        }

        // handle qualification if any
        QualifierAdder qa = new QualifierAdder() {
            @Override
            protected Qualifier createQualifier(VariableValue var, String relation, String value) {
                return new JComponentQualifier(c, var, Integer.parseInt(value), relation);
            }

            @Override
            protected void addListener(java.beans.PropertyChangeListener qc) {
                c.addPropertyChangeListener(qc);
            }
        };

        qa.processModifierElements(element, _varModel);
        return c;
    }

    /**
     * Create a single row from the JDOM column Element
     *
     * @param element     element containing row contents
     * @param showStdName show the name following the rules for the
     * <em>nameFmt</em> element
     * @param modelElem   element containing the decoder model
     * @return a panel containing the group
     */
    public JPanel newRow(Element element, boolean showStdName, Element modelElem) {

        // create a panel to add as a new column or row
        final JPanel c = new JPanel();
        panelList.add(c);
        GridBagLayout g = new GridBagLayout();
        GridBagConstraints cs = new GridBagConstraints();
        c.setLayout(g);

        // handle the xml definition
        // for all elements in the column or row
        List<Element> elemList = element.getChildren();
        log.trace("newRow starting with {} elements", elemList.size());
        for (Element value : elemList) {

            // update the grid position
            cs.gridy = 0;
            cs.gridx++;

            String name = value.getName();
            log.trace("newRow processing {} element", name);
            // decode the type
            if (name.equals("display")) { // its a variable
                // load the variable
                newVariable(value, c, g, cs, showStdName);
            } else if (name.equals("separator")) { // its a separator
                JSeparator j = new JSeparator(SwingConstants.VERTICAL);
                cs.fill = GridBagConstraints.BOTH;
                cs.gridheight = GridBagConstraints.REMAINDER;
                g.setConstraints(j, cs);
                c.add(j);
                cs.fill = GridBagConstraints.NONE;
                cs.gridheight = 1;
            } else if (name.equals("label")) {
                cs.gridheight = GridBagConstraints.REMAINDER;
                makeLabel(value, c, g, cs);
            } else if (name.equals("soundlabel")) {
                cs.gridheight = GridBagConstraints.REMAINDER;
                makeSoundLabel(value, c, g, cs);
            } else if (name.equals("cvtable")) {
                makeCvTable(cs, g, c);
            } else if (name.equals("fnmapping")) {
                pickFnMapPanel(c, g, cs, modelElem);
            } else if (name.equals("dccaddress")) {
                JPanel l = addDccAddressPanel(value);
                if (l.getComponentCount() > 0) {
                    cs.gridheight = GridBagConstraints.REMAINDER;
                    g.setConstraints(l, cs);
                    c.add(l);
                    cs.gridheight = 1;
                }
            } else if (name.equals("column")) {
                // nested "column" elements ...
                cs.gridheight = GridBagConstraints.REMAINDER;
                JPanel l = newColumn(value, showStdName, modelElem);
                if (l.getComponentCount() > 0) {
                    panelList.add(l);
                    g.setConstraints(l, cs);
                    c.add(l);
                    cs.gridheight = 1;
                }
            } else if (name.equals("row")) {
                // nested "row" elements ...
                cs.gridwidth = GridBagConstraints.REMAINDER;
                JPanel l = newRow(value, showStdName, modelElem);
                if (l.getComponentCount() > 0) {
                    panelList.add(l);
                    g.setConstraints(l, cs);
                    c.add(l);
                    cs.gridwidth = 1;
                }
            } else if (name.equals("grid")) {
                // nested "grid" elements ...
                cs.gridwidth = GridBagConstraints.REMAINDER;
                JPanel l = newGrid(value, showStdName, modelElem);
                if (l.getComponentCount() > 0) {
                    panelList.add(l);
                    g.setConstraints(l, cs);
                    c.add(l);
                    cs.gridwidth = 1;
                }
            } else if (name.equals("group")) {
                // nested "group" elements ...
                JPanel l = newGroup(value, showStdName, modelElem);
                if (l.getComponentCount() > 0) {
                    panelList.add(l);
                    g.setConstraints(l, cs);
                    c.add(l);
                }
            } else if (!name.equals("qualifier")) { // its a mistake
                log.error("No code to handle element of type {} in newRow", value.getName());
            }
        }
        // add glue to the bottom to allow resize
        if (c.getComponentCount() > 0) {
            c.add(Box.createVerticalGlue());
        }

        // handle qualification if any
        QualifierAdder qa = new QualifierAdder() {
            @Override
            protected Qualifier createQualifier(VariableValue var, String relation, String value) {
                return new JComponentQualifier(c, var, Integer.parseInt(value), relation);
            }

            @Override
            protected void addListener(java.beans.PropertyChangeListener qc) {
                c.addPropertyChangeListener(qc);
            }
        };

        qa.processModifierElements(element, _varModel);
        return c;
    }

    /**
     * Create a grid from the JDOM Element.
     *
     * @param element     element containing group contents
     * @param showStdName show the name following the rules for the
     * <em>nameFmt</em> element
     * @param modelElem   element containing the decoder model
     * @return a panel containing the group
     */
    public JPanel newGrid(Element element, boolean showStdName, Element modelElem) {

        // create a panel to add as a new grid
        final JPanel c = new JPanel();
        panelList.add(c);
        GridBagLayout g = new GridBagLayout();
        c.setLayout(g);

        GridGlobals globs = new GridGlobals();

        // handle the xml definition
        // for all elements in the grid
        List<Element> elemList = element.getChildren();
        globs.gridAttList = element.getAttributes(); // get grid-level attributes
        log.trace("newGrid starting with {} elements", elemList.size());
        for (Element value : elemList) {
            globs.gridConstraints = new GridBagConstraints();
            String name = value.getName();
            log.trace("newGrid processing {} element", name);
            // decode the type
            if (name.equals("griditem")) {
                JPanel l = newGridItem(value, showStdName, modelElem, globs);
                if (l.getComponentCount() > 0) {
                    panelList.add(l);
                    g.setConstraints(l, globs.gridConstraints);
                    c.add(l);
                    //                     globs.gridConstraints.gridwidth = 1;
                }
            } else if (name.equals("group")) {
                // nested "group" elements ...
                newGridGroup(value, c, g, globs, showStdName, modelElem);
            } else if (!name.equals("qualifier")) { // its a mistake
                log.error("No code to handle element of type {} in newGrid", value.getName());
            }
        }

        // add glue to the bottom to allow resize
        if (c.getComponentCount() > 0) {
            c.add(Box.createVerticalGlue());
        }

        // handle qualification if any
        QualifierAdder qa = new QualifierAdder() {
            @Override
            protected Qualifier createQualifier(VariableValue var, String relation, String value) {
                return new JComponentQualifier(c, var, Integer.parseInt(value), relation);
            }

            @Override
            protected void addListener(java.beans.PropertyChangeListener qc) {
                c.addPropertyChangeListener(qc);
            }
        };

        qa.processModifierElements(element, _varModel);
        return c;
    }

    protected static class GridGlobals {

        public int gridxCurrent = -1;
        public int gridyCurrent = -1;
        public List<Attribute> gridAttList;
        public GridBagConstraints gridConstraints;
    }

    /**
     * Create a grid item from the JDOM Element
     *
     * @param element     element containing grid item contents
     * @param showStdName show the name following the rules for the
     * <em>nameFmt</em> element
     * @param modelElem   element containing the decoder model
     * @param globs       properties to configure the layout
     * @return a panel containing the group
     */
    @edu.umd.cs.findbugs.annotations.SuppressFBWarnings("DP_DO_INSIDE_DO_PRIVILEGED") // setAccessible()
    public JPanel newGridItem(Element element, boolean showStdName, Element modelElem, GridGlobals globs) {

        List<Attribute> itemAttList = element.getAttributes(); // get item-level attributes
        List<Attribute> attList = new ArrayList<>(globs.gridAttList);
        attList.addAll(itemAttList); // merge grid and item-level attributes
//                log.info("New gridtiem -----------------------------------------------");
//                log.info("Attribute list:"+attList);
        attList.add(new Attribute(LAST_GRIDX, ""));
        attList.add(new Attribute(LAST_GRIDY, ""));
//                log.info("Updated Attribute list:"+attList);
//                 Attribute ax = attList.get(attList.size()-2);
//                 Attribute ay = attList.get(attList.size()-1);
//                log.info("ax="+ax+";ay="+ay);
//                log.info("Previous gridxCurrent="+globs.gridxCurrent+";gridyCurrent="+globs.gridyCurrent);
        for (int j = 0; j < attList.size(); j++) {
            Attribute attrib = attList.get(j);
            String attribName = attrib.getName();
            String attribRawValue = attrib.getValue();
            Field constraint;
            String constraintType;
            // make sure we only process the last gridx or gridy attribute in the list
            if (attribName.equals("gridx")) {
                Attribute a = new Attribute(LAST_GRIDX, attribRawValue);
                attList.set(attList.size() - 2, a);
//                        log.info("Moved & Updated Attribute list:"+attList);
                continue; //. don't process now
            }
            if (attribName.equals("gridy")) {
                Attribute a = new Attribute(LAST_GRIDY, attribRawValue);
                attList.set(attList.size() - 1, a);
//                        log.info("Moved & Updated Attribute list:"+attList);
                continue; //. don't process now
            }
            if (attribName.equals(LAST_GRIDX)) { // we must be at end of original list, restore last gridx
                attribName = "gridx";
                if (attribRawValue.equals("")) { // don't process blank (unused)
                    continue;
                }
            }
            if (attribName.equals(LAST_GRIDY)) { // we must be at end of original list, restore last gridy
                attribName = "gridy";
                if (attribRawValue.equals("")) { // don't process blank (unused)
                    continue;
                }
            }
            if ((attribName.equals("gridx") || attribName.equals("gridy")) && attribRawValue.equals("RELATIVE")) {
                attribRawValue = "NEXT"; // NEXT is a synonym for RELATIVE
            }
            if (attribName.equals("gridx") && attribRawValue.equals("CURRENT")) {
                attribRawValue = String.valueOf(Math.max(0, globs.gridxCurrent));
            }
            if (attribName.equals("gridy") && attribRawValue.equals("CURRENT")) {
                attribRawValue = String.valueOf(Math.max(0, globs.gridyCurrent));
            }
            if (attribName.equals("gridx") && attribRawValue.equals("NEXT")) {
                attribRawValue = String.valueOf(++globs.gridxCurrent);
            }
            if (attribName.equals("gridy") && attribRawValue.equals("NEXT")) {
                attribRawValue = String.valueOf(++globs.gridyCurrent);
            }
//                    log.info("attribName="+attribName+";attribRawValue="+attribRawValue);
            try {
                constraint = globs.gridConstraints.getClass().getDeclaredField(attribName);
                constraintType = constraint.getType().toString();
                constraint.setAccessible(true);
            } catch (NoSuchFieldException ex) {
                log.error("Unrecognised attribute \"{}\", skipping", attribName);
                continue;
            }
            switch (constraintType) {
                case "int": {
                    int attribValue;
                    try {
                        attribValue = Integer.parseInt(attribRawValue);
                        constraint.set(globs.gridConstraints, attribValue);
                    } catch (IllegalAccessException ey) {
                        log.error("Unable to set constraint \"{}. IllegalAccessException error thrown.", attribName);
                    } catch (NumberFormatException ex) {
                        try {
                            Field constant = globs.gridConstraints.getClass().getDeclaredField(attribRawValue);
                            constant.setAccessible(true);
                            attribValue = (Integer) GridBagConstraints.class.getField(attribRawValue).get(constant);
                            constraint.set(globs.gridConstraints, attribValue);
                        } catch (NoSuchFieldException ey) {
                            log.error("Invalid value \"{}\" for attribute \"{}\"", attribRawValue, attribName);
                        } catch (IllegalAccessException ey) {
                            log.error("Unable to set constraint \"{}. IllegalAccessException error thrown.", attribName);
                        }
                    }
                    break;
                }
                case "double": {
                    double attribValue;
                    try {
                        attribValue = Double.parseDouble(attribRawValue);
                        constraint.set(globs.gridConstraints, attribValue);
                    } catch (IllegalAccessException ey) {
                        log.error("Unable to set constraint \"{}. IllegalAccessException error thrown.", attribName);
                    } catch (NumberFormatException ex) {
                        log.error("Invalid value \"{}\" for attribute \"{}\"", attribRawValue, attribName);
                    }
                    break;
                }
                case "class java.awt.Insets":
                    try {
                        String[] insetStrings = attribRawValue.split(",");
                        if (insetStrings.length == 4) {
                            Insets attribValue = new Insets(Integer.parseInt(insetStrings[0]), Integer.parseInt(insetStrings[1]), Integer.parseInt(insetStrings[2]), Integer.parseInt(insetStrings[3]));
                            constraint.set(globs.gridConstraints, attribValue);
                        } else {
                            log.error("Invalid value \"{}\" for attribute \"{}\"", attribRawValue, attribName);
                            log.error("Value should be four integers of the form \"top,left,bottom,right\"");
                        }
                    } catch (IllegalAccessException ey) {
                        log.error("Unable to set constraint \"{}. IllegalAccessException error thrown.", attribName);
                    } catch (NumberFormatException ex) {
                        log.error("Invalid value \"{}\" for attribute \"{}\"", attribRawValue, attribName);
                        log.error("Value should be four integers of the form \"top,left,bottom,right\"");
                    }
                    break;
                default:
                    log.error("Required \"{}\" handler for attribute \"{}\" not defined in JMRI code", constraintType, attribName);
                    log.error("Please file a JMRI bug report at https://sourceforge.net/p/jmri/bugs/new/");
                    break;
            }
        }
//                log.info("Updated globs.GridBagConstraints.gridx="+globs.gridConstraints.gridx+";globs.GridBagConstraints.gridy="+globs.gridConstraints.gridy);

        // create a panel to add as a new grid item
        final JPanel c = new JPanel();
        panelList.add(c);
        GridBagLayout g = new GridBagLayout();
        GridBagConstraints cs = new GridBagConstraints();
        c.setLayout(g);

        // handle the xml definition
        // for all elements in the grid item
        List<Element> elemList = element.getChildren();
        log.trace("newGridItem starting with {} elements", elemList.size());
        for (Element value : elemList) {

            // update the grid position
            cs.gridy = 0;
            cs.gridx++;

            String name = value.getName();
            log.trace("newGridItem processing {} element", name);
            // decode the type
            if (name.equals("display")) { // its a variable
                // load the variable
                newVariable(value, c, g, cs, showStdName);
            } else if (name.equals("separator")) { // its a separator
                JSeparator j = new JSeparator(SwingConstants.VERTICAL);
                cs.fill = GridBagConstraints.BOTH;
                cs.gridheight = GridBagConstraints.REMAINDER;
                g.setConstraints(j, cs);
                c.add(j);
                cs.fill = GridBagConstraints.NONE;
                cs.gridheight = 1;
            } else if (name.equals("label")) {
                cs.gridheight = GridBagConstraints.REMAINDER;
                makeLabel(value, c, g, cs);
            } else if (name.equals("soundlabel")) {
                cs.gridheight = GridBagConstraints.REMAINDER;
                makeSoundLabel(value, c, g, cs);
            } else if (name.equals("cvtable")) {
                makeCvTable(cs, g, c);
            } else if (name.equals("fnmapping")) {
                pickFnMapPanel(c, g, cs, modelElem);
            } else if (name.equals("dccaddress")) {
                JPanel l = addDccAddressPanel(value);
                if (l.getComponentCount() > 0) {
                    cs.gridheight = GridBagConstraints.REMAINDER;
                    g.setConstraints(l, cs);
                    c.add(l);
                    cs.gridheight = 1;
                }
            } else if (name.equals("column")) {
                // nested "column" elements ...
                cs.gridheight = GridBagConstraints.REMAINDER;
                JPanel l = newColumn(value, showStdName, modelElem);
                if (l.getComponentCount() > 0) {
                    panelList.add(l);
                    g.setConstraints(l, cs);
                    c.add(l);
                    cs.gridheight = 1;
                }
            } else if (name.equals("row")) {
                // nested "row" elements ...
                cs.gridwidth = GridBagConstraints.REMAINDER;
                JPanel l = newRow(value, showStdName, modelElem);
                if (l.getComponentCount() > 0) {
                    panelList.add(l);
                    g.setConstraints(l, cs);
                    c.add(l);
                    cs.gridwidth = 1;
                }
            } else if (name.equals("grid")) {
                // nested "grid" elements ...
                cs.gridwidth = GridBagConstraints.REMAINDER;
                JPanel l = newGrid(value, showStdName, modelElem);
                if (l.getComponentCount() > 0) {
                    panelList.add(l);
                    g.setConstraints(l, cs);
                    c.add(l);
                    cs.gridwidth = 1;
                }
            } else if (name.equals("group")) {
                // nested "group" elements ...
                JPanel l = newGroup(value, showStdName, modelElem);
                if (l.getComponentCount() > 0) {
                    panelList.add(l);
                    g.setConstraints(l, cs);
                    c.add(l);
                }
            } else if (!name.equals("qualifier")) { // its a mistake
                log.error("No code to handle element of type {} in newGridItem", value.getName());
            }
        }

        globs.gridxCurrent = globs.gridConstraints.gridx;
        globs.gridyCurrent = globs.gridConstraints.gridy;
//                log.info("Updated gridxCurrent="+globs.gridxCurrent+";gridyCurrent="+globs.gridyCurrent);

        // add glue to the bottom to allow resize
        if (c.getComponentCount() > 0) {
            c.add(Box.createVerticalGlue());
        }

        // handle qualification if any
        QualifierAdder qa = new QualifierAdder() {
            @Override
            protected Qualifier createQualifier(VariableValue var, String relation, String value) {
                return new JComponentQualifier(c, var, Integer.parseInt(value), relation);
            }

            @Override
            protected void addListener(java.beans.PropertyChangeListener qc) {
                c.addPropertyChangeListener(qc);
            }
        };

        qa.processModifierElements(element, _varModel);
        return c;
    }

    /**
     * Create label from Element.
     *
     * @param e  element containing label contents
     * @param c  panel to insert label into
     * @param g  panel layout manager
     * @param cs constraints on layout manager
     */
    protected void makeLabel(Element e, JPanel c, GridBagLayout g, GridBagConstraints cs) {
        String text = LocaleSelector.getAttribute(e, "text");
        if (text == null || text.equals("")) {
            text = LocaleSelector.getAttribute(e, "label"); // label subelement not since 3.7.5
        }
        final JLabel l = new JLabel(text);
        l.setAlignmentX(1.0f);
        cs.fill = GridBagConstraints.BOTH;
        log.trace("Add label: {} cs: {} fill: {} x: {} y: {}",
                l.getText(), cs.gridwidth, cs.fill, cs.gridx, cs.gridy);
        g.setConstraints(l, cs);
        c.add(l);
        cs.fill = GridBagConstraints.NONE;
        cs.gridwidth = 1;
        cs.gridheight = 1;

        // handle qualification if any
        QualifierAdder qa = new QualifierAdder() {
            @Override
            protected Qualifier createQualifier(VariableValue var, String relation, String value) {
                return new JComponentQualifier(l, var, Integer.parseInt(value), relation);
            }

            @Override
            protected void addListener(java.beans.PropertyChangeListener qc) {
                l.addPropertyChangeListener(qc);
            }
        };

        qa.processModifierElements(e, _varModel);
    }

    /**
     * Create sound label from Element.
     *
     * @param e  element containing label contents
     * @param c  panel to insert label into
     * @param g  panel layout manager
     * @param cs constraints on layout manager
     */
    protected void makeSoundLabel(Element e, JPanel c, GridBagLayout g, GridBagConstraints cs) {
        String labelText = rosterEntry.getSoundLabel(Integer.parseInt(Objects.requireNonNull(LocaleSelector.getAttribute(e, "num"))));
        final JLabel l = new JLabel(labelText);
        l.setAlignmentX(1.0f);
        cs.fill = GridBagConstraints.BOTH;
        if (log.isDebugEnabled()) {
            log.debug("Add soundlabel: {} cs: {} {} {} {}", l.getText(), cs.gridwidth, cs.fill, cs.gridx, cs.gridy);
        }
        g.setConstraints(l, cs);
        c.add(l);
        cs.fill = GridBagConstraints.NONE;
        cs.gridwidth = 1;
        cs.gridheight = 1;

        // handle qualification if any
        QualifierAdder qa = new QualifierAdder() {
            @Override
            protected Qualifier createQualifier(VariableValue var, String relation, String value) {
                return new JComponentQualifier(l, var, Integer.parseInt(value), relation);
            }

            @Override
            protected void addListener(java.beans.PropertyChangeListener qc) {
                l.addPropertyChangeListener(qc);
            }
        };

        qa.processModifierElements(e, _varModel);
    }

    void makeCvTable(GridBagConstraints cs, GridBagLayout g, JPanel c) {
        log.debug("starting to build CvTable pane");

        TableRowSorter<TableModel> sorter = new TableRowSorter<>(_cvModel);

        JTable cvTable = new JTable(_cvModel);

        sorter.setComparator(CvTableModel.NUMCOLUMN, new jmri.jmrit.symbolicprog.CVNameComparator());

        List<RowSorter.SortKey> sortKeys = new ArrayList<>();
        sortKeys.add(new RowSorter.SortKey(0, SortOrder.ASCENDING));
        sorter.setSortKeys(sortKeys);

        cvTable.setRowSorter(sorter);

        cvTable.setDefaultRenderer(JTextField.class, new CvValueRenderer());
        cvTable.setDefaultRenderer(JButton.class, new CvValueRenderer());
        cvTable.setDefaultRenderer(String.class, new CvValueRenderer());
        cvTable.setDefaultRenderer(Integer.class, new CvValueRenderer());
        cvTable.setDefaultEditor(JTextField.class, new ValueEditor());
        cvTable.setDefaultEditor(JButton.class, new ValueEditor());
        cvTable.setRowHeight(new JButton("X").getPreferredSize().height);
        // have to shut off autoResizeMode to get horizontal scroll to work (JavaSwing p 541)
        // instead of forcing the columns to fill the frame (and only fill)
        //cvTable.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
        JScrollPane cvScroll = new JScrollPane(cvTable);
        cvScroll.setColumnHeaderView(cvTable.getTableHeader());

        cs.fill = GridBagConstraints.BOTH;
        cs.weighty = 2.0;
        cs.weightx = 0.75;
        g.setConstraints(cvScroll, cs);
        c.add(cvScroll);

        // remember which CVs to read/write
        isCvTablePane = true;
        setCvListFromTable();

        _cvTable = true;
        log.debug("end of building CvTable pane");
    }

    void setCvListFromTable() {
        // remember which CVs to read/write
        for (int j = 0; j < _cvModel.getRowCount(); j++) {
            cvList.add(j);
        }
        _varModel.setButtonModeFromProgrammer();
    }

    /**
     * Pick an appropriate function map panel depending on model attribute.
     * <dl>
     * <dt>If attribute extFnsESU="yes":</dt>
     * <dd>Invoke
     * {@code FnMapPanelESU(VariableTableModel v, List<Integer> varsUsed, Element model)}</dd>
     * <dt>Otherwise:</dt>
     * <dd>Invoke
     * {@code FnMapPanel(VariableTableModel v, List<Integer> varsUsed, Element model)}</dd>
     * </dl>
     *
     * @param modelElem element containing model attributes
     * @param c         panel to add function map panel to
     * @param g         panel layout manager
     * @param cs        constraints on layout manager
     */
    // why does this use a different parameter order than all similar methods?
    void pickFnMapPanel(JPanel c, GridBagLayout g, GridBagConstraints cs, Element modelElem) {
        boolean extFnsESU = false;
        Attribute a = modelElem.getAttribute("extFnsESU");
        try {
            if (a != null) {
                extFnsESU = !(a.getValue()).equalsIgnoreCase("no");
            }
        } catch (Exception ex) {
            log.error("error handling decoder's extFnsESU value");
        }
        if (extFnsESU) {
            FnMapPanelESU l = new FnMapPanelESU(_varModel, varList, modelElem, rosterEntry, _cvModel);
            fnMapListESU.add(l); // remember for deletion
            cs.gridwidth = GridBagConstraints.REMAINDER;
            g.setConstraints(l, cs);
            c.add(l);
        } else {
            FnMapPanel l = new FnMapPanel(_varModel, varList, modelElem);
            fnMapList.add(l); // remember for deletion
            cs.gridwidth = GridBagConstraints.REMAINDER;
            g.setConstraints(l, cs);
            c.add(l);
        }
        cs.gridwidth = 1;
    }

    /**
     * Add the representation of a single variable. The variable is defined by a
     * JDOM variable Element from the XML file.
     *
     * @param var         element containing variable
     * @param col         column to insert label into
     * @param g           panel layout manager
     * @param cs          constraints on layout manager
     * @param showStdName show the name following the rules for the
     * <em>nameFmt</em> element
     */
    public void newVariable(Element var, JComponent col,
            GridBagLayout g, GridBagConstraints cs, boolean showStdName) {

        // get the name
        String name = var.getAttribute("item").getValue();

        // if it doesn't exist, do nothing
        int i = _varModel.findVarIndex(name);
        if (i < 0) {
            log.trace("Variable \"{}\" not found, omitted", name);
            return;
        }
//        Leave here for now. Need to track pre-existing corner-case issue
//        log.info("Entry item="+name+";cs.gridx="+cs.gridx+";cs.gridy="+cs.gridy+";cs.anchor="+cs.anchor+";cs.ipadx="+cs.ipadx);

        // check label orientation
        Attribute attr;
        String layout = "left";  // this default is also set in the DTD
        if ((attr = var.getAttribute("layout")) != null && attr.getValue() != null) {
            layout = attr.getValue();
        }

        // load label if specified, else use name
        String label = name;
        if (!showStdName) {
            // get name attribute from variable, as that's the mfg name
            label = _varModel.getLabel(i);
        }
        String temp = LocaleSelector.getAttribute(var, "label");
        if (temp != null) {
            label = temp;
        }

        // get representation; store into the list to be programmed
        JComponent rep = getRepresentation(name, var);
        varList.add(i);

        // create the paired label
        JLabel l = new WatchingLabel(label, rep);

        int spaceWidth = getFontMetrics(l.getFont()).stringWidth(" ");

        // now handle the four orientations
        // assemble v from label, rep
        switch (layout) {
            case "left":
                cs.anchor = GridBagConstraints.EAST;
                cs.ipadx = spaceWidth;
                g.setConstraints(l, cs);
                col.add(l);
                cs.ipadx = 0;
                cs.gridx++;
                cs.anchor = GridBagConstraints.WEST;
                g.setConstraints(rep, cs);
                col.add(rep);
                break;
//        log.info("Exit item="+name+";cs.gridx="+cs.gridx+";cs.gridy="+cs.gridy+";cs.anchor="+cs.anchor+";cs.ipadx="+cs.ipadx);
            case "right":
                cs.anchor = GridBagConstraints.EAST;
                g.setConstraints(rep, cs);
                col.add(rep);
                cs.gridx++;
                cs.anchor = GridBagConstraints.WEST;
                cs.ipadx = spaceWidth;
                g.setConstraints(l, cs);
                col.add(l);
                cs.ipadx = 0;
                break;
            case "below":
                // variable in center of upper line
                cs.anchor = GridBagConstraints.CENTER;
                g.setConstraints(rep, cs);
                col.add(rep);
                // label aligned like others
                cs.gridy++;
                cs.anchor = GridBagConstraints.WEST;
                cs.ipadx = spaceWidth;
                g.setConstraints(l, cs);
                col.add(l);
                cs.ipadx = 0;
                break;
            case "above":
                // label aligned like others
                cs.anchor = GridBagConstraints.WEST;
                cs.ipadx = spaceWidth;
                g.setConstraints(l, cs);
                col.add(l);
                cs.ipadx = 0;
                // variable in center of lower line
                cs.gridy++;
                cs.anchor = GridBagConstraints.CENTER;
                g.setConstraints(rep, cs);
                col.add(rep);
                break;
            default:
                log.error("layout internally inconsistent: {}", layout);
        }
    }

    /**
     * Get a GUI representation of a particular variable for display.
     *
     * @param name Name used to look up the Variable object
     * @param var  XML Element which might contain a "format" attribute to be
     *             used in the {@link VariableValue#getNewRep} call from the
     *             Variable object; "tooltip" elements are also processed here.
     * @return JComponent representing this variable
     */
    public JComponent getRepresentation(String name, Element var) {
        int i = _varModel.findVarIndex(name);
        VariableValue variable = _varModel.getVariable(i);
        JComponent rep = null;
        String format = "default";
        Attribute attr;
        if ((attr = var.getAttribute("format")) != null && attr.getValue() != null) {
            format = attr.getValue();
        }

        boolean viewOnly = (var.getAttribute("viewOnly") != null &&
                var.getAttribute("viewOnly").getValue().equals("yes"));

        if (i >= 0) {
            rep = getRep(i, format);
            rep.setMaximumSize(rep.getPreferredSize());
            // set tooltip if specified here & not overridden by defn in Variable
            String tip = LocaleSelector.getAttribute(var, "tooltip");
            if (rep.getToolTipText() != null) {
                tip = rep.getToolTipText();
            }
            rep.setToolTipText(modifyToolTipText(tip, variable));
            if (viewOnly) {
            rep.setEnabled(false);
            }
        }
        return rep;
    }

    /**
     * Takes default tool tip text, e.g. from the decoder element, and modifies
     * it as needed.
     * <p>
     * Intended to handle e.g. adding CV numbers to variables.
     *
     * @param start    existing tool tip text
     * @param variable the CV
     * @return new tool tip text
     */
    String modifyToolTipText(String start, VariableValue variable) {
        log.trace("modifyToolTipText: {}", variable.label());
        // this is the place to invoke VariableValue methods to (conditionally)
        // add information about CVs, etc in the ToolTip text

        // Optionally add CV numbers based on Roster Preferences setting
        start = CvUtil.addCvDescription(start, variable.getCvDescription(), variable.getMask());

        // Indicate what the command station can do
        // need to update this with e.g. the specific CV numbers
        if (_cvModel.getProgrammer() != null
                && !_cvModel.getProgrammer().getCanRead()) {
            start = StringUtil.concatTextHtmlAware(start, SymbolicProgBundle.getMessage("TipHardwareCannotRead"));
        }
        if (_cvModel.getProgrammer() != null
                && !_cvModel.getProgrammer().getCanWrite()) {
            start = StringUtil.concatTextHtmlAware(start, SymbolicProgBundle.getMessage("TipHardwareCannotWrite"));
        }

        // indicate other reasons for read/write constraints
        if (variable.getReadOnly()) {
            start = StringUtil.concatTextHtmlAware(start, SymbolicProgBundle.getMessage("TipDefinedToBeReadOnly"));
        }
        if (variable.getWriteOnly()) {
            start = StringUtil.concatTextHtmlAware(start, SymbolicProgBundle.getMessage("TipDefinedToBeWriteOnly"));
        }

        return start;
    }

    JComponent getRep(int i, String format) {
        return (JComponent) (_varModel.getRep(i, format));
    }

    /**
     * list of fnMapping objects to dispose
     */
    ArrayList<FnMapPanel> fnMapList = new ArrayList<>();
    ArrayList<FnMapPanelESU> fnMapListESU = new ArrayList<>();
    /**
     * list of JPanel objects to removeAll
     */
    ArrayList<JPanel> panelList = new ArrayList<>();

    public void dispose() {
        log.debug("dispose");

        // remove components
        removeAll();

        readChangesButton.removeItemListener(l1);
        readAllButton.removeItemListener(l2);
        writeChangesButton.removeItemListener(l3);
        writeAllButton.removeItemListener(l4);
        confirmChangesButton.removeItemListener(l5);
        confirmAllButton.removeItemListener(l6);
        l1 = l2 = l3 = l4 = l5 = l6 = null;

        if (_programmingVar != null) {
            _programmingVar.removePropertyChangeListener(this);
        }
        if (_programmingCV != null) {
            _programmingCV.removePropertyChangeListener(this);
        }

        _programmingVar = null;
        _programmingCV = null;

        varList.clear();
        varList = null;
        cvList.clear();
        cvList = null;

        // dispose of any panels
        for (JPanel jPanel : panelList) {
            jPanel.removeAll();
        }
        panelList.clear();
        panelList = null;

        // dispose of any fnMaps
        for (FnMapPanel fnMapPanel : fnMapList) {
            fnMapPanel.dispose();
        }
        fnMapList.clear();
        fnMapList = null;

        // dispose of any fnMaps
        for (FnMapPanelESU fnMapPanelESU : fnMapListESU) {
            fnMapPanelESU.dispose();
        }
        fnMapListESU.clear();
        fnMapListESU = null;

        readChangesButton = null;
        writeChangesButton = null;

        // these are disposed elsewhere
        _cvModel = null;
        _varModel = null;
    }

    /**
     * Check if varList and cvList, and thus the tab, is empty.
     *
     * @return true if empty
     */
    public boolean isEmpty() {
        return (varList.isEmpty() && cvList.isEmpty());
    }

    public boolean includeInPrint() {
        return print;
    }

    public void includeInPrint(boolean inc) {
        print = inc;
    }
    boolean print = false;

    public void printPane(HardcopyWriter w) {
        // if pane is empty, don't print anything
        if (isEmpty()) {
            return;
        }

        // Define column widths for name and value output.
        // Make col 2 slightly larger than col 1 and reduce both to allow for
        // extra spaces that will be added during concatenation
        int col1Width = w.getCharactersPerLine() / 2 - 3 - 5;
        int col2Width = w.getCharactersPerLine() / 2 - 3 + 5;

        try {
            //Create a string of spaces the width of the first column
            StringBuilder spaces = new StringBuilder();
            spaces.append(" ".repeat(Math.max(0, col1Width)));
            // start with pane name in bold
            String heading1 = SymbolicProgBundle.getMessage("PrintHeadingField");
            String heading2 = SymbolicProgBundle.getMessage("PrintHeadingSetting");
            String s;
            int interval = spaces.length() - heading1.length();
            w.setFontStyle(Font.BOLD);
            // write the section name and dividing line
            s = mName;
            w.write(s, 0, s.length());
            w.writeBorders();
            //Draw horizontal dividing line for each Pane section
            w.write(w.getCurrentLineNumber(), 0, w.getCurrentLineNumber(),
                    w.getCharactersPerLine() + 1);
            s = "\n";
            w.write(s, 0, s.length());
            // if this isn't the raw CV section, write the column headings
            if (cvList.isEmpty()) {
                w.setFontStyle(Font.BOLD + Font.ITALIC);
                s = "   " + heading1 + spaces.substring(0, interval) + "   " + heading2;
                w.write(s, 0, s.length());
                w.writeBorders();
                s = "\n";
                w.write(s, 0, s.length());
            }
            w.setFontStyle(Font.PLAIN);
            // Define a vector to store the names of variables that have been printed
            // already.  If they have been printed, they will be skipped.
            // Using a vector here since we don't know how many variables will
            // be printed and it allows expansion as necessary
            ArrayList<String> printedVariables = new ArrayList<>(10);
            // index over variables
            for (int varNum : varList) {
                VariableValue var = _varModel.getVariable(varNum);
                String name = var.label();
                if (name == null) {
                    name = var.item();
                }
                // Check if variable has been printed.  If not store it and print
                boolean alreadyPrinted = false;
                for (String printedVariable : printedVariables) {
                    if (name.equals(printedVariable)) {
                        alreadyPrinted = true;
                        break;
                    }
                }
                // If already printed, skip it.  If not, store it and print
                if (alreadyPrinted) {
                    continue;
                }
                printedVariables.add(name);

                String value = var.getTextValue();
                String originalName = name;
                String originalValue = value;
                name = name + " (CV" + var.getCvNum() + ")"; // NO I18N

                // define index values for name and value substrings
                int nameLeftIndex = 0;
                int nameRightIndex = name.length();
                int valueLeftIndex = 0;
                int valueRightIndex = value.length();
                String trimmedName;
                String trimmedValue;

                // Check the name length to see if it is wider than the column.
                // If so, split it and do the same checks for the Value
                // Then concatenate the name and value (or the split versions thereof)
                // before writing - if split, repeat until all pieces have been output
                while ((valueLeftIndex < value.length()) || (nameLeftIndex < name.length())) {
                    // name split code
                    if (name.substring(nameLeftIndex).length() > col1Width) {
                        for (int j = 0; j < col1Width; j++) {
                            String delimiter = name.substring(nameLeftIndex + col1Width - j - 1, nameLeftIndex + col1Width - j);
                            if (delimiter.equals(" ") || delimiter.equals(";") || delimiter.equals(",")) {
                                nameRightIndex = nameLeftIndex + col1Width - j;
                                break;
                            }
                        }
                        trimmedName = name.substring(nameLeftIndex, nameRightIndex);
                        nameLeftIndex = nameRightIndex;
                        int space = spaces.length() - trimmedName.length();
                        s = "   " + trimmedName + spaces.substring(0, space);
                    } else {
                        trimmedName = name.substring(nameLeftIndex);
                        int space = spaces.length() - trimmedName.length();
                        s = "   " + trimmedName + spaces.substring(0, space);
                        name = "";
                        nameLeftIndex = 0;
                    }
                    // value split code
                    if (value.substring(valueLeftIndex).length() > col2Width) {
                        for (int j = 0; j < col2Width; j++) {
                            String delimiter = value.substring(valueLeftIndex + col2Width - j - 1, valueLeftIndex + col2Width - j);
                            if (delimiter.equals(" ") || delimiter.equals(";") || delimiter.equals(",")) {
                                valueRightIndex = valueLeftIndex + col2Width - j;
                                break;
                            }
                        }
                        trimmedValue = value.substring(valueLeftIndex, valueRightIndex);
                        valueLeftIndex = valueRightIndex;
                        s = s + "   " + trimmedValue;
                    } else {
                        trimmedValue = value.substring(valueLeftIndex);
                        s = s + "   " + trimmedValue;
                        valueLeftIndex = 0;
                        value = "";
                    }
                    w.write(s, 0, s.length());
                    w.writeBorders();
                    s = "\n";
                    w.write(s, 0, s.length());
                }
                // Check for a Speed Table output and create a graphic display.
                // Java 1.5 has a known bug, #6328248, that prevents printing of progress
                //  bars using old style printing classes.  It results in blank bars on Windows,
                //  but hangs Macs. The version check is a workaround.
                float v = Float.parseFloat(System.getProperty("java.version").substring(0, 3));
                if (originalName.equals("Speed Table") && v < 1.5) {
                    // set the height of the speed table graph in lines
                    int speedFrameLineHeight = 11;
                    s = "\n";

                    // check that there is enough room on the page; if not,
                    // space down the rest of the page.
                    // don't use page break because we want the table borders to be written
                    // to the bottom of the page
                    int pageSize = w.getLinesPerPage();
                    int here = w.getCurrentLineNumber();
                    if (pageSize - here < speedFrameLineHeight) {
                        for (int j = 0; j < (pageSize - here); j++) {
                            w.writeBorders();
                            w.write(s, 0, s.length());
                        }
                    }

                    // Now that there is page space, create the window to hold the graphic speed table
                    JWindow speedWindow = new JWindow();
                    // Window size as wide as possible to allow for largest type size
                    speedWindow.setSize(512, 165);
                    speedWindow.getContentPane().setBackground(Color.white);
                    speedWindow.getContentPane().setLayout(null);
                    // in preparation for display, extract the speed table values into an array
                    StringTokenizer valueTokens = new StringTokenizer(originalValue, ",", false);
                    int[] speedVals = new int[28];
                    int k = 0;
                    while (valueTokens.hasMoreTokens()) {
                        speedVals[k] = Integer.parseInt(valueTokens.nextToken());
                        k++;
                    }

                    // Now create a set of vertical progress bar whose length is based
                    // on the speed table value (half height) and add them to the window
                    for (int j = 0; j < 28; j++) {
                        JProgressBar printerBar = new JProgressBar(JProgressBar.VERTICAL, 0, 127);
                        printerBar.setBounds(52 + j * 15, 19, 10, 127);
                        printerBar.setValue(speedVals[j] / 2);
                        printerBar.setBackground(Color.white);
                        printerBar.setForeground(Color.darkGray);
                        printerBar.setBorder(BorderFactory.createLineBorder(Color.black));
                        speedWindow.getContentPane().add(printerBar);
                        // create a set of value labels at the top containing the speed table values
                        JLabel barValLabel = new JLabel(Integer.toString(speedVals[j]), SwingConstants.CENTER);
                        barValLabel.setBounds(50 + j * 15, 4, 15, 15);
                        barValLabel.setFont(new Font("Monospaced", Font.PLAIN, 7));
                        speedWindow.getContentPane().add(barValLabel);
                        //Create a set of labels at the bottom with the CV numbers in them
                        JLabel barCvLabel = new JLabel(Integer.toString(67 + j), SwingConstants.CENTER);
                        barCvLabel.setBounds(50 + j * 15, 150, 15, 15);
                        barCvLabel.setFont(new Font("Monospaced", Font.PLAIN, 7));
                        speedWindow.getContentPane().add(barCvLabel);
                    }
                    JLabel cvLabel = new JLabel(Bundle.getMessage("Value"));
                    cvLabel.setFont(new Font("Monospaced", Font.PLAIN, 7));
                    cvLabel.setBounds(25, 4, 26, 15);
                    speedWindow.getContentPane().add(cvLabel);
                    JLabel valueLabel = new JLabel("CV"); // I18N seems undesirable for support
                    valueLabel.setFont(new Font("Monospaced", Font.PLAIN, 7));
                    valueLabel.setBounds(37, 150, 13, 15);
                    speedWindow.getContentPane().add(valueLabel);
                    // pass the complete window to the printing class
                    w.write(speedWindow);
                    // Now need to write the borders on sides of table
                    for (int j = 0; j < speedFrameLineHeight; j++) {
                        w.writeBorders();
                        w.write(s, 0, s.length());
                    }
                }
            }

            final int TABLE_COLS = 3;

            // index over CVs
            if (cvList.size() > 0) {
//            Check how many Cvs there are to print
                int cvCount = cvList.size();
                w.setFontStyle(Font.BOLD); //set font to Bold
                // print a simple heading with I18N
                s = String.format("%1$21s", Bundle.getMessage("Value")) + String.format("%1$28s", Bundle.getMessage("Value")) +
                        String.format("%1$28s", Bundle.getMessage("Value"));
                w.write(s, 0, s.length());
                w.writeBorders();
                s = "\n";
                w.write(s, 0, s.length());
                // NO I18N
                s = "            CV  Dec Hex                 CV  Dec Hex                 CV  Dec Hex";
                w.write(s, 0, s.length());
                w.writeBorders();
                s = "\n";
                w.write(s, 0, s.length());
                w.setFontStyle(0); //set font back to Normal
                //           }
                /*create an array to hold CV/Value strings to allow reformatting and sorting
                 Same size as the table drawn above (TABLE_COLS columns*tableHeight; heading rows
                 not included). Use the count of how many CVs there are to determine the number
                 of table rows required.  Add one more row if the divison into TABLE_COLS columns
                 isn't even.
                 */
                int tableHeight = cvCount / TABLE_COLS;
                if (cvCount % TABLE_COLS > 0) {
                    tableHeight++;
                }
                String[] cvStrings = new String[TABLE_COLS * tableHeight];

                //blank the array
                Arrays.fill(cvStrings, "");

                // get each CV and value
                int i = 0;
                for (int cvNum : cvList) {
                    CvValue cv = _cvModel.getCvByRow(cvNum);

                    int value = cv.getValue();

                    //convert and pad numbers as needed
                    String numString = String.format("%12s", cv.number());
                    StringBuilder valueString = new StringBuilder(Integer.toString(value));
                    String valueStringHex = Integer.toHexString(value).toUpperCase();
                    if (value < 16) {
                        valueStringHex = "0" + valueStringHex;
                    }
                    for (int j = 1; j < 3; j++) {
                        if (valueString.length() < 3) {
                            valueString.insert(0, " ");
                        }
                    }
                    //Create composite string of CV and its decimal and hex values
                    s = "  " + numString + "  " + valueString + "  " + valueStringHex
                            + " ";

                    //populate printing array - still treated as a single column
                    cvStrings[i] = s;
                    i++;
                }

                //sort the array in CV order (just the members with values)
                String temp;
                boolean swap;
                do {
                    swap = false;
                    for (i = 0; i < _cvModel.getRowCount() - 1; i++) {
                        if (PrintCvAction.cvSortOrderVal(cvStrings[i + 1].substring(0, 15).trim()) < PrintCvAction.cvSortOrderVal(cvStrings[i].substring(0, 15).trim())) {
                            temp = cvStrings[i + 1];
                            cvStrings[i + 1] = cvStrings[i];
                            cvStrings[i] = temp;
                            swap = true;
                        }
                    }
                } while (swap);

                //Print the array in four columns
                for (i = 0; i < tableHeight; i++) {
                    s = cvStrings[i] + "    " + cvStrings[i + tableHeight] + "    " + cvStrings[i
                            + tableHeight * 2];
                    w.write(s, 0, s.length());
                    w.writeBorders();
                    s = "\n";
                    w.write(s, 0, s.length());
                }
            }
            s = "\n";
            w.writeBorders();
            w.write(s, 0, s.length());
            w.writeBorders();
            w.write(s, 0, s.length());

            // handle special cases
        } catch (IOException e) {
            log.warn("error during printing", e);
        }

    }

    private JPanel addDccAddressPanel(Element e) {
        JPanel l = new DccAddressPanel(_varModel);
        panelList.add(l);
        // make sure this will get read/written, even if real vars not on pane
        int iVar;

        // note we want Short Address first, as it might change others
        iVar = _varModel.findVarIndex("Short Address");
        if (iVar >= 0) {
            varList.add(iVar);
        } else {
            log.debug("addDccAddressPanel did not find Short Address");
        }

        iVar = _varModel.findVarIndex("Address Format");
        if (iVar >= 0) {
            varList.add(iVar);
        } else {
            log.debug("addDccAddressPanel did not find Address Format");
        }

        iVar = _varModel.findVarIndex("Long Address");
        if (iVar >= 0) {
            varList.add(iVar);
        } else {
            log.debug("addDccAddressPanel did not find Long Address");
        }

        // included here because CV1 can modify it, even if it doesn't show on pane;
        iVar = _varModel.findVarIndex("Consist Address");
        if (iVar >= 0) {
            varList.add(iVar);
        } else {
            log.debug("addDccAddressPanel did not find CV19 Consist Address");
        }

        return l;
    }

    private final static Logger log = LoggerFactory.getLogger(PaneProgPane.class);

}