Class FooBase

java.lang.Object
  |
  +--java.awt.Component
        |
        +--java.awt.Container
              |
              +--java.awt.Window
                    |
                    +--java.awt.Frame
                          |
                          +--FooBase

public class FooBase

extends java.awt.Frame

implements java.lang.Runnable

Sample program using the net.sourceforge.foobase classes.

The interface provided by this class is intended to be used on a PDA style device. The main focus is on entering new games, but replaying games already stored in a chessbase database is also implemented.

Given the nature of the target device (low on resources and a slow CPU), it is obvious that this application is not a competitor for the "real" chessbase program ;-)

Another PDA related issue is the usage of a null layout for the main application window: using standard AWT layoutmanagers just did not work out (too much space waa wasted)

See Also:

Serialized Form

Inner Class Summary

protected class	FooBase.ButtonNope
protected class	FooBase.ButtonNoShow
protected class	FooBase.ButtonShowGame
protected class	FooBase.ButtonYup
protected class	FooBase.DeleteGame
protected class	FooBase.FooBaseCompListener
protected class	FooBase.GameInfo
protected class	FooBase.HideWindow
protected class	FooBase.ListGames
protected class	FooBase.Mickey
protected class	FooBase.NavigateGame
protected class	FooBase.NewGame
protected class	FooBase.NukeWindow
protected class	FooBase.OpenCreateDB
protected class	FooBase.SaveGame
protected class	FooBase.ScrollMoves
protected class	FooBase.ShowHelp
protected class	FooBase.StartAnimation

Field Summary

static java.lang.String	__version
protected java.lang.String	_annotator Annotator
protected DisplayBoard	_brd Board display component.
protected java.awt.Button	_btn_create Create new database option
protected java.awt.Button	_btn_delete Delete game button
protected java.awt.Button	_btn_down Scroll down move annotations button
protected java.awt.Button	_btn_endgame End of game button
protected java.awt.Button	_btn_help Help button
protected java.awt.Button	_btn_info Game info button
protected java.awt.Button	_btn_list List games button
protected java.awt.Button	_btn_newgame New game button
protected java.awt.Button	_btn_open Open database button
protected java.awt.Button	_btn_redo Redo next move button
protected java.awt.Button	_btn_save Save game button
protected java.awt.Button	_btn_scroll_back Scroll up in the text field.
protected java.awt.Button	_btn_scroll_further Scroll down in the text field.
protected java.awt.Button	_btn_start Back to start of game button
protected java.awt.Button	_btn_undo Undo last move button
protected java.awt.Button	_btn_up Scroll up move annotations button
protected int	_c0 Column number for originating piece
protected CBFDatabase	_dbase Current database.
protected int	_delay Delay between two automatic moves in milliseconds.
protected boolean	_doin_la_bamba Switch indicating if the animation thread is active.
protected java.lang.String	_elo_black ELO of black player
protected java.lang.String	_elo_white ELO of white player
protected Game	_game Game to build
protected int	_game_idx Index of game in case it was retrieved from a database.
protected java.awt.Dialog	_gamelist_panel List of all games in database panel
protected boolean	_going_up Switch for animation direction: true means scroll further in game, false means scroll back towards the start of the game.
protected java.awt.Dialog	_help_panel Help text panel (shown when help button is pressed)
protected java.awt.Dialog	_info_dialog Info dialog.
protected FooBase	_it_is_aai Reference to main application frame.
protected java.awt.List	_lst_headers List containing all game header strings
protected static int	_max_height Height to use.
protected static int	_max_width Width to use.
protected java.util.Vector	_moves Current move list.
protected java.lang.String	_name_black Name of black player
protected java.lang.String	_name_white Name of white player
protected java.awt.Button	_nope Cancel button in info dialog
protected java.awt.Image[]	_pieces Images to use for all the pieces.
protected int	_plynr Element number of "current" move in the game move list, that is: the element where the next move will be stored in _them_moves
protected MoveAnnotations	_pnl_moves Panel inside the scrollpane
protected java.awt.ScrollPane	_pnl_scroll Scroll pane used for holding move annotations.
protected int	_r0 Row number for originating piece
protected java.lang.String	_result Game result
protected java.lang.Thread	_runner Animation thread
protected Board	_setup Current board setup
protected java.awt.Button[][]	_them_buttons Array used for sizing and positioning of the buttons.
protected java.util.Vector	_them_moves Vector containing the moves so far.
protected int	_tomove Code for current player to move: 0 means white, 1 means black
protected java.lang.String	_tournament Tournament
protected java.awt.TextField	_txt_annotator Textfield for entering annotator
protected java.awt.TextField	_txt_elo_black Textfield for entering ELO of black player
protected java.awt.TextField	_txt_elo_white Textfield for entering ELO of white player
protected java.awt.TextField	_txt_move_annotation1 First text line containing the game moves
protected java.awt.TextField	_txt_move_annotation2 Second text line containing the game moves
protected java.awt.TextField	_txt_name_black Textfield for entering name of black player
protected java.awt.TextField	_txt_name_white Textfield for entering name of white player
protected java.awt.TextField	_txt_result Textfield for entering game result.
protected java.awt.TextField	_txt_tournament Textfield for entering tournament info.
protected java.awt.TextField	_txt_year Textfield for entering year that game was played.
protected java.lang.String	_year Year
protected java.awt.Button	_yup Ok button in info dialog
protected static java.lang.String	CMD_BACK Action command string for "autoplay backwards" button
protected static java.lang.String	CMD_DELETE Action command string for "delete" menu item
protected static java.lang.String	CMD_DOWN Action command string for "scroll down moves" button
protected static java.lang.String	CMD_ENDGAME Action command string for "end of game" button
protected static java.lang.String	CMD_FURTHER Action command string for "autoplay forward" button
protected static java.lang.String	CMD_HELP Action command string for "help" button
protected static java.lang.String	CMD_INFO Action command string for "game info" menu item
protected static java.lang.String	CMD_LIST Action command string for "list games" menu item
protected static java.lang.String	CMD_NEWDB Action command string for "create database" menu item
protected static java.lang.String	CMD_NEWGAME Action command string for "new game" menu item
protected static java.lang.String	CMD_NOPE Action command string for "cancel" button
protected static java.lang.String	CMD_OPENDB Action command string for "open database" menu item
protected static java.lang.String	CMD_REDO Action command string for "redo move" button
protected static java.lang.String	CMD_SAVE Action command string for "save" menu item
protected static java.lang.String	CMD_STARTGAME Action command string for "start of game" button
protected static java.lang.String	CMD_UNDO Action command string for "undo move" button
protected static java.lang.String	CMD_UP Action command string for "scroll up moves" button
protected static java.lang.String	CMD_YUP Action command string for "Ok" button

Fields inherited from class java.awt.Frame

CROSSHAIR_CURSOR, DEFAULT_CURSOR, E_RESIZE_CURSOR, HAND_CURSOR, ICONIFIED, MOVE_CURSOR, N_RESIZE_CURSOR, NE_RESIZE_CURSOR, NORMAL, NW_RESIZE_CURSOR, S_RESIZE_CURSOR, SE_RESIZE_CURSOR, SW_RESIZE_CURSOR, TEXT_CURSOR, W_RESIZE_CURSOR, WAIT_CURSOR

Fields inherited from class java.awt.Component

BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT

Constructor Summary

FooBase()
Default public constructor.

Method Summary

protected void	addBagCentered(java.awt.Component c, int x, int y, java.awt.GridBagLayout gb, java.awt.Container cnt) Add a horizontally stretched out component to gridbaglayout.
protected void	addBagFilled(java.awt.Component c, int x, int y, java.awt.GridBagLayout gb, java.awt.Container cnt) Add a horizontally stretched out component to gridbaglayout.
protected void	addBagFilled(java.awt.Component c, int x, int y, int w, java.awt.GridBagLayout gb, java.awt.Container cnt) Add a horizontally stretched out component to gridbaglayout.
protected void	addBagFilled(java.awt.Component c, int x, int y, int w, int h, java.awt.GridBagLayout gb, java.awt.Container cnt) Add a horizontally stretched out component to gridbaglayout.
protected void	addBagLeft(java.awt.Component c, int x, int y, java.awt.GridBagLayout gb, java.awt.Container cnt) Add a left-justified component to gridbaglayout.
protected void	addOptionButtons() Add move annotations and option buttons panel.
protected void	bailout() Terminate program.
protected void	clearInput() Clear all text fields in info dialog, as well as their String counterparts.
protected void	createInfoDialog() Create dialog for entering players info etc.
void	doLayout() Do layouting for this container.
protected void	doTheLayouting() Compute sizes and locations of all components in this frame.
protected void	getInfoFields() Extract data from dialog fields
java.awt.Insets	getInsets() Return insets to use for frame.
java.awt.Insets	insets() Return insets to use for frame.
static void	main(java.lang.String[] args) Main entry point for standalone java application.
protected void	maximize(java.awt.Component c) Maximize the size of a given component.
protected void	maximizeMostly(java.awt.Component c) Resize component to about 70% of the full size.
protected java.awt.Button	newButton(java.lang.String l, java.lang.String cmd, int x, int y, java.awt.event.ActionListener lstnr) Create and add a new button to the bottom "panel" of the application window.
void	run() Actual code running in the animation thread.
protected void	scrollBack() Retract last move
protected void	scrollFurther() Redo next move
protected void	setInfoFields() Update fields in info dialog fields with data obtained from the database.
void	start() Start animation thread if it is not yet started.
protected void	startNewGame() Start new game.
void	update(java.awt.Graphics g) Update the component.
protected void	updateProps() Update various properties based on new values for _plynr and _setup

Methods inherited from class java.awt.Frame

addNotify, finalize, getCursorType, getFrames, getIconImage, getMenuBar, getState, getTitle, isResizable, paramString, remove, removeNotify, setCursor, setIconImage, setMenuBar, setResizable, setState, setTitle

Methods inherited from class java.awt.Window

addWindowListener, applyResourceBundle, applyResourceBundle, dispose, getFocusOwner, getInputContext, getLocale, getOwnedWindows, getOwner, getToolkit, getWarningString, hide, isShowing, pack, postEvent, processEvent, processWindowEvent, removeWindowListener, setCursor, show, toBack, toFront

Methods inherited from class java.awt.Container

add, add, add, add, add, addContainerListener, addImpl, countComponents, deliverEvent, findComponentAt, findComponentAt, getAlignmentX, getAlignmentY, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents, getLayout, getMaximumSize, getMinimumSize, getPreferredSize, invalidate, isAncestorOf, layout, list, list, locate, minimumSize, paint, paintComponents, preferredSize, print, printComponents, processContainerEvent, remove, remove, removeAll, removeContainerListener, setFont, setLayout, validate, validateTree

Methods inherited from class java.awt.Component

action, add, addComponentListener, addFocusListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addPropertyChangeListener, addPropertyChangeListener, bounds, checkImage, checkImage, coalesceEvents, contains, contains, createImage, createImage, disable, disableEvents, dispatchEvent, enable, enable, enableEvents, enableInputMethods, firePropertyChange, getBackground, getBounds, getBounds, getColorModel, getComponentOrientation, getCursor, getDropTarget, getFont, getFontMetrics, getForeground, getGraphics, getHeight, getInputMethodRequests, getLocation, getLocation, getLocationOnScreen, getName, getParent, getPeer, getSize, getSize, getTreeLock, getWidth, getX, getY, gotFocus, handleEvent, hasFocus, imageUpdate, inside, isDisplayable, isDoubleBuffered, isEnabled, isFocusTraversable, isLightweight, isOpaque, isValid, isVisible, keyDown, keyUp, list, list, list, location, lostFocus, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paintAll, prepareImage, prepareImage, printAll, processComponentEvent, processFocusEvent, processInputMethodEvent, processKeyEvent, processMouseEvent, processMouseMotionEvent, removeComponentListener, removeFocusListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, repaint, requestFocus, reshape, resize, resize, setBackground, setBounds, setBounds, setComponentOrientation, setDropTarget, setEnabled, setForeground, setLocale, setLocation, setLocation, setName, setSize, setSize, setVisible, show, size, toString, transferFocus

Methods inherited from class java.lang.Object

clone, equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

CMD_OPENDB

protected static final java.lang.String CMD_OPENDB

Action command string for "open database" menu item

CMD_NEWDB

protected static final java.lang.String CMD_NEWDB

Action command string for "create database" menu item

CMD_NEWGAME

protected static final java.lang.String CMD_NEWGAME

Action command string for "new game" menu item

CMD_SAVE

protected static final java.lang.String CMD_SAVE

Action command string for "save" menu item

CMD_DELETE

protected static final java.lang.String CMD_DELETE

Action command string for "delete" menu item

CMD_LIST

protected static final java.lang.String CMD_LIST

Action command string for "list games" menu item

CMD_INFO

protected static final java.lang.String CMD_INFO

Action command string for "game info" menu item

CMD_YUP

protected static final java.lang.String CMD_YUP

Action command string for "Ok" button

CMD_NOPE

protected static final java.lang.String CMD_NOPE

Action command string for "cancel" button

CMD_STARTGAME

protected static final java.lang.String CMD_STARTGAME

Action command string for "start of game" button

CMD_ENDGAME

protected static final java.lang.String CMD_ENDGAME

Action command string for "end of game" button

CMD_UNDO

protected static final java.lang.String CMD_UNDO

Action command string for "undo move" button

CMD_REDO

protected static final java.lang.String CMD_REDO

Action command string for "redo move" button

CMD_HELP

protected static final java.lang.String CMD_HELP

Action command string for "help" button

CMD_BACK

protected static final java.lang.String CMD_BACK

Action command string for "autoplay backwards" button

CMD_FURTHER

protected static final java.lang.String CMD_FURTHER

Action command string for "autoplay forward" button

CMD_UP

protected static final java.lang.String CMD_UP

Action command string for "scroll up moves" button

CMD_DOWN

protected static final java.lang.String CMD_DOWN

Action command string for "scroll down moves" button

_max_width

protected static int _max_width

Width to use.

_max_height

protected static int _max_height

Height to use.

_dbase

protected CBFDatabase _dbase

Current database.

_brd

protected DisplayBoard _brd

Board display component.

_pieces

protected java.awt.Image[] _pieces

Images to use for all the pieces.

_game

protected Game _game

Game to build

_game_idx

protected int _game_idx

Index of game in case it was retrieved from a database.

For new games, this value is -1, for others it is greater than or equal zero.

Note that this scheme works for chessbase databases because we those games are identified by a numerical ID.

_setup

protected Board _setup

Current board setup

_moves

protected java.util.Vector _moves

Current move list.

_r0

protected int _r0

Row number for originating piece

_c0

protected int _c0

Column number for originating piece

_tomove

protected int _tomove

Code for current player to move: 0 means white, 1 means black

_btn_open

protected java.awt.Button _btn_open

Open database button

_btn_create

protected java.awt.Button _btn_create

Create new database option

Does not seem to work on PDA: ignore for now.

_btn_newgame

protected java.awt.Button _btn_newgame

New game button

_btn_info

protected java.awt.Button _btn_info

Game info button

_btn_save

protected java.awt.Button _btn_save

Save game button

_btn_delete

protected java.awt.Button _btn_delete

Delete game button

_btn_list

protected java.awt.Button _btn_list

List games button

_btn_start

protected java.awt.Button _btn_start

Back to start of game button

_btn_undo

protected java.awt.Button _btn_undo

Undo last move button

_btn_redo

protected java.awt.Button _btn_redo

Redo next move button

_btn_endgame

protected java.awt.Button _btn_endgame

End of game button

_btn_help

protected java.awt.Button _btn_help

Help button

_btn_up

protected java.awt.Button _btn_up

Scroll up move annotations button

_btn_down

protected java.awt.Button _btn_down

Scroll down move annotations button

_them_buttons

protected java.awt.Button[][] _them_buttons

Array used for sizing and positioning of the buttons.

_pnl_scroll

protected java.awt.ScrollPane _pnl_scroll

Scroll pane used for holding move annotations.

_pnl_moves

protected MoveAnnotations _pnl_moves

Panel inside the scrollpane

_it_is_aai

protected FooBase _it_is_aai

Reference to main application frame.

_info_dialog

protected java.awt.Dialog _info_dialog

Info dialog.

_txt_name_white

protected java.awt.TextField _txt_name_white

Textfield for entering name of white player

_txt_elo_white

protected java.awt.TextField _txt_elo_white

Textfield for entering ELO of white player

_txt_name_black

protected java.awt.TextField _txt_name_black

Textfield for entering name of black player

_txt_elo_black

protected java.awt.TextField _txt_elo_black

Textfield for entering ELO of black player

_txt_tournament

protected java.awt.TextField _txt_tournament

Textfield for entering tournament info.

_txt_year

protected java.awt.TextField _txt_year

Textfield for entering year that game was played.

_txt_annotator

protected java.awt.TextField _txt_annotator

Textfield for entering annotator

_txt_result

protected java.awt.TextField _txt_result

Textfield for entering game result.

_lst_headers

protected java.awt.List _lst_headers

List containing all game header strings

_yup

protected java.awt.Button _yup

Ok button in info dialog

_nope

protected java.awt.Button _nope

Cancel button in info dialog

_help_panel

protected java.awt.Dialog _help_panel

Help text panel (shown when help button is pressed)

_gamelist_panel

protected java.awt.Dialog _gamelist_panel

List of all games in database panel

_txt_move_annotation1

protected java.awt.TextField _txt_move_annotation1

First text line containing the game moves

_txt_move_annotation2

protected java.awt.TextField _txt_move_annotation2

Second text line containing the game moves

_btn_scroll_back

protected java.awt.Button _btn_scroll_back

Scroll up in the text field.

_btn_scroll_further

protected java.awt.Button _btn_scroll_further

Scroll down in the text field.

_name_white

protected java.lang.String _name_white

Name of white player

_elo_white

protected java.lang.String _elo_white

ELO of white player

_name_black

protected java.lang.String _name_black

Name of black player

_elo_black

protected java.lang.String _elo_black

ELO of black player

_tournament

protected java.lang.String _tournament

Tournament

_year

protected java.lang.String _year

Year

_annotator

protected java.lang.String _annotator

Annotator

_result

protected java.lang.String _result

Game result

_plynr

protected int _plynr

Element number of "current" move in the game move list, that is: the element where the next move will be stored in _them_moves

_them_moves

protected java.util.Vector _them_moves

Vector containing the moves so far.

_runner

protected java.lang.Thread _runner

Animation thread

_going_up

protected boolean _going_up

Switch for animation direction: true means scroll further in game, false means scroll back towards the start of the game.

_doin_la_bamba

protected boolean _doin_la_bamba

Switch indicating if the animation thread is active.

If this switch is set to false, the thread will stop.

_delay

protected int _delay

Delay between two automatic moves in milliseconds.

__version

public static final java.lang.String __version

Constructor Detail

FooBase

public FooBase()

Default public constructor.

Method Detail

main

public static void main(java.lang.String[] args)

Main entry point for standalone java application.

Parameters:

args - String[] containing the commandline paranmeters

insets

public java.awt.Insets insets()

Return insets to use for frame.

Overrides:

insets in class java.awt.Container

Returns:

Insets describing how much space to leave between different components in this frame.

getInsets

public java.awt.Insets getInsets()

Return insets to use for frame.

All insets, except for the top, are set to zero.

Overrides:

getInsets in class java.awt.Container

Returns:

Insets describing how much space to leave between different components in this frame.

doLayout

public void doLayout()

Do layouting for this container.

This method dynamically sizes the chessboard component to full width and 75/110 of the available height. That ratio is handpicked to offer a "reasonable" area in which the buttons and move annotations can be stuffed when working on a 240 by 320 PDA screen.

Overrides:

doLayout in class java.awt.Container

update

public void update(java.awt.Graphics g)

Update the component.

The main reason for implementing this method is to avoid clearing of the component on screen first (and thus reducing possible flikkering on the screen)

Overrides:

update in class java.awt.Container

Parameters:

g - Graphics to draw the board on.

start

public void start()

Start animation thread if it is not yet started.

run

public void run()

Actual code running in the animation thread.

Specified by:

run in interface java.lang.Runnable

doTheLayouting

protected void doTheLayouting()

Compute sizes and locations of all components in this frame.

THe ratio for chessboard/bottom stuff is 75/110 for the chessboard and 35/110 for the bottom part. The only reason for this ratio is that it offers enough space on a 240x320 PDA screen to draw the bottom components with a reasonable size.

About the only difference with a full doLayout() is that no call to the super class implementation of doLayout() is done.

addOptionButtons

protected void addOptionButtons()

Add move annotations and option buttons panel.

The buttons are drawn in a grid of 3 rows by 11 columns. The area (1,0) to (10,1) is occupied by the area in which the moves are printed.

newButton

protected java.awt.Button newButton(java.lang.String l,
                                    java.lang.String cmd,
                                    int x,
                                    int y,
                                    java.awt.event.ActionListener lstnr)

Create and add a new button to the bottom "panel" of the application window.

Parameters:

l - String containing the button label

cmd - String containing the action command for the button

x - int X-coordinate in the grid where the button is to be located

y - int Y-coordinate in the grid where the button is to be located

lstnr - ActionListener to add for handling button clicks

Returns:

Button created and located according to the specs

startNewGame

protected void startNewGame()

Start new game.

bailout

protected void bailout()

Terminate program.

createInfoDialog

protected void createInfoDialog()

Create dialog for entering players info etc.

clearInput

protected void clearInput()

Clear all text fields in info dialog, as well as their String counterparts.

getInfoFields

protected void getInfoFields()

Extract data from dialog fields

setInfoFields

protected void setInfoFields()

Update fields in info dialog fields with data obtained from the database.

maximize

protected void maximize(java.awt.Component c)

Maximize the size of a given component.

Parameters:

c - Component to resize to the size of the screen

maximizeMostly

protected void maximizeMostly(java.awt.Component c)

Resize component to about 70% of the full size.

The main reason for this method is to offer panels with sufficient space near the bottom for a virtual keyboard on a PDA.

Parameters:

c - Component to resize to the size of the screen

addBagLeft

protected void addBagLeft(java.awt.Component c,
                          int x,
                          int y,
                          java.awt.GridBagLayout gb,
                          java.awt.Container cnt)

Add a left-justified component to gridbaglayout.

Parameters:

c - Component to add to the gridbaglayout

x - int x-coordinate in gridbag grid

y - int y-coordinate in gridbag grid

gb - GridBagLayout to add the component to.

cnt - Container to which the component is to be added

addBagFilled

protected void addBagFilled(java.awt.Component c,
                            int x,
                            int y,
                            java.awt.GridBagLayout gb,
                            java.awt.Container cnt)

Add a horizontally stretched out component to gridbaglayout.

Parameters:

c - Component to add to the gridbaglayout

x - int x-coordinate in gridbag grid

y - int y-coordinate in gridbag grid

gb - GridBagLayout to add the component to.

cnt - Container to which the component is to be added

addBagFilled

protected void addBagFilled(java.awt.Component c,
                            int x,
                            int y,
                            int w,
                            java.awt.GridBagLayout gb,
                            java.awt.Container cnt)

Add a horizontally stretched out component to gridbaglayout.

Parameters:

c - Component to add to the gridbaglayout

x - int x-coordinate in gridbag grid

y - int y-coordinate in gridbag grid

w - int with in gridbag cells

gb - GridBagLayout to add the component to.

cnt - Container to which the component is to be added

addBagFilled

protected void addBagFilled(java.awt.Component c,
                            int x,
                            int y,
                            int w,
                            int h,
                            java.awt.GridBagLayout gb,
                            java.awt.Container cnt)

Add a horizontally stretched out component to gridbaglayout.

Parameters:

c - Component to add to the gridbaglayout

x - int x-coordinate in gridbag grid

y - int y-coordinate in gridbag grid

w - int with in gridbag cells

h - int height in gridbag cells

gb - GridBagLayout to add the component to.

cnt - Container to which the component is to be added

addBagCentered

protected void addBagCentered(java.awt.Component c,
                              int x,
                              int y,
                              java.awt.GridBagLayout gb,
                              java.awt.Container cnt)

Add a horizontally stretched out component to gridbaglayout.

Parameters:

c - Component to add to the gridbaglayout

x - int x-coordinate in gridbag grid

y - int y-coordinate in gridbag grid

gb - GridBagLayout to add the component to.

cnt - Container to which the component is to be added

updateProps

protected void updateProps()

Update various properties based on new values for _plynr and _setup

This method is called when a new move is entered or when one of the navigation buttons is clicked.

scrollBack

protected void scrollBack()

Retract last move

scrollFurther

protected void scrollFurther()

Redo next move