/*
* Copyright (c) 2003 Sun Microsystems, Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* -Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* -Redistribution in binary form must reproduct the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the distribution.
*
* Neither the name of Sun Microsystems, Inc. or the names of contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING
* ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
* OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT
* BE LIABLE FOR ANY DAMAGES OR LIABILITIES SUFFERED BY LICENSEE AS A RESULT
* OF OR RELATING TO USE, MODIFICATION OR DISTRIBUTION OF THE SOFTWARE OR ITS
* DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST
* REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL,
* INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY
* OF LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE SOFTWARE, EVEN
* IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
*
* You acknowledge that Software is not designed, licensed or intended for
* use in the design, construction, operation or maintenance of any nuclear
* facility.
*/
/*
* @(#)SpreadSheet.java 1.12 03/01/23
*/
import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.lang.*;
import java.net.*;
public class SpreadSheet
extends Applet
implements MouseListener, KeyListener {
String title;
Font titleFont;
Color cellColor;
Color inputColor;
int cellWidth = 100;
int cellHeight = 15;
int titleHeight = 15;
int rowLabelWidth = 15;
Font inputFont;
boolean isStopped = false;
boolean fullUpdate = true;
int rows;
int columns;
int currentKey = -1;
int selectedRow = -1;
int selectedColumn = -1;
SpreadSheetInput inputArea;
Cell cells[][];
Cell current = null;
public synchronized void init() {
String rs;
cellColor = Color.white;
inputColor = new Color(100, 100, 225);
inputFont = new Font("Monospaced", Font.PLAIN, 10);
titleFont = new Font("Monospaced", Font.BOLD, 12);
title = getParameter("title");
if (title == null) {
title = "Spreadsheet";
}
rs = getParameter("rows");
if (rs == null) {
rows = 9;
} else {
rows = Integer.parseInt(rs);
}
rs = getParameter("columns");
if (rs == null) {
columns = 5;
} else {
columns = Integer.parseInt(rs);
}
cells = new Cell[rows][columns];
char l[] = new char[1];
for (int i=0; i < rows; i++) {
for (int j=0; j < columns; j++) {
cells[i][j] = new Cell(this,
Color.lightGray,
Color.black,
cellColor,
cellWidth - 2,
cellHeight - 2);
l[0] = (char)((int)'a' + j);
rs = getParameter("" + new String(l) + (i+1));
if (rs != null) {
cells[i][j].setUnparsedValue(rs);
}
}
}
Dimension d = getSize();
inputArea = new SpreadSheetInput(null, this, d.width - 2, cellHeight - 1,
inputColor, Color.white);
resize(columns * cellWidth + rowLabelWidth,
(rows + 3) * cellHeight + titleHeight);
addMouseListener(this);
addKeyListener(this);
}
public void setCurrentValue(float val) {
if (selectedRow == -1 || selectedColumn == -1) {
return;
}
cells[selectedRow][selectedColumn].setValue(val);
repaint();
}
public void stop() {
isStopped = true;
}
public void start() {
isStopped = false;
}
public void destroy() {
for (int i=0; i < rows; i++) {
for (int j=0; j < columns; j++) {
if (cells[i][j].type == Cell.URL) {
cells[i][j].updaterThread.stop();
}
}
}
}
public void setCurrentValue(int type, String val) {
if (selectedRow == -1 || selectedColumn == -1) {
return;
}
cells[selectedRow][selectedColumn].setValue(type, val);
repaint();
}
public void update(Graphics g) {
if (! fullUpdate) {
int cx, cy;
g.setFont(titleFont);
for (int i=0; i < rows; i++) {
for (int j=0; j < columns; j++) {
if (cells[i][j].needRedisplay) {
cx = (j * cellWidth) + 2 + rowLabelWidth;
cy = ((i+1) * cellHeight) + 2 + titleHeight;
cells[i][j].paint(g, cx, cy);
}
}
}
} else {
paint(g);
fullUpdate = false;
}
}
public void recalculate() {
int i,j;
//System.out.println("SpreadSheet.recalculate");
for (i=0; i < rows; i++) {
for (j=0; j < columns; j++) {
if (cells[i][j] != null && cells[i][j].type == Cell.FORMULA) {
cells[i][j].setRawValue(evaluateFormula(cells[i][j].parseRoot));
cells[i][j].needRedisplay = true;
}
}
}
repaint();
}
public float evaluateFormula(Node n) {
float val = 0.0f;
//System.out.println("evaluateFormula:");
//n.print(3);
if (n == null) {
//System.out.println("Null node");
return val;
}
switch (n.type) {
case Node.OP:
val = evaluateFormula(n.left);
switch (n.op) {
case '+':
val += evaluateFormula(n.right);
break;
case '*':
val *= evaluateFormula(n.right);
break;
case '-':
val -= evaluateFormula(n.right);
break;
case '/':
val /= evaluateFormula(n.right);
break;
}
break;
case Node.VALUE:
//System.out.println("=>" + n.value);
return n.value;
case Node.CELL:
if (n == null) {
//System.out.println("NULL at 192");
} else {
if (cells[n.row][n.column] == null) {
//System.out.println("NULL at 193");
} else {
//System.out.println("=>" + cells[n.row][n.column].value);
return cells[n.row][n.column].value;
}
}
}
//System.out.println("=>" + val);
return val;
}
public synchronized void paint(Graphics g) {
int i, j;
int cx, cy;
char l[] = new char[1];
Dimension d = getSize();
g.setFont(titleFont);
i = g.getFontMetrics().stringWidth(title);
g.drawString((title == null) ? "Spreadsheet" : title,
(d.width - i) / 2, 12);
g.setColor(inputColor);
g.fillRect(0, cellHeight, d.width, cellHeight);
g.setFont(titleFont);
for (i=0; i < rows+1; i++) {
cy = (i+2) * cellHeight;
g.setColor(getBackground());
g.draw3DRect(0, cy, d.width, 2, true);
if (i < rows) {
g.setColor(Color.red);
g.drawString("" + (i+1), 2, cy + 12);
}
}
g.setColor(Color.red);
cy = (rows+3) * cellHeight + (cellHeight / 2);
for (i=0; i < columns; i++) {
cx = i * cellWidth;
g.setColor(getBackground());
g.draw3DRect(cx + rowLabelWidth,
2 * cellHeight, 1, d.height, true);
if (i < columns) {
g.setColor(Color.red);
l[0] = (char)((int)'A' + i);
g.drawString(new String(l),
cx + rowLabelWidth + (cellWidth / 2),
cy);
}
}
for (i=0; i < rows; i++) {
for (j=0; j < columns; j++) {
cx = (j * cellWidth) + 2 + rowLabelWidth;
cy = ((i+1) * cellHeight) + 2 + titleHeight;
if (cells[i][j] != null) {
cells[i][j].paint(g, cx, cy);
}
}
}
g.setColor(getBackground());
g.draw3DRect(0, titleHeight,
d.width,
d.height - titleHeight,
false);
inputArea.paint(g, 1, titleHeight + 1);
}
//1.1 event handling
public void mouseClicked(MouseEvent e)
{}
public void mousePressed(MouseEvent e)
{
int x = e.getX();
int y = e.getY();
Cell cell;
if (y < (titleHeight + cellHeight)) {
selectedRow = -1;
if (y <= titleHeight && current != null) {
current.deselect();
current = null;
}
e.consume();
}
if (x < rowLabelWidth) {
selectedRow = -1;
if (current != null) {
current.deselect();
current = null;
}
e.consume();
}
selectedRow = ((y - cellHeight - titleHeight) / cellHeight);
selectedColumn = (x - rowLabelWidth) / cellWidth;
if (selectedRow > rows ||
selectedColumn >= columns) {
selectedRow = -1;
if (current != null) {
current.deselect();
current = null;
}
} else {
if (selectedRow >= rows) {
selectedRow = -1;
if (current != null) {
current.deselect();
current = null;
}
e.consume();
}
if (selectedRow != -1) {
cell = cells[selectedRow][selectedColumn];
inputArea.setText(new String(cell.getPrintString()));
if (current != null) {
current.deselect();
}
current = cell;
current.select();
requestFocus();
fullUpdate = true;
repaint();
}
e.consume();
}
}
public void mouseReleased(MouseEvent e)
{}
public void mouseEntered(MouseEvent e)
{}
public void mouseExited(MouseEvent e)
{}
public void keyPressed(KeyEvent e)
{
}
public void keyTyped(KeyEvent e) {
fullUpdate=true;
inputArea.processKey(e);
e.consume();
}
public void keyReleased(KeyEvent e)
{}
public String getAppletInfo() {
return "Title: SpreadSheet \nAuthor: Sami Shaio \nA simple spread sheet.";
}
public String[][] getParameterInfo() {
String[][] info = {
{"title", "string", "The title of the spread sheet. Default is 'Spreadsheet'"},
{"rows", "int", "The number of rows. Default is 9."},
{"columns", "int", "The number of columns. Default is 5."}
};
return info;
}
}
class CellUpdater extends Thread {
Cell target;
InputStream dataStream = null;
StreamTokenizer tokenStream;
public CellUpdater(Cell c) {
super("cell updater");
target = c;
}
public void run() {
try {
dataStream = new URL(target.app.getDocumentBase(),
target.getValueString()).openStream();
tokenStream = new StreamTokenizer(new BufferedReader(new InputStreamReader(dataStream)));
tokenStream.eolIsSignificant(false);
while (true) {
switch (tokenStream.nextToken()) {
case StreamTokenizer.TT_EOF:
dataStream.close();
return;
default:
break;
case StreamTokenizer.TT_NUMBER:
target.setTransientValue((float)tokenStream.nval);
if (! target.app.isStopped && ! target.paused) {
target.app.repaint();
}
break;
}
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
break;
}
}
} catch (IOException e) {
return;
}
}
}
class Cell {
public static final int VALUE = 0;
public static final int LABEL = 1;
public static final int URL = 2;
public static final int FORMULA = 3;
Node parseRoot;
boolean needRedisplay;
boolean selected = false;
boolean transientValue = false;
public int type = Cell.VALUE;
String valueString = "";
String printString = "v";
float value;
Color bgColor;
Color fgColor;
Color highlightColor;
int width;
int height;
SpreadSheet app;
CellUpdater updaterThread;
boolean paused = false;
public Cell(SpreadSheet app,
Color bgColor,
Color fgColor,
Color highlightColor,
int width,
int height) {
this.app = app;
this.bgColor = bgColor;
this.fgColor = fgColor;
this.highlightColor = highlightColor;
this.width = width;
this.height = height;
needRedisplay = true;
}
public void setRawValue(float f) {
valueString = Float.toString(f);
value = f;
}
public void setValue(float f) {
setRawValue(f);
printString = "v" + valueString;
type = Cell.VALUE;
paused = false;
app.recalculate();
needRedisplay = true;
}
public void setTransientValue(float f) {
transientValue = true;
value = f;
needRedisplay = true;
app.recalculate();
}
public void setUnparsedValue(String s) {
switch (s.charAt(0)) {
case 'v':
setValue(Cell.VALUE, s.substring(1));
break;
case 'f':
setValue(Cell.FORMULA, s.substring(1));
break;
case 'l':
setValue(Cell.LABEL, s.substring(1));
break;
case 'u':
setValue(Cell.URL, s.substring(1));
break;
}
}
/**
* Parse a spreadsheet formula. The syntax is defined as:
*
* formula -> value
* formula -> value op value
* value -> '(' formula ')'
* value -> cell
* value -> <number>
* op -> '+' | '*' | '/' | '-'
* cell -> <letter><number>
*/
public String parseFormula(String formula, Node node) {
String subformula;
String restFormula;
float value;
int length = formula.length();
Node left;
Node right;
char op;
if (formula == null) {
return null;
}
subformula = parseValue(formula, node);
//System.out.println("subformula = " + subformula);
if (subformula == null || subformula.length() == 0) {
//System.out.println("Parse succeeded");
return null;
}
if (subformula == formula) {
//System.out.println("Parse failed");
return formula;
}
// parse an operator and then another value
switch (op = subformula.charAt(0)) {
case 0:
//System.out.println("Parse succeeded");
return null;
case ')':
//System.out.println("Returning subformula=" + subformula);
return subformula;
case '+':
case '*':
case '-':
case '/':
restFormula = subformula.substring(1);
subformula = parseValue(restFormula, right=new Node());
//System.out.println("subformula(2) = " + subformula);
if (subformula != restFormula) {
//System.out.println("Parse succeeded");
left = new Node(node);
node.left = left;
node.right = right;
node.op = op;
node.type = Node.OP;
//node.print(3);
return subformula;
} else {
//System.out.println("Parse failed");
return formula;
}
default:
//System.out.println("Parse failed (bad operator): " + subformula);
return formula;
}
}
public String parseValue(String formula, Node node) {
char c = formula.charAt(0);
String subformula;
String restFormula;
float value;
int row;
int column;
//System.out.println("parseValue: " + formula);
restFormula = formula;
if (c == '(') {
//System.out.println("parseValue(" + formula + ")");
restFormula = formula.substring(1);
subformula = parseFormula(restFormula, node);
//System.out.println("rest=(" + subformula + ")");
if (subformula == null ||
subformula.length() == restFormula.length()) {
//System.out.println("Failed");
return formula;
} else if (! (subformula.charAt(0) == ')')) {
//System.out.println("Failed (missing parentheses)");
return formula;
}
restFormula = subformula;
} else if (c >= '0' && c <= '9') {
int i;
//System.out.println("formula=" + formula);
for (i=0; i < formula.length(); i++) {
c = formula.charAt(i);
if ((c < '0' || c > '9') && c != '.') {
break;
}
}
try {
value = Float.valueOf(formula.substring(0, i)).floatValue();
} catch (NumberFormatException e) {
//System.out.println("Failed (number format error)");
return formula;
}
node.type = Node.VALUE;
node.value = value;
//node.print(3);
restFormula = formula.substring(i);
//System.out.println("value= " + value + " i=" + i +
// " rest = " + restFormula);
return restFormula;
} else if (c >= 'A' && c <= 'Z') {
int i;
column = c - 'A';
restFormula = formula.substring(1);
for (i=0; i < restFormula.length(); i++) {
c = restFormula.charAt(i);
if (c < '0' || c > '9') {
break;
}
}
row = Float.valueOf(restFormula.substring(0, i)).intValue();
//System.out.println("row = " + row + " column = " + column);
node.row = row - 1;
node.column = column;
node.type = Node.CELL;
//node.print(3);
if (i == restFormula.length()) {
restFormula = null;
} else {
restFormula = restFormula.substring(i);
if (restFormula.charAt(0) == 0) {
return null;
}
}
}
return restFormula;
}
public void setValue(int type, String s) {
paused = false;
if (this.type == Cell.URL) {
updaterThread.stop();
updaterThread = null;
}
valueString = new String(s);
this.type = type;
needRedisplay = true;
switch (type) {
case Cell.VALUE:
setValue(Float.valueOf(s).floatValue());
break;
case Cell.LABEL:
printString = "l" + valueString;
break;
case Cell.URL:
printString = "u" + valueString;
updaterThread = new CellUpdater(this);
updaterThread.start();
break;
case Cell.FORMULA:
parseFormula(valueString, parseRoot = new Node());
printString = "f" + valueString;
break;
}
app.recalculate();
}
public String getValueString() {
return valueString;
}
public String getPrintString() {
return printString;
}
public void select() {
selected = true;
paused = true;
}
public void deselect() {
selected = false;
paused = false;
needRedisplay = true;
app.repaint();
}
public void paint(Graphics g, int x, int y) {
if (selected) {
g.setColor(highlightColor);
} else {
g.setColor(bgColor);
}
g.fillRect(x, y, width - 1, height);
if (valueString != null) {
switch (type) {
case Cell.VALUE:
case Cell.LABEL:
g.setColor(fgColor);
break;
case Cell.FORMULA:
g.setColor(Color.red);
break;
case Cell.URL:
g.setColor(Color.blue);
break;
}
if (transientValue){
g.drawString("" + value, x, y + (height / 2) + 5);
} else {
if (valueString.length() > 14) {
g.drawString(valueString.substring(0, 14),
x, y + (height / 2) + 5);
} else {
g.drawString(valueString, x, y + (height / 2) + 5);
}
}
}
needRedisplay = false;
}
}
class Node {
public static final int OP = 0;
public static final int VALUE = 1;
public static final int CELL = 2;
int type;
Node left;
Node right;
int row;
int column;
float value;
char op;
public Node() {
left = null;
right = null;
value = 0;
row = -1;
column = -1;
op = 0;
type = Node.VALUE;
}
public Node(Node n) {
left = n.left;
right = n.right;
value = n.value;
row = n.row;
column = n.column;
op = n.op;
type = n.type;
}
public void indent(int ind) {
for (int i = 0; i < ind; i++) {
System.out.print(" ");
}
}
public void print(int indentLevel) {
char l[] = new char[1];
indent(indentLevel);
System.out.println("NODE type=" + type);
indent(indentLevel);
switch (type) {
case Node.VALUE:
System.out.println(" value=" + value);
break;
case Node.CELL:
l[0] = (char)((int)'A' + column);
System.out.println(" cell=" + new String(l) + (row+1));
break;
case Node.OP:
System.out.println(" op=" + op);
left.print(indentLevel + 3);
right.print(indentLevel + 3);
break;
}
}
}
class InputField {
int maxchars = 50;
int cursorPos = 0;
Applet app;
String sval;
char buffer[];
int nChars;
int width;
int height;
Color bgColor;
Color fgColor;
public InputField(String initValue, Applet app, int width, int height,
Color bgColor, Color fgColor) {
this.width = width;
this.height = height;
this.bgColor = bgColor;
this.fgColor = fgColor;
this.app = app;
buffer = new char[maxchars];
nChars = 0;
if (initValue != null) {
initValue.getChars(0, initValue.length(), this.buffer, 0);
nChars = initValue.length();
}
sval = initValue;
}
public void setText(String val) {
int i;
for (i=0; i < maxchars; i++) {
buffer[i] = 0;
}
if (val == null) {
sval = "";
} else {
sval = val;
}
nChars = sval.length();
sval.getChars(0, sval.length(), buffer, 0);
}
public String getValue() {
return sval;
}
public void paint(Graphics g, int x, int y) {
g.setColor(bgColor);
g.fillRect(x, y, width, height);
if (sval != null) {
g.setColor(fgColor);
g.drawString(sval, x, y + (height / 2) + 3);
}
}
public void processKey(KeyEvent e) {
char ch = e.getKeyChar();
switch (ch) {
case '\b': // delete
if (nChars > 0) {
nChars--;
sval = new String(buffer, 0, nChars);
}
break;
case '\n': // return
selected();
break;
default:
if (nChars < maxchars && ch >= '0') {
buffer[nChars++] = ch;
sval = new String(buffer, 0, nChars);
}
}
app.repaint();
}
public void keyReleased(KeyEvent e) {
}
public void selected() {
}
}
class SpreadSheetInput
extends InputField {
public SpreadSheetInput(String initValue,
SpreadSheet app,
int width,
int height,
Color bgColor,
Color fgColor) {
super(initValue, app, width, height, bgColor, fgColor);
}
public void selected() {
float f;
switch (sval.charAt(0)) {
case 'v':
String s= sval.substring(1);
try {
int i;
for (i = 0; i < s.length(); i++) {
char c = s.charAt(i);
if (c < '0' || c > '9')
break;
}
s = s.substring(0, i);
f = Float.valueOf(s).floatValue();
((SpreadSheet)app).setCurrentValue(f);
} catch (NumberFormatException e) {
System.out.println("Not a float: '" + s + "'");
}
break;
case 'l':
((SpreadSheet)app).setCurrentValue(Cell.LABEL, sval.substring(1));
break;
case 'u':
((SpreadSheet)app).setCurrentValue(Cell.URL, sval.substring(1));
break;
case 'f':
((SpreadSheet)app).setCurrentValue(Cell.FORMULA, sval.substring(1));
break;
}
}
}
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