The source code shown below comes from two files. The first holds the CalendarPanel class (CalendarPanel.java), and the second controls the Applet(iNetCal.java)
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CalendarPanel.java
import java.awt.*;
import java.util.*;
class CalendarPanel extends Panel {
private boolean visible = false;
private String monthString;
private int date;
private int year;
private int month;
public CalendarPanel() {
super();
validate();
}
static int getMonthDays(int month, int year) {
int numDays=0;
//without next line, leap year isn't calculated properly
switch (month) {
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12: numDays = 31; break;
case 4:
case 6:
case 9:
case 11: numDays = 30; break;
case 2:
if ( ((year % 4 == 0) && (year % 100 != 0)) || (year % 400==0) ) {
numDays = 29;
} else {
numDays = 28;
} break;
}
// System.out.println(numDays);
return numDays;
}
String getMonthName(int month) {
String monthName;
switch (month) {
case 1: monthName = "January"; break;
case 2: monthName = "February"; break;
case 3: monthName = "March"; break;
case 4: monthName = "April"; break;
case 5: monthName = "May"; break;
case 6: monthName = "June"; break;
case 7: monthName = "July"; break;
case 8: monthName = "August"; break;
case 9: monthName = "September"; break;
case 10: monthName = "October"; break;
case 11: monthName = "November"; break;
case 12: monthName = "December"; break;
default: monthName = "invalid month ";break;
}
return monthName;
}
public void showDate(Date d) {
visible = true;
month = d.getMonth()+1;
monthString= getMonthName(month);
date = d.getDate();
year = d.getYear()+1900;
repaint();
}
public void paint(Graphics g) {
int headerHeight;
int currDate;
Date firstDate;
int startDay;
String currCell;
if (visible) {
firstDate = new Date(year-1900, month-1, 1);
startDay = firstDate.getDay();
Dimension d = size();
d.width = (d.width - (d.width % 7)-6);
FontMetrics fontMetrics = g.getFontMetrics(g.getFont());
String header = monthString + " " + java.lang.Integer.toString(date) +", "+ java.lang.Integer.toString(year);
//draw border in the same color as form background
g.setColor(getBackground());
g.setColor(Color.lightGray);
g.draw3DRect(0,0, d.width-1, d.height - 1, true);
g.draw3DRect(3,3, d.width - 7, d.height-7, false);
g.setColor(Color.black);
g.drawRect(0,0,d.width-1, d.height-1);
//draw the header
g.setColor(Color.gray);
headerHeight =fontMetrics.getHeight()+5;
headerHeight = headerHeight+((d.height-8-headerHeight) % 7);
g.fillRect(4,3, d.width - 8, headerHeight);
g.setColor(Color.black);
g.drawRect(4,3, d.width - 8, headerHeight);
//get height centered too on below line-XOPHER
g.drawString(header, (d.width/2)-(fontMetrics.stringWidth(header)/2) ,fontMetrics.getHeight()+3);
//draw cells
int cellY = (d.width-8)/7;
int cellX = (d.height-headerHeight-8)/7;
g.setColor(Color.black);
for (int i=0; i<7; i++) {
for (int j=0; j<7; j++) {
g.drawRect(4 + (i*cellY),headerHeight+3 + (j*cellX), cellY, cellX);
currDate = ((j-1) * 7) + i - startDay + 1;
if (currDate == date) {
g.setColor(Color.green);
g.fillRect(5 + (i*cellY),headerHeight+4 + (j*cellX), cellY-1, cellX-1);
g.setColor(Color.black);
}
currCell = " ";
if (j==0) {
g.drawRect(4 + (i*cellY),headerHeight+3 + (j*cellX), cellY, cellX);
g.setColor(Color.lightGray);
g.fillRect(5 + (i*cellY),headerHeight+4 + (j*cellX), cellY-1, cellX-1);
g.setColor(Color.black);
switch (i) {
case 0: currCell="Sun"; break;
case 1: currCell="Mon"; break;
case 2: currCell="Tue"; break;
case 3: currCell="Wed"; break;
case 4: currCell="Thu"; break;
case 5: currCell="Fri"; break;
case 6: currCell="Sat"; break;
}
} else if (((i >= startDay) || (j>1)) && (currDate <= getMonthDays(month, year))) {
currCell = java.lang.Integer.toString(currDate);
}
g.drawString(currCell, 14 + (i*cellY), 14 + headerHeight+3 + (j*cellX));
if (currCell == " ") {
g.setColor(Color.darkGray);
g.fillRect(5 + (i*cellY),headerHeight+4 + (j*cellX), cellY-1, cellX-1);
g.setColor(Color.black);
}
}
}
}
}
}
CalendarPanel.java
import java.awt.*;
import java.applet.*;
import java.util.*;
public class INetCal extends Applet {
Date d = new Date();
private boolean locked=false;
Panel choicePanel;
Choice monthChoice;
Choice dayChoice;
Choice yearChoice;
Button calcDueDate;
CalendarPanel calPanel;
public void init() {
setBackground(Color.white);
setLayout(new BorderLayout());
choicePanel = new Panel();
add("North", choicePanel);
monthChoice = new Choice();
monthChoice.addItem("January");
monthChoice.addItem("February");
monthChoice.addItem("March");
monthChoice.addItem("April");
monthChoice.addItem("May");
monthChoice.addItem("June");
monthChoice.addItem("July");
monthChoice.addItem("August");
monthChoice.addItem("September");
monthChoice.addItem("October");
monthChoice.addItem("November");
monthChoice.addItem("December");
choicePanel.add(monthChoice);
yearChoice = new Choice();
yearChoice.addItem(java.lang.Integer.toString(d.getYear()+1900-1));
yearChoice.addItem(java.lang.Integer.toString(d.getYear()+1900));
yearChoice.addItem(java.lang.Integer.toString(d.getYear()+1900+1));
yearChoice.addItem(java.lang.Integer.toString(d.getYear()+1900+2));
yearChoice.addItem(java.lang.Integer.toString(d.getYear()+1900+3));
choicePanel.add(yearChoice);
setDayChoice(monthChoice.getSelectedIndex() + 1, yearChoice.getSelectedIndex() -1 + d.getYear());
monthChoice.select(d.getMonth());
dayChoice.select(d.getDate()-1);
yearChoice.select(1);
calcDueDate = new Button("Calculate Due Date");
choicePanel.add(calcDueDate);
calPanel = new CalendarPanel();
add("Center", calPanel);
validate();
}
private void lockDisplay() {
locked = true;
}
private void unLockDisplay() {
locked = false;
}
void setDayChoice(int month, int year) {
int ii;
int day = 0;
lockDisplay();
if (dayChoice != null) {
day = dayChoice.getSelectedIndex();
choicePanel.remove(dayChoice);
}
dayChoice = new Choice();
for (ii = 1; ii <= CalendarPanel.getMonthDays(month, year+1900); ii++) {
dayChoice.addItem(java.lang.Integer.toString(ii));
}
choicePanel.add(dayChoice,1);
if (day <= dayChoice.countItems()-1) {
dayChoice.select(day);
} else {
dayChoice.select(dayChoice.countItems()-1);
}
unLockDisplay();
validate();
}
void printDueDate() {
Date day = new Date(yearChoice.getSelectedIndex() -1 + d.getYear(),
monthChoice.getSelectedIndex(),
dayChoice.getSelectedIndex() + 1);
long dueDate = day.getTime();
//1 ms * 1000= 1 sec * 60 = 1min * 60 = 1 hr * 24 = 1 day
long oneDay = 1000*60*60*24;
long gestation = oneDay * 280;
//following line will cause incorrect date--
//must break it down to the two lines above
//long gestation = 1000*60*60*24*280;
day = null;
dueDate = gestation + dueDate;
day = new Date(dueDate);
calPanel.showDate(day);
}
public void update(Graphics g) {
if (!locked) {
super.update(g);
}
}
public void paint(Graphics g) {
if (!locked) {
super.paint(g);
}
}
public boolean action(Event event, Object arg) {
if (event.target == calcDueDate) {
showStatus("calculating due date...");
printDueDate();
return true;
}
if ((event.target == monthChoice) || (event.target == yearChoice)) {
setDayChoice(monthChoice.getSelectedIndex() + 1, yearChoice.getSelectedIndex() -1 + d.getYear());
return true;
}
return false;
return to geekstuff