|
|
Re: Java Help
|
Posted: Nov 7, 2002 4:16 AM
|
|
Hi
I have gone through your question. I am sending the code that fulfills your requirement. I have made the following changes to your code.
1. Implemented WindowListener interface for DateChooer class.
2.When window was being closed(public void windowClosing(WindowEvent we)) i set a boolean value(isSelected) that notifies whether a date was selected or not, to false.
3. I changed the value of the textfield if and only if the boolean value is true other wise set the value to true.
That is all. Take a look at the code.
/******************************Start of DateChooser class ***********************************/
import javax.swing.*;
import javax.swing.border.*;
import java.awt.event.*;
import java.awt.*;
import java.util.Date;
import java.util.Calendar;
/**
* dialog to allow user to select a date and return
* a java.util.Date object
* Creation date: (2/5/00 10:57:04 AM)
*/
public class DateChooser extends JDialog implements ActionListener {
//TODO: submit to resource bundle for internationalization
private String[] months = {"Jan","Feb", "Mar","Apr", "May","June","July","Aug","Sept","Oct","Nov","Dec"};
private JButton[] days = null;
private JLabel monthLabel = null;
private Calendar calendar = null;
private JPanel mainPanel = null;
private static boolean isSelected=true;
/**
* DateChooser constructor comment.
*/
public DateChooser() {
super();
this.setModal(true);
initialize();
}
/**
* deal with all the buttons that may be pressed
* Creation date: (2/5/00 11:36:11 AM)
* @param e java.awt.event.ActionEvent
*/
public void actionPerformed(ActionEvent e) {
String text;
if (e.getActionCommand().equals("D")){
//return a date
text = ((JButton) e.getSource()).getText();
if (text.length() > 0){
this.returnDate(text);
} else {
Toolkit.getDefaultToolkit().beep();
}
} else {
this.roll(e.getActionCommand());
}
}
/**
* repaint the window with the supplied calendar date
* Creation date: (2/5/00 11:04:03 AM)
* @param d java.util.Date
*/
private void caption() {
Calendar cal = this.getCalendar();
int startPos;
int currentMonth = cal.get(Calendar.MONTH);
//for painting ease, quick display
mainPanel.setVisible(false);
//set month
monthLabel.setText(months[cal.get(Calendar.MONTH)] + " " + cal.get(Calendar.YEAR));
//set to first day
cal.set(cal.get(Calendar.YEAR), cal.get(Calendar.MONTH), 1);
//now work the day labels
startPos = cal.get(Calendar.DAY_OF_WEEK);
for (int i = startPos - 1; i < days.length; i++) {
days.setText(String.valueOf(cal.get(Calendar.DATE)));
cal.roll(Calendar.DATE , true);
if (cal.get(Calendar.DATE) == 1) {
//clear remaining labels going forward
for (int j = i + 1; j < days.length; j++) {
days[j].setText("");
}
break;
}
}
//work first week
for (int h = 0; h < startPos - 1; h++) {
if (cal.get(Calendar.DATE) > 25 ) {
days[h].setText(String.valueOf(cal.get(Calendar.DATE)));
cal.roll(Calendar.DA TE, true);
} else {
days[h].setText("");
}
}
this.setCalendar(cal);
mainPanel.setVisible(true);
}
/**
* Insert the method's description here.
* Creation date: (2/5/00 1:12:24 PM)
* @return java.util.Calendar
*/
public java.util.Calendar getCalendar() {
if (this.calendar == null){
calendar = Calendar.getInstance();
}
return calendar;
}
/**
* set up the layout and look of the dialog
* but don't do any data yet.
* Creation date: (2/5/00 11:02:37 AM)
*/
private void initialize() {
JButton jb;
/* layout:
North panel: month + year display
Center Panel: buttons for the days, 5 by 7 grid
South Panel: navigation buttons */
mainPanel = new JPanel();
JPanel northPanel = new JPanel();
JPanel centerPanel = new JPanel();
JPanel southPanel = new JPanel();
//widgets
//NORTH
monthLabel = new JLabel(months[9] + " 1953");
northPanel.setLayout(new FlowLayout());
northPanel.add(monthLabel);
this.addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent we)
{
DateChooser.isSelected=false;
}
});
//CENTER
centerPanel.setLayout(new GridLayout(5,7));
days = new JButton[35];
for (int i = 0; i <35; i++){
jb = new JButton(String.valueOf(i));
jb.setSize(25,25);
jb.setBorder(new EmptyBorder(1,1,1,1));
jb.setFocusPainted(false);
jb.setActionCommand("D");
jb. addActionListener(this);
days = jb;
centerPanel.add(jb);
}
//SOUTH
southPanel.setLayout(new FlowLayout());
southPanel.add(this.makeButton("<<"));
southPanel.add(this .makeButton("<"));
southPanel.add(this.makeButton(">"));
southPanel.add(t his.makeButton(">>"));
mainPanel.setLayout(new BorderLayout());
mainPanel.add(northPanel, "North");
mainPanel.add(centerPanel,"Center");
mainPanel.add(southPanel, "South");
this.getContentPane().add(mainPanel);
this.setSize(150,150);
capti on();
}
/**
* for testing only.
* Creation date: (2/5/00 11:19:35 AM)
* @param args java.lang.String[]
*/
public static void main(String[] args) {
try{
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (Exception e){}
final DateChooser dc = new DateChooser();
JFrame jf = new JFrame();
jf.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
JPanel jp = new JPanel();
JButton jb = new JButton("...");
final JTextField jff = new JTextField("The date field will hold the result.");
jb.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
dc.show();
java.text.DateFormat df = java.text.DateFormat.getDateInstance(java.text.DateFormat.MEDIUM);
System.out.p rintln(isSelected);
if(isSelected)
jff.setText("" + df.format(dc.getCalendar().getTime()));
else
isSelected=true;
}
});
jp.add(jff);
jp.add(jb);
jf.getContentPane().add(jp);
jf.setSize(300,300);
jf.show();
//set up location of the dialog
dc.setLocationRelativeTo(jb);
}
/**
* return a button to the control Panel
* Creation date: (2/5/00 10:57:59 AM)
* @return java.lang.String
*/
private JButton makeButton(String caption) {
JButton jb = new JButton(caption);
jb.setSize(25,25);
jb.setBorder(new EmptyBorder(1,4,1,4));
jb.setFocusPainted(false);
jb.setActionCommand(caption);
jb.addActionListener(this);
return jb;
}
/**
* roll the calendar to the day
* then hide the dialog
* Creation date: (2/5/00 11:40:31 AM)
* @param day java.lang.String
*/
private void returnDate(String day) {
this.getCalendar().set(this.getCalendar().get(Calendar.YEAR),this.getCalenda r().get(Calendar.MONTH),Integer.parseInt(day));
this.setVisible(false);
}
/**
* which way to roll the calendar
* Creation date: (2/5/00 11:46:42 AM)
* @param direction java.lang.String
*/
private void roll(String direction) {
int field;
if (direction.equals(">>")) calendar.roll(Calendar.YEAR,true);
if (direction.equals(">")) calendar.roll(Calendar.MONTH,true);
if (direction.equals("<<")) calendar.roll(Calendar.YEAR,false);
if (direction.equals("<")) calendar.roll(Calendar.MONTH,false);
caption();
}
/**
* Insert the method's description here.
* Creation date: (2/5/00 1:12:24 PM)
* @param newCalendar java.util.Calendar
*/
public void setCalendar(java.util.Calendar newCalendar) {
calendar = newCalendar;
}
}
|
|
Previous Topic
