Re: Hi, is there any component alike date picker in Visual Basic?

Manoj Jain wrote:


Here is one I wrote. It needs some work but it should do what you want.
  If you make any good changes to it please send them to me.

//
//
//
// JDateChooser
//
// Written by: Knute Johnson
//
// Date Version Modification
// --------- -------
---------------------------------------------------
// 04 jun 05 01.00 incept
//
//
// Constructor Summary
// JDateChooser()
// Creates a new JDateChooser with today's date displayed
// JDateChooser(GregorianCalendar gc)
// Creates a new JDateChooser with the specified date displayed
//
// Method Summary
// GregorianCalendar getCalendar()
// Gets the selected date
// void setCalendar(GregorianCalendar gc)
// Sets and display's the specified date
// static GregorianCalendar showDialog(Component comp)
// Displays a JDateChooser in a modal JDialog and returns the
// selected date or null if dismissed.
// static GregorianCalendar showDialog(Component
comp,GregorianCalendar gc)
// Displays a JDateChooser in a modal JDialog with the
specified date
// and returns the selected date or null if dismissed.
//
//
//

package com.knutejohnson.components;

import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;

public class JDateChooser extends JComponent {
     private static final String[] dayStr =
      {"SUN","MON","TUE","WED","THU","FRI","SAT"};
     private static final String[] monthStr =
      {"JANUARY ","FEBRUARY ","MARCH ","APRIL ","MAY ","JUNE ","JULY ",
       "AUGUST ","SEPTEMBER ","OCTOBER ","NOVEMBER ","DECEMBER "};
     private int[] daysInMonth = {31,28,31,30,31,30,31,31,30,31,30,31};

     private GregorianCalendar gc;
     private int thisYear,thisMonth,today;
     private int selectedDay;

     private JButton previousButton,nextButton;
     private JLabel[] dayOfWeekLabels = new JLabel[7];
     private JLabel[] dayOfMonthLabels = new JLabel[42];
     private JLabel monthYearLabel;

     private static JDialog dialog;
     private static GregorianCalendar retcod;

     public JDateChooser() {
         this(new GregorianCalendar());
     }

     public JDateChooser(GregorianCalendar calendar) {
         gc = calendar;
         thisYear = gc.get(Calendar.YEAR);
         thisMonth = gc.get(Calendar.MONTH);
         today = selectedDay = gc.get(Calendar.DAY_OF_MONTH);

         setLayout(new GridBagLayout());

         GridBagConstraints c = new GridBagConstraints();
         c.gridx = c.gridy = 0; c.insets = new Insets(2,2,2,2);
         c.weightx = 1.0;

         c.anchor = GridBagConstraints.WEST;
         previousButton = new JButton("<");
         previousButton.addActionListener(new ActionListener() {
             public void actionPerformed(ActionEvent ae) {
                 gc.add(Calendar.MONTH,-1);
                 int mon = gc.get(Calendar.MONTH);
                 if (selectedDay > daysInMonth[mon])
                     selectedDay = 1;
                 drawCalendar();
             }
         });
         add(previousButton,c);

         ++c.gridx; c.anchor = GridBagConstraints.CENTER;
         monthYearLabel = new JLabel(" ",JLabel.CENTER);
         add(monthYearLabel,c);

         ++c.gridx; c.anchor = GridBagConstraints.EAST;
         nextButton = new JButton(">");
         nextButton.addActionListener(new ActionListener() {
             public void actionPerformed(ActionEvent ae) {
                 gc.add(Calendar.MONTH,1);
                 int mon = gc.get(Calendar.MONTH);
                 if (selectedDay > daysInMonth[mon])
                     selectedDay = 1;
                 drawCalendar();
             }
         });
         add(nextButton,c);

         MouseListener ml = new MouseAdapter() {
             public void mouseClicked(MouseEvent me) {
                 JLabel dayLabel = (JLabel)me.getSource();
                 String str = dayLabel.getText();
                 try {
                     int num = Integer.parseInt(str);
                     gc.set(Calendar.DAY_OF_MONTH,num);
                     selectedDay = num;
                     drawCalendar();
                 } catch (NumberFormatException nfe) {
                 }
             }
         };

         c.gridx = 0; ++c.gridy; c.gridwidth = 3;
         c.anchor = GridBagConstraints.CENTER;
         JPanel panel = new JPanel(new GridLayout(7,7,1,1));

         for (int i=0; i<dayStr.length; i++) {
             dayOfWeekLabels[i] = new JLabel(dayStr[i],JLabel.CENTER);
             panel.add(dayOfWeekLabels[i]);
         }
         for (int i=0; i<dayOfMonthLabels.length; i++) {
             dayOfMonthLabels[i] = new JLabel(" ",JLabel.CENTER);
             dayOfMonthLabels[i].setOpaque(true);
             dayOfMonthLabels[i].addMouseListener(ml);
             panel.add(dayOfMonthLabels[i]);
         }

         drawCalendar();

         add(panel,c);
     }

     private void drawCalendar() {
         int month = gc.get(Calendar.MONTH);
         int year = gc.get(Calendar.YEAR);
         if (gc.isLeapYear(year))
             daysInMonth[1] = 29;
         else
             daysInMonth[1] = 28;

         monthYearLabel.setText(monthStr[month]+Integer.toString(year));

         gc.set(Calendar.DAY_OF_MONTH,1);
         int firstDayOfMonth = gc.get(Calendar.DAY_OF_WEEK);
         gc.set(Calendar.DAY_OF_MONTH,selectedDay);

         int day = 1;
         for (int i=0; i<42; i++) {
             if (i >= (firstDayOfMonth - 1) &&
              i < (daysInMonth[month]+firstDayOfMonth-1)) {
                 dayOfMonthLabels[i].setText(Integer.toString(day));
                 if (day == today && month == thisMonth && year == thisYear)
                     dayOfMonthLabels[i].setForeground(Color.RED);
                 else
                     dayOfMonthLabels[i].setForeground(Color.BLACK);
                 if (day == selectedDay)
                     dayOfMonthLabels[i].setBackground(new Color(0xa0a0a0));
                 else
                     dayOfMonthLabels[i].setBackground(Color.WHITE);
                 ++day;
             } else {
                 dayOfMonthLabels[i].setText(" ");
                 dayOfMonthLabels[i].setBackground(new Color(0xe0e0e0));
             }
         }
     }

     public GregorianCalendar getCalendar() {
         return new GregorianCalendar(gc.get(Calendar.YEAR),
          gc.get(Calendar.MONTH),selectedDay);
     }

     public void setCalendar(GregorianCalendar calendar) {
         gc = calendar;
         drawCalendar();
     }

     public static GregorianCalendar showDialog(Component comp) {
         return showDialog(comp, new GregorianCalendar());
     }

     public static GregorianCalendar showDialog(Component comp,
      GregorianCalendar calendar) {
         GridBagConstraints c = new GridBagConstraints();
         c.gridx = c.gridy = 0; c.insets = new Insets(2,2,2,2);

         c.gridwidth = 2;
         JFrame f = new JFrame();
         dialog = new JDialog(f,"Select Date",true);
         dialog.setLayout(new GridBagLayout());
         dialog.addWindowListener(new WindowAdapter() {
             public void windowClosing(WindowEvent we) {
                 retcod = null;
             }
         });
         final JDateChooser dc = new JDateChooser(calendar);
         dialog.add(dc,c);

         ++c.gridy; c.gridwidth = 1; c.anchor = GridBagConstraints.WEST;
         JButton okButton = new JButton(" OK ");
         okButton.addActionListener(new ActionListener() {
             public void actionPerformed(ActionEvent ae) {
                 retcod = dc.getCalendar();
                 dialog.dispose();
             }
         });
         dialog.add(okButton,c);

         ++c.gridx; c.anchor = GridBagConstraints.EAST;
         JButton cancelButton = new JButton("Cancel");
         cancelButton.addActionListener(new ActionListener() {
             public void actionPerformed(ActionEvent ae) {
                 retcod = null;
                 dialog.dispose();
             }
         });
         dialog.add(cancelButton,c);

         dialog.pack();
         dialog.setLocationRelativeTo(comp);
         dialog.setVisible(true);

         return retcod;
     }

     public void setFont(Font font) {
         previousButton.setFont(font);
         nextButton.setFont(font);
         for (int i=0; i<dayOfWeekLabels.length; i++)
             dayOfWeekLabels[i].setFont(font);
         for (int i=0; i<dayOfMonthLabels.length; i++)
             dayOfMonthLabels[i].setFont(font);
         monthYearLabel.setFont(font);
     }

     public static void main(String[] args) {
         Runnable r = new Runnable() {
             public void run() {
                 JFrame.setDefaultLookAndFeelDecorated(true);
                 JDialog.setDefaultLookAndFeelDecorated(true);
                 System.setProperty("swing.aatext","true");
                 final JDateChooser dc = new JDateChooser();
                 final JFrame f = new JFrame();
                 f.setLayout(new FlowLayout());
                 f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                 f.add(dc);
                 final JButton b = new JButton("DateChooser");
                 b.addActionListener(new ActionListener() {
                     public void actionPerformed(ActionEvent ae) {
                         System.out.println(showDialog(b));
                     }
                 });
                 f.add(b);
                 f.pack();
                 f.setVisible(true);
             }
         };
         EventQueue.invokeLater(r);
     }
}

--

Knute Johnson
email s/nospam/knute/