本程序改變自網(wǎng)上的一個(gè)datapicker，沒有用javax包，而是基于java.awt包。you can use it in your applet.共四個(gè)文件。
//1.AbsoluteConstraints.java
import java.awt.Dimension;
import java.awt.Point;
public class AbsoluteConstraints
??? implements java.io.Serializable {
? static final long serialVersionUID = 5261460716622152494L;
? public int x;
? public int y;
? public int width = -1;
? public int height = -1;
? public AbsoluteConstraints(Point pos) {
??? this(pos.x, pos.y);
? }
? public AbsoluteConstraints(int x, int y) {
??? this.x = x;
??? this.y = y;
? }
? public AbsoluteConstraints(Point pos, Dimension size) {
??? this.x = pos.x;
??? this.y = pos.y;
??? if (size != null) {
????? this.width = size.width;
????? this.height = size.height;
??? }
? }
? public AbsoluteConstraints(int x, int y, int width, int height) {
??? this.x = x;
??? this.y = y;
??? this.width = width;
??? this.height = height;
? }
? public int getX() {
??? return x;
? }
? public int getY() {
??? return y;
? }
? public int getWidth() {
??? return width;
? }
? public int getHeight() {
??? return height;
? }
? public String toString() {
??? return super.toString() + " [x=" + x + ", y=" + y + ", width=" + width +
??????? ", height=" + height + "]";
? }
}
//2.import java.awt.*;
public class AbsoluteLayout
??? implements LayoutManager2, java.io.Serializable {
? static final long
????? serialVersionUID = -1919857869177070440L;
? protected java.util.Hashtable constraints = new java.util.Hashtable();
? public
????? void addLayoutComponent(String name, Component comp) {
??? throw new IllegalArgumentException();
? }
? public void
????? removeLayoutComponent(Component comp) {
??? constraints.remove(comp);
? }
? public Dimension preferredLayoutSize
????? (Container parent) {
??? int maxWidth = 0;
??? int maxHeight = 0;
??? for (java.util.Enumeration e =
???????? constraints.keys(); e.hasMoreElements(); ) {
????? Component comp = (Component) e.nextElement();
????? AbsoluteConstraints
????????? ac = (AbsoluteConstraints) constraints.get(comp);
????? Dimension size = comp.getPreferredSize();
????? int width =
????????? ac.getWidth();
????? if (width == -1)
??????? width = size.width;
????? int height = ac.getHeight();
????? if (height == -1)
??????? height = size.height;
????? if (ac.x + width > maxWidth)
??????? maxWidth = ac.x + width;
????? if (ac.y + height >
????????? maxHeight)
??????? maxHeight = ac.y + height;
??? }
??? return new Dimension(maxWidth, maxHeight);
? }
? public
????? Dimension minimumLayoutSize(Container parent) {
??? int maxWidth = 0;
??? int maxHeight = 0;
??? for
??????? (java.util.Enumeration e = constraints.keys(); e.hasMoreElements(); ) {
????? Component comp = (Component) e.nextElement();
????? AbsoluteConstraints ac = (AbsoluteConstraints) constraints.get(comp);
????? Dimension size = comp.getMinimumSize();
????? int width = ac.getWidth();
????? if (width == -1)
??????? width = size.width;
????? int height = ac.getHeight();
????? if (height == -1)
??????? height = size.height;
????? if (ac.x + width > maxWidth)
??????? maxWidth = ac.x + width;
????? if
????????? (ac.y + height > maxHeight)
??????? maxHeight = ac.y + height;
??? }
??? return new Dimension(maxWidth, maxHeight);
? }
? public void layoutContainer(Container parent) {
??? for (java.util.Enumeration e = constraints.keys();
???????? e.hasMoreElements(); ) {
????? Component comp = (Component) e.nextElement();
????? AbsoluteConstraints ac =
????????? (AbsoluteConstraints) constraints.get(comp);
????? Dimension size = comp.getPreferredSize();
????? int width = ac.getWidth();
????? if (width == -1)
??????? width = size.width;
????? int height = ac.getHeight();
????? if (height == -1)
??????? height = size.height;
????? comp.setBounds(ac.x, ac.y, width, height);
??? }
? }
? public void addLayoutComponent
????? (Component comp, Object constr) {
??? if (! (constr instanceof AbsoluteConstraints))
????? throw new
????????? IllegalArgumentException();
??? constraints.put(comp, constr);
? }
? public Dimension maximumLayoutSize(Container
???????????????????????????????????? target) {
??? return new Dimension(Integer.MAX_VALUE, Integer.MAX_VALUE);
? }
? public float getLayoutAlignmentX
????? (Container target) {
??? return 0;
? }
? public float getLayoutAlignmentY(Container target) {
??? return 0;
? }
? public void invalidateLayout(Container target) {}
}
// 3DateField.java
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Insets;
import java.awt.Point;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import java.net.URL;
import java.text.DateFormat;
import java.text.ParseException;
import java.util.Date;
import java.awt.*;
public final class DateField
??? extends Panel {
? private static final long serialVersionUID = 1L;
? private final TextField dateText = new TextField(12);
? private final Button dropdownButton = new Button();
? private DatePicker dp;
? private Dialog dlg;
? Point origin = new Point();
? final class Listener
????? extends ComponentAdapter {
??? public void componentHidden(final ComponentEvent evt) {
????? final Date dt = ( (DatePicker) evt.getSource()).getDate();
????? if (null != dt)
??????? dateText.setText(dateToString(dt));
????? dlg.dispose();
??? }
? }
? public DateField() {
??? super();
??? init();
? }
? public DateField(final Date initialDate) {
??? super();
??? init();
??? dateText.setText(dateToString(initialDate));
? }
? public Date getDate() {
??? return stringToDate(dateText.getText());
? }
? public void setDate(Date date) {
??? String v = dateToString(date);
??? if (v == null) {
????? v = "";
??? }
??? dateText.setText(v);
? }
? private void init() {
??? setLayout(new BorderLayout());
??? dateText.setText("");
??? dateText.setEditable(false);
??? dateText.setBackground(new Color(255, 255, 255));
??? add(dateText, BorderLayout.CENTER);
??? dropdownButton.setLabel("選擇");
??? dropdownButton.setBackground(Color.yellow);
??? dropdownButton.addActionListener(new ActionListener() {
????? public void actionPerformed(final ActionEvent evt) {
??????? onButtonClick(evt);
????? }
??? });
??? add(dropdownButton, BorderLayout.EAST);
? }
? private void onButtonClick(final java.awt.event.ActionEvent evt) {
??? if ("".equals(dateText.getText()))
????? dp = new DatePicker();
??? else
????? dp = new DatePicker(stringToDate(dateText.getText()));
??? dp.addComponentListener(new Listener());
??? final Point p = dateText.getLocationOnScreen();
??? p.setLocation(p.getX(), p.getY() - 1 + dateText.getSize().getHeight());
??? dlg = new Dialog(new Frame(), true);
??? dlg.addMouseListener(new MouseAdapter() {
????? public void mousePressed(MouseEvent e) {
??????? origin.x = e.getX();
??????? origin.y = e.getY();
????? }
??? });
??? dlg.addMouseMotionListener(new MouseMotionAdapter() {
????? public void mouseDragged(MouseEvent e) {
??????? Point p = dlg.getLocation();
??????? dlg.setLocation(p.x + e.getX() - origin.x, p.y + e.getY() - origin.y);
????? }
??? });
??? dlg.setLocation(p);
??? dlg.setResizable(false);
??? dlg.setUndecorated(true);
??? dlg.add(dp);
??? dlg.pack();
??? dlg.setVisible(true);
? }
? private static String dateToString(final Date dt) {
??? if (null != dt)
????? return DateFormat.getDateInstance(DateFormat.LONG).format(dt);
??? return null;
? }
? private static Date stringToDate(final String s) {
??? try {
????? return DateFormat.getDateInstance(DateFormat.LONG).parse(s);
??? }
??? catch (ParseException e) {
????? return null;
??? }
? }
? public static void main(String[] args) {
??? Dialog dlg = new Dialog(new Frame(), true);
??? DateField df = new DateField();
?? //dlg.getContentPane().add(df);
?? dlg.add(df);
??? dlg.pack();
??? dlg.setVisible(true);
??? System.out.println(df.getDate().toString());
??? System.exit(0);
? }
}
//4.DatePicker.java
import java.awt.*;
import java.awt.event.*;
import java.util.GregorianCalendar;
import java.util.Date;
import java.util.Calendar;
import java.text.DateFormat;
import java.text.FieldPosition;
/*
import javax.swing.*;
import javax.swing.plaf.BorderUIResource;
*/
public final class DatePicker
??? extends Panel {
? private static final long serialVersionUID = 1L;
? private static final int startX = 10;
? private static final int startY = 60;
? private static final Font smallFont = new Font("Dialog", Font.PLAIN, 10);
? private static final Font largeFont = new Font("Dialog", Font.PLAIN, 12);
? private static final Insets insets = new Insets(2, 2, 2, 2);
? private static final Color highlight = Color.YELLOW;//new Color(255, 255, 204);
? private static final Color white = new Color(255, 255, 255);
? private static final Color gray = new Color(204, 204, 204);
? private Component selectedDay = null;
? private GregorianCalendar selectedDate = null;
? private GregorianCalendar originalDate = null;
? private boolean hideOnSelect = true;
? private final Button backButton = new Button();
? private final Label monthAndYear = new Label();
? private final Button forwardButton = new Button();
? private final Label[] dayHeadings = new Label[] {
????? new Label("日"),
????? new Label("一"),
????? new Label("二"),
????? new Label("三"),
????? new Label("四"),
????? new Label("五"),
????? new Label("六")};
? private final Label[][] daysInMonth = new Label[][] {
????? {
????? new Label(), new Label(),
????? new Label(), new Label(),
????? new Label(), new Label(),
????? new Label()}
????? , {
????? new Label(),
????? new Label(), new Label(),
????? new Label(), new Label(),
????? new Label(), new Label()}
????? , {
????? new Label(), new Label(),
????? new Label(), new Label(),
????? new Label(), new Label(),
????? new Label()}
????? , {
????? new Label(),
????? new Label(), new Label(),
????? new Label(), new Label(),
????? new Label(), new Label()}
????? , {
????? new Label(), new Label(),
????? new Label(), new Label(),
????? new Label(), new Label(),
????? new Label()}
????? , {
????? new Label(),
????? new Label(), new Label(),
????? new Label(), new Label(),
????? new Label(), new Label()}
? };
? private final Button todayButton = new Button();
? private final Button cancelButton = new Button();
? public DatePicker() {
??? super();
??? selectedDate = getToday();
??? init();
? }
? public DatePicker(final Date initialDate) {
??? super();
??? if (null == initialDate)
????? selectedDate = getToday();
??? else
????? (selectedDate = new GregorianCalendar()).setTime(initialDate);
??? originalDate = new GregorianCalendar(selectedDate.get(Calendar.YEAR),
???????????????????????????????????????? selectedDate.get(Calendar.MONTH),
???????????????????????????????????????? selectedDate.get(Calendar.DATE));
??? init();
? }
? public boolean isHideOnSelect() {
??? return hideOnSelect;
? }
? public void setHideOnSelect(final boolean hideOnSelect) {
??? if (this.hideOnSelect != hideOnSelect) {
????? this.hideOnSelect = hideOnSelect;
????? initButtons(false);
??? }
? }
? public Date getDate() {
??? if (null != selectedDate)
????? return selectedDate.getTime();
??? return null;
? }
? private void init() {
??? setLayout(new AbsoluteLayout());
??? /*
??? this.setMinimumSize(new Dimension(161, 226));
??? this.setMaximumSize(getMinimumSize());
??? this.setPreferredSize(getMinimumSize());
??? this.setBorder(new BorderUIResource.EtchedBorderUIResource());
??? */
?? this.setSize(new Dimension(161, 226));
??? backButton.setFont(smallFont);
??? backButton.setLabel("<");
? //? backButton.setSize(insets);
?//?? backButton.setDefaultCapable(false);
??? backButton.addActionListener(new ActionListener() {
????? public void actionPerformed(final ActionEvent evt) {
??????? onBackClicked(evt);
????? }
??? });
??? add(backButton, new AbsoluteConstraints(10, 10, 20, 20));
??? monthAndYear.setFont(largeFont);
??? monthAndYear.setAlignment((int)TextField.CENTER_ALIGNMENT);
??? monthAndYear.setText(formatDateText(selectedDate.getTime()));
??? add(monthAndYear, new AbsoluteConstraints(30, 10, 100, 20));
??? forwardButton.setFont(smallFont);
??? forwardButton.setLabel(">");
?//?? forwardButton.setMargin(insets);
//??? forwardButton.setDefaultCapable(false);
??? forwardButton.addActionListener(new ActionListener() {
????? public void actionPerformed(final ActionEvent evt) {
??????? onForwardClicked(evt);
????? }
??? });
??? add(forwardButton, new AbsoluteConstraints(130, 10, 20, 20));
??? int x = startX;
??? for (int ii = 0; ii < dayHeadings.length; ii++) {
??? //? dayHeadings[ii].setOpaque(true);
????? dayHeadings[ii].setBackground(Color.LIGHT_GRAY);
????? dayHeadings[ii].setForeground(Color.WHITE);
????? dayHeadings[ii].setAlignment((int)TextField.CENTER_ALIGNMENT);
??? //? dayHeadings[ii].setHorizontalAlignment(Label.CENTER);
????? add(dayHeadings[ii], new AbsoluteConstraints(x, 40, 21, 21));
????? x += 20;
??? }
??? x = startX;
??? int y = startY;
??? for (int ii = 0; ii < daysInMonth.length; ii++) {
????? for (int jj = 0; jj < daysInMonth[ii].length; jj++) {
????? //? daysInMonth[ii][jj].setOpaque(true);
??????? daysInMonth[ii][jj].setBackground(white);
??????? daysInMonth[ii][jj].setFont(smallFont);
???? //?? daysInMonth[ii][jj].setHorizontalAlignment(Label.CENTER);
??????? daysInMonth[ii][jj].setText("");
??????? daysInMonth[ii][jj].addMouseListener(new MouseAdapter() {
????????? public void mouseClicked(final MouseEvent evt) {
??????????? onDayClicked(evt);
????????? }
??????? });
??????? add(daysInMonth[ii][jj], new AbsoluteConstraints(x, y, 21, 21));
??????? x += 20;
????? }
????? x = startX;
????? y += 20;
??? }
??? initButtons(true);
??? calculateCalendar();
? }
? private void initButtons(final boolean firstTime) {
??? if (firstTime) {
????? final Dimension buttonSize = new Dimension(68, 24);
????? todayButton.setLabel("今天");
????? todayButton.setSize(buttonSize);
????? /*
????? todayButton.setMargin(insets);
????? todayButton.setMaximumSize(buttonSize);
????? todayButton.setMinimumSize(buttonSize);
????? todayButton.setPreferredSize(buttonSize);
????? todayButton.setDefaultCapable(true);
????? todayButton.setSelected(true);
????? */
????? todayButton.addActionListener(new ActionListener() {
??????? public void actionPerformed(final ActionEvent evt) {
????????? onToday(evt);
??????? }
????? });
????? cancelButton.setLabel("取消");
????? cancelButton.setSize(buttonSize);
????? /*
????? cancelButton.setMargin(insets);
????? cancelButton.setMaximumSize(buttonSize);
????? cancelButton.setMinimumSize(buttonSize);
????? cancelButton.setPreferredSize(buttonSize);
????? */
????? cancelButton.addActionListener(new ActionListener() {
??????? public void actionPerformed(final ActionEvent evt) {
????????? onCancel(evt);
??????? }
????? });
??? }
??? else {
????? this.remove(todayButton);
????? this.remove(cancelButton);
??? }
??? if (hideOnSelect) {
????? add(todayButton, new AbsoluteConstraints(25, 190, 52, -1));
????? add(cancelButton, new AbsoluteConstraints(87, 190, 52, -1));
??? }
??? else {
????? add(todayButton, new AbsoluteConstraints(55, 190, 52, -1));
??? }
? }
? private void onToday(final java.awt.event.ActionEvent evt) {
??? selectedDate = getToday();
??? setVisible(!hideOnSelect);
??? if (isVisible()) {
????? monthAndYear.setText(formatDateText(selectedDate.getTime()));
????? calculateCalendar();
??? }
? }
? private void onCancel(final ActionEvent evt) {
??? selectedDate = originalDate;
??? setVisible(!hideOnSelect);
? }
? private void onForwardClicked(final java.awt.event.ActionEvent evt) {
??? final int day = selectedDate.get(Calendar.DATE);
??? selectedDate.set(Calendar.DATE, 1);
??? selectedDate.add(Calendar.MONTH, 1);
??? selectedDate.set(Calendar.DATE,
???????????????????? Math.min(day, calculateDaysInMonth(selectedDate)));
??? monthAndYear.setText(formatDateText(selectedDate.getTime()));
??? calculateCalendar();
? }
? private void onBackClicked(final java.awt.event.ActionEvent evt) {
??? final int day = selectedDate.get(Calendar.DATE);
??? selectedDate.set(Calendar.DATE, 1);
??? selectedDate.add(Calendar.MONTH, -1);
??? selectedDate.set(Calendar.DATE,
???????????????????? Math.min(day, calculateDaysInMonth(selectedDate)));
??? monthAndYear.setText(formatDateText(selectedDate.getTime()));
??? calculateCalendar();
? }
? private void onDayClicked(final java.awt.event.MouseEvent evt) {
??? final Label fld = (Label) evt.getSource();
??? if (!"".equals(fld.getText())) {
????? fld.setBackground(highlight);
????? selectedDay = fld;
????? selectedDate.set(Calendar.DATE, Integer.parseInt(fld.getText()));
????? setVisible(!hideOnSelect);
??? }
? }
? private static GregorianCalendar getToday() {
??? final GregorianCalendar gc = new GregorianCalendar();
??? gc.set(Calendar.HOUR_OF_DAY, 0);
??? gc.set(Calendar.MINUTE, 0);
??? gc.set(Calendar.SECOND, 0);
??? gc.set(Calendar.MILLISECOND, 0);
??? return gc;
? }
? private void calculateCalendar() {
??? if (null != selectedDay) {
????? selectedDay.setBackground(white);
????? selectedDay = null;
??? }
??? final GregorianCalendar c = new GregorianCalendar(selectedDate.get(Calendar.
??????? YEAR), selectedDate.get(Calendar.MONTH), 1);
??? final int maxDay = calculateDaysInMonth(c);
??? final int selectedDay = Math.min(maxDay, selectedDate.get(Calendar.DATE));
??? int dow = c.get(Calendar.DAY_OF_WEEK);
??? for (int dd = 0; dd < dow; dd++) {
????? daysInMonth[0][dd].setText("");
??? }
??? int week;
??? do {
????? week = c.get(Calendar.WEEK_OF_MONTH);
????? dow = c.get(Calendar.DAY_OF_WEEK);
????? final Label fld = this.daysInMonth[week - 1][dow - 1];
????? fld.setText(Integer.toString(c.get(Calendar.DATE)));
????? if (selectedDay == c.get(Calendar.DATE)) {
??????? fld.setBackground(highlight);
??????? this.selectedDay = fld;
????? }
????? if (c.get(Calendar.DATE) >= maxDay)
??????? break;
????? c.add(Calendar.DATE, 1);
??? }
??? while (c.get(Calendar.DATE) <= maxDay); week--;
??? for (int ww = week; ww < daysInMonth.length; ww++) {
????? for (int dd = dow; dd < daysInMonth[ww].length; dd++) {
??????? daysInMonth[ww][dd].setText("");
????? }
????? dow = 0;
??? }
??? c.set(Calendar.DATE, selectedDay);
??? selectedDate = c;
? }
? private static int calculateDaysInMonth(final Calendar c) {
??? int daysInMonth = 0;
??? switch (c.get(Calendar.MONTH)) {
????? case 0:
????? case 2:
????? case 4:
????? case 6:
????? case 7:
????? case 9:
????? case 11:
??????? daysInMonth = 31;
??????? break;
????? case 3:
????? case 5:
????? case 8:
????? case 10:
??????? daysInMonth = 30;
??????? break;
????? case 1:
??????? final int year = c.get(Calendar.YEAR);
??????? daysInMonth = (0 == year % 1000) ? 29 : (0 == year % 100) ? 28 :
??????????? (0 == year % 4) ? 29 : 28;
??????? break;
??? }
??? return daysInMonth;
? }
? private static String formatDateText(final Date dt) {
??? final DateFormat df = DateFormat.getDateInstance(DateFormat.LONG);
??? final StringBuffer mm = new StringBuffer();
??? final StringBuffer yy = new StringBuffer();
??? final FieldPosition mmfp = new FieldPosition(DateFormat.MONTH_FIELD);
??? final FieldPosition yyfp = new FieldPosition(DateFormat.YEAR_FIELD);
??? df.format(dt, mm, mmfp);
??? df.format(dt, yy, yyfp);
??? return (mm.toString().substring(mmfp.getBeginIndex(), mmfp.getEndIndex()) +
??????????? "月 " +
??????????? yy.toString().substring(yyfp.getBeginIndex(), yyfp.getEndIndex()) +
??????????? "年");
? }
}