电脑技术学习

改写的基于SWING的日期选择控件

dn001
内容: http://www.matrix.org.cn/blog/liu2liu2

上次公司需要，搞了一个SWING的Aapplication的DEMO，重新弄了一般SWING，可惜最后无疾而终，可悲.....
最近离职，把以前的东西整理了一下，觉得多少有点用处，写下算是悼念吧！
这是其中日期选择控件的代码，改编自网上某个程序(记不得了)，界面如下所示：

IMG http://www.matrix.org.cn/blog/liu2liu2/images/swing-datepicker.png[/IMG]

源代码：
//DatePicker.java
package com.kxsoft.component;

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 JPanel {

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 = 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 JButton backButton = new JButton();

private final JLabel monthAndYear = new JLabel();

private final JButton forwardButton = new JButton();

private final JLabel[] dayHeadings = new JLabel[]{
new JLabel("日"),
new JLabel("一"),
new JLabel("二"),
new JLabel("三"),
new JLabel("四"),
new JLabel("五"),
new JLabel("六")};

private final JLabel[][] daysInMonth = new JLabel[][]{
{new JLabel(),
new JLabel(),
new JLabel(),
new JLabel(),
new JLabel(),
new JLabel(),
new JLabel()},
{new JLabel(),
new JLabel(),
new JLabel(),
new JLabel(),
new JLabel(),
new JLabel(),
new JLabel()},
{new JLabel(),
new JLabel(),
new JLabel(),
new JLabel(),
new JLabel(),
new JLabel(),
new JLabel()},
{new JLabel(),
new JLabel(),
new JLabel(),
new JLabel(),
new JLabel(),
new JLabel(),
new JLabel()},
{new JLabel(),
new JLabel(),
new JLabel(),
new JLabel(),
new JLabel(),
new JLabel(),
new JLabel()},
{new JLabel(),
new JLabel(),
new JLabel(),
new JLabel(),
new JLabel(),
new JLabel(),
new JLabel()}
};

private final JButton todayButton = new JButton();

private final JButton cancelButton = new JButton();

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());

backButton.setFont(smallFont);
backButton.setText("<");
backButton.setMargin(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.setHorizontalAlignment(JTextField.CENTER);
monthAndYear.setText(formatDateText(selectedDate.getTime()));
add(monthAndYear, new AbsoluteConstraints(30, 10, 100, 20));

forwardButton.setFont(smallFont);
forwardButton.setText(">");
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].setHorizontalAlignment(JLabel.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(JLabel.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.setText("今天");
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.setText("取消");
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 javax.swing.JLabel fld = (javax.swing.JLabel) 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 JLabel 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");
}

}





//DataField.java
package com.kxsoft.component;

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 javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;

public final class DateField extends JPanel {

  private static final long serialVersionUID = 1L;

  private final JTextField dateText = new JTextField(12);

  private final JButton dropdownButton = new JButton();

  private DatePicker dp;

  private JDialog 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);

    URL url = DateField.class.getResource("/com/kxsoft/component/dropdown.gif");
    ImageIcon icon = new ImageIcon(url);
    dropdownButton.setIcon(icon);
    dropdownButton.setMargin(new Insets(2, 2, 2, 2));
    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 JDialog(new JFrame(), 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.getContentPane().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) {
    JDialog dlg = new JDialog(new JFrame(), true);
    DateField df = new DateField();
    dlg.getContentPane().add(df);
    dlg.pack();
    dlg.setVisible(true);
    System.out.println(df.getDate().toString());
    System.exit(0);
  }
}
 
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http://www.matrix.org.cn/blog/liu2l 
        
 标签： 控件

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