Java Tutorial/Swing/JPanel
Содержание
A basic panel that displays a small up or down arrow.
<source lang="java">
/*
* JCommon : a free general purpose class library for the Java(tm) platform * * * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors. * * Project Info: http://www.jfree.org/jcommon/index.html * * This library is free software; you can redistribute it and/or modify it * under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation; either version 2.1 of the License, or * (at your option) any later version. * * This library is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public * License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, * USA. * * [Java is a trademark or registered trademark of Sun Microsystems, Inc. * in the United States and other countries.] * * --------------- * ArrowPanel.java * --------------- * (C) Copyright 2002-2004, by Object Refinery Limited. * * Original Author: David Gilbert (for Object Refinery Limited); * Contributor(s): -; * * $Id: ArrowPanel.java,v 1.6 2007/11/02 17:50:36 taqua Exp $ * * Changes * ------- * 25-Sep-2002 : Version 1 (DG); * 13-Oct-2002 : Added Javadocs (DG); * */
import java.awt.Dimension; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.Insets; import java.awt.Polygon; import java.awt.Shape; import java.awt.geom.Rectangle2D; import javax.swing.JPanel; /**
* A basic panel that displays a small up or down arrow. * * @author David Gilbert */
public class ArrowPanel extends JPanel {
/** A constant for the up arrow. */
public static final int UP = 0;
/** A constant for the down arrow. */
public static final int DOWN = 1;
/** The arrow type. */
private int type = UP;
/** The available area. */
private Rectangle2D available = new Rectangle2D.Float();
/**
* Creates a new arrow panel.
*
* @param type
* the arrow type.
*/
public ArrowPanel(final int type) {
this.type = type;
setPreferredSize(new Dimension(14, 9));
}
/**
* Paints the arrow panel.
*
* @param g
* the graphics device for drawing on.
*/
public void paintComponent(final Graphics g) {
super.paintComponent(g);
final Graphics2D g2 = (Graphics2D) g;
// first determine the size of the drawing area...
final Dimension size = getSize();
final Insets insets = getInsets();
this.available.setRect(insets.left, insets.top, size.getWidth() - insets.left - insets.right,
size.getHeight() - insets.top - insets.bottom);
g2.translate(insets.left, insets.top);
g2.fill(getArrow(this.type));
}
/**
* Returns a shape for the arrow.
*
* @param t
* the arrow type.
*
* @return the arrow shape.
*/
private Shape getArrow(final int t) {
switch (t) {
case UP:
return getUpArrow();
case DOWN:
return getDownArrow();
default:
return getUpArrow();
}
}
/**
* Returns an up arrow.
*
* @return an up arrow.
*/
private Shape getUpArrow() {
final Polygon result = new Polygon();
result.addPoint(7, 2);
result.addPoint(2, 7);
result.addPoint(12, 7);
return result;
}
/**
* Returns a down arrow.
*
* @return a down arrow.
*/
private Shape getDownArrow() {
final Polygon result = new Polygon();
result.addPoint(7, 7);
result.addPoint(2, 2);
result.addPoint(12, 2);
return result;
}
}</source>
A JPanel with a textured background.
<source lang="java">
/*
* TexturedPanel.java * 2006-11-02 */
//cb.aloe.decor; import java.awt.Color; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.Image; import java.awt.Insets; import java.awt.Paint; import java.awt.Rectangle; import java.awt.TexturePaint; import java.awt.image.BufferedImage; import javax.swing.Icon; import javax.swing.JPanel; /**
* A JPanel with a textured background. * * @author Christopher Bach */
public class TexturedPanel extends JPanel {
private TexturePaint ourPainter = null;
private Color ourDefaultForeground = Color.white;
private Color ourDefaultBackground = Color.gray;
/**
* Creates a new TexturedPanel with a simple striped pattern.
*/
public TexturedPanel() {
super();
ourDefaultForeground = Color.white;
ourDefaultBackground = getBackground();
setupDefaultPainter(ourDefaultForeground, ourDefaultBackground);
}
/**
* Creates a new TexturedPanel with a simple striped pattern consisting of the
* given foreground and background colors.
*/
public TexturedPanel(Color foreground, Color background) {
super();
ourDefaultForeground = (foreground != null ? foreground : Color.white);
ourDefaultBackground = (background != null ? background : getBackground());
setupDefaultPainter(ourDefaultForeground, ourDefaultBackground);
}
/**
* Creates a new TexturedPanel with a simple pattern based on the provided
* texture map and consisting of the given foreground and background colors.
*/
public TexturedPanel(Color foreground, Color background, boolean[][] texture) {
super();
ourDefaultForeground = (foreground != null ? foreground : Color.white);
ourDefaultBackground = (background != null ? background : getBackground());
setupTexturePainter(ourDefaultForeground, ourDefaultBackground, texture, 1);
}
/**
* Creates a new TexturedPanel with a simple pattern based on the provided
* texture map and consisting of the given foreground and background colors.
*/
public TexturedPanel(Color foreground, Color background, boolean[][] texture, int scale) {
super();
ourDefaultForeground = (foreground != null ? foreground : Color.white);
ourDefaultBackground = (background != null ? background : getBackground());
setupTexturePainter(ourDefaultForeground, ourDefaultBackground, texture, scale);
}
/**
* Creates a new TexturedPanel that tiles the provided image.
*/
public TexturedPanel(Image texture) {
super();
ourDefaultForeground = Color.white;
ourDefaultBackground = getBackground();
if (texture != null)
setupImagePainter(texture);
else
setupDefaultPainter(ourDefaultForeground, ourDefaultBackground);
}
/**
* Creates a new TexturedPanel that tiles the provided icon.
*/
public TexturedPanel(Icon textureIcon) {
super();
ourDefaultForeground = Color.white;
ourDefaultBackground = getBackground();
if (textureIcon != null) {
setupIconPainter(textureIcon);
}
else
setupDefaultPainter(ourDefaultForeground, ourDefaultBackground);
}
/**
* Sets up this TexturedPanel to paint a simple background based on the
* provided texture and consisting of the provided colors.
*/
public void setTexture(Color foreground, Color background, boolean[][] texture) {
if (foreground != null && background != null && texture != null && texture.length > 0
&& texture[0].length > 0) {
setupTexturePainter(foreground, background, texture, 1);
}
}
/**
*
*/
public void setTexture(Color foreground, Color background, boolean[][] texture, int scale) {
setupTexturePainter(foreground, background, texture, scale);
}
/**
* Sets up this TexturedPanel to paint a striped background consisting of the
* provided colors.
*/
public void setTextureColors(Color foreground, Color background) {
if (foreground != null && background != null) {
ourDefaultForeground = foreground;
ourDefaultBackground = background;
setupDefaultPainter(foreground, background);
}
}
/**
* Sets up this TexturedPanel to paint a tiled background consisting of the
* provided image. If the image is null, the background will revert to a
* striped texture consisting of the last known colors.
*/
public void setTextureImage(Image texture) {
if (texture != null)
setupImagePainter(texture);
else
setupDefaultPainter(ourDefaultForeground, ourDefaultBackground);
}
/**
* Sets up this TexturedPanel to paint a tiled background consisting of the
* provided icon. If the icon is null, the background will revert to a striped
* texture consisting of the last known colors.
*/
public void setTextureIcon(Icon textureIcon) {
if (textureIcon != null) {
setupIconPainter(textureIcon);
}
else
setupDefaultPainter(ourDefaultForeground, ourDefaultBackground);
}
/**
* Returns the image buffer used by this TexturedPanel"s painter.
*/
public Image getTexture() {
if (ourPainter == null)
return null;
else
return ourPainter.getImage();
}
/**
* Creates a new TexturePaint using the provided colors.
*/
private void setupDefaultPainter(Color foreground, Color background) {
if (foreground == null || background == null) {
ourPainter = null;
return;
}
BufferedImage buff = new BufferedImage(6, 6, BufferedImage.TYPE_INT_ARGB_PRE);
Graphics2D g2 = buff.createGraphics();
g2.setColor(background);
g2.fillRect(0, 0, 6, 6);
g2.setColor(foreground);
g2.drawLine(0, 2, 6, 2);
g2.drawLine(0, 5, 6, 5);
ourPainter = new TexturePaint(buff, new Rectangle(0, 0, 6, 6));
g2.dispose();
}
/**
* Creates a new TexturePaint using the provided colors and texture map.
*/
private void setupTexturePainter(Color foreground, Color background, boolean[][] texture,
int scale) {
if (texture == null || texture.length < 1 || texture[0].length < 1) {
setupDefaultPainter(foreground, background);
return;
}
else if (foreground == null || background == null) {
ourPainter = null;
return;
}
scale = Math.max(1, scale);
int w = texture[0].length;
int h = texture.length;
BufferedImage buff = new BufferedImage(w * scale, h * scale, BufferedImage.TYPE_INT_ARGB_PRE);
Graphics2D g2 = buff.createGraphics();
g2.setColor(background);
g2.fillRect(0, 0, w * scale, h * scale);
g2.setColor(foreground);
for (int i = 0; i < h; i++) {
for (int j = 0; j < w; j++) {
try {
if (texture[i][j])
g2.fillRect(j * scale, i * scale, scale, scale);
}
// g2.drawLine(j, i, j, i); }
catch (ArrayIndexOutOfBoundsException aob) {
}
}
}
ourPainter = new TexturePaint(buff, new Rectangle(0, 0, w * scale, h * scale));
g2.dispose();
}
/**
* Creates a new TexturePaint using the provided image.
*/
private void setupImagePainter(Image texture) {
if (texture == null) {
ourPainter = null;
return;
}
int w = texture.getWidth(this);
int h = texture.getHeight(this);
if (w <= 0 || h <= 0) {
ourPainter = null;
return;
}
BufferedImage buff = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB_PRE);
Graphics2D g2 = buff.createGraphics();
g2.drawImage(texture, 0, 0, this);
ourPainter = new TexturePaint(buff, new Rectangle(0, 0, w, h));
g2.dispose();
}
/**
* Creates a new TexturePaint using the provided icon.
*/
private void setupIconPainter(Icon texture) {
if (texture == null) {
ourPainter = null;
return;
}
int w = texture.getIconWidth();
int h = texture.getIconHeight();
if (w <= 0 || h <= 0) {
ourPainter = null;
return;
}
BufferedImage buff = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB_PRE);
Graphics2D g2 = buff.createGraphics();
texture.paintIcon(this, g2, 0, 0);
ourPainter = new TexturePaint(buff, new Rectangle(0, 0, w, h));
g2.dispose();
}
/**
* Paints this component with its textured background.
*/
protected void paintComponent(Graphics g) {
super.paintComponent(g);
if (ourPainter != null) {
int w = getWidth();
int h = getHeight();
Insets in = getInsets();
int x = in.left;
int y = in.top;
w = w - in.left - in.right;
h = h - in.top - in.bottom;
if (w >= 0 && h >= 0) {
Graphics2D g2 = (Graphics2D) g;
Paint pt = g2.getPaint();
g2.setPaint(ourPainter);
g2.fillRect(x, y, w, h);
g2.setPaint(pt);
}
}
}
}</source>
A panel that allows the user to select a date.
<source lang="java">
/*
* JCommon : a free general purpose class library for the Java(tm) platform * * * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors. * * Project Info: http://www.jfree.org/jcommon/index.html * * This library is free software; you can redistribute it and/or modify it * under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation; either version 2.1 of the License, or * (at your option) any later version. * * This library is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public * License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, * USA. * * [Java is a trademark or registered trademark of Sun Microsystems, Inc. * in the United States and other countries.] * * --------------------- * DateChooserPanel.java * --------------------- * (C) Copyright 2000-2004, by Object Refinery Limited. * * Original Author: David Gilbert (for Object Refinery Limited); * Contributor(s): -; * * $Id: DateChooserPanel.java,v 1.11 2007/11/02 17:50:36 taqua Exp $ * * Changes (from 26-Oct-2001) * -------------------------- * 26-Oct-2001 : Changed package to com.jrefinery.ui.* (DG); * 08-Dec-2001 : Dropped the getMonths() method (DG); * 13-Oct-2002 : Fixed errors reported by Checkstyle (DG); * 02-Nov-2005 : Fixed a bug where the current day-of-the-month is past * the end of the newly selected month when the month or year * combo boxes are changed - see bug id 1344319 (DG); * */
import java.awt.BorderLayout; import java.awt.Color; import java.awt.Font; import java.awt.GridLayout; import java.awt.Insets; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.text.DateFormatSymbols; import java.util.Calendar; import java.util.Date; import javax.swing.BorderFactory; import javax.swing.JButton; import javax.swing.JComboBox; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.SwingConstants; import javax.swing.UIManager; /**
* A panel that allows the user to select a date. * * @author David Gilbert */
public class DateChooserPanel extends JPanel implements ActionListener {
/**
* The date selected in the panel.
*/
private Calendar chosenDate;
/**
* The color for the selected date.
*/
private Color chosenDateButtonColor;
/**
* The color for dates in the current month.
*/
private Color chosenMonthButtonColor;
/**
* The color for dates that are visible, but not in the current month.
*/
private Color chosenOtherButtonColor;
/**
* The first day-of-the-week.
*/
private int firstDayOfWeek;
/**
* The range used for selecting years.
*/
private int yearSelectionRange = 20;
/**
* The font used to display the date.
*/
private Font dateFont = new Font("SansSerif", Font.PLAIN, 10);
/**
* A combo for selecting the month.
*/
private JComboBox monthSelector;
/**
* A combo for selecting the year.
*/
private JComboBox yearSelector;
/**
* A button for selecting today"s date.
*/
private JButton todayButton;
/**
* An array of buttons used to display the days-of-the-month.
*/
private JButton[] buttons;
/**
* A flag that indicates whether or not we are currently refreshing the
* buttons.
*/
private boolean refreshing = false;
/**
* The ordered set of all seven days of a week,
* beginning with the "firstDayOfWeek".
*/
private int[] WEEK_DAYS;
/**
* Constructs a new date chooser panel, using today"s date as the initial
* selection.
*/
public DateChooserPanel() {
this(Calendar.getInstance(), false);
}
/**
* Constructs a new date chooser panel.
*
* @param calendar the calendar controlling the date.
* @param controlPanel a flag that indicates whether or not the "today"
* button should appear on the panel.
*/
public DateChooserPanel(final Calendar calendar,
final boolean controlPanel) {
super(new BorderLayout());
this.chosenDateButtonColor = UIManager.getColor("textHighlight");
this.chosenMonthButtonColor = UIManager.getColor("control");
this.chosenOtherButtonColor = UIManager.getColor("controlShadow");
// the default date is today...
this.chosenDate = calendar;
this.firstDayOfWeek = calendar.getFirstDayOfWeek();
this.WEEK_DAYS = new int[7];
for (int i = 0; i < 7; i++) {
this.WEEK_DAYS[i] = ((this.firstDayOfWeek + i - 1) % 7) + 1;
}
add(constructSelectionPanel(), BorderLayout.NORTH);
add(getCalendarPanel(), BorderLayout.CENTER);
if (controlPanel) {
add(constructControlPanel(), BorderLayout.SOUTH);
}
setDate(calendar.getTime());
}
/**
* Sets the date chosen in the panel.
*
* @param theDate the new date.
*/
public void setDate(final Date theDate) {
this.chosenDate.setTime(theDate);
this.monthSelector.setSelectedIndex(this.chosenDate.get(
Calendar.MONTH));
refreshYearSelector();
refreshButtons();
}
/**
* Returns the date selected in the panel.
*
* @return the selected date.
*/
public Date getDate() {
return this.chosenDate.getTime();
}
/**
* Handles action-events from the date panel.
*
* @param e information about the event that occurred.
*/
public void actionPerformed(final ActionEvent e) {
if (e.getActionCommand().equals("monthSelectionChanged")) {
final JComboBox c = (JComboBox) e.getSource();
// In most cases, changing the month will not change the selected
// day. But if the selected day is 29, 30 or 31 and the newly
// selected month doesn"t have that many days, we revert to the
// last day of the newly selected month...
int dayOfMonth = this.chosenDate.get(Calendar.DAY_OF_MONTH);
this.chosenDate.set(Calendar.DAY_OF_MONTH, 1);
this.chosenDate.set(Calendar.MONTH, c.getSelectedIndex());
int maxDayOfMonth = this.chosenDate.getActualMaximum(
Calendar.DAY_OF_MONTH);
this.chosenDate.set(Calendar.DAY_OF_MONTH, Math.min(dayOfMonth,
maxDayOfMonth));
refreshButtons();
}
else if (e.getActionCommand().equals("yearSelectionChanged")) {
if (!this.refreshing) {
final JComboBox c = (JComboBox) e.getSource();
final Integer y = (Integer) c.getSelectedItem();
// in most cases, changing the year will not change the
// selected day. But if the selected day is Feb 29, and the
// newly selected year is not a leap year, we revert to
// Feb 28...
int dayOfMonth = this.chosenDate.get(Calendar.DAY_OF_MONTH);
this.chosenDate.set(Calendar.DAY_OF_MONTH, 1);
this.chosenDate.set(Calendar.YEAR, y.intValue());
int maxDayOfMonth = this.chosenDate.getActualMaximum(
Calendar.DAY_OF_MONTH);
this.chosenDate.set(Calendar.DAY_OF_MONTH, Math.min(dayOfMonth,
maxDayOfMonth));
refreshYearSelector();
refreshButtons();
}
}
else if (e.getActionCommand().equals("todayButtonClicked")) {
setDate(new Date());
}
else if (e.getActionCommand().equals("dateButtonClicked")) {
final JButton b = (JButton) e.getSource();
final int i = Integer.parseInt(b.getName());
final Calendar cal = getFirstVisibleDate();
cal.add(Calendar.DATE, i);
setDate(cal.getTime());
}
}
/**
* Returns a panel of buttons, each button representing a day in the month.
* This is a sub-component of the DatePanel.
*
* @return the panel.
*/
private JPanel getCalendarPanel() {
final JPanel p = new JPanel(new GridLayout(7, 7));
final DateFormatSymbols dateFormatSymbols = new DateFormatSymbols();
final String[] weekDays = dateFormatSymbols.getShortWeekdays();
for (int i = 0; i < this.WEEK_DAYS.length; i++) {
p.add(new JLabel(weekDays[this.WEEK_DAYS[i]],
SwingConstants.CENTER));
}
this.buttons = new JButton[42];
for (int i = 0; i < 42; i++) {
final JButton b = new JButton("");
b.setMargin(new Insets(1, 1, 1, 1));
b.setName(Integer.toString(i));
b.setFont(this.dateFont);
b.setFocusPainted(false);
b.setActionCommand("dateButtonClicked");
b.addActionListener(this);
this.buttons[i] = b;
p.add(b);
}
return p;
}
/**
* Returns the button color according to the specified date.
*
* @param theDate the date.
* @return the color.
*/
private Color getButtonColor(final Calendar theDate) {
if (equalDates(theDate, this.chosenDate)) {
return this.chosenDateButtonColor;
}
else if (theDate.get(Calendar.MONTH) == this.chosenDate.get(
Calendar.MONTH)) {
return this.chosenMonthButtonColor;
}
else {
return this.chosenOtherButtonColor;
}
}
/**
* Returns true if the two dates are equal (time of day is ignored).
*
* @param c1 the first date.
* @param c2 the second date.
* @return boolean.
*/
private boolean equalDates(final Calendar c1, final Calendar c2) {
if ((c1.get(Calendar.DATE) == c2.get(Calendar.DATE))
&& (c1.get(Calendar.MONTH) == c2.get(Calendar.MONTH))
&& (c1.get(Calendar.YEAR) == c2.get(Calendar.YEAR))) {
return true;
}
else {
return false;
}
}
/**
* Returns the first date that is visible in the grid. This should always
* be in the month preceding the month of the selected date.
*
* @return the date.
*/
private Calendar getFirstVisibleDate() {
final Calendar c = Calendar.getInstance();
c.set(this.chosenDate.get(Calendar.YEAR), this.chosenDate.get(
Calendar.MONTH), 1);
c.add(Calendar.DATE, -1);
while (c.get(Calendar.DAY_OF_WEEK) != getFirstDayOfWeek()) {
c.add(Calendar.DATE, -1);
}
return c;
}
/**
* Returns the first day of the week (controls the labels in the date
* panel).
*
* @return the first day of the week.
*/
private int getFirstDayOfWeek() {
return this.firstDayOfWeek;
}
/**
* Update the button labels and colors to reflect date selection.
*/
private void refreshButtons() {
final Calendar c = getFirstVisibleDate();
for (int i = 0; i < 42; i++) {
final JButton b = this.buttons[i];
b.setText(Integer.toString(c.get(Calendar.DATE)));
b.setBackground(getButtonColor(c));
c.add(Calendar.DATE, 1);
}
}
/**
* Changes the contents of the year selection JComboBox to reflect the
* chosen date and the year range.
*/
private void refreshYearSelector() {
if (!this.refreshing) {
this.refreshing = true;
this.yearSelector.removeAllItems();
final Integer[] years = getYears(this.chosenDate.get(
Calendar.YEAR));
for (int i = 0; i < years.length; i++) {
this.yearSelector.addItem(years[i]);
}
this.yearSelector.setSelectedItem(new Integer(this.chosenDate.get(
Calendar.YEAR)));
this.refreshing = false;
}
}
/**
* Returns a vector of years preceding and following the specified year.
* The number of years preceding and following is determined by the
* yearSelectionRange attribute.
*
* @param chosenYear the selected year.
* @return a vector of years.
*/
private Integer[] getYears(final int chosenYear) {
final int size = this.yearSelectionRange * 2 + 1;
final int start = chosenYear - this.yearSelectionRange;
final Integer[] years = new Integer[size];
for (int i = 0; i < size; i++) {
years[i] = new Integer(i + start);
}
return years;
}
/**
* Constructs a panel containing two JComboBoxes (for the month and year)
* and a button (to reset the date to TODAY).
*
* @return the panel.
*/
private JPanel constructSelectionPanel() {
final JPanel p = new JPanel();
final int minMonth = this.chosenDate.getMinimum(Calendar.MONTH);
final int maxMonth = this.chosenDate.getMaximum(Calendar.MONTH);
final String[] months = new String[maxMonth - minMonth + 1];
for(int i=0;i<months.length;i++){
months[i] = ""+i;
}
this.monthSelector = new JComboBox(months);
this.monthSelector.addActionListener(this);
this.monthSelector.setActionCommand("monthSelectionChanged");
p.add(this.monthSelector);
this.yearSelector = new JComboBox(getYears(0));
this.yearSelector.addActionListener(this);
this.yearSelector.setActionCommand("yearSelectionChanged");
p.add(this.yearSelector);
return p;
}
/**
* Returns a panel that appears at the bottom of the calendar panel -
* contains a button for selecting today"s date.
*
* @return the panel.
*/
private JPanel constructControlPanel() {
final JPanel p = new JPanel();
p.setBorder(BorderFactory.createEmptyBorder(2, 5, 2, 5));
this.todayButton = new JButton("Today");
this.todayButton.addActionListener(this);
this.todayButton.setActionCommand("todayButtonClicked");
p.add(this.todayButton);
return p;
}
/**
* Returns the color for the currently selected date.
*
* @return a color.
*/
public Color getChosenDateButtonColor() {
return this.chosenDateButtonColor;
}
/**
* Redefines the color for the currently selected date.
*
* @param chosenDateButtonColor the new color
*/
public void setChosenDateButtonColor(final Color chosenDateButtonColor) {
if (chosenDateButtonColor == null) {
throw new NullPointerException("UIColor must not be null.");
}
final Color oldValue = this.chosenDateButtonColor;
this.chosenDateButtonColor = chosenDateButtonColor;
refreshButtons();
firePropertyChange("chosenDateButtonColor", oldValue,
chosenDateButtonColor);
}
/**
* Returns the color for the buttons representing the current month.
*
* @return the color for the current month.
*/
public Color getChosenMonthButtonColor() {
return this.chosenMonthButtonColor;
}
/**
* Defines the color for the buttons representing the current month.
*
* @param chosenMonthButtonColor the color for the current month.
*/
public void setChosenMonthButtonColor(final Color chosenMonthButtonColor) {
if (chosenMonthButtonColor == null) {
throw new NullPointerException("UIColor must not be null.");
}
final Color oldValue = this.chosenMonthButtonColor;
this.chosenMonthButtonColor = chosenMonthButtonColor;
refreshButtons();
firePropertyChange("chosenMonthButtonColor", oldValue,
chosenMonthButtonColor);
}
/**
* Returns the color for the buttons representing the other months.
*
* @return a color.
*/
public Color getChosenOtherButtonColor() {
return this.chosenOtherButtonColor;
}
/**
* Redefines the color for the buttons representing the other months.
*
* @param chosenOtherButtonColor a color.
*/
public void setChosenOtherButtonColor(final Color chosenOtherButtonColor) {
if (chosenOtherButtonColor == null) {
throw new NullPointerException("UIColor must not be null.");
}
final Color oldValue = this.chosenOtherButtonColor;
this.chosenOtherButtonColor = chosenOtherButtonColor;
refreshButtons();
firePropertyChange("chosenOtherButtonColor", oldValue,
chosenOtherButtonColor);
}
/**
* Returns the range of years available for selection (defaults to 20).
*
* @return The range.
*/
public int getYearSelectionRange() {
return this.yearSelectionRange;
}
/**
* Sets the range of years available for selection.
*
* @param yearSelectionRange the range.
*/
public void setYearSelectionRange(final int yearSelectionRange) {
final int oldYearSelectionRange = this.yearSelectionRange;
this.yearSelectionRange = yearSelectionRange;
refreshYearSelector();
firePropertyChange("yearSelectionRange", oldYearSelectionRange,
yearSelectionRange);
}
}</source>
Customizing JPanel Look and Feel
Property StringObject TypePanel.backgroundColorPanel.borderBorderPanel.fontFontPanel.foregroundColorPanelUIString
Gradient Panel
<source lang="java">
/*
* soapUI, copyright (C) 2004-2009 eviware.ru * * soapUI is free software; you can redistribute it and/or modify it under the * terms of version 2.1 of the GNU Lesser General Public License as published by * the Free Software Foundation. * * soapUI is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without * even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. * See the GNU Lesser General Public License for more details at gnu.org. */
import java.awt.BorderLayout; import java.awt.Color; import java.awt.GradientPaint; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.LayoutManager; import java.awt.Paint; import javax.swing.JPanel; /**
* Created by IntelliJ IDEA. */
public class GradientPanel extends JPanel {
// ------------------------------ FIELDS ------------------------------
public final static int HORIZONTAL = 0;
public final static int VERTICAL = 1;
public final static int DIAGONAL_LEFT = 2;
public final static int DIAGONAL_RIGHT = 3;
private int direction = HORIZONTAL;
private boolean cyclic;
private int maxLength;
// --------------------------- CONSTRUCTORS ---------------------------
public GradientPanel()
{
this( HORIZONTAL );
}
public GradientPanel( int direction )
{
super( new BorderLayout() );
setOpaque( false );
this.direction = direction;
}
public GradientPanel( LayoutManager layoutManager )
{
super( layoutManager );
setOpaque( false );
this.direction = HORIZONTAL;
}
// --------------------- GETTER / SETTER METHODS ---------------------
public int getDirection()
{
return direction;
}
public void setDirection( int direction )
{
this.direction = direction;
}
public boolean isCyclic()
{
return cyclic;
}
public void setCyclic( boolean cyclic )
{
this.cyclic = cyclic;
}
public void setMaxLength( int maxLength )
{
this.maxLength = maxLength;
}
// -------------------------- OTHER METHODS --------------------------
public void paintComponent( Graphics g )
{
if( isOpaque() )
{
super.paintComponent( g );
return;
}
int width = getWidth();
int height = getHeight();
// Create the gradient paint
GradientPaint paint = null;
Color sc = getForeground();
Color ec = getBackground();
switch( direction )
{
case HORIZONTAL :
{
paint = new GradientPaint( 0, height / 2, sc, width, height / 2, ec, cyclic );
break;
}
case VERTICAL :
{
paint = new GradientPaint( width / 2, 0, sc, width / 2, maxLength > 0 ? maxLength : height, ec, cyclic );
break;
}
case DIAGONAL_LEFT :
{
paint = new GradientPaint( 0, 0, sc, width, height, ec, cyclic );
break;
}
case DIAGONAL_RIGHT :
{
paint = new GradientPaint( width, 0, sc, 0, height, ec, cyclic );
break;
}
}
if( paint == null )
{
throw new RuntimeException( "Invalid direction specified in GradientPanel" );
}
// we need to cast to Graphics2D for this operation
Graphics2D g2d = ( Graphics2D )g;
// save the old paint
Paint oldPaint = g2d.getPaint();
// set the paint to use for this operation
g2d.setPaint( paint );
// fill the background using the paint
g2d.fillRect( 0, 0, width, height );
// restore the original paint
g2d.setPaint( oldPaint );
super.paintComponent( g );
}
}</source>
Subclass JPanel
<source lang="java">
import java.awt.Color; import java.awt.Graphics; import java.awt.GridLayout; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; public class OvalPanel extends JPanel {
Color color;
public OvalPanel() {
this(Color.black);
}
public OvalPanel(Color color) {
this.color = color;
}
public void paintComponent(Graphics g) {
int width = getWidth();
int height = getHeight();
g.setColor(color);
g.drawOval(0, 0, width, height);
}
public static void main(String args[]) {
JFrame frame = new JFrame("Oval Sample");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new GridLayout(2, 2));
Color colors[] = { Color.RED, Color.BLUE, Color.GREEN, Color.YELLOW };
for (int i = 0; i < 4; i++) {
OvalPanel panel = new OvalPanel(colors[i]);
panel.add(new JButton("asdf"));
frame.add(panel);
}
frame.setSize(300, 200);
frame.setVisible(true);
}
}</source>
Using JPanel as a canvas
<source lang="java">
import java.awt.Color; import java.awt.Graphics; import javax.swing.JFrame; import javax.swing.JPanel; public class OvalPanelCanvas extends JPanel {
public OvalPanelCanvas() {
}
public void paintComponent(Graphics g) {
int width = getWidth();
int height = getHeight();
g.setColor(Color.black);
g.drawOval(0, 0, width, height);
}
public static void main(String args[]) {
JFrame frame = new JFrame("Oval Sample");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new OvalPanelCanvas());
frame.setSize(300, 200);
frame.setVisible(true);
}
}</source>
Using JPanel as a container
JPanel components are opaque, while JComponents are not opaque
<source lang="java">
import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; public class PanelWithComponents {
public static void main(String[] a) {
JPanel panel = new JPanel();
JButton okButton = new JButton("OK");
panel.add(okButton);
JButton cancelButton = new JButton("Cancel");
panel.add(cancelButton);
JFrame frame = new JFrame("Oval Sample");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(panel);
frame.setSize(300, 200);
frame.setVisible(true);
}
}</source>
