Java Tutorial/Swing/Icon
Содержание
- 1 14. An empty icon with arbitrary width and height.
- 2 14. An icon for painting a square swatch of a specified Color.
- 3 14. Arrow Icon
- 4 14. Creates a transparent icon.
- 5 14. Creating an Icon(implement Icon interface)
- 6 14. Demonstrate the loading of image files into icons for use in a Swing user interface
- 7 14. implements Icon, SwingConstants
- 8 14. Layered Icon
- 9 14. State-Aware Icon Definition
14. An empty icon with arbitrary width and height.
<source lang="java">
/**
* @PROJECT.FULLNAME@ @VERSION@ License. * * Copyright @YEAR@ L2FProd.ru * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */
import java.awt.ruponent; import java.awt.Graphics; import javax.swing.Icon; /**
* An empty icon with arbitrary width and height. */
public final class EmptyIcon implements Icon {
private int width;
private int height;
public EmptyIcon() {
this(0, 0);
}
public EmptyIcon(int width, int height) {
this.width = width;
this.height = height;
}
public int getIconHeight() {
return height;
}
public int getIconWidth() {
return width;
}
public void paintIcon(Component c, Graphics g, int x, int y) {
}
}</source>
14. An icon for painting a square swatch of a specified Color.
<source lang="java">
/*
* ColorSwatch.java * 2007-03-03 */
//cb.aloe.decor; import java.awt.Color; import java.awt.ruponent; import java.awt.Graphics; import javax.swing.Icon; /**
* An icon for painting a square swatch of a specified Color. * * @author Christopher Bach */
public class ColorSwatch implements Icon {
private Color ourSwatchColor = Color.white;
private Color ourBorderColor = Color.black;
private boolean ourBorderPainted = true;
private boolean ourSwatchIsMultiColor = false;
private boolean ourSwatchIsVoid = false;
private int ourSwatchSize = 14;
/**
* Creates a standard 14 x 14 swatch with a black border and white background.
*/
public ColorSwatch() {
}
/**
* Creates a swatch of the specified size with a black border and white
* background.
*/
public ColorSwatch(int size) {
setSwatchSize(size);
}
/**
* Creates a swatch of the specified size with a black border and white
* background and determines whether or n not the border should be painted.
*/
public ColorSwatch(int size, boolean borderPainted) {
setSwatchSize(size);
setBorderPainted(borderPainted);
}
/**
*
*/
public ColorSwatch(Color color) {
setColor(color);
}
/**
*
*/
public ColorSwatch(int size, Color color) {
setSwatchSize(size);
setColor(color);
}
/**
*
*/
public ColorSwatch(int size, Color color, Color borderColor) {
setSwatchSize(size);
setColor(color);
setBorderColor(borderColor);
setBorderPainted(true);
}
/**
* Sets the size of this swatch.
*/
public void setSwatchSize(int size) {
if (size > 0)
ourSwatchSize = size;
else
ourSwatchSize = 14;
}
/**
* Returns the size of this swatch.
*/
public int getSwatchSize() {
return ourSwatchSize;
}
/**
* Determines whether or not this swatch"s border should be painted.
*/
public void setBorderPainted(boolean borderPainted) {
ourBorderPainted = borderPainted;
}
/**
* Returns whether or not this swatch"s border is painted.
*/
public boolean isBorderPainted() {
return ourBorderPainted;
}
/**
* Sets the color of this swatch"s border.
*/
public void setBorderColor(Color color) {
ourBorderColor = color;
}
/**
* Returns the color of this swatch"s border.
*/
public Color getBorderColor() {
return ourBorderColor;
}
/**
* Sets the color that this swatch represents.
*/
public void setColor(Color color) {
ourSwatchIsMultiColor = false;
ourSwatchColor = color;
}
/**
* Returns the color that this swatch represents.
*/
public Color getColor() {
return ourSwatchColor;
}
/**
* Sets this swatch to represent more than one color.
*/
public void setMultiColor() {
ourSwatchIsMultiColor = true;
}
/**
* Returns whether or not this swatch represents more than one color.
*/
public boolean isMultiColor() {
return ourSwatchIsMultiColor;
}
/**
* Determines whether or not this swatch is void. If the swatch is void, it
* will not be painted at all.
*/
public void setVoid(boolean isVoid) {
// When true, this icon will not be painted at all.
ourSwatchIsVoid = isVoid;
}
/**
* Returns whether this swatch is void. If the swatch is void, it will not be
* painted at all.
*/
public boolean isVoid() {
return ourSwatchIsVoid;
}
// // Icon implementation ////
/**
* Returns the width of this Icon.
*/
public int getIconWidth() {
return ourSwatchSize;
}
/**
* Returns the height of this Icon.
*/
public int getIconHeight() {
return ourSwatchSize;
}
/**
* Paints this Icon into the provided graphics context.
*/
public void paintIcon(Component c, Graphics g, int x, int y) {
if (ourSwatchIsVoid)
return;
Color oldColor = g.getColor();
if (ourSwatchIsMultiColor) {
g.setColor(Color.white);
g.fillRect(x, y, ourSwatchSize, ourSwatchSize);
g.setColor(ourBorderColor);
for (int i = 0; i < ourSwatchSize; i += 2) {
g.drawLine(x + i, y, x + i, y + ourSwatchSize);
}
}
else if (ourSwatchColor != null) {
g.setColor(ourSwatchColor);
g.fillRect(x, y, ourSwatchSize, ourSwatchSize);
}
else {
g.setColor(Color.white);
g.fillRect(x, y, ourSwatchSize, ourSwatchSize);
g.setColor(ourBorderColor);
g.drawLine(x, y, x + ourSwatchSize, y + ourSwatchSize);
g.drawLine(x, y + ourSwatchSize, x + ourSwatchSize, y);
}
if (ourBorderPainted) {
g.setColor(ourBorderColor);
g.drawRect(x, y, ourSwatchSize, ourSwatchSize);
}
g.setColor(oldColor);
}
}</source>
14. Arrow Icon
<source lang="java">
/*
* Copyright 2008 Sun Microsystems, Inc. All Rights Reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * - Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * - Neither the name of Sun Microsystems nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
import java.awt.Color; import java.awt.ruponent; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.GraphicsEnvironment; import java.awt.Image; import java.awt.Transparency; import java.awt.geom.AffineTransform; import java.awt.image.BufferedImage; import javax.swing.Icon; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.SwingConstants; import javax.swing.UIManager; /**
* * @author Administrator */
public class ArrowIcon implements Icon, SwingConstants {
private static final float DB = -.06f;
private int direction;
private int size;
private Color color;
private BufferedImage arrowImage;
public ArrowIcon(int direction) {
this(direction, 10, null);
}
public ArrowIcon(int direction, Color color) {
this(direction, 10, color);
}
public ArrowIcon(int direction, int size, Color color) {
this.size = size;
this.direction = direction;
this.color = color;
}
public int getIconHeight() {
return size;
}
public int getIconWidth() {
return size;
}
public void paintIcon(Component c, Graphics g, int x, int y) {
g.drawImage(getArrowImage(), x, y, c);
}
public static BufferedImage createTranslucentImage(int width, int height) {
return GraphicsEnvironment.getLocalGraphicsEnvironment().
getDefaultScreenDevice().getDefaultConfiguration().createCompatibleImage(width, height, Transparency.TRANSLUCENT);
}
protected Image getArrowImage() {
if (arrowImage == null) {
arrowImage = createTranslucentImage(size, size);
AffineTransform atx = direction != SOUTH? new AffineTransform() : null;
switch(direction ) {
case NORTH:
atx.setToRotation(Math.PI, size/2, size/2);
break;
case EAST:
atx.setToRotation(-(Math.PI/2), size/2, size/2);
break;
case WEST:
atx.setToRotation(Math.PI/2, size/2, size/2);
case SOUTH:
default:{ /* no xform*/ }
}
Graphics2D ig = (Graphics2D)arrowImage.getGraphics();
if (atx != null) {
ig.setTransform(atx);
}
int width = size;
int height = size/2 + 1;
int xx = (size - width)/2;
int yy = (size - height + 1)/2;
Color base = color != null? color : UIManager.getColor("controlDkShadow").darker();
paintArrow(ig, base, xx, yy);
paintArrowBevel(ig, base, xx, yy);
paintArrowBevel(ig, deriveColorHSB(base, 0f, 0f, .20f), xx, yy + 1);
}
return arrowImage;
}
protected void paintArrow(Graphics2D g, Color base, int x, int y) {
g.setColor(base);
/*
Path2D.Float arrowShape = new Path2D.Float();
arrowShape.moveTo(x, y-1);
System.out.println("moveTo "+(x)+","+(y-1));
arrowShape.lineTo(size-1, y-1);
System.out.println("lineTo "+(size-1)+","+(y-1));
arrowShape.lineTo(size/2, y+(size/2));
System.out.println("lineTo "+(size/2)+","+(y+(size/2)));
arrowShape.lineTo(size/2 - 1, y+(size/2));
System.out.println("lineTo "+ (size/2 - 1)+","+(y+(size/2)));
arrowShape.lineTo(x, y-1);
System.out.println("lineTo "+(x)+","+(y-1));
g.fill(arrowShape);
- /
int len = size - 2;
int xx = x;
int yy = y-1;
while (len >= 2) {
xx++;
yy++;
g.fillRect(xx, yy, len, 1);
len -= 2;
}
}
protected void paintArrowBevel(Graphics g, Color base, int x, int y) {
int len = size;
int xx = x;
int yy = y;
Color c2 = deriveColorHSB(base, 0f, 0f, (-DB)*(size/2));
while (len >= 2) {
c2 = deriveColorHSB(c2, 0f, 0f, DB);
g.setColor(c2);
g.fillRect(xx, yy, 1, 1);
g.fillRect(xx + len - 1, yy, 1, 1);
len -= 2;
xx++;
yy++;
}
}
/**
* Derives a color by adding the specified offsets to the base color"s
* hue, saturation, and brightness values. The resulting hue, saturation,
* and brightness values will be contrained to be between 0 and 1.
* @param base the color to which the HSV offsets will be added
* @param dH the offset for hue
* @param dS the offset for saturation
* @param dB the offset for brightness
* @return Color with modified HSV values
*/
public static Color deriveColorHSB(Color base, float dH, float dS, float dB) {
float hsb[] = Color.RGBtoHSB(
base.getRed(), base.getGreen(), base.getBlue(), null);
hsb[0] += dH;
hsb[1] += dS;
hsb[2] += dB;
return Color.getHSBColor(
hsb[0] < 0? 0 : (hsb[0] > 1? 1 : hsb[0]),
hsb[1] < 0? 0 : (hsb[1] > 1? 1 : hsb[1]),
hsb[2] < 0? 0 : (hsb[2] > 1? 1 : hsb[2]));
}
public static void main(String args[]) {
JFrame frame = new JFrame();
JPanel panel = new JPanel();
frame.add(panel);
panel.add(new JLabel("north", new ArrowIcon(ArrowIcon.NORTH), JLabel.CENTER));
panel.add(new JLabel("west", new ArrowIcon(ArrowIcon.WEST), JLabel.CENTER));
panel.add(new JLabel("south", new ArrowIcon(ArrowIcon.SOUTH), JLabel.CENTER));
panel.add(new JLabel("east", new ArrowIcon(ArrowIcon.EAST), JLabel.CENTER));
panel.add(new JLabel("east-20", new ArrowIcon(ArrowIcon.EAST, 20, Color.blue), JLabel.CENTER));
frame.pack();
frame.setVisible(true);
}
}</source>
14. Creates a transparent icon.
<source lang="java">
import java.awt.image.BufferedImage; import java.util.Arrays; import javax.swing.Icon; import javax.swing.ImageIcon;
public final class ImageUtils {
/**
* Creates a transparent image. These can be used for aligning menu items.
*
* @param width the width.
* @param height the height.
* @return the created transparent image.
*/
public static BufferedImage createTransparentImage (final int width, final int height)
{
return new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
}
/**
* Creates a transparent icon. The Icon can be used for aligning menu items.
*
* @param width the width of the new icon
* @param height the height of the new icon
* @return the created transparent icon.
*/
public static Icon createTransparentIcon (final int width, final int height)
{
return new ImageIcon(createTransparentImage(width, height));
}
}</source>
14. Creating an Icon(implement Icon interface)
<source lang="java">
import java.awt.Color; import java.awt.ruponent; import java.awt.Graphics; import java.awt.Polygon; import javax.swing.Icon; class DiamondIcon implements Icon {
public DiamondIcon() {
}
public int getIconHeight() {
return 20;
}
public int getIconWidth() {
return 20;
}
public void paintIcon(Component c, Graphics g, int x, int y) {
g.setColor(color);
g.drawRect(0,0,20,20);
}
}</source>
14. Demonstrate the loading of image files into icons for use in a Swing user interface
<source lang="java">
/*
* Copyright (c) 1995 - 2008 Sun Microsystems, Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * - Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * - Neither the name of Sun Microsystems nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
import java.awt.BasicStroke; import java.awt.BorderLayout; import java.awt.Color; import java.awt.ruponent; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.Image; import java.awt.RenderingHints; import java.awt.event.ActionEvent; import java.awt.image.BufferedImage; import java.util.List; import javax.swing.AbstractAction; import javax.swing.BorderFactory; import javax.swing.Box; import javax.swing.Icon; import javax.swing.ImageIcon; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JToolBar; import javax.swing.SwingUtilities; import javax.swing.SwingWorker; /**
* This application is intended to demonstrate the loading of image files into * icons for use in a Swing user interface. It creates a toolbar with a * thumbnail preview of each image. Clicking on the thumbnail will show the full * image in the main display area. * * IconDemoApp.java requires the following files:
* The following files are copyright 2006 spriggs.net and licensed under a * Creative Commons License (http://creativecommons.org/licenses/by-sa/3.0/) *
* images/sunw01.jpg
* images/sunw02.jpg
* images/sunw03.jpg
* images/sunw04.jpg
* images/sunw05.jpg
* * @author Collin Fagan * @date 7/25/2007 * @version 2.0 */
public class IconDemoApp extends JFrame {
private JLabel photographLabel = new JLabel();
private JToolBar buttonBar = new JToolBar();
private String imagedir = "images/";
private MissingIcon placeholderIcon = new MissingIcon();
/**
* List of all the descriptions of the image files. These correspond one to
* one with the image file names
*/
private String[] imageCaptions = { "Original SUNW Logo", "The Clocktower",
"Clocktower from the West", "The Mansion", "Sun Auditorium" };
/**
* List of all the image files to load.
*/
private String[] imageFileNames = { "sunw01.jpg", "sunw02.jpg", "sunw03.jpg",
"sunw04.jpg", "sunw05.jpg" };
/**
* Main entry point to the demo. Loads the Swing elements on the "Event
* Dispatch Thread".
*
* @param args
*/
public static void main(String args[]) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
IconDemoApp app = new IconDemoApp();
app.setVisible(true);
}
});
}
/**
* Default constructor for the demo.
*/
public IconDemoApp() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setTitle("Icon Demo: Please Select an Image");
// A label for displaying the pictures
photographLabel.setVerticalTextPosition(JLabel.BOTTOM);
photographLabel.setHorizontalTextPosition(JLabel.CENTER);
photographLabel.setHorizontalAlignment(JLabel.CENTER);
photographLabel.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
// We add two glue components. Later in process() we will add thumbnail
// buttons
// to the toolbar inbetween thease glue compoents. This will center the
// buttons in the toolbar.
buttonBar.add(Box.createGlue());
buttonBar.add(Box.createGlue());
add(buttonBar, BorderLayout.SOUTH);
add(photographLabel, BorderLayout.CENTER);
setSize(400, 300);
// this centers the frame on the screen
setLocationRelativeTo(null);
// start the image loading SwingWorker in a background thread
loadimages.execute();
}
/**
* SwingWorker class that loads the images a background thread and calls
* publish when a new one is ready to be displayed.
*
* We use Void as the first SwingWroker param as we do not need to return
* anything from doInBackground().
*/
private SwingWorker<Void, ThumbnailAction> loadimages = new SwingWorker<Void, ThumbnailAction>() {
/**
* Creates full size and thumbnail versions of the target image files.
*/
@Override
protected Void doInBackground() throws Exception {
for (int i = 0; i < imageCaptions.length; i++) {
ImageIcon icon;
icon = createImageIcon(imagedir + imageFileNames[i], imageCaptions[i]);
ThumbnailAction thumbAction;
if (icon != null) {
ImageIcon thumbnailIcon = new ImageIcon(getScaledImage(icon
.getImage(), 32, 32));
thumbAction = new ThumbnailAction(icon, thumbnailIcon,
imageCaptions[i]);
} else {
// the image failed to load for some reason
// so load a placeholder instead
thumbAction = new ThumbnailAction(placeholderIcon, placeholderIcon,
imageCaptions[i]);
}
publish(thumbAction);
}
// unfortunately we must return something, and only null is valid to
// return when the return type is void.
return null;
}
/**
* Process all loaded images.
*/
@Override
protected void process(List<ThumbnailAction> chunks) {
for (ThumbnailAction thumbAction : chunks) {
JButton thumbButton = new JButton(thumbAction);
// add the new button BEFORE the last glue
// this centers the buttons in the toolbar
buttonBar.add(thumbButton, buttonBar.getComponentCount() - 1);
}
}
};
/**
* Creates an ImageIcon if the path is valid.
*
* @param String -
* resource path
* @param String -
* description of the file
*/
protected ImageIcon createImageIcon(String path, String description) {
java.net.URL imgURL = getClass().getResource(path);
if (imgURL != null) {
return new ImageIcon(imgURL, description);
} else {
System.err.println("Couldn"t find file: " + path);
return null;
}
}
/**
* Resizes an image using a Graphics2D object backed by a BufferedImage.
*
* @param srcImg -
* source image to scale
* @param w -
* desired width
* @param h -
* desired height
* @return - the new resized image
*/
private Image getScaledImage(Image srcImg, int w, int h) {
BufferedImage resizedImg = new BufferedImage(w, h,
BufferedImage.TYPE_INT_RGB);
Graphics2D g2 = resizedImg.createGraphics();
g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
RenderingHints.VALUE_INTERPOLATION_BILINEAR);
g2.drawImage(srcImg, 0, 0, w, h, null);
g2.dispose();
return resizedImg;
}
/**
* Action class that shows the image specified in it"s constructor.
*/
private class ThumbnailAction extends AbstractAction {
/**
* The icon if the full image we want to display.
*/
private Icon displayPhoto;
/**
* @param Icon -
* The full size photo to show in the button.
* @param Icon -
* The thumbnail to show in the button.
* @param String -
* The descriptioon of the icon.
*/
public ThumbnailAction(Icon photo, Icon thumb, String desc) {
displayPhoto = photo;
// The short description becomes the tooltip of a button.
putValue(SHORT_DESCRIPTION, desc);
// The LARGE_ICON_KEY is the key for setting the
// icon when an Action is applied to a button.
putValue(LARGE_ICON_KEY, thumb);
}
/**
* Shows the full image in the main area and sets the application title.
*/
public void actionPerformed(ActionEvent e) {
photographLabel.setIcon(displayPhoto);
setTitle("Icon Demo: " + getValue(SHORT_DESCRIPTION).toString());
}
}
} /*
* Copyright (c) 1995 - 2008 Sun Microsystems, Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * - Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * - Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * - Neither the name of Sun Microsystems nor the names of its contributors may * be used to endorse or promote products derived from this software without * specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */
/**
* The "missing icon" is a white box with a black border and a red x. It"s used * to display something when there are issues loading an icon from an external * location. * * @author Collin Fagan * @date 7/25/2007 */
class MissingIcon implements Icon {
private int width = 32;
private int height = 32;
private BasicStroke stroke = new BasicStroke(4);
public void paintIcon(Component c, Graphics g, int x, int y) {
Graphics2D g2d = (Graphics2D) g.create();
g2d.setColor(Color.WHITE);
g2d.fillRect(x + 1, y + 1, width - 2, height - 2);
g2d.setColor(Color.BLACK);
g2d.drawRect(x + 1, y + 1, width - 2, height - 2);
g2d.setColor(Color.RED);
g2d.setStroke(stroke);
g2d.drawLine(x + 10, y + 10, x + width - 10, y + height - 10);
g2d.drawLine(x + 10, y + height - 10, x + width - 10, y + 10);
g2d.dispose();
}
public int getIconWidth() {
return width;
}
public int getIconHeight() {
return height;
}
}</source>
14. implements Icon, SwingConstants
<source lang="java">
/*
* Copyright (c) 1995 - 2008 Sun Microsystems, Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * - Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * - Neither the name of Sun Microsystems nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
import java.awt.Color; import java.awt.ruponent; import java.awt.Graphics; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.KeyEvent; import javax.swing.AbstractButton; import javax.swing.Icon; import javax.swing.ImageIcon; import javax.swing.JButton; import javax.swing.JComponent; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.SwingConstants; /*
* CustomIconDemo.java (based on ButtonDemo.java) requires the following files: * ArrowIcon.java images/middle.gif */
public class CustomIconDemo extends JPanel implements ActionListener {
protected JButton b1, b2, b3;
public CustomIconDemo() {
Icon leftButtonIcon = new ArrowIcon(SwingConstants.RIGHT);
Icon middleButtonIcon = createImageIcon("images/middle.gif",
"the middle button");
Icon rightButtonIcon = new ArrowIcon(SwingConstants.LEFT);
b1 = new JButton("Disable middle button", leftButtonIcon);
b1.setVerticalTextPosition(AbstractButton.CENTER);
b1.setHorizontalTextPosition(AbstractButton.LEADING);
b1.setMnemonic(KeyEvent.VK_D);
b1.setActionCommand("disable");
b2 = new JButton("Middle button", middleButtonIcon);
b2.setVerticalTextPosition(AbstractButton.BOTTOM);
b2.setHorizontalTextPosition(AbstractButton.CENTER);
b2.setMnemonic(KeyEvent.VK_M);
b3 = new JButton("Enable middle button", rightButtonIcon);
// Use the default text position of CENTER, TRAILING (RIGHT).
b3.setMnemonic(KeyEvent.VK_E);
b3.setActionCommand("enable");
b3.setEnabled(false);
// Listen for actions on buttons 1 and 3.
b1.addActionListener(this);
b3.addActionListener(this);
b1.setToolTipText("Click this button to disable the middle button.");
b2.setToolTipText("This middle button does nothing when you click it.");
b3.setToolTipText("Click this button to enable the middle button.");
// Add Components to this container, using the default FlowLayout.
add(b1);
add(b2);
add(b3);
}
public void actionPerformed(ActionEvent e) {
if ("disable".equals(e.getActionCommand())) {
b2.setEnabled(false);
b1.setEnabled(false);
b3.setEnabled(true);
} else {
b2.setEnabled(true);
b1.setEnabled(true);
b3.setEnabled(false);
}
}
/** Returns an ImageIcon, or null if the path was invalid. */
protected static ImageIcon createImageIcon(String path, String description) {
java.net.URL imgURL = CustomIconDemo.class.getResource(path);
if (imgURL != null) {
return new ImageIcon(imgURL, description);
} else {
System.err.println("Couldn"t find file: " + path);
return null;
}
}
/**
* Create the GUI and show it. For thread safety, this method should be
* invoked from the event-dispatching thread.
*/
private static void createAndShowGUI() {
// Create and set up the window.
JFrame frame = new JFrame("CustomIconDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// Set up the content pane.
JComponent newContentPane = new CustomIconDemo();
newContentPane.setOpaque(true); // content panes must be opaque
frame.setContentPane(newContentPane);
// Display the window.
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
// Schedule a job for the event-dispatching thread:
// creating and showing this application"s GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
} /*
* Copyright (c) 1995 - 2008 Sun Microsystems, Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * - Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * - Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * - Neither the name of Sun Microsystems nor the names of its contributors may * be used to endorse or promote products derived from this software without * specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */
/* This class is used by CustomIconDemo.java. */ class ArrowIcon implements Icon, SwingConstants {
private int width = 9;
private int height = 18;
private int[] xPoints = new int[4];
private int[] yPoints = new int[4];
public ArrowIcon(int direction) {
if (direction == LEADING) {
xPoints[0] = width;
yPoints[0] = -1;
xPoints[1] = width;
yPoints[1] = height;
xPoints[2] = 0;
yPoints[2] = height / 2;
xPoints[3] = 0;
yPoints[3] = height / 2 - 1;
} else /* direction == TRAILING */{
xPoints[0] = 0;
yPoints[0] = -1;
xPoints[1] = 0;
yPoints[1] = height;
xPoints[2] = width;
yPoints[2] = height / 2;
xPoints[3] = width;
yPoints[3] = height / 2 - 1;
}
}
public int getIconHeight() {
return height;
}
public int getIconWidth() {
return width;
}
public void paintIcon(Component c, Graphics g, int x, int y) {
if (c.isEnabled()) {
g.setColor(c.getForeground());
} else {
g.setColor(Color.gray);
}
g.translate(x, y);
g.fillPolygon(xPoints, yPoints, xPoints.length);
g.translate(-x, -y); // Restore graphics object
}
}</source>
14. Layered Icon
<source lang="java">
/*
* LayeredIcon.java * 2006-08-09 */
import java.awt.ruponent; import java.awt.Dimension; import java.awt.Graphics; import java.awt.Insets; import java.util.ArrayList; import javax.swing.Icon; import javax.swing.SwingConstants; /**
* @author Christopher Bach */
public class LayeredIcon implements Icon {
public static final int TOP = SwingConstants.TOP, LEFT = SwingConstants.LEFT,
BOTTOM = SwingConstants.BOTTOM, RIGHT = SwingConstants.RIGHT, CENTER = SwingConstants.CENTER;
private Dimension ourPrefSize = new Dimension(0, 0);
private ArrayList ourLayers = new ArrayList();
private Insets ourPadding = new Insets(0, 0, 0, 0);
/**
*
*/
public LayeredIcon() {
}
/**
*
*/
public LayeredIcon(int padding) {
setPadding(padding, padding, padding, padding);
}
/**
* Creates a new instance of LayeredIcon with the specified width and height,
* but no graphic.
*/
public LayeredIcon(int width, int height) {
setIconSize(width, height);
}
/**
*
*/
public LayeredIcon(int width, int height, int padding) {
setIconSize(width, height);
setPadding(padding, padding, padding, padding);
}
/**
*
*/
public LayeredIcon(int topPadding, int leftPadding, int bottomPadding, int rightPadding) {
setPadding(topPadding, leftPadding, bottomPadding, rightPadding);
}
/**
*
*/
public LayeredIcon(int width, int height, int topPadding, int leftPadding, int bottomPadding,
int rightPadding) {
setIconSize(width, height);
setPadding(topPadding, leftPadding, bottomPadding, rightPadding);
}
/**
* If any client Icons have been added and painting is enabled, paints the
* client Icons at the specified coordinates into the provided graphics
* context for the indicated Component.
*/
public void paintIcon(Component c, Graphics g, int x, int y) {
Dimension iconSize = getIconSize();
for (int i = 0, size = ourLayers.size(); i < size; i++) {
Layer layer = (Layer) ourLayers.get(i);
if (layer.painted) {
int w = layer.icon.getIconWidth();
int h = layer.icon.getIconHeight();
int dx = (layer.halign == LEFT ? 0 : iconSize.width - w);
if (layer.halign != RIGHT)
dx = dx / 2;
dx += ourPadding.left;
int dy = (layer.valign == TOP ? 0 : iconSize.height - h);
if (layer.valign != BOTTOM)
dy = dy / 2;
dy += ourPadding.top;
layer.icon.paintIcon(c, g, x + dx, y + dy);
}
}
}
/**
* Returns the width of the LayeredIcon. If any client Icons have been added,
* returns the max width of all client Icons. Otherwise, returns the
* LayeredIcon"s explicit width.
*/
public int getIconWidth() {
return getIconSize().width + ourPadding.left + ourPadding.right;
}
/**
* Returns the height of the LayeredIcon. If any client Icons have been added,
* returns the max height of all client Icons. Otherwise, returns the
* LayeredIcon"s explicit height.
*/
public int getIconHeight() {
return getIconSize().height + ourPadding.top + ourPadding.bottom;
}
/**
* Sets the explicit size of the LayeredIcon to be used when no client Icons
* have been added.
*/
public void setIconSize(int width, int height) {
ourPrefSize.width = width;
ourPrefSize.height = height;
}
/**
*
*/
public void setPadding(int padding) {
ourPadding.top = padding;
ourPadding.left = padding;
ourPadding.bottom = padding;
ourPadding.right = padding;
}
/**
*
*/
public void setPadding(int topPadding, int leftPadding, int bottomPadding, int rightPadding) {
ourPadding.top = topPadding;
ourPadding.left = leftPadding;
ourPadding.bottom = bottomPadding;
ourPadding.right = rightPadding;
}
/**
*
*/
public Insets getPadding() {
return new Insets(ourPadding.top, ourPadding.left, ourPadding.bottom, ourPadding.right);
}
/**
*
*/
public void addIcon(Icon icon) {
if (icon != null) {
ourLayers.add(new Layer(icon));
}
}
/**
*
*/
public void addIcon(Icon icon, int index) {
if (icon != null && index >= 0 && index <= ourLayers.size()) {
ourLayers.add(index, new Layer(icon));
}
}
/**
*
*/
public void addIcon(Icon icon, int halign, int valign) {
if (icon != null) {
ourLayers.add(new Layer(icon, checkHAlign(halign), checkVAlign(valign)));
}
}
/**
*
*/
public void addIcon(Icon icon, int index, int halign, int valign) {
if (icon != null && index >= 0 && index <= ourLayers.size()) {
ourLayers.add(index, new Layer(icon, checkHAlign(halign), checkVAlign(valign)));
}
}
/**
*
*/
public void removeIcon(Icon icon) {
Layer layer = getLayer(icon);
if (layer != null) {
ourLayers.remove(layer);
}
}
/**
*
*/
public void clear() {
ourLayers.clear();
}
/**
*
*/
public Icon getIcon(int index) {
Layer layer = (Layer) ourLayers.get(index);
if (layer != null)
return layer.icon;
else
return null;
}
/**
*
*/
public int indexOf(Icon icon) {
for (int i = 0, size = ourLayers.size(); i < size; i++) {
Layer layer = (Layer) ourLayers.get(i);
if (layer.icon == icon)
return i;
}
return -1;
}
/**
*
*/
public int iconCount() {
return ourLayers.size();
}
/**
*
*/
public boolean isIconPainted(int iconIndex) {
Layer layer = (Layer) ourLayers.get(iconIndex);
if (layer != null)
return layer.painted;
else
return false;
}
/**
*
*/
public void setIconPainted(int iconIndex, boolean painted) {
Layer layer = (Layer) ourLayers.get(iconIndex);
if (layer != null)
layer.painted = painted;
}
/**
*
*/
public boolean isIconPainted(Icon icon) {
Layer layer = getLayer(icon);
if (layer != null)
return layer.painted;
else
return false;
}
/**
*
*/
public void setIconPainted(Icon icon, boolean painted) {
Layer layer = getLayer(icon);
if (layer != null)
layer.painted = painted;
}
/**
*
*/
public void setIconAlignment(Icon icon, int halign, int valign) {
Layer layer = getLayer(icon);
if (layer != null) {
layer.halign = checkHAlign(halign);
layer.valign = checkVAlign(valign);
}
}
/**
*
*/
public void setIconAlignment(int iconIndex, int halign, int valign) {
Layer layer = (Layer) ourLayers.get(iconIndex);
if (layer != null) {
layer.halign = checkHAlign(halign);
layer.valign = checkVAlign(valign);
}
}
/**
*
*/
public int getIconHAlignment(Icon icon) {
Layer layer = getLayer(icon);
if (layer != null)
return layer.halign;
else
return CENTER;
}
/**
*
*/
public int getIconVAlignment(Icon icon) {
Layer layer = getLayer(icon);
if (layer != null)
return layer.valign;
else
return CENTER;
}
/**
*
*/
public int getIconHAlignment(int iconIndex) {
Layer layer = (Layer) ourLayers.get(iconIndex);
if (layer != null)
return layer.halign;
else
return CENTER;
}
/**
*
*/
public int getIconVAlignment(int iconIndex) {
Layer layer = (Layer) ourLayers.get(iconIndex);
if (layer != null)
return layer.valign;
else
return CENTER;
}
/**
*
*/
private int checkHAlign(int halign) {
if (halign != LEFT && halign != RIGHT && halign != CENTER)
return CENTER;
else
return halign;
}
/**
*
*/
private int checkVAlign(int valign) {
if (valign != TOP && valign != BOTTOM && valign != CENTER)
return CENTER;
else
return valign;
}
/**
*
*/
private Layer getLayer(Icon icon) {
for (int i = 0, size = ourLayers.size(); i < size; i++) {
Layer layer = (Layer) ourLayers.get(i);
if (layer.icon == icon)
return layer;
}
return null;
}
/**
*
*/
private Dimension getIconSize() {
if (ourLayers.size() == 0)
return ourPrefSize;
Dimension d = new Dimension(0, 0);
for (int i = 0, size = ourLayers.size(); i < size; i++) {
Layer layer = (Layer) ourLayers.get(i);
d.height = Math.max(d.height, layer.icon.getIconHeight());
d.width = Math.max(d.width, layer.icon.getIconWidth());
}
return d;
}
/**
*
*/
private class Layer {
public Icon icon = null;
public boolean painted = true;
public int halign = CENTER;
public int valign = CENTER;
public Layer() {
}
public Layer(Icon icon) {
this.icon = icon;
}
public Layer(Icon icon, int halign, int valign) {
this.icon = icon;
this.halign = halign;
this.valign = valign;
}
}
}</source>
14. State-Aware Icon Definition
<source lang="java">
import java.awt.Color; import java.awt.ruponent; import java.awt.Graphics; import javax.swing.AbstractButton; import javax.swing.Icon; import javax.swing.JCheckBox; import javax.swing.JFrame; class DiamondAbstractButtonStateIcon implements Icon {
public DiamondAbstractButtonStateIcon() {
}
public int getIconHeight() {
return 20;
}
public int getIconWidth() {
return 20;
}
public void paintIcon(Component component, Graphics g, int x, int y) {
if (component instanceof AbstractButton) {
AbstractButton abstractButton = (AbstractButton) component;
boolean selected = abstractButton.isSelected();
if (selected) {
g.setColor(Color.RED);
} else {
g.setColor(Color.BLUE);
}
g.drawRect(0, 0, 20, 20);
}
}
} public class DiamondAbstractButtonStateIconDemo {
public static void main(String[] a) {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JCheckBox bn = new JCheckBox("Click to change the icon color");
bn.setIcon(new DiamondAbstractButtonStateIcon());
frame.add(bn);
frame.setSize(300, 200);
frame.setVisible(true);
}
}</source>
