/*
* Copyright (c) 2007 Timothy Wall, All Rights Reserved 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.
*/
package com.sun.jna.examples;
import java.awt.BorderLayout;
import java.awt.GraphicsConfiguration;
import java.awt.GraphicsEnvironment;
import java.awt.Image;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.Toolkit;
import java.awt.Window;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.image.ImageObserver;
import java.io.File;
import java.io.IOException;
import java.io.Reader;
import java.net.URL;
import java.util.Arrays;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.JWindow;
import javax.swing.SwingConstants;
import javax.swing.SwingUtilities;
import javax.swing.TransferHandler;
import javax.swing.UIManager;
import javax.swing.border.EmptyBorder;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import javax.swing.event.MouseInputAdapter;
// TODO: put this into a reasonable API; right now this is pretty much
// just hard-coded blitting of an image into a window
// Thanks to Rui Lopes for the C# example on which this is based:
// rui@ruilopes.com
// http://www.codeproject.com/cs/media/perpxalpha_sharp.asp?df=100&forumid=3270&exp=0&select=773155
public class AlphaMaskDemo2 implements Runnable {
private static final DataFlavor URL_FLAVOR = new DataFlavor("application/x-java-url; class=java.net.URL",
"URL");
private static final DataFlavor URI_LIST_FLAVOR = new DataFlavor("text/uri-list; class=java.lang.String",
"URI list");
private JFrame frame;
private JWindow alphaWindow;
private JLabel icon;
private ImageObserver observer = new ImageObserver() {
public boolean imageUpdate(final Image img, int infoflags, int x,
int y, int width, int height) {
if ((infoflags & (ImageObserver.ALLBITS | ImageObserver.FRAMEBITS)) != 0) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
setImage(img);
}
});
return false;
}
else if ((infoflags & (ImageObserver.ERROR | ImageObserver.ABORT)) != 0) {
System.err.println("Image load error: " + img);
return false;
}
return true;
}
};
private void setImage(final Image image) {
final int w = image.getWidth(observer);
final int h = image.getHeight(observer);
if (w > 0 && h > 0) {
frame.setIconImage(image);
icon.setIcon(new ImageIcon(image));
if (!alphaWindow.isVisible()) {
alphaWindow.pack();
alphaWindow.setVisible(true);
}
else {
alphaWindow.setSize(alphaWindow.getPreferredSize());
}
icon.getParent().invalidate();
icon.getParent().repaint();
}
}
public void run() {
// Must find a graphics configuration with a depth of 32 bits
GraphicsConfiguration gconfig = WindowUtils.getAlphaCompatibleGraphicsConfiguration();
frame = new JFrame("Alpha Mask Demo");
alphaWindow = new JWindow(frame, gconfig);
icon = new JLabel();
alphaWindow.getContentPane().add(icon);
JButton quit = new JButton("Quit");
JLabel label = new JLabel("Drag this window by its image");
label.setHorizontalAlignment(SwingConstants.CENTER);
alphaWindow.getContentPane().add(label, BorderLayout.NORTH);
alphaWindow.getContentPane().add(quit, BorderLayout.SOUTH);
quit.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
});
MouseInputAdapter handler = new MouseInputAdapter() {
private Point offset;
public void mousePressed(MouseEvent e) {
if (SwingUtilities.isLeftMouseButton(e))
offset = e.getPoint();
}
public void mouseReleased(MouseEvent e) {
offset = null;
}
public void mouseDragged(MouseEvent e) {
if (offset != null) {
Window w = (Window)e.getSource();
Point where = e.getPoint();
where.translate(-offset.x, -offset.y);
Point loc = w.getLocationOnScreen();
loc.translate(where.x, where.y);
w.setLocation(loc.x, loc.y);
}
}
};
alphaWindow.addMouseListener(handler);
alphaWindow.addMouseMotionListener(handler);
JPanel p = new JPanel(new BorderLayout(8, 8));
p.setBorder(new EmptyBorder(8, 8, 8, 8));
p.setTransferHandler(new TransferHandler() {
public boolean canImport(JComponent comp,
DataFlavor[] transferFlavors) {
List list = Arrays.asList(transferFlavors);
if (list.contains(URL_FLAVOR) || list.contains(URI_LIST_FLAVOR)
|| list.contains(DataFlavor.imageFlavor)
|| list.contains(DataFlavor.javaFileListFlavor)) {
return true;
}
if (DataFlavor.selectBestTextFlavor(transferFlavors) != null) {
return true;
}
System.err.println("No acceptable flavor found in "
+ Arrays.asList(transferFlavors));
return false;
}
public boolean importData(JComponent comp, Transferable t) {
try {
if (t.isDataFlavorSupported(URL_FLAVOR)) {
URL url = (URL)t.getTransferData(URL_FLAVOR);
setImage(Toolkit.getDefaultToolkit().getImage(url));
return true;
}
if (t.isDataFlavorSupported(URI_LIST_FLAVOR)) {
String s = (String)t.getTransferData(URI_LIST_FLAVOR);
String[] uris = s.split("[\r\n]");
if (uris.length > 0) {
URL url = new URL(uris[0]);
setImage(Toolkit.getDefaultToolkit().getImage(url));
return true;
}
return false;
}
if (t.isDataFlavorSupported(DataFlavor.imageFlavor)) {
Image image = (Image)t
.getTransferData(DataFlavor.imageFlavor);
setImage(image);
return true;
}
if (t.isDataFlavorSupported(DataFlavor.javaFileListFlavor)) {
List files = (List)t
.getTransferData(DataFlavor.javaFileListFlavor);
File f = (File)files.get(0);
URL url = new URL("file://"
+ f.toURI().toURL().getPath());
Image image = Toolkit.getDefaultToolkit().getImage(url);
setImage(image);
return true;
}
DataFlavor flavor = DataFlavor
.selectBestTextFlavor(t
.getTransferDataFlavors());
if (flavor != null) {
Reader reader = flavor.getReaderForText(t);
char[] buf = new char[512];
StringBuffer b = new StringBuffer();
int count;
// excise excess NUL characters (bug in firefox,
// java
// or my code, not sure which). someone got the
// encoding wrong
while ((count = reader.read(buf)) > 0) {
for (int i = 0; i < count; i++) {
if (buf[i] != 0)
b.append(buf, i, 1);
}
}
String html = b.toString();
Pattern p = Pattern
.compile(
"<img.*src=\"([^\\\"\">]+)\"",
Pattern.CANON_EQ
| Pattern.UNICODE_CASE);
Matcher m = p.matcher(html);
if (m.find()) {
URL url = new URL(m.group(1));
System.out.println("Load image from " + url);
Image image = Toolkit.getDefaultToolkit()
.getImage(url);
setImage(image);
return true;
}
System.err.println("Can't parse text: " + html);
return false;
}
System.err.println("No flavor available: "
+ Arrays.asList(t.getTransferDataFlavors()));
}
catch (UnsupportedFlavorException e) {
e.printStackTrace();
}
catch (IOException e) {
e.printStackTrace();
}
catch (Throwable e) {
e.printStackTrace();
}
return false;
}
});
p
.add(
new JLabel(
"<html><center>Drop an image with an alpha channel onto this window<br>"
+ "You may also adjust the overall transparency with the slider</center></html>"),
BorderLayout.NORTH);
final JSlider slider = new JSlider(0, 255, 255);
slider.addChangeListener(new ChangeListener() {
public void stateChanged(ChangeEvent e) {
int value = slider.getValue();
WindowUtils.setWindowAlpha(alphaWindow, value / 255f);
}
});
p.add(slider, BorderLayout.SOUTH);
frame.getContentPane().add(p);
frame.pack();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
centerOnScreen(frame);
frame.setVisible(true);
WindowUtils.setWindowTransparent(alphaWindow, true);
alphaWindow.setLocation(frame.getX() + frame.getWidth() + 4,
frame.getY());
try {
URL url = getClass().getResource("tardis.png");
if (url != null) {
setImage(Toolkit.getDefaultToolkit().getImage(url));
}
}
catch (Exception e) {
}
}
/** Center the given {@link Window} on the default screen. */
private static void centerOnScreen(Window window) {
Point center = GraphicsEnvironment.getLocalGraphicsEnvironment()
.getCenterPoint();
Rectangle max = GraphicsEnvironment.getLocalGraphicsEnvironment()
.getMaximumWindowBounds();
int x = Math.max(center.x - Math.round(window.getWidth() / 2f), max.x);
int y = Math.max(center.y - Math.round(window.getHeight() / 2f), max.y);
window.setLocation(new Point(x, y));
}
public static void main(String[] args) {
try {
System.setProperty("sun.java2d.noddraw", "true");
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
}
catch (Exception e) {
}
SwingUtilities.invokeLater(new AlphaMaskDemo2());
}
}