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/*
Wotonomy: OpenStep design patterns for pure Java applications.
Copyright (C) 2000 Michael Powers
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, see http://www.gnu.org
*/
package net.wotonomy.ui.swing.util;
import java.awt.Component;
import java.awt.Image;
import java.awt.Window;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FilenameFilter;
import java.io.OutputStream;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JWindow;
/**
* WindowGrabber is a collection of static utility methods for taking screen
* shots of lightweight containers. All components that are not native peers
* will be drawn to a bitmap that will be run-length compressed (LZW encoding,
* GIF format) and written to the specified file or output stream. <br>
* <br>
*
* Any Swing/JFC or IFC window is a good candidate for use with these methods.
* The component is not expected to contain more than 256 colors (the maximum
* that GIF allows). While there is a color depth limitation, the compression is
* lossless, with no blurs or bleeding color.
*
* @author michael@mpowers.net
* @version $Revision: 904 $ $Date: 2006-02-18 18:19:05 -0500 (Sat, 18 Feb 2006)
* $
*/
public class WindowGrabber {
/**
* Captures the screen contents of the specified component, and write it to a
* file with the specified name.
*
* @param aComponent a lightweight component or container.
* @param aFileName the name of the file to write, optionally preceded by path.
* @return True if the file was successfully written, false if there was an
* error. Errors are written to the standard error stream.
*/
static public boolean grab(Component aComponent, String aFileName) {
OutputStream output = null;
try {
output = new FileOutputStream(aFileName);
} catch (Exception exc) {
System.err.println(exc);
return false;
}
return grab(aComponent, output);
}
/**
* Captures the screen contents of the specified component, and write it to a
* file with the specified name.
*
* @param aComponent a lightweight component or container.
* @param anOutputStream an output stream to which the image will be written.
* @return True if the image was successfully written, false if there was an
* error. Errors are written to the standard error stream.
*/
static public boolean grab(Component aComponent, OutputStream anOutputStream) {
Image img = aComponent.createImage(aComponent.getSize().width, aComponent.getSize().height);
aComponent.paintAll(img.getGraphics());
try {
GIFEncoder encoder = new GIFEncoder(img);
encoder.write(anOutputStream);
anOutputStream.flush();
} catch (Exception exc) {
System.err.println(exc);
return false;
}
return true;
}
protected static void processFilenames(String path, String[] filenames) {
ClassLoader loader = new ClassGrabber();
File f;
for (int i = 0; i < filenames.length; i++) {
try {
f = new File(path + filenames[i]);
if (f.isDirectory()) {
processFilenames(path + filenames[i] + "/", f.list(new FilenameFilter() {
public boolean accept(File dir, String name) {
return name.endsWith(".class");
}
}));
} else {
System.out.println("Loading " + filenames[i] + ": ");
Class c = loader.loadClass(path + filenames[i]);
System.out.println(c);
if (JWindow.class.isAssignableFrom(c) || JDialog.class.isAssignableFrom(c)
|| JFrame.class.isAssignableFrom(c)) {
try {
Window w = (Window) c.newInstance();
if (w.getBounds().width * w.getBounds().height == 0) { // if size not specified or set, pack
// it
w.pack();
}
String gifName = // replace .class with .gif
filenames[i].substring(0, filenames[i].length() - 5) + "gif";
w.addNotify();
w.repaint();
grab(w, gifName);
System.out.println("wrote: " + gifName);
} catch (Exception exc) {
System.err.println("WindowGrab failed for " + filenames[i] + ": ");
exc.printStackTrace();
}
} else {
System.out.println("not a JWindow, JDialog, or JFrame; ignored.");
}
}
} catch (Exception exc) {
System.err.println(filenames[i] + ": " + exc);
}
}
}
/**
* Captures images of any Swing window component classes specified as
* parameters. If created, image file will have the same name as the
* corresponding class file, but with a ".gif" extension.
*
* @param argv a list of filenames or directory names.
*/
public static void main(String[] argv) {
processFilenames("", argv);
System.exit(0);
}
}
/*
* $Log$ Revision 1.2 2006/02/18 23:19:05 cgruber Update imports and maven
* dependencies.
*
* Revision 1.1 2006/02/16 13:22:22 cgruber Check in all sources in
* eclipse-friendly maven-enabled packages.
*
* Revision 1.1.1.1 2000/12/21 15:51:49 mpowers Contributing wotonomy.
*
* Revision 1.2 2000/12/20 16:25:46 michael Added log to all files.
*
*
*/
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