Mega Code Archive
Dropper - show File Drop Target from Drag-n-Drop
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/*
* Copyright (c) Ian F. Darwin, http://www.darwinsys.com/, 1996-2002.
* All rights reserved. Software written by Ian F. Darwin and others.
* $Id: LICENSE,v 1.8 2004/02/09 03:33:38 ian Exp $
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*
* Java, the Duke mascot, and all variants of Sun's Java "steaming coffee
* cup" logo are trademarks of Sun Microsystems. Sun's, and James Gosling's,
* pioneering role in inventing and promulgating (and standardizing) the Java
* language and environment is gratefully acknowledged.
*
* The pioneering role of Dennis Ritchie and Bjarne Stroustrup, of AT&T, for
* inventing predecessor languages C and C++ is also gratefully acknowledged.
*/
import java.awt.Toolkit;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.io.File;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Iterator;
import java.util.List;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.TransferHandler;
/**
* Dropper - show File Drop Target from Drag-n-Drop
*
* @version $Id: Dropper.java,v 1.1 2004/04/10 00:12:25 ian Exp $
*/
public class Dropper extends JFrame {
/**
* Construct trivial GUI and connect a TransferHandler to it.
*/
public Dropper() {
super("Drop Target");
JComponent cp = (JComponent) getContentPane();
cp.setTransferHandler(new MyFileTransferHandler()); // see below
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(150, 150);
}
/** Instantiate and show the GUI */
public static void main(String[] args) {
new Dropper().setVisible(true);
}
}
/** Non-public class to handle filename drops */
class MyFileTransferHandler extends TransferHandler {
/**
* @see javax.swing.TransferHandler#canImport(javax.swing.JComponent,
* java.awt.datatransfer.DataFlavor[])
*/
public boolean canImport(JComponent arg0, DataFlavor[] arg1) {
for (int i = 0; i < arg1.length; i++) {
DataFlavor flavor = arg1[i];
if (flavor.equals(DataFlavor.javaFileListFlavor)) {
System.out.println("canImport: JavaFileList FLAVOR: " + flavor);
return true;
}
if (flavor.equals(DataFlavor.stringFlavor)) {
System.out.println("canImport: String FLAVOR: " + flavor);
return true;
}
System.err.println("canImport: Rejected Flavor: " + flavor);
}
// Didn't find any that match, so:
return false;
}
/**
* Do the actual import.
*
* @see javax.swing.TransferHandler#importData(javax.swing.JComponent,
* java.awt.datatransfer.Transferable)
*/
public boolean importData(JComponent comp, Transferable t) {
DataFlavor[] flavors = t.getTransferDataFlavors();
System.out.println("Trying to import:" + t);
System.out.println("... which has " + flavors.length + " flavors.");
for (int i = 0; i < flavors.length; i++) {
DataFlavor flavor = flavors[i];
try {
if (flavor.equals(DataFlavor.javaFileListFlavor)) {
System.out.println("importData: FileListFlavor");
List l = (List) t
.getTransferData(DataFlavor.javaFileListFlavor);
Iterator iter = l.iterator();
while (iter.hasNext()) {
File file = (File) iter.next();
System.out.println("GOT FILE: "
+ file.getCanonicalPath());
// Now do something with the file...
}
return true;
} else if (flavor.equals(DataFlavor.stringFlavor)) {
System.out.println("importData: String Flavor");
String fileOrURL = (String) t.getTransferData(flavor);
System.out.println("GOT STRING: " + fileOrURL);
try {
URL url = new URL(fileOrURL);
System.out.println("Valid URL: " + url.toString());
// Do something with the contents...
return true;
} catch (MalformedURLException ex) {
System.err.println("Not a valid URL");
return false;
}
// now do something with the String.
} else {
System.out.println("importData rejected: " + flavor);
// Don't return; try next flavor.
}
} catch (IOException ex) {
System.err.println("IOError getting data: " + ex);
} catch (UnsupportedFlavorException e) {
System.err.println("Unsupported Flavor: " + e);
}
}
// If you get here, I didn't like the flavor.
Toolkit.getDefaultToolkit().beep();
return false;
}
}
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