/**
* $RCSfile: ,v $
* $Revision: $
* $Date: $
*
* Copyright (C) 2004-2011 Jive Software. All rights reserved.
*
* 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.
*/
package org.jivesoftware.spark.component;
import org.jivesoftware.spark.util.log.Log;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.awt.dnd.DnDConstants;
import java.awt.dnd.DragGestureEvent;
import java.awt.dnd.DragGestureListener;
import java.awt.dnd.DragSource;
import java.awt.dnd.DragSourceDragEvent;
import java.awt.dnd.DragSourceDropEvent;
import java.awt.dnd.DragSourceEvent;
import java.awt.dnd.DragSourceListener;
import java.awt.dnd.DropTargetDragEvent;
import java.awt.dnd.DropTargetDropEvent;
import java.awt.dnd.DropTargetEvent;
import java.awt.dnd.DropTargetListener;
import java.io.File;
import java.io.IOException;
import java.io.StringReader;
import java.util.Vector;
import javax.swing.JFrame;
import javax.swing.JLabel;
/**
* Allows for dragging of a file from the label to the desktop.
*/
public class FileDragLabel extends JLabel implements DropTargetListener, DragSourceListener, DragGestureListener {
private static final long serialVersionUID = -4814392353136597318L;
private final DragSource dragSource = DragSource.getDefaultDragSource();
private File file;
public FileDragLabel() {
dragSource.createDefaultDragGestureRecognizer(this, DnDConstants.ACTION_COPY, this);
}
public void setFile(File file) {
this.file = file;
}
public void dragDropEnd(DragSourceDropEvent DragSourceDropEvent) {
}
public void dragEnter(DragSourceDragEvent DragSourceDragEvent) {
}
public void dragExit(DragSourceEvent DragSourceEvent) {
}
public void dragOver(DragSourceDragEvent DragSourceDragEvent) {
}
public void dropActionChanged(DragSourceDragEvent DragSourceDragEvent) {
}
public void dragEnter(DropTargetDragEvent dropTargetDragEvent) {
dropTargetDragEvent.acceptDrag(DnDConstants.ACTION_COPY_OR_MOVE);
}
public void dragExit(DropTargetEvent dropTargetEvent) {
}
public void dragOver(DropTargetDragEvent dropTargetDragEvent) {
}
public void dropActionChanged(DropTargetDragEvent dropTargetDragEvent) {
}
public synchronized void drop(DropTargetDropEvent dropTargetDropEvent) {
try {
final Transferable transferable = dropTargetDropEvent.getTransferable();
if (transferable.isDataFlavorSupported(DataFlavor.javaFileListFlavor)) {
dropTargetDropEvent.acceptDrop(DnDConstants.ACTION_COPY);
dropTargetDropEvent.getDropTargetContext().dropComplete(true);
}
else {
dropTargetDropEvent.rejectDrop();
}
}
catch (Exception ex) {
Log.error(ex);
dropTargetDropEvent.rejectDrop();
}
}
public void dragGestureRecognized(DragGestureEvent dragGestureEvent) {
if (file == null) {
// Nothing selected, nothing to drag
getToolkit().beep();
}
else {
FileSelection transferable = new FileSelection(file);
dragGestureEvent.startDrag(DragSource.DefaultCopyDrop, transferable, this);
}
}
private class FileSelection extends Vector<File> implements Transferable {
private static final long serialVersionUID = -6310629361140258792L;
private final static int FILE = 0;
private final static int STRING = 1;
private final static int PLAIN = 2;
DataFlavor flavors[] = {DataFlavor.javaFileListFlavor,
DataFlavor.stringFlavor,
DataFlavor.getTextPlainUnicodeFlavor()};
public FileSelection(File file) {
addElement(file);
}
public synchronized DataFlavor[] getTransferDataFlavors() {
return flavors;
}
public boolean isDataFlavorSupported(DataFlavor flavor) {
boolean b = false;
b = b | flavor.equals(flavors[FILE]);
b |= flavor.equals(flavors[STRING]);
b |= flavor.equals(flavors[PLAIN]);
return (b);
}
public synchronized Object getTransferData(DataFlavor flavor)
throws UnsupportedFlavorException, IOException {
if (flavor.equals(flavors[FILE])) {
return this;
}
else if (flavor.equals(flavors[PLAIN])) {
return new StringReader(file.getAbsolutePath());
}
else if (flavor.equals(flavors[STRING])) {
return (file.getAbsolutePath());
}
else {
throw new UnsupportedFlavorException(flavor);
}
}
}
public static void main(String args[]) {
JFrame f = new JFrame();
FileDragLabel p = new FileDragLabel();
f.add(p);
f.setVisible(true);
}
}