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/*
* Copyright (c) 1999, 2024, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code 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 General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
import java.awt.Button;
import java.awt.Color;
import java.awt.Container;
import java.awt.Toolkit;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.awt.dnd.DnDConstants;
import java.awt.dnd.MouseDragGestureRecognizer;
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.InvalidDnDOperationException;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
class DnDSource extends Button implements Transferable,
DragGestureListener,
DragSourceListener {
private DataFlavor df;
private transient int dropAction;
DnDSource(String label) {
super(label);
Toolkit.getDefaultToolkit().createDragGestureRecognizer(MouseDragGestureRecognizer.class,
DragSource.getDefaultDragSource(),
this, DnDConstants.ACTION_COPY, this);
setBackground(Color.yellow);
setForeground(Color.blue);
df = new DataFlavor(DnDSource.class, "DnDSource");
}
public void dragGestureRecognized(DragGestureEvent dge) {
System.err.println("starting Drag");
try {
dge.startDrag(null, this, this);
} catch (InvalidDnDOperationException e) {
e.printStackTrace();
}
}
public void dragEnter(DragSourceDragEvent dsde) {
System.err.println("[Source] dragEnter");
dsde.getDragSourceContext().setCursor(DragSource.DefaultCopyDrop);
}
public void dragOver(DragSourceDragEvent dsde) {
System.err.println("[Source] dragOver");
dropAction = dsde.getDropAction();
System.out.println("dropAction = " + dropAction);
}
public void dragGestureChanged(DragSourceDragEvent dsde) {
System.err.println("[Source] dragGestureChanged");
dropAction = dsde.getDropAction();
System.out.println("dropAction = " + dropAction);
}
public void dragExit(DragSourceEvent dsde) {
System.err.println("[Source] dragExit");
dsde.getDragSourceContext().setCursor(null);
}
public void dragDropEnd(DragSourceDropEvent dsde) {
System.err.println("[Source] dragDropEnd");
}
public void dropActionChanged(DragSourceDragEvent dsde) {
System.err.println("[Source] dropActionChanged");
dropAction = dsde.getDropAction();
System.out.println("dropAction = " + dropAction);
}
public DataFlavor[] getTransferDataFlavors() {
return new DataFlavor[] {df};
}
public boolean isDataFlavorSupported(DataFlavor sdf) {
return df.equals(sdf);
}
public Object getTransferData(DataFlavor tdf) throws UnsupportedFlavorException, IOException {
Object copy = null;
if (!df.equals(tdf)) {
throw new UnsupportedFlavorException(tdf);
}
Container parent = getParent();
switch (dropAction) {
case DnDConstants.ACTION_COPY:
try {
copy = this.clone();
} catch (CloneNotSupportedException e) {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(baos);
oos.writeObject(this);
ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
ObjectInputStream ois = new ObjectInputStream(bais);
try {
copy = ois.readObject();
} catch (ClassNotFoundException cnfe) {
// do nothing
}
}
parent.add(this);
return copy;
case DnDConstants.ACTION_MOVE:
synchronized(this) {
if (parent != null) parent.remove(this);
}
return this;
case DnDConstants.ACTION_LINK:
return this;
default:
//throw new IOException("bad operation");
return this; // workaround for: 4135456 getDropAction() always return 0
}
}
}
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