/**************************************************************************
* Copyright (c) 2001 by Punch Telematix. All rights reserved. *
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* 3. Neither the name of Punch Telematix nor the names of *
* other contributors may be used to endorse or promote products *
* derived from this software without specific prior written permission.*
* *
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED *
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**************************************************************************/
package com.acunia.wonka.test.awt.dnd;
import java.awt.TextField;
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.DropTarget;
import java.awt.dnd.DropTargetContext;
import java.awt.dnd.DropTargetDragEvent;
import java.awt.dnd.DropTargetDropEvent;
import java.awt.dnd.DropTargetEvent;
import java.awt.dnd.DropTargetListener;
import java.awt.dnd.InvalidDnDOperationException;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.StringBufferInputStream;
class DragDropText extends TextField implements Transferable, DragGestureListener,
DragSourceListener, DropTargetListener {
private static DataFlavor dataFlavors[] = new DataFlavor[] {createDataFlavor(), DataFlavor.plainTextFlavor, DataFlavor.stringFlavor };
private static DataFlavor createDataFlavor() {
try {
return new DataFlavor("text/plain; charset=iso8859-1", "String");
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
DragDropText(String txt) {
super(txt);
DragSource ds = DragSource.getDefaultDragSource();
ds.createDefaultDragGestureRecognizer(this,DnDConstants.ACTION_COPY, this);
setDropTarget(new DropTarget(this, this));
}
public void dragGestureRecognized(DragGestureEvent dge) {
try{dge.startDrag(null, this, null);}
catch(InvalidDnDOperationException idndoe){System.out.println("InvalidDnDOperationException: "+idndoe.getMessage());}
}
public void dragEnter(DragSourceDragEvent dsde) {
dsde.getDragSourceContext().setCursor(DragSource.DefaultCopyDrop);
}
public void dragOver(DragSourceDragEvent dsde) {
}
public void dragGestureChanged(DragSourceDragEvent dsde) {
}
public void dragExit(DragSourceEvent dse) {
dse.getDragSourceContext().setCursor(null);
}
public void dragDropEnd(DragSourceDropEvent dsde) {
Thread.dumpStack();
}
public void dropActionChanged(DragSourceDragEvent dsde) {
Thread.dumpStack();
}
public DataFlavor[] getTransferDataFlavors() {
return dataFlavors;
}
public boolean isDataFlavorSupported(DataFlavor df) {
for (int i = 0 ; i < dataFlavors.length; i++){
if (dataFlavors[i].equals(df)) return true;
}
return false;
}
public Object getTransferData(DataFlavor transferdf) throws
UnsupportedFlavorException, IOException {
if (!isDataFlavorSupported(transferdf)) throw new UnsupportedFlavorException(transferdf);
String originalText = getText();
if (DataFlavor.stringFlavor.equals(transferdf)) {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(baos);
try {
oos.writeObject(originalText);
} catch (Exception e) { throw new IOException(); }
return new ObjectInputStream(new ByteArrayInputStream(baos.toByteArray()));
} else {
StringBufferInputStream sbis = new StringBufferInputStream(originalText);
return sbis;
}
}
public void dragEnter(DropTargetDragEvent dtde) {
dtde.acceptDrag(DnDConstants.ACTION_COPY);
}
public void dragOver(DropTargetDragEvent dtde) {
dtde.acceptDrag(DnDConstants.ACTION_COPY);
}
public void dragExit(DropTargetEvent dtde) {
repaint();
}
public void drop(DropTargetDropEvent dtde) {
DropTargetContext dtc = dtde.getDropTargetContext();
boolean outcome = false;
if ((dtde.getSourceActions() & DnDConstants.ACTION_COPY) != 0)
dtde.acceptDrop(DnDConstants.ACTION_COPY);
else {
dtde.rejectDrop();
return;
}
DataFlavor[] dataflavors = dtde.getCurrentDataFlavors();
DataFlavor currentDataflavor = null;
for (int i = 0; i < dataflavors.length; i++) {
if (DataFlavor.plainTextFlavor.equals(dataflavors[i])) {
currentDataflavor = dataflavors[i];
break;
}
}
if (currentDataflavor != null) {
Transferable transf = dtde.getTransferable();
InputStream is = null;
try {
is = (InputStream)transf.getTransferData(currentDataflavor);
} catch (IOException ioe) {
ioe.printStackTrace();
dtc.dropComplete(false);
return;
} catch (UnsupportedFlavorException ufe) {
ufe.printStackTrace();
dtc.dropComplete(false);
repaint();
return;
}
if (is != null) {
String newText = getText();
try {
int length = is.available();
byte[] string = new byte[length];
is.read(string, 0, length);
for (int i = 0; i < length; i++){
if (string[i] == 0) {
length = i;
break;
}
}
newText = new String(string, 0, length);
outcome = true;
} catch (Exception e) {
e.printStackTrace();
dtc.dropComplete(false);
repaint();
return;
} finally {
setText(newText);
}
} else outcome = false;
}
repaint();
validate();
dtc.dropComplete(outcome);
}
public void dragScroll(DropTargetDragEvent dtde) {
}
public void dropActionChanged(DropTargetDragEvent dtde) {
}
}