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DragAndDropTest.java
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/*
* Author: Havard Rast Blok
* E-mail: 
* Web : www.rememberjava.com
*/
import java.awt.datatransfer.*;
import java.awt.dnd.*;
import java.io.Reader;
import javax.swing.*;
public class DragAndDropTest extends JFrame implements DropTargetListener
{
private JTextPane text;
private DropTarget target;
public DragAndDropTest()
{
//Initiate small GUI
setSize(400, 400 );
text = new JTextPane();
target = new DropTarget(text, this);
getContentPane().add( text );
show();
}
public void drop(DropTargetDropEvent dtde)
{
//Output some info
System.out.println("DragAndDropTest.drop dtde:"+dtde);
System.out.println("dtde.isLocalTransfer: "+dtde.isLocalTransfer());
System.out.println("dtde.getDropAction:"+dtde.getDropAction());
//Accepts the drop on this component,
//using the action ACTION_COPY to copy the text
dtde.acceptDrop( DnDConstants.ACTION_COPY ); //ACTION_COPY_OR_MOVE
//See what the drop object contains
DataFlavor df[] = dtde.getCurrentDataFlavors();
Transferable transf = dtde.getTransferable();
for(int i = 0; i < df.length; i++)
{
System.out.println("df "+i+": "+df[i]+", getRepresentationClass: "+df[i].getRepresentationClass());
}
System.out.println("transf: "+transf);
//Retreive the data from the drop
Object data = null;
Reader reader;
String str = "";
int read;
try
{
// only the first DataFlavor seems to contain interesting text
// (However, I would like some comments here)
data = transf.getTransferData( df[0] );
System.out.println("data: "+data);
reader = df[0].getReaderForText( transf );
//read the data one by one character
while( ( read = reader.read() ) != -1 )
{
str += (char)read;
}
}
catch(Exception e)
{
System.out.println("Error getting data: "+e);
}
//add the dropped string to the JTextPane
text.setText( text.getText() + "\n" + str );
//notify the source of the D&D action that the drop
//transfare actions are finished
dtde.dropComplete( true );
}
// These methods have to be included becaus they are part of
// the DropTargetListener interface.
public void dragEnter(DropTargetDragEvent dtde)
{
System.out.println("DragAndDropTest.dragEnter dtde:"+dtde);
}
public void dragExit(DropTargetEvent dte)
{
System.out.println("DragAndDropTest.dragExit dtde:"+dte);
}
public void dragOver(DropTargetDragEvent dtde)
{
System.out.println("DragAndDropTest.dragOver dtde:"+dtde);
}
public void dropActionChanged(DropTargetDragEvent dtde)
{
System.out.println("DragAndDropTest.dropActionChanged dtde:"+dtde);
}
public static void main( String [] args)
{
new DragAndDropTest();
}
}
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