Name: vi73552			Date: 03/04/99




I want to make a tree that accepts text dropped into it. I build 
and run my example app. I bring up the wordpad windows app, 
highlight some text and drag it into the tree in the jaja app.
An exception is thrown.

java.io.IOException: class java.awt.datatransfer.UnsupportedFlavorException:Plain Text caught while getting Data

	at java.awt.dnd.DropTargetContext$TransferableProxy.getTransferData(DropTargetContext.java:270)

	at TreePanel.drop(TreePanel.java:74)

	at java.awt.dnd.DropTarget.drop(DropTarget.java:343)

	at sun.awt.windows.WDropTargetContextPeer.processDropMessage(WDropTargetContextPeer.java:941)

	at sun.awt.windows.WDropTargetContextPeer.run(WDropTargetContextPeer.java:472)

	at javax.swing.SystemEventQueueUtilities.processRunnableEvent(SystemEventQueueUtilities.java:354)

	at javax.swing.SystemEventQueueUtilities.access$0(SystemEventQueueUtilities.java:350)

	at javax.swing.SystemEventQueueUtilities$RunnableTarget.processEvent(SystemEventQueueUtilities.java:391)

	at java.awt.Component.dispatchEventImpl(Component.java:2376)

	at java.awt.Component.dispatchEvent(Component.java:2289)

	at java.awt.EventQueue.dispatchEvent(EventQueue.java:258)

	at java.awt.EventDispatchThread.run(EventDispatchThread.java:68)


In my drop() method I have these two lines of code.

   if (trans.isDataFlavorSupported(DataFlavor.plainTextFlavor)) 
      obj = trans.getTransferData(DataFlavor.plainTextFlavor);

isDataFlavorSupported() returns true so I procede to getting the 
data. But getTransferData() throws an exception even though the
previous call just returned true.


Here's my complete example.
**************************************************************
import java.awt.event.*;
import javax.swing.*;
import java.awt.dnd.*;
import java.awt.datatransfer.*;
import java.awt.event.*;
import java.io.*;
	


public class TreePanel 
	implements ActionListener, DropTargetListener
{
	TreePanelUI view;
	JTree tree;
	DropTarget target;
	
	public TreePanel()
	{
		view = new TreePanelUI();
		tree = view.tree;
		view.closeButton.addActionListener(this);
		target = new DropTarget(tree, DnDConstants.ACTION_COPY, this);
		target.setActive (true);
	}
	
	JPanel getView()
	{ return view; }

	public void actionPerformed(ActionEvent evt)
	{
		if(evt.getActionCommand().equals("Close"))
			System.exit(0);
	}
	
	public void dragEnter (DropTargetDragEvent dtde) 
	{
		System.out.println ("dragEnter");
		DataFlavor df[] = dtde.getCurrentDataFlavors();
		if (dtde.isDataFlavorSupported(DataFlavor.plainTextFlavor))
	    	dtde.acceptDrag (DnDConstants.ACTION_COPY);
	 	else
			dtde.rejectDrag ();
	 }

	public void dropActionChanged(DropTargetDragEvent dtde)
	{ dragEnter(dtde); }
	
   	public  void dragOver (DropTargetDragEvent dtde) 
	{ System.out.println ("dragOver"); }

	public  void dragExit (DropTargetEvent dte) 
	{ System.out.println ("dragExit"); }

	public  void drop (DropTargetDropEvent dtde) 
	{
		dtde.acceptDrop (DnDConstants.ACTION_COPY);
	
	 	System.out.println ("dropped");
	
	 	Transferable trans = dtde.getTransferable();
	 	Object obj = null;
	
	 	try 
		{
	    	if (trans.isDataFlavorSupported(DataFlavor.plainTextFlavor)) 
            	obj = trans.getTransferData(DataFlavor.plainTextFlavor);
	     	
	     	System.out.println(obj);
			if (obj != null && obj instanceof InputStream) 
			{
	        	InputStream input = (InputStream) obj;
	         	StringBuffer str = new StringBuffer();
	         	byte[] buffer = new byte[64];
	         	int count = input.read(buffer);
	         	while (count != -1) 
				{
	            	str.append (new String (buffer, 0, count));
	             	count = input.read(buffer);
	         	}
	         	input.close();
	         	//text.setText (str.toString());
	     	}
		} catch (Exception e) { e.printStackTrace(); } 
		finally 
		{
	     	try { target.getDropTargetContext().dropComplete(true); } 
			catch (Exception ignore) {}
	 	}
	}
};

************************************************************
import javax.swing.*;
import java.awt.event.*;

public class TreeTest 
		implements ActionListener
{
	public static void main(String args[])
	{
	  System.out.println(System.getProperty("java.version"));
		JFrame frame = new JFrame("JDK 1.2");
		TreePanel panel = new TreePanel();
		frame.getContentPane().add(panel.getView());
		frame.setSize(300, 200);
		frame.show();
	}

  public void actionPerformed(ActionEvent e)    
  { System.exit(0); }
}
*********************************************************
import javax.swing.*;
import java.beans.*;
import java.awt.*;

public class TreePanelUI extends javax.swing.JPanel
{
	public TreePanelUI()
	{

		//{{INIT_CONTROLS
		setLayout(new BorderLayout(0,0));
		setSize(300,270);
		add("Center",JScrollPane1);
		JScrollPane1.setBounds(0,0,300,235);
		JScrollPane1.getViewport().add(tree);
		tree.setBounds(0,0,297,232);
		JPanel1.setLayout(new FlowLayout(FlowLayout.CENTER,5,5));
		add("South",JPanel1);
		JPanel1.setBounds(0,235,300,35);
		closeButton.setText("Close");
		JPanel1.add(closeButton);
		closeButton.setBounds(116,5,67,25);
		//}}

		//{{REGISTER_LISTENERS
		//}}
	}

	//{{DECLARE_CONTROLS
	javax.swing.JScrollPane JScrollPane1 = new javax.swing.JScrollPane();
	javax.swing.JTree tree = new javax.swing.JTree();
	javax.swing.JPanel JPanel1 = new javax.swing.JPanel();
	javax.swing.JButton closeButton = new javax.swing.JButton();
	//}}

}
(Review ID: 48238) 
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