jdk/test/javax/swing/JTree/DnD/LastNodeLowerHalfDrop.java - platform/libcore - Git at Google

 /*
  * Copyright (c) 2015, 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.
  */

 /* @test
  * @bug 8129830 8132771
  * @summary JTree drag/drop on lower half of last child of container incorrect
  * @run main LastNodeLowerHalfDrop
  */

 import java.awt.Point;
 import java.awt.Rectangle;
 import java.awt.Robot;
 import java.awt.datatransfer.DataFlavor;
 import java.awt.datatransfer.Transferable;
 import java.awt.datatransfer.UnsupportedFlavorException;
 import java.awt.event.InputEvent;
 import java.util.ArrayList;
 import java.util.Enumeration;
 import java.util.List;
 import javax.swing.DropMode;
 import javax.swing.JComponent;
 import javax.swing.JFrame;
 import javax.swing.JScrollPane;
 import javax.swing.JTree;
 import javax.swing.SwingUtilities;
 import javax.swing.TransferHandler;
 import javax.swing.tree.DefaultMutableTreeNode;
 import javax.swing.tree.DefaultTreeModel;
 import javax.swing.tree.TreeModel;
 import javax.swing.tree.TreeNode;
 import javax.swing.tree.TreePath;
 import javax.swing.tree.TreeSelectionModel;

 public class LastNodeLowerHalfDrop {

     private static DefaultMutableTreeNode b1;
     private static DefaultMutableTreeNode b2;
     private static DefaultMutableTreeNode c;
     private static JTree jTree;
     private static DefaultMutableTreeNode a;
     private static DefaultMutableTreeNode b;
     private static DefaultMutableTreeNode a1;
     private static Point dragPoint;
     private static Point dropPoint;
     private static JFrame f;
     private static DefaultMutableTreeNode c1;
     private static DefaultMutableTreeNode root;


     public static void main(String[] args) throws Exception {
         SwingUtilities.invokeAndWait(new Runnable() {
             @Override
             public void run() {
                 f = new JFrame();
                 f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                 f.add(new LastNodeLowerHalfDrop().getContent());
                 f.setSize(400, 400);
                 f.setLocationRelativeTo(null);
                 f.setVisible(true);
             }
         });
         testCase(b2, a1, +0.4f);
         if (!"b2".equals(jTree.getModel().
                 getChild(a, a.getChildCount() - 1).toString())) {
             cleanUp();
             throw new RuntimeException("b1 was not inserted "
                     +"in the last position in a");
         }
         testCase(c1, c, -0.4f);
         if (!"c1".equals(jTree.getModel().getChild(root, 2).toString())) {
             cleanUp();
             throw new RuntimeException("c1 was not inserted "
                     +"between c and b nodes");
         }
         cleanUp();
     }

     private static void cleanUp() throws Exception {
         SwingUtilities.invokeAndWait(new Runnable() {
             @Override
             public void run() {
                 f.dispose();
             }
         });
     }

     private static void testCase(final DefaultMutableTreeNode drag,
             final DefaultMutableTreeNode drop, final float shift)
             throws Exception {
         Robot robot = new Robot();
         robot.waitForIdle();
         SwingUtilities.invokeAndWait(new Runnable() {
             @Override
             public void run() {
                 Rectangle rectDrag =
                         jTree.getPathBounds(new TreePath(drag.getPath()));
                 dragPoint = new Point((int)rectDrag.getCenterX(),
                         (int) rectDrag.getCenterY());
                 SwingUtilities.convertPointToScreen(dragPoint, jTree);
                 Rectangle rectDrop =
                         jTree.getPathBounds(new TreePath(drop.getPath()));
                 dropPoint = new Point(rectDrop.x + 5,
                         (int) (rectDrop.getCenterY() + shift * rectDrop.height));
                 SwingUtilities.convertPointToScreen(dropPoint, jTree);
             }
         });

         robot.mouseMove(dragPoint.x, dragPoint.y);
         robot.mousePress(InputEvent.BUTTON1_MASK);
         robot.delay(1000);
         robot.mouseMove(dropPoint.x, dropPoint.y);
         robot.delay(1000);
         robot.mouseRelease(InputEvent.BUTTON1_MASK);
         robot.delay(1000);
         robot.waitForIdle();
     }

     private JScrollPane getContent() {
         jTree = new JTree(getTreeModel());
         jTree.setRootVisible(false);
         jTree.setDragEnabled(true);
         jTree.setDropMode(DropMode.INSERT);
         jTree.setTransferHandler(new TreeTransferHandler());
         jTree.getSelectionModel().setSelectionMode(
                 TreeSelectionModel.SINGLE_TREE_SELECTION);
         expandTree(jTree);
         return new JScrollPane(jTree);
     }

     protected static TreeModel getTreeModel() {
         root = new DefaultMutableTreeNode("Root");

         a = new DefaultMutableTreeNode("A");
         root.add(a);
         a1 = new DefaultMutableTreeNode("a1");
         a.add(a1);

         b = new DefaultMutableTreeNode("B");
         root.add(b);
         b1 = new DefaultMutableTreeNode("b1");
         b.add(b1);
         b2 = new DefaultMutableTreeNode("b2");
         b.add(b2);

         c = new DefaultMutableTreeNode("C");
         root.add(c);
         c1 = new DefaultMutableTreeNode("c1");
         c.add(c1);
         return new DefaultTreeModel(root);
     }

     private void expandTree(JTree tree) {
         DefaultMutableTreeNode root = (DefaultMutableTreeNode) tree.getModel()
                 .getRoot();
         Enumeration e = root.breadthFirstEnumeration();
         while (e.hasMoreElements()) {
             DefaultMutableTreeNode node = (DefaultMutableTreeNode) e.nextElement();
             if (node.isLeaf()) {
                 continue;
             }
             int row = tree.getRowForPath(new TreePath(node.getPath()));
             tree.expandRow(row);
         }
     }
 }

 class TreeTransferHandler extends TransferHandler {
     DataFlavor nodesFlavor;
     DataFlavor[] flavors = new DataFlavor[1];
     DefaultMutableTreeNode[] nodesToRemove;

     public TreeTransferHandler() {
         try {
             String mimeType = DataFlavor.javaJVMLocalObjectMimeType
                     + ";class=\""
                     + javax.swing.tree.DefaultMutableTreeNode[].class.getName()
                     + "\"";
             nodesFlavor = new DataFlavor(mimeType);
             flavors[0] = nodesFlavor;
         } catch (ClassNotFoundException e) {
             System.out.println("ClassNotFound: " + e.getMessage());
         }
     }

     @Override
     public boolean canImport(TransferHandler.TransferSupport support) {
         if (!support.isDrop()) {
             return false;
         }
         support.setShowDropLocation(true);
         if (!support.isDataFlavorSupported(nodesFlavor)) {
             return false;
         }
         // Do not allow a drop on the drag source selections.
         JTree.DropLocation dl = (JTree.DropLocation) support.getDropLocation();
         JTree tree = (JTree) support.getComponent();
         int dropRow = tree.getRowForPath(dl.getPath());
         int[] selRows = tree.getSelectionRows();
         for (int i = 0; i < selRows.length; i++) {
             if (selRows[i] == dropRow) {
                 return false;
             }
         }
         // Do not allow MOVE-action drops if a non-leaf node is
         // selected unless all of its children are also selected.
         int action = support.getDropAction();
         if (action == MOVE) {
             return haveCompleteNode(tree);
         }
         // Do not allow a non-leaf node to be copied to a level
         // which is less than its source level.
         TreePath dest = dl.getPath();
         DefaultMutableTreeNode target = (DefaultMutableTreeNode)
                 dest.getLastPathComponent();
         TreePath path = tree.getPathForRow(selRows[0]);
         DefaultMutableTreeNode firstNode = (DefaultMutableTreeNode)
                 path.getLastPathComponent();
         if (firstNode.getChildCount() > 0
                 && target.getLevel() < firstNode.getLevel()) {
             return false;
         }
         return true;
     }

     private boolean haveCompleteNode(JTree tree) {
         int[] selRows = tree.getSelectionRows();
         TreePath path = tree.getPathForRow(selRows[0]);
         DefaultMutableTreeNode first = (DefaultMutableTreeNode)
                 path.getLastPathComponent();
         int childCount = first.getChildCount();
         // first has children and no children are selected.
         if (childCount > 0 && selRows.length == 1) {
             return false;
         }
         // first may have children.
         for (int i = 1; i < selRows.length; i++) {
             path = tree.getPathForRow(selRows[i]);
             DefaultMutableTreeNode next = (DefaultMutableTreeNode)
                     path.getLastPathComponent();
             if (first.isNodeChild(next)) {
                 // Found a child of first.
                 if (childCount > selRows.length - 1) {
                     // Not all children of first are selected.
                     return false;
                 }
             }
         }
         return true;
     }

     @Override
     protected Transferable createTransferable(JComponent c) {
         JTree tree = (JTree) c;
         TreePath[] paths = tree.getSelectionPaths();
         if (paths != null) {
             // Make up a node array of copies for transfer and
             // another for/of the nodes that will be removed in
             // exportDone after a successful drop.
             List<DefaultMutableTreeNode> copies = new ArrayList<>();
             List<DefaultMutableTreeNode> toRemove = new ArrayList<>();
             DefaultMutableTreeNode node = (DefaultMutableTreeNode)
                     paths[0].getLastPathComponent();
             DefaultMutableTreeNode copy = copy(node);
             copies.add(copy);
             toRemove.add(node);
             for (int i = 1; i < paths.length; i++) {
                 DefaultMutableTreeNode next = (DefaultMutableTreeNode) paths[i]
                         .getLastPathComponent();
                 // Do not allow higher level nodes to be added to list.
                 if (next.getLevel() < node.getLevel()) {
                     break;
                 } else if (next.getLevel() > node.getLevel()) {  // child node
                     copy.add(copy(next));
                     // node already contains child
                 } else {                                        // sibling
                     copies.add(copy(next));
                     toRemove.add(next);
                 }
             }
             DefaultMutableTreeNode[] nodes = copies
                     .toArray(new DefaultMutableTreeNode[copies.size()]);
             nodesToRemove = toRemove.toArray(
                     new DefaultMutableTreeNode[toRemove.size()]);
             return new NodesTransferable(nodes);
         }
         return null;
     }

     /**
      * Defensive copy used in createTransferable.
      */
     private DefaultMutableTreeNode copy(TreeNode node) {
         return new DefaultMutableTreeNode(node);
     }

     @Override
     protected void exportDone(JComponent source, Transferable data, int action) {
         if ((action & MOVE) == MOVE) {
             JTree tree = (JTree) source;
             DefaultTreeModel model = (DefaultTreeModel) tree.getModel();
             // Remove nodes saved in nodesToRemove in createTransferable.
             for (DefaultMutableTreeNode nodesToRemove1 : nodesToRemove) {
                 model.removeNodeFromParent(nodesToRemove1);
             }
         }
     }

     @Override
     public int getSourceActions(JComponent c) {
         return COPY_OR_MOVE;
     }

     @Override
     public boolean importData(TransferHandler.TransferSupport support) {
         if (!canImport(support)) {
             return false;
         }
         // Extract transfer data.
         DefaultMutableTreeNode[] nodes = null;
         try {
             Transferable t = support.getTransferable();
             nodes = (DefaultMutableTreeNode[]) t.getTransferData(nodesFlavor);
         } catch (UnsupportedFlavorException ufe) {
             System.out.println("UnsupportedFlavor: " + ufe.getMessage());
         } catch (java.io.IOException ioe) {
             System.out.println("I/O error: " + ioe.getMessage());
         }
         // Get drop location info.
         JTree.DropLocation dl = (JTree.DropLocation) support.getDropLocation();
         int childIndex = dl.getChildIndex();
         TreePath dest = dl.getPath();
         DefaultMutableTreeNode parent = (DefaultMutableTreeNode)
                 dest.getLastPathComponent();
         JTree tree = (JTree) support.getComponent();
         DefaultTreeModel model = (DefaultTreeModel) tree.getModel();
         // Configure for drop mode.
         int index = childIndex;    // DropMode.INSERT
         if (childIndex == -1) {     // DropMode.ON
             index = parent.getChildCount();
         }
         // Add data to model.
         for (DefaultMutableTreeNode node : nodes) {
             model.insertNodeInto(node, parent, index++);
         }
         return true;
     }

     @Override
     public String toString() {
         return getClass().getName();
     }

     public class NodesTransferable implements Transferable {
         DefaultMutableTreeNode[] nodes;

         public NodesTransferable(DefaultMutableTreeNode[] nodes) {
             this.nodes = nodes;
         }

         @Override
         public Object getTransferData(DataFlavor flavor)
                 throws UnsupportedFlavorException {
             if (!isDataFlavorSupported(flavor)) {
                 throw new UnsupportedFlavorException(flavor);
             }
             return nodes;
         }

         @Override
         public DataFlavor[] getTransferDataFlavors() {
             return flavors;
         }

         @Override
         public boolean isDataFlavorSupported(DataFlavor flavor) {
             return nodesFlavor.equals(flavor);
         }
     }
 }
	/*
	* Copyright (c) 2015, 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.
	*/

	/* @test
	* @bug 8129830 8132771
	* @summary JTree drag/drop on lower half of last child of container incorrect
	* @run main LastNodeLowerHalfDrop
	*/

	import java.awt.Point;
	import java.awt.Rectangle;
	import java.awt.Robot;
	import java.awt.datatransfer.DataFlavor;
	import java.awt.datatransfer.Transferable;
	import java.awt.datatransfer.UnsupportedFlavorException;
	import java.awt.event.InputEvent;
	import java.util.ArrayList;
	import java.util.Enumeration;
	import java.util.List;
	import javax.swing.DropMode;
	import javax.swing.JComponent;
	import javax.swing.JFrame;
	import javax.swing.JScrollPane;
	import javax.swing.JTree;
	import javax.swing.SwingUtilities;
	import javax.swing.TransferHandler;
	import javax.swing.tree.DefaultMutableTreeNode;
	import javax.swing.tree.DefaultTreeModel;
	import javax.swing.tree.TreeModel;
	import javax.swing.tree.TreeNode;
	import javax.swing.tree.TreePath;
	import javax.swing.tree.TreeSelectionModel;

	public class LastNodeLowerHalfDrop {

	private static DefaultMutableTreeNode b1;
	private static DefaultMutableTreeNode b2;
	private static DefaultMutableTreeNode c;
	private static JTree jTree;
	private static DefaultMutableTreeNode a;
	private static DefaultMutableTreeNode b;
	private static DefaultMutableTreeNode a1;
	private static Point dragPoint;
	private static Point dropPoint;
	private static JFrame f;
	private static DefaultMutableTreeNode c1;
	private static DefaultMutableTreeNode root;


	public static void main(String[] args) throws Exception {
	SwingUtilities.invokeAndWait(new Runnable() {
	@Override
	public void run() {
	f = new JFrame();
	f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	f.add(new LastNodeLowerHalfDrop().getContent());
	f.setSize(400, 400);
	f.setLocationRelativeTo(null);
	f.setVisible(true);
	}
	});
	testCase(b2, a1, +0.4f);
	if (!"b2".equals(jTree.getModel().
	getChild(a, a.getChildCount() - 1).toString())) {
	cleanUp();
	throw new RuntimeException("b1 was not inserted "
	+"in the last position in a");
	}
	testCase(c1, c, -0.4f);
	if (!"c1".equals(jTree.getModel().getChild(root, 2).toString())) {
	cleanUp();
	throw new RuntimeException("c1 was not inserted "
	+"between c and b nodes");
	}
	cleanUp();
	}

	private static void cleanUp() throws Exception {
	SwingUtilities.invokeAndWait(new Runnable() {
	@Override
	public void run() {
	f.dispose();
	}
	});
	}

	private static void testCase(final DefaultMutableTreeNode drag,
	final DefaultMutableTreeNode drop, final float shift)
	throws Exception {
	Robot robot = new Robot();
	robot.waitForIdle();
	SwingUtilities.invokeAndWait(new Runnable() {
	@Override
	public void run() {
	Rectangle rectDrag =
	jTree.getPathBounds(new TreePath(drag.getPath()));
	dragPoint = new Point((int)rectDrag.getCenterX(),
	(int) rectDrag.getCenterY());
	SwingUtilities.convertPointToScreen(dragPoint, jTree);
	Rectangle rectDrop =
	jTree.getPathBounds(new TreePath(drop.getPath()));
	dropPoint = new Point(rectDrop.x + 5,
	(int) (rectDrop.getCenterY() + shift * rectDrop.height));
	SwingUtilities.convertPointToScreen(dropPoint, jTree);
	}
	});

	robot.mouseMove(dragPoint.x, dragPoint.y);
	robot.mousePress(InputEvent.BUTTON1_MASK);
	robot.delay(1000);
	robot.mouseMove(dropPoint.x, dropPoint.y);
	robot.delay(1000);
	robot.mouseRelease(InputEvent.BUTTON1_MASK);
	robot.delay(1000);
	robot.waitForIdle();
	}

	private JScrollPane getContent() {
	jTree = new JTree(getTreeModel());
	jTree.setRootVisible(false);
	jTree.setDragEnabled(true);
	jTree.setDropMode(DropMode.INSERT);
	jTree.setTransferHandler(new TreeTransferHandler());
	jTree.getSelectionModel().setSelectionMode(
	TreeSelectionModel.SINGLE_TREE_SELECTION);
	expandTree(jTree);
	return new JScrollPane(jTree);
	}

	protected static TreeModel getTreeModel() {
	root = new DefaultMutableTreeNode("Root");

	a = new DefaultMutableTreeNode("A");
	root.add(a);
	a1 = new DefaultMutableTreeNode("a1");
	a.add(a1);

	b = new DefaultMutableTreeNode("B");
	root.add(b);
	b1 = new DefaultMutableTreeNode("b1");
	b.add(b1);
	b2 = new DefaultMutableTreeNode("b2");
	b.add(b2);

	c = new DefaultMutableTreeNode("C");
	root.add(c);
	c1 = new DefaultMutableTreeNode("c1");
	c.add(c1);
	return new DefaultTreeModel(root);
	}

	private void expandTree(JTree tree) {
	DefaultMutableTreeNode root = (DefaultMutableTreeNode) tree.getModel()
	.getRoot();
	Enumeration e = root.breadthFirstEnumeration();
	while (e.hasMoreElements()) {
	DefaultMutableTreeNode node = (DefaultMutableTreeNode) e.nextElement();
	if (node.isLeaf()) {
	continue;
	}
	int row = tree.getRowForPath(new TreePath(node.getPath()));
	tree.expandRow(row);
	}
	}
	}

	class TreeTransferHandler extends TransferHandler {
	DataFlavor nodesFlavor;
	DataFlavor[] flavors = new DataFlavor[1];
	DefaultMutableTreeNode[] nodesToRemove;

	public TreeTransferHandler() {
	try {
	String mimeType = DataFlavor.javaJVMLocalObjectMimeType
	+ ";class=\""
	+ javax.swing.tree.DefaultMutableTreeNode[].class.getName()
	+ "\"";
	nodesFlavor = new DataFlavor(mimeType);
	flavors[0] = nodesFlavor;
	} catch (ClassNotFoundException e) {
	System.out.println("ClassNotFound: " + e.getMessage());
	}
	}

	@Override
	public boolean canImport(TransferHandler.TransferSupport support) {
	if (!support.isDrop()) {
	return false;
	}
	support.setShowDropLocation(true);
	if (!support.isDataFlavorSupported(nodesFlavor)) {
	return false;
	}
	// Do not allow a drop on the drag source selections.
	JTree.DropLocation dl = (JTree.DropLocation) support.getDropLocation();
	JTree tree = (JTree) support.getComponent();
	int dropRow = tree.getRowForPath(dl.getPath());
	int[] selRows = tree.getSelectionRows();
	for (int i = 0; i < selRows.length; i++) {
	if (selRows[i] == dropRow) {
	return false;
	}
	}
	// Do not allow MOVE-action drops if a non-leaf node is
	// selected unless all of its children are also selected.
	int action = support.getDropAction();
	if (action == MOVE) {
	return haveCompleteNode(tree);
	}
	// Do not allow a non-leaf node to be copied to a level
	// which is less than its source level.
	TreePath dest = dl.getPath();
	DefaultMutableTreeNode target = (DefaultMutableTreeNode)
	dest.getLastPathComponent();
	TreePath path = tree.getPathForRow(selRows[0]);
	DefaultMutableTreeNode firstNode = (DefaultMutableTreeNode)
	path.getLastPathComponent();
	if (firstNode.getChildCount() > 0
	&& target.getLevel() < firstNode.getLevel()) {
	return false;
	}
	return true;
	}

	private boolean haveCompleteNode(JTree tree) {
	int[] selRows = tree.getSelectionRows();
	TreePath path = tree.getPathForRow(selRows[0]);
	DefaultMutableTreeNode first = (DefaultMutableTreeNode)
	path.getLastPathComponent();
	int childCount = first.getChildCount();
	// first has children and no children are selected.
	if (childCount > 0 && selRows.length == 1) {
	return false;
	}
	// first may have children.
	for (int i = 1; i < selRows.length; i++) {
	path = tree.getPathForRow(selRows[i]);
	DefaultMutableTreeNode next = (DefaultMutableTreeNode)
	path.getLastPathComponent();
	if (first.isNodeChild(next)) {
	// Found a child of first.
	if (childCount > selRows.length - 1) {
	// Not all children of first are selected.
	return false;
	}
	}
	}
	return true;
	}

	@Override
	protected Transferable createTransferable(JComponent c) {
	JTree tree = (JTree) c;
	TreePath[] paths = tree.getSelectionPaths();
	if (paths != null) {
	// Make up a node array of copies for transfer and
	// another for/of the nodes that will be removed in
	// exportDone after a successful drop.
	List<DefaultMutableTreeNode> copies = new ArrayList<>();
	List<DefaultMutableTreeNode> toRemove = new ArrayList<>();
	DefaultMutableTreeNode node = (DefaultMutableTreeNode)
	paths[0].getLastPathComponent();
	DefaultMutableTreeNode copy = copy(node);
	copies.add(copy);
	toRemove.add(node);
	for (int i = 1; i < paths.length; i++) {
	DefaultMutableTreeNode next = (DefaultMutableTreeNode) paths[i]
	.getLastPathComponent();
	// Do not allow higher level nodes to be added to list.
	if (next.getLevel() < node.getLevel()) {
	break;
	} else if (next.getLevel() > node.getLevel()) { // child node
	copy.add(copy(next));
	// node already contains child
	} else { // sibling
	copies.add(copy(next));
	toRemove.add(next);
	}
	}
	DefaultMutableTreeNode[] nodes = copies
	.toArray(new DefaultMutableTreeNode[copies.size()]);
	nodesToRemove = toRemove.toArray(
	new DefaultMutableTreeNode[toRemove.size()]);
	return new NodesTransferable(nodes);
	}
	return null;
	}

	/**
	* Defensive copy used in createTransferable.
	*/
	private DefaultMutableTreeNode copy(TreeNode node) {
	return new DefaultMutableTreeNode(node);
	}

	@Override
	protected void exportDone(JComponent source, Transferable data, int action) {
	if ((action & MOVE) == MOVE) {
	JTree tree = (JTree) source;
	DefaultTreeModel model = (DefaultTreeModel) tree.getModel();
	// Remove nodes saved in nodesToRemove in createTransferable.
	for (DefaultMutableTreeNode nodesToRemove1 : nodesToRemove) {
	model.removeNodeFromParent(nodesToRemove1);
	}
	}
	}

	@Override
	public int getSourceActions(JComponent c) {
	return COPY_OR_MOVE;
	}

	@Override
	public boolean importData(TransferHandler.TransferSupport support) {
	if (!canImport(support)) {
	return false;
	}
	// Extract transfer data.
	DefaultMutableTreeNode[] nodes = null;
	try {
	Transferable t = support.getTransferable();
	nodes = (DefaultMutableTreeNode[]) t.getTransferData(nodesFlavor);
	} catch (UnsupportedFlavorException ufe) {
	System.out.println("UnsupportedFlavor: " + ufe.getMessage());
	} catch (java.io.IOException ioe) {
	System.out.println("I/O error: " + ioe.getMessage());
	}
	// Get drop location info.
	JTree.DropLocation dl = (JTree.DropLocation) support.getDropLocation();
	int childIndex = dl.getChildIndex();
	TreePath dest = dl.getPath();
	DefaultMutableTreeNode parent = (DefaultMutableTreeNode)
	dest.getLastPathComponent();
	JTree tree = (JTree) support.getComponent();
	DefaultTreeModel model = (DefaultTreeModel) tree.getModel();
	// Configure for drop mode.
	int index = childIndex; // DropMode.INSERT
	if (childIndex == -1) { // DropMode.ON
	index = parent.getChildCount();
	}
	// Add data to model.
	for (DefaultMutableTreeNode node : nodes) {
	model.insertNodeInto(node, parent, index++);
	}
	return true;
	}

	@Override
	public String toString() {
	return getClass().getName();
	}

	public class NodesTransferable implements Transferable {
	DefaultMutableTreeNode[] nodes;

	public NodesTransferable(DefaultMutableTreeNode[] nodes) {
	this.nodes = nodes;
	}

	@Override
	public Object getTransferData(DataFlavor flavor)
	throws UnsupportedFlavorException {
	if (!isDataFlavorSupported(flavor)) {
	throw new UnsupportedFlavorException(flavor);
	}
	return nodes;
	}

	@Override
	public DataFlavor[] getTransferDataFlavors() {
	return flavors;
	}

	@Override
	public boolean isDataFlavorSupported(DataFlavor flavor) {
	return nodesFlavor.equals(flavor);
	}
	}
	}