/* * Copyright (c) 1995 - 2008 Sun Microsystems, Inc.  All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * *   - Redistributions of source code must retain the above copyright *     notice, this list of conditions and the following disclaimer. * *   - Redistributions in binary form must reproduce the above copyright *     notice, this list of conditions and the following disclaimer in the *     documentation and/or other materials provided with the distribution. * *   - Neither the name of Sun Microsystems nor the names of its *     contributors may be used to endorse or promote products derived *     from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ package dnd;import javax.swing.*;import javax.swing.tree.*;import javax.swing.event.*;import java.awt.*;import java.awt.datatransfer.*;import java.awt.event.*;import java.io.*;public class LocationSensitiveDemo extends JFrame {    private DefaultListModel model = new DefaultListModel();    private int count = 0;    private JTree tree;    private JComboBox indicateCombo;    private DefaultTreeModel treeModel;    private TreePath namesPath;    private static DefaultTreeModel getDefaultTreeModel() {        DefaultMutableTreeNode root = new DefaultMutableTreeNode("things");        DefaultMutableTreeNode parent;        DefaultMutableTreeNode nparent;        parent = new DefaultMutableTreeNode("colors");        root.add(parent);        parent.add(new DefaultMutableTreeNode("red"));        parent.add(new DefaultMutableTreeNode("yellow"));        parent.add(new DefaultMutableTreeNode("green"));        parent.add(new DefaultMutableTreeNode("blue"));        parent.add(new DefaultMutableTreeNode("purple"));        parent = new DefaultMutableTreeNode("names");        root.add(parent);        nparent = new DefaultMutableTreeNode("men");        nparent.add(new DefaultMutableTreeNode("jack"));        nparent.add(new DefaultMutableTreeNode("kieran"));        nparent.add(new DefaultMutableTreeNode("william"));        nparent.add(new DefaultMutableTreeNode("jose"));                parent.add(nparent);        nparent = new DefaultMutableTreeNode("women");        nparent.add(new DefaultMutableTreeNode("jennifer"));        nparent.add(new DefaultMutableTreeNode("holly"));        nparent.add(new DefaultMutableTreeNode("danielle"));        nparent.add(new DefaultMutableTreeNode("tara"));        parent.add(nparent);        parent = new DefaultMutableTreeNode("sports");        root.add(parent);        parent.add(new DefaultMutableTreeNode("basketball"));        parent.add(new DefaultMutableTreeNode("soccer"));        parent.add(new DefaultMutableTreeNode("football"));        nparent = new DefaultMutableTreeNode("hockey");        parent.add(nparent);        nparent.add(new DefaultMutableTreeNode("ice hockey"));        nparent.add(new DefaultMutableTreeNode("roller hockey"));        nparent.add(new DefaultMutableTreeNode("floor hockey"));        nparent.add(new DefaultMutableTreeNode("road hockey"));        parent = new DefaultMutableTreeNode("food");        root.add(parent);        parent.add(new DefaultMutableTreeNode("pizza"));        parent.add(new DefaultMutableTreeNode("wings"));        parent.add(new DefaultMutableTreeNode("pasta"));        nparent = new DefaultMutableTreeNode("fruit");        parent.add(nparent);        nparent.add(new DefaultMutableTreeNode("bananas"));        nparent.add(new DefaultMutableTreeNode("apples"));        nparent.add(new DefaultMutableTreeNode("grapes"));        nparent.add(new DefaultMutableTreeNode("pears"));        return new DefaultTreeModel(root);    }    public LocationSensitiveDemo() {        super("Location Sensitive Drag and Drop Demo");        treeModel = getDefaultTreeModel();        tree = new JTree(treeModel);        tree.setBorder(BorderFactory.createEmptyBorder(2, 4, 2, 4));        tree.getSelectionModel().setSelectionMode(TreeSelectionModel.DISCONTIGUOUS_TREE_SELECTION);        tree.setDropMode(DropMode.ON);        namesPath = tree.getPathForRow(2);        tree.expandRow(2);        tree.expandRow(1);        tree.setRowHeight(0);        tree.setTransferHandler(new TransferHandler() {            public boolean canImport(TransferHandler.TransferSupport info) {                // for the demo, we'll only support drops (not clipboard paste)                if (!info.isDrop()) {                    return false;                }                String item = (String)indicateCombo.getSelectedItem();                                if (item.equals("Always")) {                    info.setShowDropLocation(true);                } else if (item.equals("Never")) {                    info.setShowDropLocation(false);                }                // we only import Strings                if (!info.isDataFlavorSupported(DataFlavor.stringFlavor)) {                    return false;                }                // fetch the drop location                JTree.DropLocation dl = (JTree.DropLocation)info.getDropLocation();                TreePath path = dl.getPath();                // we don't support invalid paths or descendants of the names folder                if (path == null || namesPath.isDescendant(path)) {                    return false;                }                return true;            }            public boolean importData(TransferHandler.TransferSupport info) {                // if we can't handle the import, say so                if (!canImport(info)) {                    return false;                }                // fetch the drop location                JTree.DropLocation dl = (JTree.DropLocation)info.getDropLocation();                                // fetch the path and child index from the drop location                TreePath path = dl.getPath();                int childIndex = dl.getChildIndex();                // fetch the data and bail if this fails                String data;                try {                    data = (String)info.getTransferable().getTransferData(DataFlavor.stringFlavor);                } catch (UnsupportedFlavorException e) {                    return false;                } catch (IOException e) {                    return false;                }                // if child index is -1, the drop was on top of the path, so we'll                // treat it as inserting at the end of that path's list of children                if (childIndex == -1) {                    childIndex = tree.getModel().getChildCount(path.getLastPathComponent());                }                // create a new node to represent the data and insert it into the model                DefaultMutableTreeNode newNode = new DefaultMutableTreeNode(data);                DefaultMutableTreeNode parentNode = (DefaultMutableTreeNode)path.getLastPathComponent();                treeModel.insertNodeInto(newNode, parentNode, childIndex);                // make the new node visible and scroll so that it's visible                tree.makeVisible(path.pathByAddingChild(newNode));                tree.scrollRectToVisible(tree.getPathBounds(path.pathByAddingChild(newNode)));                // demo stuff - remove for blog                model.removeAllElements();                model.insertElementAt("String " + (++count), 0);                // end demo stuff                return true;            }        });        JList dragFrom = new JList(model);        dragFrom.setFocusable(false);        dragFrom.setPrototypeCellValue("String 0123456789");        model.insertElementAt("String " + count, 0);        dragFrom.setDragEnabled(true);        dragFrom.setBorder(BorderFactory.createLoweredBevelBorder());        JPanel p = new JPanel();        p.setLayout(new BoxLayout(p, BoxLayout.X_AXIS));        JPanel wrap = new JPanel();        wrap.add(new JLabel("Drag from here:"));        wrap.add(dragFrom);        p.add(Box.createHorizontalStrut(4));        p.add(Box.createGlue());        p.add(wrap);        p.add(Box.createGlue());        p.add(Box.createHorizontalStrut(4));        getContentPane().add(p, BorderLayout.NORTH);        getContentPane().add(new JScrollPane(tree), BorderLayout.CENTER);        indicateCombo = new JComboBox(new String[] {"Default", "Always", "Never"});        indicateCombo.setSelectedItem("INSERT");        p = new JPanel();        p.setLayout(new BoxLayout(p, BoxLayout.X_AXIS));        wrap = new JPanel();        wrap.add(new JLabel("Show drop location:"));        wrap.add(indicateCombo);        p.add(Box.createHorizontalStrut(4));        p.add(Box.createGlue());        p.add(wrap);        p.add(Box.createGlue());        p.add(Box.createHorizontalStrut(4));        getContentPane().add(p, BorderLayout.SOUTH);        getContentPane().setPreferredSize(new Dimension(400, 450));    }    private static void increaseFont(String type) {        Font font = UIManager.getFont(type);        font = font.deriveFont(font.getSize() + 4f);        UIManager.put(type, font);    }    private static void createAndShowGUI() {        //Create and set up the window.        LocationSensitiveDemo test = new LocationSensitiveDemo();        test.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);                //Display the window.        test.pack();        test.setVisible(true);    }    public static void main(String[] args) {        SwingUtilities.invokeLater(new Runnable() {            public void run() {                                try {                    UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");                    increaseFont("Tree.font");                    increaseFont("Label.font");                    increaseFont("ComboBox.font");                    increaseFont("List.font");                } catch (Exception e) {}                //Turn off metal's use of bold fonts	        UIManager.put("swing.boldMetal", Boolean.FALSE);                createAndShowGUI();            }        });    }}