/* * 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;/** * TextTransferHandler.java is used by the TextCutPaste.java example. */import java.io.*;import java.awt.*;import java.awt.event.*;import java.awt.datatransfer.*;import java.awt.dnd.*;import javax.swing.*;import javax.swing.text.*;/** * An implementation of TransferHandler that adds support for the * import and export of text using drag and drop and cut/copy/paste. */class TextTransferHandler extends TransferHandler {    //Start and end position in the source text.    //We need this information when performing a MOVE    //in order to remove the dragged text from the source.    Position p0 = null, p1 = null;    /**     * Perform the actual import.  This method supports both drag and     * drop and cut/copy/paste.     */    public boolean importData(TransferHandler.TransferSupport support) {        //If we can't handle the import, bail now.        if (!canImport(support)) {            return false;        }        //Fetch the data -- bail if this fails        String data;        try {            data = (String)support.getTransferable().getTransferData(DataFlavor.stringFlavor);        } catch (UnsupportedFlavorException e) {            return false;        } catch (java.io.IOException e) {            return false;        }        JTextField tc = (JTextField)support.getComponent();              tc.replaceSelection(data);        return true;    }        /**     * Bundle up the data for export.     */    protected Transferable createTransferable(JComponent c) {        JTextField source = (JTextField)c;        int start = source.getSelectionStart();        int end = source.getSelectionEnd();        Document doc = source.getDocument();        if (start == end) {            return null;        }        try {            p0 = doc.createPosition(start);            p1 = doc.createPosition(end);        } catch (BadLocationException e) {            System.out.println(                    "Can't create position - unable to remove text from source.");        }        String data = source.getSelectedText();        return new StringSelection(data);    }    /**     * These text fields handle both copy and move actions.     */    public int getSourceActions(JComponent c) {        return COPY_OR_MOVE;    }    /**     * When the export is complete, remove the old text if the action     * was a move.     */    protected void exportDone(JComponent c, Transferable data, int action) {        if (action != MOVE) {            return;        }                if ((p0 != null) && (p1 != null) &&            (p0.getOffset() != p1.getOffset())) {            try {                JTextComponent tc = (JTextComponent)c;                tc.getDocument().remove(p0.getOffset(),                         p1.getOffset() - p0.getOffset());            } catch (BadLocationException e) {                System.out.println("Can't remove text from source.");            }        }    }    /**     * We only support importing strings.     */    public boolean canImport(TransferHandler.TransferSupport support) {        // we only import Strings        if (!support.isDataFlavorSupported(DataFlavor.stringFlavor)) {            return false;        }        return true;    }}