ClipboardTest Extends Frame Implements ClipboardOwner

package com.darwinsys;
 
/*
 * Copyright (c) Ian F. Darwin, http://www.darwinsys.com/, 1996-2002.
 * All rights reserved. Software written by Ian F. Darwin and others.
 * $Id: LICENSE,v 1.8 2004/02/09 03:33:38 ian Exp $
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
 * 
 * Java, the Duke mascot, and all variants of Sun's Java "steaming coffee
 * cup" logo are trademarks of Sun Microsystems. Sun's, and James Gosling's,
 * pioneering role in inventing and promulgating (and standardizing) the Java 
 * language and environment is gratefully acknowledged.
 * 
 * The pioneering role of Dennis Ritchie and Bjarne Stroustrup, of AT&T, for
 * inventing predecessor languages C and C++ is also gratefully acknowledged.
 */
 
import java.awt.Button;
import java.awt.Frame;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.TextArea;
import java.awt.datatransfer.Clipboard;
import java.awt.datatransfer.ClipboardOwner;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.StringSelection;
import java.awt.datatransfer.Transferable;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
 
/** Taken from the Sun documentation on Clipboard API */
public class ClipboardTest extends Frame implements ClipboardOwner, ActionListener {
 
    TextArea srcText, dstText;
 
    Button copyButton, pasteButton;
 
    Clipboard clipboard = getToolkit().getSystemClipboard();
 
    public ClipboardTest() {
	super("Clipboard Test");
	GridBagLayout gridbag = new GridBagLayout();
	GridBagConstraints c = new GridBagConstraints();
	setLayout(gridbag);
 
	srcText = new TextArea(8, 32);
	c.gridwidth = 2;
	c.anchor = GridBagConstraints.CENTER;
	gridbag.setConstraints(srcText, c);
	add(srcText);
 
	copyButton = new Button("Copy Above");
	copyButton.setActionCommand("copy");
	copyButton.addActionListener(this);
	c.gridy = 1;
	c.gridwidth = 1;
	gridbag.setConstraints(copyButton, c);
	add(copyButton);
 
	pasteButton = new Button("Paste Below");
	pasteButton.setActionCommand("paste");
	pasteButton.addActionListener(this);
	pasteButton.setEnabled(false);
	c.gridx = 1;
	gridbag.setConstraints(pasteButton, c);
	add(pasteButton);
 
	dstText = new TextArea(8, 32);
	c.gridx = 0;
	c.gridy = 2;
	c.gridwidth = 2;
	gridbag.setConstraints(dstText, c);
	add(dstText);
 
	pack();
    }
 
    public void actionPerformed(ActionEvent evt) {
	String cmd = evt.getActionCommand();
 
	if (cmd.equals("copy")) {
	    // Implement Copy operation
	    String srcData = srcText.getText();
	    if (srcData != null) {
		StringSelection contents = new StringSelection(srcData);
		clipboard.setContents(contents, this);
		pasteButton.setEnabled(true);
	    }
	} else if (cmd.equals("paste")) {
	    // Implement Paste operation
	    Transferable content = clipboard.getContents(this);
	    if (content != null) {
		try {
		    String dstData = (String) content.getTransferData(DataFlavor.stringFlavor);
		    dstText.append(dstData);
		} catch (Exception e) {
		    System.out.println("Couldn't get contents in format: " + DataFlavor.stringFlavor.getHumanPresentableName());
		}
	    }
	}
    }
 
    public void lostOwnership(Clipboard clipboard, Transferable contents) {
	System.out.println("Clipboard contents replaced");
    }
 
    public static void main(String[] args) {
	ClipboardTest test = new ClipboardTest();
	test.setVisible(true);
    }
}