TextTransferTest.java Source code

Introduction

Here is the source code for TextTransferTest.java

Source

/*
   This program is a part of the companion code for Core Java 8th ed.
   (http://horstmann.com/corejava)
    
   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.
    
   This program 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 for more details.
    
   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.Toolkit;
import java.awt.datatransfer.Clipboard;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.StringSelection;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.IOException;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;

/**
 * This program demonstrates the transfer of text between a Java application and the system
 * clipboard.
 * @version 1.13 2007-08-16
 * @author Cay Horstmann
 */
public class TextTransferTest {
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                JFrame frame = new TextTransferFrame();
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setVisible(true);
            }
        });
    }
}

/**
 * This frame has a text area and buttons for copying and pasting text.
 */
class TextTransferFrame extends JFrame {
    public TextTransferFrame() {
        setTitle("TextTransferTest");
        setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

        textArea = new JTextArea();
        add(new JScrollPane(textArea), BorderLayout.CENTER);
        JPanel panel = new JPanel();

        JButton copyButton = new JButton("Copy");
        panel.add(copyButton);
        copyButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent event) {
                copy();
            }
        });

        JButton pasteButton = new JButton("Paste");
        panel.add(pasteButton);
        pasteButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent event) {
                paste();
            }
        });

        add(panel, BorderLayout.SOUTH);
    }

    /**
     * Copies the selected text to the system clipboard.
     */
    private void copy() {
        Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
        String text = textArea.getSelectedText();
        if (text == null)
            text = textArea.getText();
        StringSelection selection = new StringSelection(text);
        clipboard.setContents(selection, null);
    }

    /**
     * Pastes the text from the system clipboard into the text area.
     */
    private void paste() {
        Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
        DataFlavor flavor = DataFlavor.stringFlavor;
        if (clipboard.isDataFlavorAvailable(flavor)) {
            try {
                String text = (String) clipboard.getData(flavor);
                textArea.replaceSelection(text);
            } catch (UnsupportedFlavorException e) {
                JOptionPane.showMessageDialog(this, e);
            } catch (IOException e) {
                JOptionPane.showMessageDialog(this, e);
            }
        }
    }

    private JTextArea textArea;

    private static final int DEFAULT_WIDTH = 300;
    private static final int DEFAULT_HEIGHT = 300;
}