This program demonstrates the transfer of text between a Java application and the system clipboard. : Clipboard « Development Class « Java

1. Java
2. Development Class
3. Clipboard

This program demonstrates the transfer of text between a Java application and the system clipboard.

   
/*
   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;
}

   
    
    
  

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